s umt wm. ^ % : 05$ siU'J ed.\) ENCYCLOPAEDIA BRITANNICA Cncpclopartna Bntanmca: OR, A DICTIONARY OF ARTS, SCIENCES, AND MISCELLANEOUS LITERATURE; ENLARGED AND IMPROVED. THE SIXTH EDITION. SllusitrateU iuttf) neatly m ftuntrreti (Ditgrabings; VOL. XIV. INDOCTI DISCANT; AMENT MEMINISSE PERITI. EDINBURGH: PRINTED FOR ARCHIBALD CONSTABLE AND COMPANY; AND HURST, ROBINSON, AND COMPANY, 90, CHEAPSIDE, LONDON. 1823. > B ^ 15 # AF o./!3G6a ^oos- Encyclopedia Britannica. Micro- ecope. M1 M I € ICROSCOPE, an optical instrument, consisting of lenses, or mirrors, by means of which small objects appear larger than they do to the naked eye. Single microscopes consist of a single lens or mirror} or if more lenses or mirrors be made use ofy they only serve to throw light upon the object, but do not contribute to enlarge the image of it. Double or compound mi¬ croscopes are those in which the image of an object is . composed by means of more lenses or mirrors than one. For the principles on which the construction of mi¬ croscopes depends, see Optics. In the present article, it is intended to describe the finished instrument, with all its varied apparatus, according to the latest improve¬ ments ; and to illustrate by proper details its uses and importance. 1. Of Single Microscopes. The famous microscopes made use of by Mr Leeu- wenhoeck, were all, as Mr Baker assures us, of the single kind, and the construction of them was the most simple possible j each consisting only of a single lens set between two plates of silver, perforated with a small hole, with a moveable pin before it to place the object on and adjust it to the eye of the beholder. He informs us also, that lenses only, and not globules, were used in every one of these microscopes. plate I. The single microscope now most generally known eccxxxvii. and used is that called Wilson'1 s Docket Microscope. The I- body is made of brass, ivory, or silver, and is repre¬ sented by rAA, BB. GC is -a long fine threaded male screw that turns into the body of the microscope \ D a convex glass at the end of the screw. Two con¬ cave round pieces of thin brass, with holes of difterent diameters in the middle of them, are placed to cover the above-mentioned glass, arid thereby diminish the aperture when the greatest magnifiers are employed. EE, three thin plates of brass within the body of the microscope ; one of which is bent semicircularly in the middle, so as to form an arched cavity ftrr the recep¬ tion of a tube of glass, the use of the other two be¬ ing to receive and hold the sliders between them. F, a piece of wood or ivory, arched in the manner of the semicircular plate, and cemented to it. G, the other end of the body of the microscope, where a hol¬ low female screw is adapted to receive the difi'erent magnifiers. H is a spiral spring of steel, between Vol. XIV. Part I. f MIC the end G and the plates of brass, intended to keep Micm- the plates in a right position and counteract the long scope, screw CC. I is a small turned handle, for the better -v— holding of the instrument, to screw on or off at plea¬ sure. To this microscope belong six or seven magnifying glasses : six of them are set in silver, brass, or ivory, as in the figure K ; and marked I, 2, 3, 4, 5, 6, the lowest numbers being the greatest magnifiers. L is the seventh magnifier, set in the manner of a little barrel, to be held in the hand for the viewing of any larger object. M is a flat slip of ivory, called a slider, with four round holes through it, wherein to place objects between two pieces of glass or Muscovy talc, as they appear -At d d d d. Six such sliders, and one of brass, are usually sold with this microscope, some with objects placed in them, and others empty for viewing any thing that may offer: but whoever pleases to make a collection, may have as many as he desires. The brass slider is to confine any small object, that it may be viewed without crushing or destroying it. N is a tube of glass contrived to confine living ob¬ jects, such as frogs, fishes, &c. in order to discover tins circulation of the blood. All these are contained in a little neat box of fish-skin or mahogany, very convenient for carrying in the pocket. When an object is to be viewed, thrust the ivory slider, in which the said object is placed, between the two flat brass plates EE : observing always to put that side of the slider where the brass rings are far¬ thest from the eye. Then screw on the magnifying glass you intend to use, at the end of the instrument G j and looking through it against the light, turn the long screw GC, till your object be brought to suit your eye *, which will be known by its appearing perfectly distinckand clear. It is most proper to look at it first through a magnifier that can show the whole at once, and afterwards to inspect the several parts more parti¬ cularly with one of the greatest magnifiers j for thus you will gain a true idea of the whole, and of all its parts. And though the greatest magnifiers can show but a minute portion of any object at once, such as the claw of a flea, the horn of a louse, or the like ; yet by gently moving the slider which contains the object, the eye may gradually examine it all over. As objects must be brought very near the glasses when the greatest magnifiers are made use of, be care¬ ful not to scratch them by rubbing the slider against A them M I C [2 them as you move it in ov out. A few turns of the screw CC will easily prevent this mischief, by giving them room enough. You may change the objects in your sliders for any others you think proper, by taking out the brass rings with the point of a penknife the talcs will then fall out, if you but turn the sliders ; and after putting what you please between them, by replacing the brass rings you will fasten them as they were before. It is proper to have some sliders furnish¬ ed with talcs, but without any object between them, to be always in readiness for the examination of fluids, salts, sands, powders, the farina of flowers, or any other casual objects of such sort as need only be applied to the outside of the talc. The circulation of the blood may be easiest seen in the tails or fins of fishes, in the fine membranes be¬ tween a frog’s toes, or best of all in the tail of a water-newt. If your object be a small fish, place it within the tube N, and spread its tail or fin along the side thereof: if a frog, choose such a one as can but just be got into your tube ; and, with a pen, or small stick, expand the transparent membrane between the toes of the frog’s hind foot as much as you can. When your object is so adjusted that no part of it can inter¬ cept the light from the place you intend to view, un¬ screw the long screw CC, and thrust your tube into the arched cavity, quite through the body of the mi¬ croscope j then screw it to the true focal distance, and you will see the blood passing along its vessels with a rapid motion, and in a most surprising manner. The third or fourth magnifiers may be used for frogs or fishes : but for the tails of water-newts, the fifth or sixth will do 5 because the globules of their blood are twice as large as those of frogs or fish. The first or second magnifier cannot well be employed for this purpose j because the thickness of the tube in which the object lies, will scarce admit its being brought so near as the focal distance of the magni- fien An apparatus for the purpose of viewing opaque objects generally accompanies this microscope 5 and which consists of the following parts. A brass arm QR, which is screwed at Q, upon the body of the mi¬ croscope at G. Into the round hole R, any of the magnifiers suitable to the object to be viewed are to be screwed; and under it, in the same ring, the con¬ cave polished silver speculum S. Through a small aperture in the body of the microscope under the brass plates EE, is to slide the long wire with the forceps T: This wire is pointed at one of its ends*, and so, that either the points or forceps may be used for the objects as may be necessary. It is easy to conceive, therefore, that the arm at R, which turns by a twofold joint at a and 6, may be brought ivith its magnifier over the object, the light reflected upon it by the application of the speculum, and the true focus obtained by turning of the male screw CC as before directed.—As objects are sometimes not well fixed for view, either by the forceps or point, the small piece shown at V is added, and in such cases answers better : it screws over the point of T \ it con¬ tains a small round piece of ivory, blackened on one side, and left white upon the other as a contrast to coloured objects, and by a small piece of watch-spring fastens down the objects upon the ivory. 3 ] MIC 2. Single Microscope by reflection. In fig. 2. A is a 5 scroll of ^ brass fixed upright upon a round wooden base B, or a mahogany drawer or case, so as to stand perfectly firm and steady. C is a brass screw, that pas¬ ses through a hole in the upper limb of the scioll in¬ to the side of the microscope 13, and screws it fast to the said scroll. E is a concave speculum set in a box of brass, which hangs in the arch G by two small screws ffl that screw into the opposite sides thereof. At the bottom ol this arch is a pm of the same metal, exactly fitted to a hole h in the vvoouen pedestal, made for the reception of the pin. As the arch turns on this pin, and the speculum turns on the end of the arch, it may, by this twofold motion, be easily adjust¬ ed in such a manner aS to reflect the light of the sun, of the sky, or of a candle, directly upwards through the microscope that is fixed perpendicularly over it} and by so doing may be made to answer many pur¬ poses of the large double reflecting microscope. The body of the microscope may also be fixed horizon¬ tally, and objects viewed in that position by any light you choose ; which is an advantage the common double reflecting microscope has not. It may also be render¬ ed further useful by means of a slip of glass; one end of which being thrust through between the plates where the sliders go, and the other extending to some distance, such objects may be placed thereon as cannot be ap¬ plied in the sliders : anti then, having a limb of brass that may fasten to the body of the microscope, and ex¬ tend over the projecting glass a hollow ring wherein to screw the magnifiers, all sorts of subjects may be examined with great convenience, it a hole be made in the pedestal, to place the speculum exactly underneath, and thereby throw up the rays of light. I lie pocket- microscope, thus mounted, says Mr Baker, “ is as easy and pleasant in its use \ as fit for the most curious ex¬ amination of the animalcules and salts in fluids, of the farinas in vegetables, and of the circulation in small animals} in short, is as likely to make considerable discoveries in objects, that have some degree of trans¬ parency, as any microscope I have ever seen or heard of.” The brass scroll A is now generally made to un¬ screw into three parts, and pack with the microscope and apparatus into the drawer of a mahogany pocketr case, upon the lid of which the scroll is made to fix when in use. The opaque apparatus also, as above described, is applicable this ivay by reflection. It only consists in turning the arm R (fig. lO* with the magnifier over the concave speculum below (fig. 2.), or to receive the light as reflected obliquely from it : the silver sper culum screwed into R will then reflect the light, which it receives from the glass speculum, strongly upon the object that is applied upon the wire ’I underneath. This miscroscope, however, is not upon the most convenient construction, in comparison with others now made: it has been esteemed for many years past from its popular name, and recommendation by its makers. Its portability is certainly a great advantage in its fa¬ vour ; but in most respects it is superseded by the, mi¬ croscopes hereafter described. 3. Microscope for Opaque Objects, called the Single fi Opaque Microscope. This microscope remedies the in¬ convenience of having the. dark side, of an object ne>r,t MIC [ 3 ] MIC MScro- the eye, which formerly was an insurmountable ob- pc. jection to the making observations on opaque objects " .r——* wi^jj rtrjy considerable degree of exactness or satisfac¬ tion : for, in ail other contrivances commonly known, the nearness of the instrument to the object (when glasses that magnify much are used) unavoidably over¬ shadows it so much, that its appearance is rendered ob¬ scure and indistinct. And, notwithstanding ways have been tried to point light upon an object, from the sun or a candle, by a convex glass placed on the side there¬ of, the rays from either can be thrown upon it in such an acute angle only, that they serve to give a confused glare, but are insufficient to afford a clear and perfect yiew of the object. But in this microscope, by means of a concave speculum of silver highly polished, in whoso centre a magnifying lens is placed, such a strong and direct light is reflected upon the object, that it may be examined with all imaginable ease and pleasure. 1 he several parts of this instrument, made either ot brass or silver, are as follow. Through the first side A, passes a fine screw B, the other end of which is fastened to the moveable side C. D is a nut applied to this screw, by the turning of which the two sides A and C are gradually brought together. E is a spring of steel that separates the two sides when the nut is unscrewed. F is a piece of brass, turning round in a socket, whence proceeds a small spring tube moving upon a rivet; through which tube there runs a steel wire, one end whereof termi¬ nates in a sharp point G, and the other with a pair of pliers H fastened to it. The point and pliers are to thrust into, or take up and hold, any insect or object; and either of them may be turned upwards, as best suits the purpose, I is a ring of brass, with a female screw within it, mounted on an upright piece of the Same metal *, which turns round on a rivet, that it may be set at a due distance when the least magnifiers are employed. This ring receives the screws ot all the magnifiers. K is a concave speculum of silver, po¬ lished as bright as possible ; in the centre of which is placed a double convex lens, with a proper aperture to look through it. On the back of this speculum a male screw L is made to fit the brass ring I, to screw into it at pleasure. There are four of these concave specula of different depths, adapted to four glasses of different magnifying powers, to be used as the ob¬ jects to be examined may require. The greatest mag- Vriifiers have the least apertures. M is a round object- plate, one side of which is white and the other black : The intention of this is to render objects tho more vi¬ sible, by placing them, if black, on the white side, or, if white, on the black side. A steel spring N turns down on each side to make any object fast j and is¬ suing from the object-plate is a hollow pipe to screw it on the needle’s pdint G. O is a small box of brass, wfth a glass on each side, contrived to confine any li¬ ving object, in order to examine it: this also has a pipe to screw upon the end of the needle G. P is a turned handle of wood, to screw into the instrument when it is made use of. Q, a pair of brass pliers to take up any object, or manage it with conveniency. R is a soft hair-brush for cleaning the glasses, &c. S is a small ivory box for talcs, to be placed, when wanted, in the small brass box O. When you would view any object with this micro¬ scope, screw the speculum, with the magnifier yoQ Micro* think proper to use, into the brass ring I. Place your sc^>e* , object, either on the needle G in the pliers H, on the * object-plate M, or in the hollow brass box O, as may be most convenient *, then holding up your instrument by the handle P, look against the light through the magnifying lens 5 and by means of the nut D, together with the motion of the needle, by managing its lower end, the object may be turned about, raised, or de¬ pressed, "brought nearer the glass, or removed farther from it, till you find the true focal distance, and the light be seen strongly reflected from the speculum up¬ on the object, by which means it will be shown in a manner surprisingly distinct and clear j and for this purpose the light of the sky or of a candle will answer Very well. Transparent objects may also be viewed by this microscope } only observing, that when such come under examination, it will not always be proper to throw on them the light reflected from the speculum; for the light transmitted through them, meeting the re¬ flected light, may together produce too great a glare. A little practice, however, will show how to regulate both lights in a proper manner. 4. Ellin's single and Aquatic Microscope. Fig. 4. re- Fig- 4- presents a very convenient and useful microscope, con¬ trived by Mr John Ellis, author of An Essay upon Co¬ rallines, &c. To practical botanists, observers of ani- malcula, &v. it possesses many advantages above those just described. It is portable, simple in its construc¬ tion, expeditious, and commodious in use. K re¬ presents the box containing the whole apparatus : it is generally made of fish-skin ; and on the top there is a female screw, for receiving the screw that is at the bottom of the pillar A : this is a pillar of brass, and is screwed on the top of the box. D is a brass pin which fits into the pillar 5 on the top of this pin is a hollow socket to receive the arm which carries the magnifiers j the pin is to be moved up and down, in order to adjust the lenses to their focal or. proper dis¬ tance from the object. [N. B. In the representa¬ tions of this microscope, the pin I) is delineated as passing through a socket at one side of the pillar A; whereas it is usual at present to make it pass down a hole bored through the middle of the pillar.] E, the bar which carries the magnifying lens j it fits into the socket X, which is at the top of the pin or pillar D. This arm may be moved backwards and forwards in the socket X, and sideways by the pin D \ so that the magnifier, which is screwed into^fhe ring at the end E of this bar, may be easily made to traverse over any part of the object that lies on the stage or plate B. FF is a polished silver speculum, with a magnifying lens placed at the centre thereof, which is perforated for this purpose. The silver speculum screws into the arm E, as at F. G, another speculum, with its lens, which is of a different magnifying power from the former. H, the semicircle which supports the mirror I; the pin R, affixed to the semicircle H, passes through the hole which is towards the bottom of the pillar A. B, the stage, or the plane, on which the objects are to be placed j it fits into the small dove-tailed arm which is at the upper end of the pillar DA. C, a plane glass, with a small piece of black silk stuck on it; this glass is to lay in a groove made in the stage C. M, a hollow glass to be laid occasionally on the stage in- A 2 stead MIC [4 .Micro- Stead of the plane glass C. L, a pair of nippers, scope. These are fixed to the stage by the pin at bottom j " * the steel wire of these nippers slides backwards and forwards in the socket, and this socket is moveable upwards and downwards by means ot the joint, so that the position of the object may be varied at pleasure. The object may be fixed in the nippers, stuck on the point, or affixed, by a little gum-water, See. to the ivory cylinder N, which occasionally screws to the point of the nippers. To use this microscope : Take all the parts of the apparatus out of the box j then begin by screwing the v pillar A to the cover thereof; pass the pin li of the semicircle which carries the mirror through the hole that is near the bottom of the pillar A $ push the stage into the dove-tail at B, slide the pin into the pillar (see the N. .B. above) j then pass the bar E through the socket which is at the top of the pin D, and screw one of the magnifying lenses into the ring at F. The mi¬ croscope is now ready for use: and though the enume¬ ration of the articles may lead the reader to imagine the instrument to be of a complex nature, we can safely affirm that he will find it otherwise. The instrument has this peculiar advantage, that it is difficult to put any of the pieces in a place which is appropriated to an¬ other. Let the object be now placed either on the stage or ia the nippers L, and in such manner that it may be as nearly as possible over the centre of the stage : bring the speculum F over the part you mean to ob¬ serve $ then throw as much light on the speculum as you can, by means of the mirror I, and the double mo¬ tion of which it is capable $ the light received on the speculum is reflected by it on the object. The distance of the lens F from the object is regulated by moving the pin D up and down, until a distinct view of it is obtained. The best rule is, to place the lens beyond its foeal distance from the object, and then gradually to slide it down till the object appears sharp and well defined. The adjustment of the lenses to their focus, and the distribution of the fight on the object, are what require the most attention : on the first the distinctness of the vision depends j the pleasure arising from a clear view of the parts under observation is due to the modi¬ fication of the light. No precise rule can be given for attaining accurately these points j it is from practice alone that ready habits of obtaining these necessary pro¬ perties can be acquired, and with the assistance of this no difficulty will be found. ^ 5* A very simple and convenient microscope for botanical and other purposes, though inferior in many respects to that of Mr Ellis, was contrived by the ingenious Mr Benjamin Martin, and is represented at fig. 5. where AB represents a small arm supporting two or more magnifiers, one fixed to the upper part as at B, the other to the lower part of the arm at C $ these may be used separately or combined together. The arm AB is supported by the square pillar IK, the lower end of which fits into the socket E of the foot EG ; the stage DL is made to slide up and down the square pillar y H, a concave mirror for reflecting light on the object.—To use this microscope, place the object on the stage, reflect the light on it from the concave mirror, and regulate it to the focus, by moving the stage nearer to or farther from the lens at B. The ivory sliders pass through the stage *, other objects may j MIC be fixed in the nippers MN, and then brought under the Micro¬ eye-glasses j or they may be laid on one of the glasses scope, which fit the stage. The apparatus to this instrumentv—v—> consists of three ivory sliders j a pair of nippers ; a pair of forceps j a flat glass and a concave ditto, both fitted to the stage. The two last microscopes are frequently fitted up with a toothed rack and pinion, for the more ready ad¬ justment of the glasses to their proper focus. 6. Withering's portable Botanic Microscope. Fig. 6. pjg, 6 represents a small botanical microscope contrived by Dr Withering, and described by him in his Botanical Arrangements. It consists of three brass plates, ABC, which are parallel to each otherthe wares D and E are rivetted into the upper and lower plates, which are by this means united to each other; the middle plate or stage is moveable on the aforesaid wires by two little sockets which are fixed to it. The. two upper plates each contain a magnifying lens, but of different powers ; one of these confines and keeps in their places the fine point F, the forceps G, and the small knife H.—To use this instrument, unscrew the upper lens, and take out the point, the knife, and the forceps ; then screw the lens on again, place the object on the stage, and then move it up or down till you have gained a dis¬ tinct view of the object, as one lens is made of a shorter focus than the other; and spare lenses of a still deeper focus may be had if required. This little microscope is the most portable of any. Its principal merit is its simplicity. 7. Botanical Lenses or Magnifiers. The haste with which botanists, &c. have frequently occasion to view objects, renders an extempore pocket-glass indispen¬ sably necessary. The most convenient of any yet con¬ structed, appears to be that contrived, in regard to the form of the mounting, by Mr Benjamin Martin; and is what he called a Hand Mtgalascope, because it is wrell adapted for viewing all the larger sort of small objects universally, and by only three lenses it has seven different magnifying powers. Fig. 7. represents the case with the three frames and^g- 7* lenses, which are usually of 1, 14, and 2 inches focus: they all turn over each other, and shut into the case, and are turned out at pleasure. The three lenses singly, afford three magnifying powers; and by combining two and two, we make three more: for d with e makes one, d with f another, and e with f a third ; which, with the three singly, make six ; and lastly, all three combined together make an¬ other ; so that upon the whole, there are seven powers of magnifying with these glasses only. When the three lenses are combined, it is better to turn them in, and look through them by the small aper¬ tures in the sides of the ease. The eye in this case is excludenl from extra fight; the aberration of the superfluous rays through the glasses is cut off; and the eye coincides more exactly with the common axes of the lenses. A very useful and easy kind of microscope (describ- . ed by Joblot, and which has been long in use), adapt-cccxx)nflU* ed chiefly for viewing, and confining at the same time, any living insects, small animals, &c. is shown at fig. 8..rig. S, where A represents a glass tube, about inch dia¬ meter, and 2 inches high. B, a case of brass or wood, containing a sliding tube, with two or three magnify¬ ing Micro¬ scope. rig. MIC [ 5 j MIC ing glasses that may be used either separately or com¬ bined. In the inside, at the bottom, is a piece of ivory, black and white on opposite sides, that is occasionally removed, and admits a point to be screwed into the centre. The cap unscrews at D, to admit the placing of the object: the proper distance of the glasses from the object is regulated by pulling up or down the brass tube E at top containing the eye-glasses. This microscope is particularly useful for exhibiting the well-known curious curculio imperialism vulgarly called the diamond beetle, to the greatest advantage j for which, as well as for other objects, a glass bottom, and a polished reflector at the top, are often applied, to condense the light upon the object. In this case, the stand and brass-bottom F, as shown in the figure, are taken away by unscrewing. 9. Mr Lyonel's Single Anatomical Dissecting Micro- scope.—Fig. 9. represents a curious and extremely use¬ ful microscope, invented by that gentleman for the pur¬ pose of minute dissections, and microscopic prepara¬ tions. This instrument must be truly useful to ama¬ teurs of the minutite of insects, &c. being the best adapted of any for the purposes of dissection. TV ith this instrument Mr Lyonet made his very curious mi¬ croscopical dissection of the chenille de sank, as related in his TraitS Anatomique de la chenille qui range le hois de sank, 4to. AB is the anatomical table, which is supported by a pillar NO j this is screwed on the foot CD. The table AB is prevented from turning round by means of two steady pins. In this table or board there is a hole G, which is exactly over the centre of the mirror EF, that is to reflect the light on the object 5 the hole G is designed to receive a flat or concave glass, on which the objects for examination are to be placed. RXZ is an arm formed of several balls and sockets, by which means it may be moved in every possible si¬ tuation •, it is fixed to the board by means of the screw' H. The last arm IZ has a female screw7, into which a magnifier may be screwed as at Z. By means of the screw II, a small motion may be occasionally given to the arm IZ, for adjusting the lens with accuracy to its focal distance from the object. Another chain of balls is sometimes used, carrying a lens to throw light upon the object j the mirror is like¬ wise so mounted, as to be taken from its place at K, and fitted on a clamp, by which it may be fixed to any part of the table AB. To use the Dissecting Table.—Let the operator sit with bis left side near a light window7 \ the instrument being placed on a firm table, the side DH towards the stomach, the observations should be made with the left eye. In dissecting, the two elbows are to be sup¬ ported by the table on which the instrument rests, the hands resting against the board AB j and in order to give it greater stability (as a small shake, though im¬ perceptible to the naked eye, is very visible in the mi¬ croscope), the dissecting instruments are to be held one in each hand, between the thumb and tw7o fore¬ fingers. II. Of Double Microscopes, commonly called Com¬ pound Microscopes. Double microscopes are so called, from being a com¬ bination of two or more lenses. The particular and chief advantages which the com¬ pound microscopes have over the single, are, that the objects are represented under a larger field of view7, and' w ith a greater amplification of reflected light. I. Culpeper's Microscope.—The compound microscope, originally contrived by Mr Culpeper, is represented at fig. 10. It consists of a large external brass body A, tQ B, C, D, supported upon three scrolls, which are fixed ° to the stage EF 5 the stage is supported by three lar¬ ger scrolls, that are screwed to the mahogany pedestal GH. There is a drawer in the pedestal, which holds the apparatus. The concave mirror 1 is fitted to a- socket in the centre of the pedestal. The lower part LMCD of the body forms an exterior tube, into which the upper part of the body ABLM slides, and may be moved up or down, so as to bring the magnifiers, which are screwed on at N, nearer to or farther from the object. To use this microscope: Screw one of the buttons, which contains a magnifying lens, to the end N of the body : place the slider, with the objects, between the plates of the slider-holder. Then, to attain distinct vision, and a pleasing view of the object, adjust the body to the focus of the lens you are using, by moving the upper part gently up and dow7n, and regulate the light by the concave mirror. For opaque objects, two additional pieces must be used. The first is a cylindrical tube of brass (represent¬ ed at L, fig. 11.), which fits on the cylindrical part atpij, Ir> N of the body. The second piece is the concave specu¬ lum hi this is to be screwed to the lower end of the aforesaid tube: the upper edge of this tube should be made to coincide with the line which has the same num¬ ber affixed to it as to the magnifier you are using j e. g. if you are making use of the magnifier marked 5, slide the tube to the circular line on the tube N that-is marked also with N° 5. The slider-holder should be removed when you are going to view opaque ob¬ jects, and a plane glass should be placed on the stage in its stead to receive the object; or it may be placed' in the nippers, the pin of which fits into the hole in the stage. The apparatus belonging to this microscope consists of the following particulars : viz;. Five magnifiers, each fitted in a brass button 5 one of these is seen at N, fig. 10. Six ivory sliders, five of them with objects. A brass tube to hold the concave speculum. The concave speculum in a brass box. A fish pan. A set of glass tubes. A flat glass fitted to the stage. A concave glass fitted to the stage. A pair of forceps. A steel wire, with a pair of nippers at one end and a point at the other. A small ivory cylinder, to fit on the pointed end of the aforesaid nippers. A convex lens, moveable in a brass semicircle this is affixed to a long brass pin, which fits into a hole on the stage. The construction of the foregoing microscope is very simple, and it is easy in use y but the advantages of the stage and mirror are too much confined for an exteneivS' application and management of all kinds of objects. Its greatest recommendation is its cheapness; and to thosei who are desirous of having a compound microscope at’ a low price, it may be acceptable. 2. Cuff's Microscope.—The improved microscope nsxt in order is that of Mr Cuff. Besides remedying the disadvantages above mentioned, it contains the addition MIC {6 RHcro- addition of an adjusting screw, which is a consider- scope. able improvement, and highly necessary to the ex- ^ animation of objects under the best defined appear¬ ing. ii. ance from the glasses. It is represented at fig. II. with the apparatus that usually accompanies it. A, B, C, shows the body of this microscope j which contains an eye-glass at A, a broad lens at B, and a magnifier which is screwed on at C. The body is supported by the arm DE, from which it may be removed at pleasure. The arm DE is fixed On the sliding bar F, and may be raised or depres¬ sed to any height within its limits. The main pil¬ lar a b is fixed in the box be; and by means of the brass foot d is screwed to the mahogany pedestal XY, in which is a drawer containing all the apparatus. O is a milled-headed screw, to tighten the bar F when the adjusting screw c g- is used, p q\s the stage, or plate, which carries the objects 5 it has a hole at the centre n. G, a concave mirror, that may be turned in any direction, to reflect the light of a candle, or the sky, upon the object. To use this microscope: Screw the magnifier you intend to use to the end C of the body ; place the slider-holder P in the hole 77, and the slider with the object between the plates of the slider-holder; set the upper edge of the bar DE to coincide with the di¬ visions which correspond to the magnifier you have in use, and pinch it by the milled nut; now reflect a pfoper quantity of light upon the object, by means of the concave mirror G, and regulate the body exactly to the eye and the focus of the glasses by the adjusting screw c g. To view opaque objects, take away the slider-holder *- P, and place the object on a flat glass under the cen¬ tre of the body, or on one end of the jointed nippers op. Then screw the silver concave speculum h to the end of the cylinder L, and slide this cylinder on the lower part of the body, so that the upper edge thereof may coincide with the line which has the same mark with the magnifier that is then used : reflect the light from the concave mirror G to the silver speculum, from which it will again be reflected on the object. The glasses are to be adjusted to their focal distance as before directed. The apparatus consists of a convex lens H, to Col¬ lect the rays of light from the sun or a candle, and condense them on the object. L a cylindrical tube, open at each side, with a concave speculum screwed to the lower end h. P the slider-holder: this consists of a cylindrical tube, in which an inner tube is forced up¬ wards by a spiral spring; it is used to receive an ivory slider K, which is to be slid between the plates h and z. The cylinder P fits the hole n in the stage ^ and the hollow part at k is designed to receive a glass tube. R is a brass cone, to be put under the bottom of the cylinder P, to intercept occasionally some of the rays of light. S, a box containing a concave and a flat glass, between which a small living insect may be confined: it is to be placed over the hole n. T, a flat glass, to lay any occasional object upon ; there is also a concave one for fluids. O is a long steel wire, with a small pair of pliers at one end, and a point at the other, designed to stick or hold objects : it slips backwards and forwards in the short tube 0; the pin p fits into the hole of the stage. W, a little round ] MIC ivory box, to hold a supply of talc and rings for the Ml-ro- sliders. V, a small ivory cylinder, that fits on the scope, pointed end of the steel wire : it is designed for opaque " v objects. Light-coloured ones are to be stuck upon the dark side, and vice versa. M, a fish-pan, whereon to fasten a small fish, to view the circulation of the blood: the tail is to be spread across the oblong hole h at the small end, and tied fast, by means of a rib¬ band fixed thereto; the knob l is to be shoved through the slit made in the stage, that the tail may be brought under the magnifier. 3. This microscope has received several material im¬ provements from Mr Martin, Mr Adams, &c. By an alteration, or rather an enlargement, of the body of the tube which contains the eye-glasses, and also of the eye-glasses themselves, the field of view is made much larger, the mirror below for reflecting light is made to move upon the same bar with the stage ; by which means the distance of it from the stage may be very easily and suitably varied. A condensing glass is applied under the stage in the slider-holder, in order to modify and increase the light that is reflected by the mirrors be¬ low from the light of a candle or lamp. It is furnish¬ ed also with two mirrors in one frame, one concave and the other plane, of glass silvered; and by simply unscrewing the bodv, the instrument, when desired, may be converted into a single microscope. Fig. 12. is al'ig- 12., representation of the instrument thus improved; and the following is the description of it, as given by Mr Adams in his Essays. AB represents the body of the microscope, con¬ taining a double eye-glass and a body-glass ; it is here shown as screwed to the arm CD, from whence it may be occasionally removed, either for the conve¬ nience of packing, or when the instrument is to be used as a single microscope. The eye-glasses and the body-glasses are contained in a tube which fits into the exterior tube AB ; by pulling out a little tins tube when the microscope is in use, the magnifying power of each lens is increased. The body AB of the microscope is supported by the arm CD ; this arm is fixed to the main pillar CF, which is screwed firmly to the mahogany pedestal GH; there is a drawer to this pedestal, which holds the apparatus. NlS, the plate or stage which carries the slider-holder KL ; this stage is moved up or down the pillar CF, by turning the milled nut M ; this nut is fixed to a pinion, that works in a toothed rack cut on one side of the pil¬ lar. By means of this pinion, the stage may be gradu¬ ally raised or depressed, and the object adjusted to the focus of the different lenses. KL is a slider-holder, which fits into a hole that is in the middle of the stage NIS ; it is used to confine and guide either the motion of the sliders which contain the objects, or the glass tubes that are designed to confine small fishes for viewing the circulation of the blood. The sliders are to be passed between the two upper plates, the tubes through the bent plates. L is a brass tube, to the upper part of which is fixed the condensing lens before spoken of; it fits into the under part of the slider-holder KL, and may be set at different distances from the object, according to its dis¬ tance from the mirror or the candle. O is the frame which holds the two reflecting mir¬ rors. MIC [ Micro- rors, one of which is plane, the other concave. These scope, mirrors may be moved in various.directions, in order 1 ‘ to reflect the light properly, by means of the pivots on which they move, in the semicircle QSR, and the motion of the semicircle itself on the pin S : the con¬ cave mirror generally answers best in the day-time; the plane mirror cembines better with the condensing lens, and a lamp or candle. At I) there is a socket for receiving the pin of the ^rm Q (fig. 31.) to which the concave speculum, for reflecting light on opaque objects, Plate is fixed. At S is a hole and slit for receiving either the CCCXLI. nippers*L (fig. 31.) or the fish-pan I j when these are 31* used, the slider-holder must be removed. T, a hole tp receive the pin of the convex lens M. To use this microscope : Take it out of the box. Screw the body into the round end of the upper part of the arm CD. Place the brass sliders, which con¬ tain the magnifiers, into the dove-tailed slit which is on the under side of the aforesaid arm, as seen at E, and slide it forwards until the magnifier you mean to use is under the centre of the body : opposite to each magnifier in this slit there is a notch, and in the dove-tailed part of the arm CD there is a spring, which falls into the above-mentioned notch, and thus makes each magnifier coincide with the centre of the body. Pass the ivory slider you intend to use between the upper plates of the slider-holder KL, and then reflect as strong a light as you can on the subject by means of one of the mirrors j after this, adjust the ob¬ ject to the focus of the magnifier and your eye, by turning the milled screw M, the motion of which raises and depresses the stage NIS. The degree of light necessary for each object, and the accuracy required in the adjustment of the lenses to their proper focal di¬ stance from the object, will be easily attained by a little practice. When opaque objects are to be examined, remove the slider-holder, and place the object on a flat glass, or fix it to the nippers L, the pin of these fit into the hole on the stage *, screw* the concave speculum R into the arm Q (fig, 31-), and then pass the pin of this arm through the socket D (fig. 12.) 5 the light is now to he reflected from the concave mirror to the silver spe¬ culum, and from this down on the object. No exact rule can be given for reflecting the light on the object; we must therefore refer the reader to the mother of all aptness, practice. The speculum must he moved lower or higher, to suit the focus of the different magnifiers and the nature of the object. The foregoing directions apply equally to the using of this instrument as a single microscope; with this dif¬ ference only, that the body AB is then removed, and the eye is applied to the upper surface of the arm CD, exactly.over the magnifiers. This microscope is sometimes made with the follow¬ ing alterations, which are supposed to make it still more convenient and useful. The arm CD that car¬ ries the body, and magnifiers is made both to turn on a pin, and to slide backwards and forw*ards in a socket at C j so that, instead of moving the objects below on the stage, and disturbing them, the magnifiers are more conveniently.brought over any part of the objects as desired. The condensing glass is made larger, and slides upon the square bar CF quite distinct from the stage, .like the mirrors below*} and it is thereby made ] MIC useful for any other objects that may he applied en Micro- glasses fitted to the stage, as w'dl as those put into the scope, slider-holder K. It is thereby not confined to this stage —— alone as in the preceding. When the body AB is taken away, the arm CD may be slipt away from its bar, with the magnifiers, and the forceps, wire, and joint, applied to it j and it thereby serves the purpose of a small single or opaque hand microscope, for any ob¬ ject occasionally applied to this wire. The magnifiers in the slider E are mounted in a wheel case, which per¬ haps prevents its being in the way so much as the long slider E before described.—This contrivance is repre¬ sented at X, fig. 12. 4. Martin'*s New Universal Compound Microscope.— This instrument w*as originally constructed by Mr B. Martin, and intended to comprise all the uses and ad¬ vantages of the single, compound, opaque, and aquatic microscopes. The follow ing is a description of it. Fig. 13. is a representation of the instrument pla- Plate ced up for use. ABCD is the body of the micro-cccxxxir.. scope : w’hich consists of four parts, viz. AB the eye- 13* piece, or that containing the eye-glasses, and is screw¬ ed into C, which is a moveable or sliding tube on the top ; this inner tube contains the body-glass screw*ed into its lower part. D is the exterior tube or case, in which the other slides up and down in an easy and. steady manner. This motion of the tube C is useful to increase and decrease the magnifying power of the body-glass when thought necessary, as before mention¬ ed. E is a pipe or snout screwed on to the body of the microscope D, and at its lower part, over the several magnifying lenses hereafter described. FGHI is the square stem of the microscope, upon which the stage R moves in an horizontal position, upwards or down¬ ward, by means of the fine rack work of teeth and pinion. KL is a strong solid joint and pillar, by which the po¬ sition of the instrument is readily altered from a verti¬ cal one to an oblique or to a perfectly horizontal one as may be required : it is thus well adapted to the ease of the observer either sitting or standing ; and as it is very often convenient to view objects by direct unreflected light, when the square stem FI is placed in a horizon¬ tal position for this purpose, the mirror T is then to be taken oft’ in order to prevent the obstruction of the rays. M is a circular piece of brass, serving as a base to the pillar. NOP, the tripod or foot by which the whole body of the microscope is steadily supported ; it folds up when packed into the Case. W is a brass frame, that contains the condensing lens, and acts in conjunction with the large concave and plane mirrors below at T; the reflected rays from which, either of the common light or of that of a candle or lamp, it agreeably modifies, and makes steady in the field of view. The particulars of the apparatus to this •microscope are as follow : Q is a circular brass box, containing six magnifiers or object lenses, numbered 1, 2, 3, 4, 5, 6 j the digits 'of which appear severally through a small round hole in the upper plate of it. To the upper side is fixed a small circle of brass, by which it is connected with, and screwed into, the round end of the arm a b c d; which is a long piece of brass, and moves through either by teeth or pinion, or not, as may be desired, in c f; which is a socket on the upper part of the pillar, and admits, with a motion both easy and steady, the •*' brass MIC [8 Micro- twass arm. R is a fixed stage, upon will oh the objects scope. to be viewed are to be placed : it is firmly fastened to 1 ^ ' v '■' the square pillar, which is moved by the rack-work. In the middle is a large circular hole, for receiving concave glasses, with fluids, &c. } it has also a sliding spring frame to fasten down slips of glass or other things, at a be are three small sockets or holes, intended to receive several parts of the apparatus. S is the refrac¬ tor, or illuminating lens, for converging the sun’s rays upon opaque objects laid upon the stage R. lo this purpose it moves on a semicircle upon a long shank g, in a spring socket h, in the arm this arm moving every way by a stout pm k in the socket o. ot the stage. In this manner it is easily adjusted to any position of the sun, candle, &c.—T, the reflecting-glass frame, con¬ taining a concave and plane speculum, which is moved upon the square pillar by the hand. The use.of it is to illuminate all transparent objects that are applied to the stage above. Fig. 14. Fig. 14. N° I. is an auxiliary moveable stage ; which ,- by means of a pin k is placed in the hole a of the stage 11, and can be moved in a horizontal direction over the whole field of the stage. In this stage, there are three circular holes with shouldered bottoms j a large one in the middle, and on each side a small one, for the reception of the three following necessary arti¬ cles : N° 2. a watch-glass to he placed in the large hole, to hold fluids containing animalcules, Sec. j a circu¬ lar piece of ivory, N° 3. one side of which is black, the other white, to support opaque objects of different con¬ trasted colours 5 and circular plane and concave glasses, N°4. for extemporaneous transparent objects.—Thesame use is made of the other small hole as of the large one, only in a lesser degree, to receive small conoave glasses, , plates, &c. N° 5. is the silvered speculum, called, a hberkhun, which makes the single opaque microscope, by being screwed to the slider abed (fig. 13.) in room of the box of lenses Q, and the body AE above it. The chief use of this is to view very small objects strongly illu¬ minated near the compounded focus of the mirror T (fig. 13.). N° 6. is the forceps or pliers, for holding such kind of objects, and by which they can be ap¬ plied very readily.to the. .focus of the lens in the li- berkhun. They have a motion all ways by means of the spring socket o, the joint 6, and the shank c: they are placed in the socket c of the fixed stage R (fig. 13.). 7* is a small piece of ivory, to be placed upon the pointed end of the pliers :• it is black upon one side, and white upon the other, to receive opaque objects. N° 8. is a liberkhun of a larger size than that first mentioned, with a hole in its centre : this is screwed into N° 9. the hole o of a brass ring, fastened to a long wire b; which moves up and down in the spring soc¬ ket b of the stage R, in which it also moves sideways •, and thus, with the body AE above, forms an aquatic compound microscope for showing all sorts of objects in water and other fluids placed under it in the watch-glass N° 2. on the stage. N° 11. is a cone, with a proper aperture a to exclude superfluous light, that would disturb a critical observa¬ tion of a curious object 5 it is placed on the under side of the fixed stage R. N° 12. is what is usually called a bug-box, ©onsist- ■2 ] MIC ing of a concave glass with a plane one screwed over Mirro- it j by means of which a bug, louse, flea, &c. may be scopes secured and viewed alive. It is to be placed on either of the stages R (fig. I3‘)> or K° 1. (fig. I4*)* N° 13. is the fish pan. In the long concave body a bt ti fish may be so confined by the ribband c, that the transparent tail may be in part over the slit or hole at a. In this state, it is placed on the stage R, with the pin d in the hole c of the stage, and moves free¬ ly and horizontally for viewing the circulation of the blood, &c. N° 14. is the slider-holder that is placed on the stage R * it receives the sliders and tubes when filled with transparent objects, to be viewed either by the com¬ pound or single microscope. N° 15. represents the ivory slider, to hold the objects between the talcs as usual. N° 16. is a useful auxiliary slider framed in brass. In this slider small concave glasses are cemented *, and a slip of plane glass slides over them j by which any small living object, as mites, &c. may be confined with¬ out injury, and deliberately viewed. 17. represents a set ot glass tubes, three in num¬ ber, one within another j they are useful for small tad¬ poles, w'ater newts, eels, &c. when the circulation of the blood is to be viewed. There is a small hole at one end of each tube, that serves to admit the air $ tor when they are filled with water,• the other end is stop¬ ped with a cork. N° 18. is a small ivory box, containing spare talcs and wires, to supply the sliders with occasionally. N0 19. a brass cell or button, containing a very small lens, properly set between two small plates of brass, that it may be brought very near to the object when viewed therewith as a single microscope. Tliis magni¬ fier is screwed into the same hole as the wheel of six magnifiers Q are (fig. 13.). N° 20. is a lens, adapted to view and examine ob¬ jects, by magnifying them sufficiently, so as to be able to apply them to the microscope lor inspection : on this account it is called the exphrator. The preceding are the chief articles of the appara¬ tus : which, on account of their being somewhat dif¬ ferent from what is applied to other microscopes, we have been thus particular in describing. In using the microscope, and while viewing objects by either the single or compound instrument, the focal distances of the magnifiers are made perfectly exact by turn¬ ing of the pinion at the nut ,ty, in one way or the other, very gently in the teeth ol the rack-work at X (fig. 13.). It is necessary that the centres of the object-lenses or magnifiers, the stage, and the mirrors at bot¬ tom, should all be in a right.line in the axis of the microscope, when opaque objects are to be viewed, that are placed upon the ivory piece N° q. or the for¬ ceps 6. and all other such sort of objects which are placed in the centre of the stage R, or slider-holder N° 14 : But when aquatic or living objects, which re¬ quire a great space to move in, are to be viewed, then the horizontal motion oX. e f (fig. 13.) is made use ol, and the view may be extended laterally over the whole of the diameter of the object or field of view ; and by putting the arm abed forward or backward in its socket e j\ the view is extended in the contrary direction MIC [ 9 J MIC Micro direction equally well j and in this manner the whole scope, of the objects may be viewed without the least disturb- ance. As the brass arms abed may be brought to the height of three or four inches above the stage R ; so, by means of the rack-work motion of the stage, a lens of a greater focal distance than the greatest in the wheel Q may be occasionally applied in place of the wheel, and thereby the larger kind of objects be viewed j the instrument becoming, in this case, what is called a megalascope. In viewing moving living objects, or even fixed ones, when nice motions are requisite, a rack-work and pi¬ nion is often applied to the arm abed: the arm is cut out rvith teeth j and the pinion, as shown at Y, is applied to work it. This acts but in one direction •, and, in order to produce an equally necessary motion perpendicular to this, rack-work and pinion is applied tangent-wise to the stage, which is then jointed. What has been related above respects the construc¬ tion of those denominated parlour microscopes, in con¬ tradistinction to those which are portable : their di¬ mensions, however, have been considerably reduced by opticians, in order to render them fit for the pocket; and as they are for the most part constructed on nearly the same principles as those which have been already described, what has been said will sufficiently instruct our readers in using any pocket microscope whatever. Only it may be observed, that in those reduced instru¬ ments, both the field of view and the magnifying power are proportionably diminished. We shall conclude the account of this sort of mi¬ croscope with descriptions of a very portable pocket apparatus of microscopic instruments, and of a new mi¬ croscopic pocket telescope, both invented by the late Mr B. Martin, and since made by most instrument- makers in London. jg jr. The former is represented at fig, 15. It consists of two parts, viz. the body a b, and the pedestal i k, ■which is joined by a screw at the part between b and u It consists of three cylindric tubes, viz. (1.) the exterior tube, or case, a b; (2.) a middle tube eh; and (3.) the interior tube f g. The middle tube c d is the adjuster j and is connected with the outer tube by the rack-work of teeth and pinion, as shown at e: by which means it is moved up and down at pleasure through the smallest space, and carries with it the internal tube/'(_g. The interior tube/*g receives on its lower part at b the several capsules or boxes 2, 3, 4, .5, (fig. 16.) which contain the object lenses or magnifiers. The method of using this compound microscope in the perpendicular position, is as follows : The stage N° 1. is put within the exterior tube at b. Un¬ der the springs are applied the four ivory sliders, which contain a variety of transparent objects 5 then move the interior tube f g up and down with the hand, till you discern the object in the slider, and there let it rest. After this, turn the pinion at c very tenderly one way or the other, till you obtain a perfect view of the transparent objects properly illuminated, from a mirror contained in the pedestal or- stand i k, sus¬ pended upon, and moveable about, the points of Vol. XIV. Part I. two screws (//). N° 6. (fig. 16.) represents a-move- Micro- able stage, which is placed in the spring socket m. It < scope, contains a concave glass, for the reception of animal-^ cules in fluids ; and has the advantage of blunging any 0 part into view by moving the handle at ?i. If living and moving objects are required to be shown, they must he confined in the concave, by putting a glass cover, N° 7. upon the stage 5 and then a small spider, a louse, a flea, bug, &c. may be seen, and the motion or cir¬ culation of the blood, &c. observed with surprising di¬ stinctness. To view the circulation of the blood in the most eminent degree, it must be done by placing small frogs, tadpoles, water-newts, fishes, &c. in a tube as repre¬ sented N° 8. (fig. 17.)', which tube is placed in the Fig. 17. holes 0 in the opposite sides of the case a b, fig. 15. in the lower part.—N° 9. (fig. 16.) is a pair of pincers or pliers d, for holding any object; the other end of the steel wire is pointed to receive a piece of ivory b, with one end black, and the other white, on which you . stick objects of different hue: this also, when used, is placed in the spring socket ?«. To use this instrument as a compound opaque, you screw off the body part a b, and screw to it the handle r (fig. 16.) j by this means you may hold the micro¬ scope in a horizontal position, as shown in the figure. The silver dish or speculum (which is contained in the bottom or base k, fig. 15.), is then screwed on at b. N° 9. is placed in the spring socket tn, and adjusted backward and forward in m, till the reflected light from the speculum falls in a proper manner on the opaque object. Either of the four magnifiers, 2, 3, 4/5, may be used, and brought to a proper focus, as before describ¬ ed by the tooth and, pinion e (fig. 15.). If you take off the opaque apparatus, and apply the stage N° 1. (fig. 16.) w'ith an ivory slider, and at the end b screw in either of the two lenses, N° 10. (which are distinguished by the name of illuminators), the microscope being held up to the light (and properly adjusted),.the whole field of view will be strongly illuminated, and present a most pleasing appearance of any transparent object. These two convex lenses are of different focuses, and are to be used singly or together ; N° 2- being the greatest magni¬ fier, will require the object to be strongly illuminated, and of course both the lenses must be used together. By candle-light, this method of viewing transparent ob¬ jects will prove very entertaining *, by screwing the handle r into the part s of N° 10. it becomes a delight¬ ful hand megalascope for viewing flowers, fossils, shells, &cc, ; and each lens, as before mentioned, having a different focus, produces two magnifying powers used singly, and when combined a third. The manner of using this instrument as a single mi¬ croscope (like Wilson’s) is represented in fig. 1 7. where the button or magnifier at each is to be screwed off, and the circular piece N° 11. is screwed in its place. This piece has a spring socket made to receive the slider-hol¬ der N° 12. N° 13. is a circular piece of brass, with a long shank and spring, and is introduced through the outside tube a b at t. N° 2, 3, 4, 5, are screwed occa¬ sionally in the centre of this piece, and used as single lenses with ivory sliders, &c. N° 14. contains a lens of a great magnifying power, for viewing very minute ob¬ jects : to render this instrument the most complete single opaque microscope, you have only to screw into N° 13. f B the MIC [ i< tlie sliver speculum N° 15. which has a small lens set in its centre. The slider-holder N° 12. is taken out of N° 11, and the pincers or nippers d b, being detached from the other part of N° 9. are passed through the long spring socket N° II. and ready to receive any opaque body in the pincers, or on the black and white piece of ivory. To the large screw of N° 13- are applied the two lenses N° 10. which make it the completest megalascope that can be desired. The handle r contains the four ivory sliders with objects. The shagreen case which contains this universal mi¬ croscope and its apparatus, is six inches long, three inches wide, two inches deep j and weighs together 16 ounces. “ Thus (says Mr Martin) so small, so light, so portable, and yet so universally complete, is this pocket microscopic apparatus, that you find nothing material in the large three-pillared microscope, the epaque microscope, \Vilson’s single microscope, and the aquatic microscope, all, together, which you have not in this ; besides some very considerable advantages in regard to the field of view, &c. which they have not (a).” This inventive artist having contrived a construc¬ tion of the compound microscope so small as to admit of being packed in a common walking cane, thought next of introducing the same instrument into the inside of what he called his Pocket Three-brass drawer Achro¬ matic Telescope. The same eye glasses that serve the purpose ot a telescope, answer as the compound magni¬ fier, for viewing transparent and opaque objects in a microscope. Fig. 18, 19, 20, represent the telescope separated by unscrewing it at m, in order that the whole ot the necessary parts in use may be exhibited. Fig. 19. represents the exterior tube, which is ot mahogany,^ and its rims of brass. It is detached from the rest of the telescope, as not making any part of the micro¬ scope. The brass cover k /, that shuts up the object- glass of the telescope, is also the box which contains the two-wheel object frames, and a small plain reflect¬ ing mirror. In fig. 20. A is the cover taken off, by unscrew¬ ing the top part: The mirror B is taken out} and al¬ so, by unscrewing the bottom part, the two circular wheels, with the objects shown in C and D. Fig. 18. is a representation of the three internal brass sliding tubes of the telescope, which form the microscopic part. The tubes are to be drawn out as shown in this figure; then, at the lower end of the large tube in the inside, is to be pulled out a short tube b c, that serves as a kind of stage to hold the wheels, with objects, and support the reflecting mirror. This tube is to be partly drawn out, and turned so that the circular hole that is pierced in it may coin¬ cide with a similar hole that is cut in the exterior tube. This tube is represented as drawn out in the figure ; , ] MIC and the mirror B placed therein, and the wheel with Micro, transparent objects. C (fig. 20.) represents the wheel sc0Pe- with transparent objects, and L) the wheel with opaque objects. They are both made of ivory; and turn round upon a centre brass pin slit upon the top, which fits upon the edge of the tube ; which tube is then to be pushed up into the telescope tube, so that its lower end may rest upon the upper edge of the wdieel ac¬ cording to its view at a, fig. 18. In viewing the objects, the second brass tube of the telescope must be pushed down, till its milled edge at top falls upon that of the exterior tube ; taking care that the circular hole is duly placed to the exterior one. These circular holes are not seen in fig. 18. being sup¬ posed in the opposite side, where the wheel is fixed. The adjustment for the focus is now' only necessary ; which is obtained by pushing downwards or upwards the proper tube, till the object appear quite distinct. In viewing transparent objects, the instrument may be used in two positions ; one vertical, when the light is to be reflected upon the object by the mirror; the other, by looking up directly against the light of a candle, common light, &c.; in which case the mirror must be taken away. In viewing opaque objects, the mirror is not used ; but as much common light as possible must be admitted through the circular holes in the sides of the tubes. There is a spare hole in the transparent wheel, and also one in the opaque, to receive any occasional object that is to be viewed. Any sort of object whatsoever may be viewed, by only pushing up the microscope tube into its exterior, and bringing the first eye-tube to its focal distance from the object. The brass tubes are so contrived, that they stop when drawn out to the full length : so that by applying one hand to the outside tube, and the other to the end of the smallest tube, the telescope at one pull may be drawn out; then any of the tubes (that next to the eye is best) may be pushed in gra¬ dually, till the most distinct view of the object be ob¬ tained. The tubes all slide through short brass spring tubes, any of which may be unscrewed from the ends ot the sliding tubes by means of the milled edges which pro¬ ject above the tubes, taken from each other, and the springs set clear if required. III. Of Solar Microscopes. This instrument, in its principle, is composed of a tube, a looking-glass or mirror, a convex lens, and Wilson’s single microscope before described. The sun’s rays being reflected through the tube by means of the mirror upon the object, the image or picture of the object is thrown distinctly and beautifully upon a screen of white paper or a white linen sheet, placed at a proper distance to receive the same ; and may be magnified (a) Notwithstanding the properties that have been ascribed to the above instrument, and the praises bestowed upon it by some, which induced us to admit so minute a description, we must apprise our readers, that it has been omitted in Mr Adams’s enumeration; and upon inquiry we learn, that it has fallen into neglect among the most judicious opticians, being found too imperfect to serve the purposes of science, and too complicated for the use 0! persons who seek only entertainment. Micro¬ scope. Plate CCCXL. fig- 31. MIC [ i: magnified to a size not to be conceived by those who have not seen it: for the farther the screen is re¬ moved, the larger will the object appear •, insomuch, that a louse may thus be magnified to the length of five or six feet, or even a great deal more} though it is more distinct when not enlarged to above half that size. The different forms in which the Solar Microscope is constructed, are as follow. I. The old construction is represented in fig. 21. A is a square W'ooden frame, through which pass two long screws assisted by a couple of nuts I, I. By these it is fastened firmly to a window shutter, wherein a hole is made for its reception } the two nuts being let into the shutter, and made fast thereto. A circular hole is made in the middle of this frame to receive the piece of wood B, of a circular figure j whose edge, that projects a little beyond the frame, composes a shallow groove 2, wherein runs a catgut 3 j which, by twist¬ ing round, and then crossing over a brass pulley 4, (the handle whereof 5, passes through the frame), affords an easy motion for turning round the circular piece of wood B, with all the parts affixed to it. C is a brass tube, which, screwing into the middle of the circular piece of wood, becomes a case for the unco¬ vered brass tube D to be drawn backwards or forwards in. E is a smaller tube, of about one inch in length, cemented to the end of the larger tube D. F is another brass tube, made to slide over the above de¬ scribed tube E ; and to the end of this the microscope must be screwed, when we come to use it. 5. A con¬ vex lens, whose focus is about 12 inches, designed to collect the sun’s rays, and throw them more strongly upon the object. G is a looking-glass of an oblong figure, set in a wooden frame, fastened by hinges in the circular piece of wood B, and turning about therewith by means of the above-mentioned catgut. H is a jointed wire, partly brass and partly iron j the brass part whereof 6, which is flat, being lastened to the mirror, and the iron part 7, which is round, passing through the wooden frame, enable the observer, by putting it backwards or forwards, to elevate or de¬ press the mirror according to the sun’s altitude. There is a brass ring at the end of the jointed wire 8, where¬ by to manage it with the greater ease. The extremi¬ ties of the catgut are fastened to a brass pin, by turn¬ ing of which it may be braced up, if at any time it be¬ comes too slack. When this microscope is employed, the room must be rendered as dark as possible ; for on the darkness of the room, and the brightness of the sunshine, de¬ pend the sharpness and perfection of your image. Then putting the looking-glass G through the hole in vour window shutter, fasten the square frame A to the shutter by its two screws and nuts 1,1. This done, adjust your looking-glass to the elevation and situation of the sun, by means of the jointed wire H, together with the catgut and pulley, 3, 4. For the first of these raising or lowering the glass, and the other in¬ clining it to either side, there results a twofold mo¬ tion, which may easily be so managed as to bring the glass to a right position, that is, to make it reflect the sun’s rays directly through the lens 5, upon the paper screen, and form thereon a spot of light exactly round. But though the obtaining a perfect circular spot of : ] MIC light upon the screen before you apply the micro- Micro¬ scope, is a certain proof that your mirror is adjusted scope, right, that proof must not always be expected : for the 'r~ sun is so low in winter, that if it shine in a direct line against the window, it cannot then afford a spot of light exactly round 5 but if it be on either side, a round spot may be obtained, even in December. As soon as this appears, screw the tube D into the brass collar provided for it in the middle of your wood-work, taking care not to alter your looking-glass: then screwing the magnifier you choose to employ to the end of your microscope in the usual manner, take away the lens at the other end thereof, and place a slider, containing the objects to be examined, between the thin brass plates, as in the other -ways of using the mi¬ croscope. Things being thus prepared, screw the body of the microscope over the small end E of the brass tube F ; which slip over the small end E of the tube D, and pull out the said tube D less or more as your ob¬ ject is capable of enduring the sun’s heat. Dead ob¬ jects may be brought within about an inch of the focus of the convex lens 5 } but the distance must be shortened for living creatures, or they will soon be killed. If the light fall not exactly right, you may easily, by a gentle motion of the jointed wire and pulley, di¬ rect it through the axis of the microscopic lens. The short tube F, to which the microscope is screwed,. renders it easy, by sliding it backwards or forwards on the other tube E, to bring the objects to their focal distance j which will be known by the sharpness and clearness of their appearance : they may also be turn¬ ed round by the same means without being in the least disordered. The magnifiers most useful in the solar microscope are in general, the fourth, fifth, or sixth. The screen on which the representations of the objects are thrown, is usually composed of a sheet of the largest elephant paper, strained on a frame which slides up or down, or turns about at pleasure on a round wooden pillar, alter the manner of some fire screens. Larger screens may also be made of several sheets of the same paper pasted together on cloth, and let down from the ceiling with a roller like a large map. “ This microscope (says Mr Baker) is the most en¬ tertaining of any; and perhaps the most capable of making discoveries in objects that are not too opaque : as it shows them much larger than can be done any other way. There are also several conveniences at¬ tending it, which no other microscope can have : for the weakest eyes may use it without the least straining or fatigue : numbers of people together may view any object at the same time ; and by pointing to the parti¬ cular parts thereof, and discoursing on what lies before them, may be able better to understand one another, and more likely to find out the truth, than in other microscopes, where they must peep one after another, and perhaps see the object neither in the same light nor in the same position. Those also, who have no skill iu drawing, may, by this contrivance, easily sketch out the exact figure of any object they have a mind to pre¬ serve a picture of; since they need only fasten a paper, on the screen, and trace it out thereon either with a pen or pencil, as it appears before them. It is worth B 2 the MIC [ 12 ] MIC Micro¬ scope. Fig. 2 2. Plate cccxxxxix Fig. 23. tlie while of those who are desirous of taking many draughts in this way, to get a frame, wherein a sheet of paper may be put in or taken out at pleasure j for if the paper be single, the image of an object will be seen almost as plainly on the back as on the fore side } and, by standing behind the screen, the shade of the hand will not obstruct the light in drawing, as it must in some degree when one stands before it.” I his con¬ struction, however, has now become rather obsolete, and is superseded by the following. II. The improved Solar Microscope, as used with the improved single Microscope, with teeth and pinion. Fig. 22. represents the whole form of the single microscope ; the parts of which are as follows : ABCD the external tube GHIK the internal moveable one ; QM part of another tube within the last, at one end of which is fixed a plate of brass hollowed in the middle, for re¬ ceiving the glass tubes, there is also a moveable flat plate, between which, and the fixed end of the second tube, the ivory sliders are to be placed. L, a part of the microscope, containing a wire spiral spring, keep¬ ing the tube QM with its plates firm against the fixed part IK of the second tube. EF is the small rack-work of teeth and pinion, by which the tube IG is moved gradually to or from the end AB, for adjusting the objects exactly to the focus of different lengths. " NO is a brass slider, with six magnifiers ; any one of which may easily be placed be¬ fore the object. It is known when either of the glasses is in the centre of the eye-hole, by a small spring fall¬ ing into a notch in the side of the slider, made against each of the glasses. Those parts of the apparatus, fig. 14. marked N° 15, 16, I7> tg, 20, 21, and 22. arc made use of here to this microscope. GH is a brass cell, which holds an illuminating glass for converging the sun’s beams or the light of a candle strongly upon the objects. The aperture of the glass is made greater or less, by two circular pieces of brass, with holes of different sizes, that are screwed separately over the said lens. But at times objects ap¬ pear best when the microscope is held up to the com¬ mon light only, without this glass. It is also taken away when the microscope is applied to the apparatus now to be described. Fig. 23. represents the apparatus, with the single microscope screwed to it, which constitutes the Sola? Microscope. AB is the inner moveable tube, to which the single microscope is screwed. CD is the external tube, containing a condensing convex glajss at the end D, and is screwed into the plate EF, which is cut with teeth at its circumference, and moved by the pi¬ nion I, that is fixed with the plate GH. This plate is screwed fast against the window-shutter, or board fitted to a convenient window of a darkened room, when the instrument is used. KL is a long frame, 'fixed to the circular plate EF •, containing a looking- glass or mirror for reflecting the solar rays through the fens in the body of the tube D. O is a brass milled head, fastened to a worm or endless screw *, which on the outside turns a small wheel, by which the reflecting mirror 1VI is moved upwards and downwards. In using this microscope, the square frame GH is first to be screwed to the window shutter, and the room well darkened : which is best done by cutting a round hole of the size of the moveable plate EF, that carries the reflector, in the window-shutter or Micro- board } and, by means of two brass nuts a a, let in- SC0I)C- to the shutter to receive the screws PP, when placed ' ’ ” through the holes in the square frame GH, at the two holes QQ : which will firmly fasten the microscope to the shutter, and is easily taken away by only Unscrew¬ ing the screws PP. The white paper screen, or v/hite cloth, to receive the images, is to be placed several feet distant from the window : which will make the representations the larger in proportion to the distance. The usual dis¬ tances are from 6 to 16 feet. The frame KL, with its mirror M, is to be moved by turning the pinion I, one way or the other, till the beams of the sun’s light come through the hole into the room : then, by turning of the worm at O, thq mirror must be raised or depressed till the rays be¬ come perfectly horizontal, and go straight across the room to the screen. The tube CD, with its lens at D, is now to be screwed into the hole of the circular plate EF : by this glass the rays will be converged to a focus } and from thence proceed diverging to the screen, and there make a large circle of light. The single microscope, fig. 22. is to be screwed on to the end AB (fig. 23.) of the inner tube ; and the slider NO, with either of the lenses marked 1, 2, 3, 4, 5, or 6, in the centre of the hole at the end AB. This will occasion a circle of light upon the screen much larger than before. The slider or glass-tube, with the objects to be viewed, is to be placed between the plates at IK against the small magnifier, and moved at plea¬ sure. By shifting the tube AB in or out, you may place the object in such a part of the condensed rays as shall be sufficient to illuminate it, and not scorch or burn it; which will generally require the glass to he about one inch distant from the focus. It now re¬ mains only to adjust the object, or to bring it so near to the magnifier that its image formed upon the screen shall be the most distinct or perfect : and it is effected by gently turning the pinion F, fig. 22. a small matter one way or the other. If the object be rather large in size, the least magnifiers are generally used, and vice versa. N° 1. is the greatest magnifier, and N° 6. the least, in the brass slider NO. But, if desired, single lenses of greater magnifying powers are made: and they are applied, by being screwed to the end AB, fig. 2 2. and the brass slider NO is then taken away. The same object may be variously magnified, by the lenses severally applied to it} and the degree of mag¬ nifying power is easily known by this rule: As the di¬ stance of the object is to that of its image from the mag¬ nifier; so is the length or breadth of the object to that of the image. Instead of the brass sliders with the lenses NO, there is sometimes screwed a lens of a large size, and longer focal distance : the instrument is then converted into a megafascope; and is adapted for viewing the larger kind of objects contained in large sliders, such as is represented at li. And, in the same manner, small objects of entertainment, painted upon glass like the sliders of a magic lanthorn, are much magnified, and represented upon the same screen. The solar microscopes just described are capable on¬ ly of magnifying transparent objects; for which pur- 4 pose M I C pose the last Instrument is extremely well adapted. But as opaque objects form the most considerable part of the curious collections in the works of art as well as nature, a solar microscope tor this purpose was a long time wanted.—For several years previous to 1774, Mr Martin made several essays towards the construction of such an instrument; and at last com¬ pleted one about the time just mentioned, which he named, .. . III. The Opaque Solar Microscope. With this in¬ strument (to use his own words) “ all opaque objects, whether of the animal, vegetable, or mineral king¬ dom, may be exhibited in great perfection, in all their native beauty j the lights and shades, the prominences and cavities, and all the varieties of different hues, tints, and colours ; heightened by reflection of the so¬ lar rays condensed upon them.— Transparent objects are also shown with greater perfection than by the common solar microscope.” Fig. 24. represents the solar opaque microscope, mounted for exhibiting opaque objects. Fifc' from a single magnifier upon one or two large convex lenses (of about five inches or upwards in diameter), at the end of a pyramidal shaped box, in a very pleas¬ ing and magnified appearance, so as to give opaque objects as well as transparent ones the utmost distinct¬ ness of representation 5 but still the light of a candle or lamp was found generally insufficient to throw the requisite degree of illumination upon the objects, ffhe invention of ivhat is called Argand's lamp, within these few years, offered a complete remedy for this defect, by the intensity and steadiness of its light. This did not escape Mr Adams (son of the former), who immedi¬ ately applied it; and who had likewise so altered and improved his father’s instrument, both in construction and form, as to render it altogether a different one, and far more perfect and useful. The advantages and properties of this excellent¬ ly conceived instrument are numerous and important. “ As the far greater part of the objects which sur¬ round us are opaque (says our author), and very few are sufficiently transparent to be examined by the com¬ mon microscopes, an instrument that could be readily- applied to the examination of opaque objects has al¬ ways been a desideratum. Even in the examination of transparent objects, many of the fine and more cu¬ rious portions are lost, and drowned, as it were, in the light which must be transmitted through them •, while different parts of the same object appear only as dark lines or spots, because they are so opaque as not to permit any light to pass through them. These diffi¬ culties, as well as many more, are obviated in the lu¬ cernal microscope ; by which opaque objects of vari¬ ous sizes may be seen with ease and distinctness : the beautiful colours with which most of them are adorn¬ ed, are rendered more brilliant, without changing in the least the real tint of the colour 3 and the concave and convex parts retain also their proper form.— 1 he facility with which all opaque objects are applied to this instrument, is another considerable advantage, and almost peculiar to itself 3 as the texture and configu¬ ration of the more tender parts are often hurt by pre¬ vious preparation, every object may be examined by this instrument, first as opaque, and afterwards (if the texture will admit of it) as transparent.—The lucer¬ nal microscope does not in the least fatigue the eye 3 the object appears like nature itself, giving ease to the sight and pleasure to the mind : there is also, in the use of this instrument, no occasion to shut the eye which is not directed to the object. A further ad¬ vantage peculiar to this microscope is, that by it the outlines of every object may be taken, even by those who are not accustomed to draw 3 while those who can draw well will receive great assistance, and execute their work with more accuracy and in less time than they would otherwise have been able to have perform¬ ed it. Transparent objects as well as opaque may be copied in the same manner. The instrument may be used at any time of the day, but the best effect is by night 3 in which respect it has a superiority over the solar microscope, as that instrument'can only be used when the sun shines. Transparent objects may be examined with the lu¬ cernal microscope in three or four different modes, from MIC [ i Micro- from a blaze of light almost too great for the eye to scope, bear, to that which is perfectly easy to it: And by * the addition of a tin lanthorn to the apparatus, may be thrown on a screen, and exhibited at one view to a large company, as by the solar microscope. We shall now proceed to the description of the in¬ strument and apparatus as given by Mr Adams. Plate Fig. 26. represents the improved Zz/cerwo/Afz’mwcqpe, CCCXLI. mounted to view opaque objects. ABCD is a large mahogany pyramidal box, which forms the body of the microscope j it is supported firmly on the brass pillar FG, by means of the socket H and the curved piece IK. LMN is a guide for the eye, in order to direct it in the axis of the lenses 5 it consists of two brass tubes, one sliding within the other, and a vertical flat piece, at the top of which is the hole for the eye. The outer tube is seen at MN, the vertical piece is represented at LM. The inner tube may be pulled out, or push¬ ed in, to adjust it to the focus of the glasses. The vertical piece may be raised or depressed, that the hole, through which the object is to be viewed, may coin¬ cide with the centre in the field of view j it is fixed by a milled screw from M, which could not be shown in this figure. At N is a dove-tailed piece of brass, made to re¬ ceive the dove-tail at the end of the tubes MN, by which it is affixed to the wooden box ABCDE. The tubes MN may be removed from this box occasionally, for the convenience of packing it up in a less com¬ pass. OP, a small tube which carries the magnifiers. O, one of the magnifiers •, it is screwed into the end of a tube, which slides within the tube P ; the tube P may be unscrewed occasionally from the wooden body. QRSTVX, a long square bar, which passes through the sockets YZ, and carries the stage or frame that holds the objects ; this bar may be moved backward or forward, in order to adjust it to the focus by means of the pinion which is at a. b, A handle furnished with an universal joint, for more conveniently turning the pinion. When the Fig. 27. handle is removed, the nut (fig. 27.) may be used in its stead. de, A brass bar, to support the curved piece KI, and keep the body AB firm and steady. fghi, The stage for opaque objects: it fits upon the bar QRST by means of the socket/zz, and is brought nearer to or removed farther from the magni¬ fying lens by turning the pinion a : the objects are placed in the front side of the stage (which cannot be seen in this figure) between four small brass plates ; the edges of two of these are seen at k L The two upper pieces of brass are moveable j they are fixed to a plate, which is acted on by a spiral spring, that presses them down, and confines the slider with the objects: this plate, and the two upper pieces of brass, are lifted up by the small nut m. At the lower part of the stage, there is a semicircu¬ lar lump of glass zz, which is designed to receive the light from the lamp, fig. 29. and to collect and throw it on the concave mirror 0, whence it is to be reflected on the object. The upper part fg hs (fig. 26.) of the opaque stage 4 ; ] MIC takes out, that the stage for transparent objects may Micro¬ be inserted in its place. scope. Fig. 28. represents the stage for transparent objects j ' j—y— the two legs 5 and 6 fit into the top of the under part i8' r s h z'of the stage for opaque objects j 7 is the part which confines or holds the sliders, and through which they are to be moved ; 9 and 10, a brass tube, which con¬ tains the lenses for condensing the light, and throwing it upon the object; there is a second tube within that, marked 9 and 10, which maybe placed at diflerent distances from the object by the pin it. When this stage is used as a single microscope, with¬ out any reference to the lucernal, the magnifiers or object lenses, are to be screwed into the hole 12, and to be adjusted to a proper focus by the nut 13. N.B. At the end x4B (fig. 26.) of the wooden body there is a slider, which is represented as partly drawn out at A : when quite taken out, three grooves will be perceived ; one of which contains a board that forms the end of the box ; the next contains a frame with a grayed glass ; and the third, or that farthest from the end AB, two large convex lenses. Fig. 29. represents one of Argand’s lamps, which Fig. 29. are most suitable for microscopic purposes, on ac¬ count of the clearness, the intensity, and the steadiness of the light. The following account of the method of managing them, with other observations, is copied from an account given by Mr Parker with those he sells. The principle on which the lamp acts, consists in disposing the w ick in thin parts, so that the air may come in contact with all the*burning fuel} by which means, together with an increase of the current of air occasioned by rarefaction in the glass tube, the whole « of the fuel is converted into flame. The wicks are circular j and, the more readily to regulate the quantity of light, are fixed on a brass col¬ lar, w'ith a wire handle, by means of which they are raised or depressed at pleasure. To fix the wick on, a wooden mandril is contrived, which is tapered at one end, anfl has a groove turned at the other. The wick has a selvage at one end, which is to be put foremost on the mandril, and moved up to the groove ; then putting the groove into the collar of the wick-holder, the wick is easily pushed forward upon it. The wick-holder and wick being put quite down in their place, the spare part of the wick should, while dry, be set a-light, and suffered to burn to the edge of the tubes 5 this will leave it more even than by cut¬ ting, and, being black by burning, will be much easier lighted : for this reason, the black should never be quite cut off. The lamp should be filled an hour or two before it is wanted, that the cotton may imbibe the oil and draw the better. The lamps which have a reservoir and valve, need no other direction for filling than to do it with a pro¬ per trimming pot, carefully observing when they are full; then pulling up the valve by the point, the re¬ servoir, being turned with the other hand, may be re¬ placed without spilling a drop. Those lamps which fill in the front like a bird-foun¬ tain, must be reclined on the back to fill; and this should MIC [i Micro- should be done gently, that the oil in the burner may scope, return into the body when so placed and filled : if, by ~v being too full, and oil appears above the guard, only move the lamp a little, and the oil will disappear j the lamp may then be placed erect, and the oil will flow to its proper level. The oil must be of the spermaceti kind, commonly called chamber oil, which may generally be distinguish¬ ed by its paleness, transparency, and inoffensive scent : all those oils which are of a red and brown colour, and of an offensive scent, should be carefully avoided, as their glutinous parts clog the lamp, and the impurities in such oil, not being inflammable, will accumulate and remain in the form of a crust on the wick. Seal oil is nearly as pale and sweet as chamber oil; but being ot a heavy sluggish quality, is not proper for lamps with fine wicks. Whenever bad oil has been used, on changing it, the w'ick must also be changed ", because, after having im¬ bibed the coarse particles in its capillary tubes, it will not draw up the fine oil. To obtain the greatest degree of light, the wick should be trimmed exactly even, the flame will then be completely equal. There will be a great advantage in keeping the lamp clean, especially the burner and air tubes 5 the neglect of cleanliness in lamps is too common : a candlestick is generally cleaned every time it is used, so should a lamp •, and if a candlestick is not to be objected to be¬ cause it docs not give light after the candle is^ ex¬ hausted, so a lamp should not be thought ill of, if it does net give light when it wants oil or cotton . but this last has often happened, because the deficiency is less * visible. . The glass tubes are best cleaned with a piece ol wash leather. If a fountain lamp is left partly filled with oil, it may be liable to overflow : this happens by the contraction of the air when cold, and its expansion by the warmth of a room, the rays of the sun, or the heat of the lamp when re-lighted : this accident may be effectually pre¬ vented by keeping the reservoir filled, the oil not being subject to expansion like air. On this account, those with a common reservoir are best adapted for microsco¬ pic purposes. To examine Opaque Objects, with the Lucernal Mu rroscope. To render the use of this instiument easy, it is usually packed with as many of the parts together as possible : it occupies on this account rather more room, but is much less embarrassing to the observer, who has only three parts to put on after it is taken out of its box, namely, the guide for the eye, the stage, and the tube with its magnifier. But to be more particular : Take out the wooden glider A (fig. 26.), then lift out the cover and the gray glass, from their respective grooves under the slider A. Put the end N of the guide for the eye LMN into its place, so that it may stand in the position which is represented in this figure. Place the socket which is at the bottom of the opaque stage, on the bar QXT, so that the concave mirror 0 may be next the end DE of the wooden body. I ] MIC Screw the tubes PO into the end DE. The mag- Micro- nifier you intend to use is to be screwed on the end O t scope. of these tubes. The handle G b, or the milled nut, fig. 27. must he placed on the square end of the pinion a. Place the. lamp lighted before the glass lamp n, and the object you intend to examine between the spring plates ol the stage j and the instrument is ready for use. In all microscopes there are two circumstances which must be particularly attended to: first, the modilica*- tion of the light, or the proper quantity to illuminate the object; secondly, the adjustment of the instrument to the focus of the glass and eye of the observer. In the use of the lucernal microscope there is a third cir¬ cumstance, which is, the regulation of the guide lor the eye. 1. To throw the light upon the object. The flume of the lamp is to be placed rather below the centre of the glass lump n, and as near it as possible ; the con¬ cave mirror '. must be so inclined and turned as to re¬ ceive the light from the glass lump, and reflect it thence upon the object j the best situation of the con¬ cave mirror and the flame of the lamp depends on a combination of circumstances, which a little practice will discover. 2. To regulate the guide for the eye, or to place the centre of the eye-piece L so that it may coincide with the focal point of the lenses and the axis of vision : Lengthen and shorten the tubes MN, by drawing out or pushing in the inner tube, and raising or depressing the eye-piece ML, till you find the large lens (which is placed at the end AB of the wooden body) filled by an uniform field of light, without any prismatic colours round the edge j for till this piece is properly fixed, the circle of light will be very small, and only occupy a part of the lens ; the eye must be kept at the centre of the eye-piece L, during the whole of the opera¬ tion ; which may be rendered somewhat easier to the observer, on the first use of the instrument, if he hold a piece of white paper parallel to the large lens, re¬ moving it from or bringing it nearer to them till he find the place where a lucid circle, which he will per¬ ceive on the paper, is brightest and most distinct ; then he is to fix the centre of the eye-piece to coincide with that spot *, after which a very small adjustment will set it perfectly right. 3. To adjust the lenses to their focal distance. This is effected by turning the pinion c, the eye being at the same time at the eye-piece L. The gray glass is often placed before the large lenses, while regulat¬ ing the guide for the eye, and adjusting for the focal distance. If the observer, in tbe process of his examination of an object, advance rapidly from a shallow to a deep magnifier, he will save himself some labour by pulling out the internal tube at O. The upper party*g r s oi the stage is to be raised or lowered occasionally, in order to make the centre of the object coincide with the centre of the lens at O. To delineate objects, the gray glass must be placed before tbe large lenses ; the picture of the object will be formed on this glass, and the outline may be accu¬ rately taken by going over tbe picture with a pencil. The ■ MIC [i Micro- The opaque part may be used ifc the daytime without scope, a lamp, provided the large lenses at AB are screened from the light. To use the Lucernal Microscope in the examination of Transparent Objects.—The instrument is to remain as before : the upper part f g s of the opaque stage must be removed, and the stage for transparent objects, re¬ presented at figi 28. put in its place} the end 9 10 to be next the lamp. Place the grayed glass in its groove at the end AB, and the objects in the slider-holder at the front of the stage } then transmit as strong a light as you are able on the object, which you will easily do by raising or lowering the lamp. The object will be beautifully depicted on the gray glass } it must be regulated to the focus of the magni¬ fier, by turning the pinion a. The object may be viewed either with or without the guide for the eye. A single observer will see an object to the greatest advantage by using this guide, which is to be adjusted as we have described above. If two or three wish to examine the object at the same time, the guide for the eye must be laid aside. Take the large lens out of the groove, and receive the image on the gray glass } in this case, the guide for the eye is of no use : if the gray glass be taken away, the image of the object may be received on a paper screen. Take out the gray glass, replace the large lenses, and use the guide for the eye } attend to the forego¬ ing directions, and adjust the object to its proper fo¬ cus. You will then see the object in a blaze of light almost too great for the eye, a circumstance that will be found very useful in the examination of particular objects. The edges of the object in this mode will be somewhat coloured : but as it is only used in this full light for occasional purposes, it has been thought bet¬ ter to leave this small imperfection, than, by remedying it, to sacrifice greater advantages} the more so, as this fault is easily corrected, a new and interesting view of the object is obtained, by turning the instrument out of the direct rays of light, and permitting them to pass through only in an oblique direction, by which the upper surface is in some degree illuminated, and the object is seen partly as opaque, partly as transpar¬ ent. It has been already observed, that the transparent objects might be placed between the slider-holders of the stage for opaque objects, and then be examined as if opaque. Some transparent objects appear to the greatest ad¬ vantage when the lens at 9 1 o is taken away } as, by giving too great a quantity of light, it renders the edges less sharp. The variety of views which may be taken of every object by means of the improved lucernal microscope, will be found to be of great use to an accurate observ¬ er : it will give him an opportunity of correcting or Vol. XIV. Part I. + 7 ] MIC confirming his discoveries, and investigating those parts ^Micro- in one mode which are invisible in another. , sc0Pc- To throw the image of transparent objects on a screen v~~“ as in the solar microscope.—It has been long a microsco¬ pical desideratum, to have an instrument by which the image of transparent objects might be thrown on a screen, as in the common solar microscope: and this not only because the sun is so uncertain in this cli¬ mate, and the use of the solar microscope requires confinement in the finest part of the day, when time seldom hangs heavy on the mind} but as it also affords an increase of pleasure, by displaying its wonders to several persons at the same instant, without the least fatigue to the eye. This purpose is now effectually answered, by affix¬ ing the transparent stage of the lucernal to a lanthorn, with one of Argand’s lamps.—The lamp is placed within the lanthorn, and the end 9 10 of the trans¬ parent stage is screwed into a female screw, which is rivetted in the sliding part of the front of the lan¬ thorn } the magnifying lenses are to be screwed into the hole, represented at 12, and they are adjusted by turning the milled nut. The quantity of light is to be regulated by raising and lowering the sliding-plate or the lamp, Apparatus which usually accompanies the improved Lucernal Microscope.—The stage for opaque objects, with its semicircular lump of glass, and concave mirror. The stage for transparent objects, which fits on the upper part of the foregoing stage. The sliding tube, to which the magnifiers are to be affixed : one end of these is to be screwed on the end D of the wooden body} the magnifier in use is to be screwed to the other end of the inner tube. Eight magnifying lenses : these are so constructed that they may be combined together, and thus produce a very great variety of magnifying powers. A fish-pan, such as is represented at I. A steel wire L, with a pair of nippers at one end, and a small cylinder of ivory / at the other. A slider of brass N, containing a flat glass slider, and a brass slider into which are fitted some small concave glasses. A pair of forceps. Six large and six small ivory sliders, with transparent objects. Fourteen wooden sliders, with four opaque objects in each slider} and twro spare sliders. Some capillary tubes for viewing small animalcula. Ingenious men seldom content themselves with an instrument under one form; hence such a variety of microscopes, hence many alterations in the Lucernal Microscope. Mr Adams himself, we understand, has fitted up this last in a great many different ways ; and it is reasonable to think that no person was more likely to give it every improvement of which it is susceptible. Of the alterations by other hands we shall only parti¬ cularize one, made by Mr Jones of Holborn (b), whose description is as follows : A (fig. 30.) represents a portion of the top of the ma-Fig 30. C hogany (b) We trust the reader wall never consider any paragraph wherein the name of an instrument-maker or other artist is inserted, as a recommendation of those artists by the editors of this work. In the course of a pretty extensive correspondence, they have been favoured with very liberal communications from various ajrtists, for which they are greatly indebted to them: the inserting their names in this wox*k is therefore to be considered as M I C Micro- fiogany box in which it packs, to pi'eservc it steady 5 it scope, slides in a dove-tail groove withinside, a similar groove to which is cut in the top of the box A ; so that when the instrument is to be used, it is sbpt out of the box withinside, and then slipt into the groove at top ready for use, almost instantly, as shown in the figure. The adjustment of the objects is at the stage li •, for the right focal distance is readily and conveniently made by turning the long screw-rod BB, which goes through the two pillars supporting the box, and w'orks in the base of the brass stage E j which base is also dove¬ tailed, so as to have a regular and steady motion in an¬ other brass basis that supports it. In this instrument, therefore, the nyramidical box does not move ; but the stage part only, which, from its small weight, moves in the most agreeable and steady manner. While observing the image of the object upon the glass through the sight-hole at G, the object may be moved or changed by only turning the rack-work and pinion applied to the stage by means ol the handle I), lor that purpose. By this contrivance you have no occa¬ sion to change your position during the view of the objects upon one of the sliders. T his motion changes the objects horizontally only *, and as they are gene¬ rally placed exactly in one line, it answers all the pur¬ poses for which this motion is intended very well. But it may sometimes happen that the observer would wish to alter the vertical position of the object; to perform which there is another plain rod at I, that acts simply as a lever for this purpose, and moves the sliding part of the stage E vertically either upwards or downwards. Thus, without altering his position, the observer may investigate all parts of the objects in the most sa¬ tisfactory manner. Back-work and pinion might be applied to the stage for the vertical motion also * but as it would materially enhance the expence, it is seldom applied. The brass work at the handle of D contains a Hooke’s universal joint. The brilliancy of the images of the objects shown upon the large lenses at the end of the box, being very frequently so great as to dazzle the eyes, Mr Jones ap¬ plies a slight tinge of blue, green, and other coloured glass, to the sight-hole at G, which softens this glare, and casts an agreeable hue upon the objects. Description of those Parts of a Microscopical Appa¬ ratus, common to most Instruments, which are de¬ lineated at fig. 31. A and B represent the brass cells which contain the magnifiers belonging to the 'diflerent kinds of com¬ pound microscopes. The magnifiers are sometimes contained in a slider like that which is delineated at S (fig. 24.). The lenses of A and B are confined by a small cap j on unscrewing this, the small lens may be taken out and cleaned. The magnifiers A of the lu- cernal microscope are so contrived, that any two of M I C them may be screwed together, by which means a con- Micro- siderable variety of magnifying powers is obtained. scope To get at the lenses in the slider S (fig. 24.) take "" out the two screws winch hold on the cover. C represents the general form of the slider-holder. It consists of a cylindrical tube, in which an inner tuoe is forced up by a spring. It is used to receive the ivory or any other slider, 111 which the transparent ob¬ jects are placed j these are to be slid between the t'.vo upper plates: the hollow part in one of the plates is de¬ signed for the glass tubes. II, the condensing lens and its tube, which fits into the slider-holder C, and may be moved up and down in it. When this piece is pushed up as far as it will go, it condenses the light of a candle, which is reflect¬ ed on it bv the plain mirror of the compound micro¬ scope, and spreads it uniformly over the object ; in this case it is best adapted to the shallowest magnifiers. If the deeper lenses are used, it should be drawn down, or rather removed further from the object, that it may concentrate the light in a small compass, and thus render it more dense. The condensing lens is some¬ times fitted up differently *, but the principle being the same, it will be easy to apply it to use notwithstanding some variations in the mechanism. E, a brass cone. It fixes under the slider-holder, and is used to lessen occasionally the quantity of light winch comes from the mirror to any object. F, a box with two flat glasses, which may be placed at different distances from each ether in order to con¬ fine a small living insect. G, a small brass box to hold the silver speculum H. H, a small silver concave speculum, designed to re¬ flect the light from the mirror on opaque objects y it should only be used with the shallow magnifiers. It is applied in different ways to the compound microscope y sometimes to a tube similar to that represented at X, which slides on the lower part of the body j sometimes it is screwed into the ring of the jnece Q } the pin of this generally fits into one of the holes in the stage. When this speculum is used, the slider-holder should be removed. I, a fish-pan, whereon a small fish may be fastened, in order to view the circulation of the blood : its tail is to be spread across the oblong hole at the smallest end, and tied fast by means of the ribbon fixed there¬ to, by shoving the knob which is on the back of it through the slit made in the stage •, the tail of the fish may be brought under the lens which is in use. K, a cylindrical piece, intended for the solar opaque microscope ; by pulling back the spiral spring, smaller or larger objects may be confined in it. -» k, A pair of triangular nippers for taking hold of and confining a large object. L, a long steel wire, with a small pair of pliers at one end and a steel point at the other: the wire slips backwards or forwards in a spring tube, which is af¬ fixed to a joint, at the bottom of which is a pin to fit one [ 18 3 as a grateful acknowledgment from the editors for favours conferred on them,—not as a testimonial of their opi¬ nion of the abilities of an individual, or as designed to insinuate any preference over others in the same line, where such preference has not been already bestowed by the public. MIC [ 19 ] MIC one of the holes In the stage ; this piece is used to con¬ iine small objects. /, A small ivoi ¥ cylinder that fits on the pointed end of the steel wire L ; it is designed to receive opaque objects. Light-coloured ones are to be stuck on the dark side, and vice vet'sa. M, a convex lens, which iits to the stage by means of the long pin adhering to it. This piece is designed to collect the light from the sun or a candle, and to throw them on any object placed on the stage j but it is very little used at present. N, a brass slider, into which is fitted a flat piece of glass, and a brass slider containing four small glasses, one or two of them concave, the others flat; it is de¬ signed to coniine small living objects, and when used is to be placed between the two upper plates of the slider- holder. O, a glass tube to receive a small fish, &c. P, represents one of the ivory sliders, wherein ob¬ jects are placed between two pieces of talc, and con¬ fined by a brass ring. Q, a piece to hold the speculum II : this piece is ge¬ nerally fitted to the microscope represented at fig. 12. R, a pair of forceps, to take up any occasional ob- jfet- S, a camel’s hair pencil to brush the dust off the glasses 5 the upper part of the quill is scooped out, to take np a drop of any fluid, and place it on either of the glasses for examination. T, an instrument for cutting thin transverse sections of wood. It consists of a wooden base, which supports four brass pillars j on the top of the pillars is placed a flat piece of brass, near the middle of which there is a triangular hole. A sharp knife, which moves in a diagonal direction, is fixed on the upper side of the afore-mentioned plate, and in such a iftanner that the edge always coincides with the surface thereof. The knife is moved backwards and forwards by means of the handle a. The piece of wood is placed in the triangular trough which is under the brass plate, and is to be kept steady therein by a milled screw which is fitted to the trough 5 the wood is to be pressed forward for cutting by the micrometer screw b. The pieces of wood should be applied to this in¬ strument immediately on being taken out of the ground, or else they should be soaked for some time in Water, to soften them so that they may not hurt the edge of the knife. When the edge of the knife is brought in contact with the piece of wood, a small quantity of spirits of wine should be poured on the surface of the Wood, to prevent its curling up ; it will also make it adhere to the knife, from which it may be removed by pressing a piece of blotting paper on it. y, An appendage to the cutting engine, which is to be used instead of the micrometer screw, being prefer¬ red to it by some. It is placed over the triangular hole, and kept flat down upon the surface of the brass plate, while the piece of wood is pressed against a cir¬ cular piece of brass which is on the under side of it. This circular piece of brass is fixed to the screw, by which its distance from the flat plate on which the knife moves may be regulated. 2;, An ivory box, containing at one end spare talc Micro- for the ivory slider, and at the other spare rings for scope, pressing the talcs together and confining them to the slider. Fluid microscopes have been also proposed j the first, it would appear, was suggested by Mr Grey. This was formed of water, and an account of it will be found in N° 221, 223, Phil. Trans. An improved microscope, on a similar principle, has been invented by Mr Brew¬ ster-, of which the following is a description, taken from a note by the translator of Haiiy’s Natural Phi¬ losophy. “ A vertical bar (says Mr Gregory), is fixed upon a horizontal pedestal; and from the top of this bar proceeds a horizontal arm, which supports a circular case containing the lenses } below this another horizon¬ tal arm slides up and down, capable of adjustment by means of a screw, and carrying the usual sliders to hold the object which it is proposed to examine j and upon the pedestal is fixed the frame of a mirror, which has both an inclined and a horizontal motion, in order to illuminate any object upon the slider. The upper cir¬ cular case is hollow, and contains four or more plano¬ convex lenses, which are constituted each of a drop of very pure and viscid turpentine varnish, taken Up by the point of a piece of wood, and dropped upon a piece of very thin and well polished glass. The lenses thus formed may be made of any focal length by taking up a greater or a less quantity of fluid. The lower surface of the glass having been first smoked with a candle, the black pigment immediately below the lenses is then to be removed, so that no light may pass but through the lenses. The piece of glass is then perforated at its centre, and surrounded by a toothed wheel, which, when the wheel is put in the upper circular screw, may he turned by a common endless screw, so that the fluid lenses shall be brought severally under an eye-aperture properly disposed, and any object be successfully exa¬ mined with a variety of magnifying powers.” Note, p. 365. Sec also Ferguson’s Lectures by Brewster, vol. ii. After what has been related of microscopes, they cannot be said to be complete without the valuable ad¬ dition of a micrometer ; for the use and advantages of which, see the article MICROMETER. Having presented our readers with descriptions of the various microscopes generally used, we think it tmr duty to point out to them those which we conceive to be best calculated to answer the purposes of science. The first which presents itself to our mind is that of Ellis : It is better adapted than any other portable mi¬ croscope, to the purpose of general observation $ simple in its construction, and general in its application. To those who prefer a double microscope, we should reccm- mend that figured in Plate CCCXXXVIII. fig. 12. If opaque objects, as insects, &c. be subjects of inves¬ tigation, the Lucernal Microscope claims the preference ; hut if amusement alone guides the choice, the Solar Microscope must be fixed upon. We shall now proceed to explain some necessary par¬ ticulars respecting the method of using microscopes j after which, we shall subjoin an enumeration of the prin- C 2 cipa] MIC [ 20 ] MIC cipal objects discovered or elucidated by their means, contracted by dryness, or m any manner out of a na- Micro- On this subject Mr Adams, in his Essaij on the Micro- tural state, without making suitable allowances. 1 ie t |SC(^‘- scope, has been very copious ; with a view, as he in- true colour of objects cannot be properly determined forms us, to remove the common complaint made by by very great magnifiers j for as the pores and interstices Mr Baker, “ that many of those who purchase micro- of an object are enlarged according to the magnifying scopes are so little acquainted with their general and power of the glasses made use of, the component parti- extensive usefulness, and so much at a loss for objects cles of its substance will appear separated many tbou- to examine by them, that after diverting their friends sand times farther asunder than they do to the naked some few times with what they find in the sliders eye : hence the reflection of the light from these parti- which generally accompany the instrument, or perhaps cles will be very different, and exhibit different colours, with two or three common objects, the microscope is It is likewise somewhat difficult to observe opaque ob- laid aside as of little further value : whereas no instru- jects ; and as the apertures of the larger magnifiers are ment has yet appeared in the world capable of affording but small, they are not proper for the purpose. It an so constant, various, and satisfactory an entertainment object be so very opaque, that no light will pass through to the mind.” ^ as mucl1 as Poss*ble niust be tbro'vn uPon tbe UP" I. In using the microscope, there are three things per surface of it. Some consideration is likewise ne- necessary to be considered. (l.) The preparation and cessary in forming a judgment of the motion of living adjustment of the instrument itself. (2.) The proper creatures, or even ot fluids, when seen through the quantity of light, and the best method of directing microscope •, for as the moving body, and the spate it to the object. (3.) The method of preparing the wherein it moves, are magnified, the motion will also objects, so that their texture may be properly under- be increased. s^of)t| 2. On the management of the light depends in a I. With reo-ard to the microscope itself, the first great measure the distinctness of the vision : and as, in thin'er necessary to be examined is, whether the glasses order to have this in the greatest perfection, we must be clean or not : if they are not so, they must be wiped adapt the quantity of light to the nature of the object with a piece of soft leather, taking care not to soil and the focus of the magnifier, it is therefore neces- them afterwards with the fingers > and, in replacing sary to view it in various degrees of light. In some them, care must be taken not to place them in an ob- objects, it is difficult to distinguish between a pronn- lique situation. We must likewise be careful not to nence and a depression, a shadow or a black stain : or let the breath fall upon the glasses, nor to hold that between a reflection of light and whiteness, which is part of the body of the instrument where the glasses are particularly observable in the eye of the hbellula and placed with a warm hand} because thus the moisture other flies : all of these appearing very different m one expelled by the heat from the metal will condense upon position from what they do in another. The bright- the glass, and prevent the object from being distinctly ness of an object likewise depends on the quantity of seen. The object should be brought as near the centre light, the distinctness of vision, and on regulating the of the field of view as possible; for there only it will quantity to the object; for some will be in a manner be exhibited in the greatest perfection. The eye should lost in a quantity of light scarcely sufficient to render be moved up and down from the eye-glass, of a com- another visible. pound microscope, till the situation is found where the There are various ways in which a strong light may largest field and most distinct view of the object are to be thrown upon objects 5 as by means of the sun and be had : but every person ought to adjust the micro- a convex lens. For this purpose, the microscope is scope to his own eye, and not "to depend upon the situa- to be placed about three feet from a southern window j tion it was placed in by another. A small magnifying then take a deep convex lens, mounted on a semicircle power should always be begun with ; by which means and stand, so that its position may easily be varied : . the observer will best obtain an exq/ct idea of the situa- place this lens between the object and the window, so tion and connexion of the whole 5 and will of conse- that it may collect a considerable number of solar rays, quence be less liable to form any erroneous opinion and refract them on the object or the mirror of the when the parts are viewed separately by a lens of greater microscope. If the light thus collected from the sun power. Objects should also be examined first in their be too powerful, it may be lessened by placing a piece most natural position : for if this be not attended to, we of oiled paper, or a piece of glass lightly grayed, be- shall be apt to form very inadequate ideas of the struc- tween the object and lens. Thus a proper’ degree of ture of the whole, as well as of the connexion and use light may be obtained, and diffused equally all over of the parts. A living animal ought to be as little hurt the surface of an object: a circumstance which ought or discomposed as possible. to be particularly attended to 5 for if the light be From viewing an object properly, we may acquire a thrown irregularly upon it, no distinct view can be knowledge of its nature: but this cannot be done with- obtained. If we mean to make use of the solar light, out an extensive knowledge of the subject, much pa- it will be found convenient to darken the room, and tience, and many experiments •, as in a great number to reflect the rays of the sun on the above-mentioned of cases the images wall resemble each other, though lens by means of the mirror of a solar microscope fix- derived from very different substances. Mr Baker ed to the window-shutter : for thus the observer will therefore advises us not to form an opinion too suddenly be enabled to preserve the light on his subject, notwith- after viewing a microscopical object *, nor to draw our standing the motion of the sun. But by- reason of this inferences till after repeated experiments and examina- motion, and the variable state of the atmosphere, so- tions of the object in many different lights and positions j lar-observations are rendered both tedious and incon- t© pass no judgment upon things extended by force, or venient: whence it will be proper for the observer to bs.- MIC [2 Mlcro- be furnished with a large tin lauthorn, formed some- scope. thing like the common magic lanthorn, capable ot containing one of Argand’s lamps. This, however, ought not to be of the fountain kind, lest the rarefac¬ tion of the air in the lanthorn should force the oil over. There ought to be an aperture in the front of the lanthorn, which may be moved up and down, and be capable of holding a lens ; by which means a pleasant and uniform as well as strong light may easily be pro¬ cured. The lamp should likewise move on a rod, so that it may be easily raised or depressed. 'Ibis lan¬ thorn may likewise be used for many other purposes ; as viewing of pictures, exhibiting microscopic objects on a screen, &c. A weak light, however, is best lor viewing many transparent objects : among which we may reckon the prepared eyes of flies, as well as the animalcules in fluids. The quantity of light from a lamp or candle may be lessened by removing the mi¬ croscope to a greater distance from them, or by dimi¬ nishing the strength of the light which falls upon the objects. This may very conveniently be done by pieces of black paper with circular apertures of diflei- ent sizes, and placing a larger or smaller one upon the reflecting mirror, as occasion may require. Tdiere is an oblique situation of the mirrors, which makes like¬ wise an oblique reflection of the light easily discovered by practice, (but for which no general rule can be giv¬ en in theory) } and which will exhibit an object more distinctly than any other position, showing the surface, as well as those parts through which the light is trans¬ mitted. The light of a lamp or candle is generally better for viewing microscopic objects than day light j it being more easy to modify the former than the lat¬ ter, and to throw it upon the objects with different de¬ grees of density. 3. Swammerdam has excelled in the preparation of objects almost all other investigators. Neither difficulty nor disappointment could make him abandon the pur¬ suit of any object until he had obtained a satisfactory idea of it. But unhappily the methods he used in pre¬ paring his objects for the microscope are now entirely un¬ known. Boerhaave examined with the strictest atten¬ tion all the letters and manuscripts of Swammerdam which he could find but his researches were far from being successful. T-he following are all the particulars, which have thus come to the knowledge of the pub¬ lic. For dissecting small insects, Swammerdam had a brass table made by S. Muschenbroeck, to which were affixed two brass arms moveable at pleasure to any part of it. The upper part of these vertical arms was con¬ structed in such a manner as to have a slow vertical motion ; by which means the operator could readily alter their height as he saw convenient. One of these arms was to hold the minute objects, and the other to apply the microscope. The lenses of Swammerdam’s microscopes were of various sizes as well as foci: but all of them the best that could be procured, both for the transparency of the glass and the fineness of the workmanship. His observations were always begun with the smallest mag¬ nifiers, from which he proceeded to the greatest 5 but in the use of them, he was so exceedingly dexterous, that he made every observation subservient to that which succeeded it, aud all of them to the coiffinnation of, i ] M I C each other, and to the completing of the description. Micro- His chief art seems to have been in constructing scis- scope, sars of an exquisite fineness, and making them very sharp. Thus he was enabled to cut very minute ob¬ jects to much more advantage than could be done by knives and lancets j for these, though ever so sharp and fine, are apt to disorder delicate substances by dis¬ placing some of the filaments, and drawing them af¬ ter them as they pass through tlie bodies ; but the scissars cut them all equally. 1 he knives, lancets, and styles he made use of in his dissections, were so fine that he could not see to sharpen them without the assistance of a magnifying glass; but with these he could dissect the intestines of bees with the same ac¬ curacy that the best anatomists can do those of large animals. He made use also of very small glass tubes no thicker than a bristle, and drawn to a very fine point at one end, but thicker at the other. These M'ere for the purpose of blowing up, and thus render¬ ing visible, the smallest vessels which could be discover¬ ed by the microscope ; to trace their courses and com¬ munications, or sometimes to inject them with coloured liquors. Swammerdam sometimes made use of spirit of wine, water, or oil of turpentine, for suffocating the insects he wished to examine 5 and would preserve them for a time in these liquids. Thus he kept the parts from putrefying, and gave them besides such additional strength and firmness, as rendered the dissections much more easy than they would otherwise have been. Hav¬ ing then divided ’ the body transversely with the scissars, and made what observations he could with¬ out farther dissection, he proceeded to extract the intestines carefully with very fine instruments, to wash away the fat m the like careful manner j and thus to put the parts into such a state as would best expose them to view ; but these operations are best performed while the insects are in their nympha ; state. Sometimes the delicate viscera of the insects, after having been suffocated as above mentioned, were put into water: after which, having shaken them gently, he procured an opportunity of examining them, espe¬ cially the air vessels, which last he could thus separate entire from all the other parts, to the admiration of all who beheld them: as these vessels cannot be di¬ stinctly seen in any other manner, or indeed in any way whatever, without injuring them. Frequently al¬ so he injected water with a syringe to cleanse the parts thoroughly, alter which he blewr them up with air and dried them •, thus rendering them durable, and fit for examination at a proper opportunity. Sometimes he made very important discoveries* by examining insects which he had preserved for several years in balsam. Other insects he punctured with a very fine needle } and after squeezing out all their moisture through the holes made in this manner, he filled them with air, by means of very slender glass tubes j then dried them in the shade 5 and lastly, anointed them with oil of spike in which a little rosin had been dissolved j and by which means they for a long time retained their pro¬ per forms. He was likewise in possession of a singular secret, by which he could preserve the limbs of insects as limber and perspicuous as ever they had been. He used to make a small puncture or incision in the tails of worms j MIC [2 worms •, and after having with great caution squeezed out all the humours, as well as great part, of the viscera, he injected them with wax in such a manner as to give them the appearance of living creatures in perfect heath. He found that the fat of all insects was entire¬ ly dissolvable in oil of turpentine by which means he was enabled plainly to discern the viscera; though, after this dissolution, it was necessary to cleanse and wash them frequently in clean water. In this manner he would frequently have spent whole days in the prepara¬ tion of a single caterpillar, and cleansing it from its fat, in order to discover the true situation of the insect’s heart. He had a singular dexterity in stripping oil the skins of caterpillars that were on the point of spinning their cones. This was done by letting them drop by their threads into scalding water, and then suddenly withdrawing them. Thus the epidermis peeled off very easily 5 and, when this was done, he put them into distilled vinegar and spirit of wihe mixed together in equal proportions 5 Which, by giving a due degree of firmness to the parts, gave him an opportunity of separating them with very little trouble from the exu¬ viae, without any danger to the internal parts. Thus the nympha could be shown to be wrapped up in the caterpillar and the butterfly in the nympha; and there is little doubt that those who look into the works of Swammerdam, will be amply recompensed, whether they consider the unexampled labour or the piety of the author. M. Lyonet, an eminent naturalist, usually drotvned the insects he designed to examine •, by which means he was enabled to preserve both the softness and transparen¬ cy of the parts. According to him, the insect, if very small, viz. one-tenth of an inch, or little more, in length, should be dissected on a glass somewhat concave. If it should he suspected that the insect will putrefy by keeping for a few days, spirit of wine diluted with w7ater must be substituted instead of pure Water. The insect must be suffered to dry; after which it may be fastened by a piece of soft Wax, and again covered with water.—Larger objects should be placed in a trough of thin wood ; and for this purpose the bottom of a common chip box will answer very Well } only surrounding the edge of it ■with soft wax, to keep in the water or other fluid employed in preserving the in¬ sect. The body is then to be opened : and if the parts are soft like those of a caterpillar, they should be turn¬ ed back, and fixed to the trough by small pins, which ought to be set by a small pair of nippers. At the same time, the skin being stretched by another pair of finer forceps, the insect must be put into water, and dissected therein, occasionally covering it with spirit of wine. Thus the subject will be preserved in per¬ fection, so that its parts may be gradually unfolded, no other change being perceived than that the soft elastic parts become stiff and opaque, while seme others lose their colour. The following instruments were made use of by M. Lyonet in his dissection of the Chenille tie Saule. A pair of scissars as small as could be made, with long and fine arms : A pair of forceps, with their ends so nicely adjusted, that they could easily lay hold of a spider’s thread, or a grain of sand : Two fine steel needles fixed ;n wooden handles, about two inches and three quarters 2 j MIC in length j which were the most generally useful instiu- Mure, ments he employed. scope. Dr Hooke, who likewise made many microscopic '■“—v*—5- ohse’-vations, takes notice, that the common ant or pismire is much more troublesome to draw than other insects, as it is extremely difficult to get the body in a quiet natural posture. If its feet be fettered with wax or glue, tvhile the animal remains alive, it so twists its body, that there is no possibility of gaining a proper view of it •, and if it be killed before any observation is made, the shape is often spoiled before it can be exa¬ mined. The bodies of many minute insects, when their life is destroyed, instantly shrivel up ; and this is ob¬ servable even in plants as well as insects, the surface of these small bodies being affected by the least change of airj which is particularly the case with the ant. If this creature, however, be dropped into rectified spirit of wine, it Will instantly be killed ; and when it is ta¬ ken out, the spirit of wine evaporates, leaving the ani¬ mal dry, and in its natural posture, or at least in such a state, that it may easily be placed in whatever pos¬ ture we please. Parts of Insects. The wings, in many insects, are so transparent, that they require no previous preparation : but some of those that are folded up under elytra or cases, require a considerable share of dexterity to unfold them ; for these wings are naturally endowed with such a spring, that they immediately fold themselves again, unless care he taken to prevent them. The wing of the earwig, when expanded, is of a tolerable size, yet is folded up under a case not one-eighth part of its bulk 5 and the texture of this wing renders it difficult to be unfolded. This is do tie with the least trouble immediately after the insect is killed. Holding then the creature by the thorax, between the finger and the thumb, with a blunt-pointed pin endeavour gently to open it, by spreading it over the forefinger, and at the same time gradually sliding the thumb over it. W hen the wing is sufficiently expanded, separate it from the insect by a sharp knife or a pair of scissars. The wing should be pressed for some time between the thumb and finger before it be removed 5 it should then he placed between two pieces of paper, and again pressed for at least an hour, after which time, -as there will be no danger of its folding up any more, it may he put between the talcs, and applied to the microscope. Similar care is requisite in displaying the wings of the notonecta and other water insects, as well as most kinds of grylli. The minute scales or feathers, which cover the wings of moths or butterflies, afford very beautiful ob¬ jects for the microscope. Those from one part of the wing frequently difl’er in shape from such as are taken from other parts *, and near the thorax, shoulder, and on the fringes of the wings, wre generally meet with hair instead of scales. The whole may be brushed off the wing, upon a piece of paper, by means of a camel’s hair pencil ; after which the hairs can be separated with the assistance of a common magnifying glass. It is likewise a matter of considerable difficulty to dissect properly the pi'oboscis of insects, such as the gnat, tabanus, &c. and the experiment must be repeat¬ ed a great number of times before the structure and si¬ tuation M I C T 23 ] MIC ■Mirro- tuation of the parts can he thoroughly Investigated, as scope- ^,e observer will frequently discover in one what he could not in another. The collector of the bee, which forms a very curious object, ought to be first carefully washed in spirit of turpentine j by which means it will be freed from the unctuous matter adhering to it : when dry, it is again to he washed with a camel’s hair- pencil to disengage and bring forward the small hairs which form part of this microscopic beauty. The best method of managing the stings of insects, which are in danger of being broken by reason of their hardness, is to soak the case and the rest of the apparatus for some time in spirit of wine or turpentine ; then lay them on a piece of paper, and with a blunt knife draw out the sting, holding the sheath with the nail of the finger or any blunt instrument; but great cai*e is necessary to pre¬ serve the feelers, which when cleaned add much to the beauty of the object. The beard of the lepas anatifera is to he soaked in clean soft water, frequently brushing it while wet with a camel’s hair pencil : after it is dried, the brushing must be repeated with a dry pencil to disengage and separate the hairs, which are apt to adhere together. To view to advantage the, fat, brains, and other si¬ milar substances, Dr Hooke advises to render the sur¬ face smooth, by pressing it between two plates of thin glass, by which mean's the matter will be rendered much thinner and more transparent: without this pre¬ caution, it appears confused, by reason of the parts lying too thick upon one another. Yov muscular fibres, take a piece of the flesh, thin and dry ; moisten it with warm water, and after this is evaporated the vessels will appear more plain and distinct; and by repeated macerations they appear still more so. The exuviae of insects aft’ord a pleasing object, and require hut little preparation. If bent or cux-led up, they will become so relaxed by being kept a few hours in a moist atmosphere, that you may easily extend them to their natural po¬ sitions ; or the steam of warm water will answer the purpose very well. The-eyes of insects in general form very curious and I beautiful objects. Those of the libellula and other flies, as well as of the lobster, &c. must first be cleaned from L the blood, &c. after which they should he soaked in water for some days : one or two skins are then to be separated from the eye, which would be otherwise too opaque and confused; but some care is requisite in this operation; for if the skin he rendered too thin, it is impossible to form a proper idea of the organization of the part. In some substances, however, the organiza¬ tion is such, that by altering the texture of the part, we destroy the objects which we wish to observe. Of this sort are the nerves, tendons, muscular fibres, many of which are viewed to most advantage when floating in some transparent fluid. Thus very few of the muscular fibres can be discovered when we attempt to view them in the open air, though great numbers may be seen if they be placed in water or oil. By viewing the I thread of a ligament in this manner, we find it com¬ posed of a vast number of smooth round threads lying close together. Elastic objects should be pulled or stretched out while they are under the microscope, that the texture and nature of those parts, the figure of which is altered by being thus pulled out, may be more fully discovered. Other objects. To examine tawes by the microscope, Micro- they should first be viewed as opaque objects : hut af- scope, tevwards, by procuring thin slices of them, they may *—~v— be viewed as transparent. The sections should be cut in all directions, and be well washed and cleaned; and in some cases maceration will be useful, or the bones may he heated red hot in a clear fire, and then taken out; by which means the bony cells will appear more conspicuous. The pores of the skin may be examined In- cutting oft’ a thin slice of the upper skin with a razor, and then a second from the same place ; applying the latter to the microscope. The lizard, guana, &c. have two skins, one very transparent, the other thicker and more opaque ; and, separating these two, you obtain very beautiful objects. To view the scales of fish to advantage, they ought to be soaked in water for a few days, and then care¬ fully rubbed to clean them from the skin and dirt which may adhere to them. The scales of the eel are a great curiosity; and the more so, as this creature was not known to have any scales till they were disco¬ vered by the microscope. The method of discovering them is this. Take a piece of the skin of an eel from oil’ its side,- and spread it while moist on a piece of glass, that it may dry very smooth : when thus dried, the surface will appear all over dimpled or pitted by the scales, which lie under a sort of cuticle or thin skin ; which may be raised with the sharp point of a penknife, together with the scales, which will then easily slip out; and thus we may procure as many as we please. The leaves of many trees, as well as of some plants, when dissected, form a very agreeable object. In or¬ der to dissect them, take a few of the most perfect leaves you can find, and place them in a pan with clean water. Let them remain there three weeks, or a month, without changing the water: then take them up ; and if they feel very soft, and almost rotten, they are sufficiently soaked. They must then be laid on a flat hoard, and holding them by the stalk, draw the edge of a knife over the upper side of the leaf, which will take off most of the skin. Then turn the leaf, and do the same with the under side ; and when the skin is taken off on both sides, wash out the pulpy matter, and the fibres will be exhibited in a very beautiful man¬ ner. The leaf may be slit into two parts, by split¬ ting the stalk ; and the skins peeled from the fibres will also make a good object. This operation is best performed in the autumn; the fibres of the leaves are much stronger at that season, and less liable to be broken The internal structure of shells may be ob¬ served by grinding them down on a hone : and all ores and minerals should he carefully washed and brushed with a small brush, to remove any sordes that may ad¬ here to them. To view the circulation of the blood, we must ob¬ serve living animals of the most transparent kind.— A small eel is sometimes used for this purpose ; in which case it must be cleansed from the slime naturally adhering to it; after which it may be put into a tube filled with water, were it can he viewed in a satis¬ factory manner. The tail of any other small fish may he viewed in the same manner, or put upon a slip oi flat glass, and thus laid before the microscope. By filling the tube with water when an eel is made use oi, we MIC [ Micro- we prevent in a great measure the sliminess ot the scope, animal from soiling the glass, v The particles of the blood form a very curious ob¬ ject, and have been carefully viewed by different phi¬ losophers } \vho, nevertheless, differ from one another Very much in their accounts of them. Ibe best method of viewing these is to take a small drop of blood when warm, and spread it as thin as possible upon a flat piece ot glass. By diluting it a little with warm water, some of the large globules will be ■separated from the smaller, and many of them subdivid¬ ed j or a small drop of blood may be put into a ca¬ pillary glass tube, and then placed before the micro- ■scope. Mr Baker advises warm milk as proper to be mixed with the blood j but Mr Hewson diluted the blood with its own serum: and by this method he could preserve the small particles entire, and view them di¬ stinctly *, arid thus he found that they were not globular, as had been imagined by other anatomists, but flat. Ha¬ ving shaken a piece of the crassamentum of the blood in serum till the latter became a little coloured, he spread it with a soft hair pencil on a piece of thin glass, which he placed under the microscope, in such a man¬ ner as not to be quite horizontal, but rather higher at one end than the other. Thus the serum flows from the higher to the lower part; and, as it flows, some of the particles will he found to swim on their flat sides, and will appear to have a dark spot in the middle , while others will turn over from one side to the other as they roll down the glass. Many cruel experiments have been tried in order to observe the circulation of the blood in living creatures, and an apparatus had been invented for viewing the circula¬ tion in the mesentery of a frog ; but as this can an¬ swer no useful purpose, and will never be put in practice by persons of humanity, we ferbear to men¬ tion it. II. Besides the objects for the microscope already mentioned, there are innumerable others, some hardly visible, and others totally invisible, to the naked eye j and which therefore, in a more peculiar sense, are de¬ nominated. Microscopic Animals. They are the animalcules or moving bodies in water, in which certain substances have been infused ; and of which there are a great many different kinds. These animalcula are sometimes found in water which we would call pare, did not the microscope discover its minute inhabitants ; but not equally in all kinds of water, or even in all parts of the same kind of it. The surfaces of infusions are general¬ ly covered with a scum which is easily broken, but ac¬ quires thickness by standing. In this scum the great¬ est number of animalcules are usually found. Some¬ times it is necessary to dilute the infusions j but this ought always to be done with water, not only distill¬ ed, but viewed through a microscope, lest it should also have animalcules in it, and thus prove a source of deception. It is, however, most proper to observe those minute objects after the water is a little evapo¬ rated ; the attention being less diverted by a few ob¬ jects than when they appear in great number. One or two of the animalcules may be separated from the rest by placing a small drop of water on the glass near that of the infusion •, join them together by making a small connexion between them with a pin j and as 3 24 ] » MIC soon as you perceive that an animalcule has entered the clear drop, cut off the connexion again. ( Eels in paste are obtained by boiling a little flour and water into the consistence of bookbinders paste \ then exposing it to the air in an open vessel, and beat¬ ing it frequently together to keep the surface from growing mouldy or hard. In a few days it will be found peopled with myriads of little animals visible to the naked eye, which are the eels in question. They may be preserved for a whole year by keeping the paste moistened with water 5 and while this is done, the motion of the animals will keep the surface from growing mouldy. Mr Baker directs a drop or two of vinegar to be put into the paste now and then. When they are applied to the microscope, the paste must be diluted in a piece of water for them to swim Micro¬ scope. JL1J* Numberless animalcules are observed by the micro¬ scope in infusions of pepper. To make an infusion for this purpose, bruise as much common black pepper as will cover the bottom of an open jar, and lay it there¬ on about half an inch thick: pour as much soft water into the vessel as will rise about an inch above the pepper. Shake the whole well together : after which they must not be stirred, but be left exposed to the air for a few days ; in which time a thin pellicle will be formed on the surface, in which innumerable ani¬ mals are to be observed by the microscope. The microscopic animals are so different from those of the larger kinds, that scarce any sort of analogy seems to exist between them 5 and one would almost be tempted to think that they lived in consequence of laws directly opposite to those which preserve ourselves and other visible animals in existence. ^hey have been systematically arranged by O. F. Muller 5 though it is by no means probable that all the different classes have yet been discovered. Such as have been observ¬ ed, however, are by this author divided in the following manner: I. Such as have no external organs. 1. Monas : Punctiforme. A mere point. 2. Proteus : Mutabilis. Mutable. 3. Volvox : Sphsericum. Spherical. 4. Enchelis : Cylindracea. Cylindrical. 5. Vibrio ; Elongatum. Long. * Membranaceous. 6. Cyclidium : Ovale. Oval. 7. Paramecium : Oblongum. Oblong. 8. Kolpoda : Sinuatum. Sinuous. 9. Gonium : Angulatum. With angles. 10. Bursaria. Hollow like a purse. II. Those that have external organs, * Naked, or not enclosed in a shell. 1. Cercaria : Caudatum. With a tail. 2. Trichoda : Crinitum. Hairy. 3. Kerona : Corniculatum. With horns. 4. Himantopus ; Cirratum. Cirrated. 5. Leucophra : Ciliatum undique. Every part cili¬ ated. 6. Vorticella : Ciliatum apice. The apex ciliated. * Covered with a shell. 7. Brachionus : Ciliatum apice. The apex ciliated. In MIC [ 25 ] MIC Micro- In the treatise on Helminthology under the fifth scope, order of the class vermes, viz. Infusoria, the genera *—n " 1 here enumerated have already been noticed according to an arrangement somewhat different, and a few of the species have been described. For the sake of those who wish to prosecute microscopical inquiries, we shall introduce descriptions of a few more, and particularly those whose habitats are known. I. Monas. This is by our author defined to be “ an invisible (to the naked eye), pellucid, simple, punctiform worm but of which, small as it is, there are several species. The monas tcrma or gelatinosa, is a small jelly- like point, which can be but imperfectly seen by the single microscope, and not at all by the compound one. In a full light they totally disappear, by reason of their transparency. Some infusions are so full of them that scarce the least empty space can be perceived j the water itself appearing composed of innumerable globular points, in which a motion may be perceived somewhat similar to that which is observed when the sun’s rays shine on the water •, the whole multitude of animals appearing in commotion like a hive of bees. This animal is very common in ditch-water, and in almost all infusions either of animal or vegetable sub¬ stances. Monas atomus or albida; white monas with a variable point. This appears like a white point, which through a high magnifier appears somewhat egg-shaped. The smaller end is generally marked with a black point, the situation of which is variable ; sometimes it ap¬ pears on the large end, and sometimes there are two black spots in the middle. This species was found in sea water, which had been kept through the whole winter, but was not very fetid. No other kind of ani¬ malcule was found in it. II. The Troteus. An invisible, very simple, pellucid worm, of a variable form. The tenax, running out into a fine point. This is a pellucid gelatinous body, stored with black molecules, and likewise changing its figure, but in a more regular order than the former. It first extends itself in a straight line, the lower part terminating in a bright acute point. It appears to have no intestines \ and when the globules are all collected in the upper part, it next draws the pointed end up toward the middle of the body, which assumes a round form. It goes through a number of different shapes, part of which are described under the article Animalcule. It is found in some kinds of river water, and appears con¬ fined almost entirely to one place, only bending side- wise. III. Volvox. An invisible, very simple, pellucid, spherical worm. The punctum; of a black colour, with a lucid point. 'Jins is a small globule, with one hemisphere opaque and black, the other having a crystalline appearance j 'Mid a vehement motion is observed in the black part. Vol. XIV. Part I. ’ f It moves as on an axis, frequently passing through tire Micro drop in this manner. Many are often seen joined to- scope gether in their passage through the water 5 sometimes v moving as in a little whirlpool, and then separating. They are found in grest numbers on the surface of fetid sea water. The globulus, with the hinder part somewhat ob¬ scure, sometimes verges a little towards the oval in its shape, having a slow fluttering kind of motion, but more quick when disturbed. The intestines are but just visible. It is found in most vegetable infusions, and is ten times large than the monas lens. The lunula, with lunular molecules, is a small roundish transparent body, consisting of an innumerable multitude of homogeneous molecules of the shape of a crescent, without any common margin. It moves con¬ tinually in a twofold manner, viz. of the molecules among one another, and the whole mass turning slowly round. It is found in marshy places in the beginning of spiing. IV. Enchelis. A simple, invisible, cylindric worm. The viiidis, or green enchelis, has an obtuse tail, the fore part terminating in an acute truncated angle; the intestines are obscure and indistinct. It continually varies its motion, turning from right to left. The punctifera, having the fore part obtuse, the hinder part pointed. It is opaque, and of a green co¬ lour, with a small pellucid spot in the fore part, in which two black points may be seen ; and a kind of double band crosses the middle of the body. The hinder part is pellucid and pointed, with an incision supposed to be the mouth, at the apex of the fore part. It is found in marshes. The pupula, with the fore part papillary, is found in dunghill water in November and December : it has a rotatory motion on a longitudinal axis, and moves in an oblique direction through the water. Both ends are obtuse} and the hinder part is marked with a trans¬ parent circle, or circular aperture. V. Vibrio. A very simple, invisible, round, and rather long worm. The lineola is found in most vegetable infusions in such numbers, that it seems to fill up almost the whole of their substance. It is so small, that with the best magnifiers we can discern little more than an obscure tremulous motion among them. It is more slender than the monas terma. The serpens, with obtuse windings or flexures, is found in river water, but ■seldom. It is slender and ge¬ latinous, resembling a serpentine line, with an intestine down the middle. The spirillum is exceedingly minute, and twisted in a spiral form, which seems to be its natural shape, as it never untwists itself, but moves forward in a straight line, vibrating the hind and fore parts. It was found in 1782 in an infusion of the sonchus arvensis. The vcrmiculus has a milky appearance, with an ob¬ tuse apex, and a languid undulatory motion, like that of the common worm. It is found in marshy water in D November, MIC [ 26 ] MIC Micro- November, but seldom. It is thought to be the animal scoi)e- i mentioned by Leeuwenhoeck as found in the dung ol J,”_ v the frog and spawn of the male libellula. The sagitta, with a setaceous tail, has a long and flexible body ; broadest about the middle, and filled there also with gray molecules $ the fore part being drawn out into a thin and transparent neck, and the upper end thick and black. It is found in salt water, and seems to move by contracting and extending its neck. VI. Cyclidium. A simple, invisible, flat, pellucid, orbicular or oval worm. The bulla, or orbicular bright cyclidium. This is found occasionally in an infusion of hay. It is very pellucid and white, but the edges somewhat darker than the rest. It moves slowly, and in a semicircular direction. The millium is very pellucid, and splendid like cry¬ stal $ and of an elliptical figure, with a line through the whole length of it. The motion is swift, interrupt¬ ed, and fluttering. VII. Yaramcecium. An invisible, membranaceous, flat, and pellucid worm. The chrxjsalis is found in salt water, and differs very little from the former, only the ends are more obtuse, and the margins are filled with black globules. The versutum is found in ditches, and has an oblong, green, and gelatinous body, filled with molecules *, the lower part thicker than the other; and both ends ob¬ tuse. It propagates by division. VIII. Kolpoda. An invisible, pellucid, flat, and crooked worm. The lamella is very seldom met with. It resembles a long, narrow, and pellucid membrane, with the hind part obtuse, narrower, and curved towards the top. It has a vacillatory and very singular motion j going upon the sharp edge, not on the flat side as is usual with mi¬ croscopic animals. The gallinula is found in fetid salt water j and has the apex somewhat bent, the belly oval, convex, and striated. The rostrum is found, though seldom, in water where the lemna grows } and has a slow and horizontal motion. The fore part is bent into a kind of hook j the hind part obtuse, and quite filled with black mole¬ cules. The triquetra was found in salt water, and appears to consist of two membranes } the upper side flattened, the lower convex, with the apex bent into a kind of shoulder. The assimilis is found on the sea-coast, and has an elliptic mass in the middle, but is not folded like the ^former. The margin of the fore part is notched from the top to the middle j the lower part swells out, and contracts again into a small point. The cucullulus is found in an infusion of the sonchus arvensis. It is very pellucid and crystalline, with se¬ veral globules, and has an oblique incision a little below Micro- the apex. scope. The ren, or crassa, is found in an infusion of hay, ' v commonly about 13 hours after the infusion is made, and has a quick and vacillatory motion. Its body is yel¬ low, thick, and somewhat opaque j curved a little in the middle, so that it resembles a kidney; and lull of molecules. When the Water in which it swims is about to fail, it takes an oval form, is compressed, and at last bursts. IX. Gojiium. An invisible, simple, smooth, and angular worm. The pulvinatum is found in dunghills j and appears like a little quadrangular membrane, plain on both sides } but with a large magnifier it appears like a bol¬ ster formed of three or four cylindric pillows sunk here and there. The enrrugatum is found in various kinds of infu¬ sions *, and is somewhat of a square shape, very small, and in some positions appears as streaked. The truncatum is found chiefly in pure wi^er, and then but seldom. It has a languid motion, and is much larger than the foregoing. The fore part is a straight line, with which the sides form obtuse angles, the end of the sides being united by a curved line. The inter¬ nal molecules are of a dark green, and there are two little bright vesicles in the middle. X. Bursaria. A very simple, hollow, membranaceous worm. The truncate/la is visible to the naked eye 5 white, oval, and truncated at the top, where there is a large aperture descending towards the base. Most of them have four or five yellow eggs, at the bottom. They move from left to right, and from right to left; ascend¬ ing to the surface in a straight line, and sometimes roll¬ ing about while they descend. The bullina is pellucid and crystalline, having splen¬ did globules of different sizes swimming about with it. The under side is convex, the upper hollow, with the fore part forming a kind of lip. The hirundinella has two small projecting wings, which give it somewhat of the appearance of a bird : and it moves something like a swallow. It is invisible to the naked eye j but by the microscope appears a pellucid hollow membrane. The duplella was found among duckweed, and ap¬ pears like a crystalline membrane folded up, without any visible intestines except a small congeries of points under one of the folds. XI. Cercaria. An invisible transparent worm with a tail. The gyrinus greatly resembles the spermatic animal¬ cules. It has a white gelatinous body j the fore part somewhat globular 5 the hind part round, Jong, and pointed. Sometimes it appears a little compressed on each side. When swimming it keeps its tail in conti- . nual vibration like a tadpole. The gibba is found in the infusions of hay and other vegetables ^ MIC r 27 ] MIC vegetables j and is small, opaque, gelatinous, white, scope, and without any visible intestines. “ v 1 The incjuieta is found in salt water, and is remarkable for changing the shape of its body: sometimes it ap¬ pears spherical, sometimes like a long cylinder, and sometimes oval. It is white and gelatinous, the tail fi¬ liform and flexible, the upper part vibrating violently. A pellucid globule may be observed at the base, and two very small black points near the top. The tui'bo, with a tail like a bristle, is found among duckweed. It is of a talcy appearance, partly oval and ^partly spherical •, and seems to be composed of two glo¬ bular bodies, the lowermost of which is the smallest, and it has two little black points like eyes on the upper part. The tail is sometimes straight, sometimes turned kack on the body. The poduria is found in November and December, in marshy places covered with lemna. It is pellucid 5 ■and seems to consist of a head, trunk, and tail : the head resembles that of a herring ; the trunk is ventri- cose and full of intestines, of a spiral form and black eolour. The tail most commonly appears to be divided into two bristles. The intestines are in a continual motion when the body moves, and by reason of their various shades make it appear very rough. There are likewise some hairs to be perceived. It turns round as upon an axis when it moves. The viridis is found in the spring in ditches of stand¬ ing water ; and in some of its states has a considerable resemblance to the last, but has a much greater power of changing its shape. It is naturally cylindrical, the lower end sharp, and divided into two parts \ but some¬ times contracts the head ami tail so as to assume a sphe¬ rical figure. The setffera is found in salt w’ater, but seldom. It is small, the body rather opaque, and of a round fi¬ gure. The upper part is bright, and smaller than the rest: the trunk is more opaque ; the tail sharp, and near it a little row of short hairs. It has a slow rotato¬ ry motion. The hirta was likewise found in salt W'ater. It is opaque and cylindrical ; and when in motion, the body appears to be surrounded with rows of small hairs sepa¬ rated from each other. The pleuronectes is found in water which has been kept for several months. It is membranaceous, round¬ ish, and white, with two blackish points in the fore part, the hinder part being furnished with a slender sharp tail. It has orbicular intestines of different sizes in the middle ; the larger of them bright. The mo¬ tion is vacillatory $ and in swimming it keeps one edge of the lateral membrane upwards, the other folded down.. The tripos is flat, pellucid, triangular, having each angle of the base or fore part bent down into two linear arms, the apex of the triangle prolonged into a tail. It is found in salt water. XII. Leucophra. An invisible, pellucid, and ciliated worm. The Mantilla is of a dark colour, and filled with glo¬ bular molecules $ short hairs are curved inwards ; u,nd it occasionally projects and draws in a little white pro¬ tuberance. It is pretty common in marshy water. The vircscens is a large, pear-shaped, greenish-co- Micru- 1 cured animalcule, filled with opaque molecules, and co- s.cop See the article Polype. The digitalis. J XVII. Brackionus. A contractile worm, covered with a shell, and furnished with rotatory cilia. The patella is found in marshy water in the winter¬ time. It is univalve, the shell oval, plain, crystal¬ line, with the anterior part terminating in two acute points on both sides, though the intervening space is commonly filled up with the head of the animal. By these points it fastens itself, and whirls about the body erect. The rotatory cilia are perceived with great dif¬ ficulty. c already said on this subject, under Micro- shall here add the follow- scope, ing observations from Mr Adams.—“ How many kinds' ^ of these invisibles there may be (says he), is yet un¬ known } as they are discerned of all sizes, from those which are barely invisible to the naiced eye, to such as resist the force of the microscope as the fixed stars do that of the telescope, and with the greatest powers hi¬ therto invented appear only as so many moving points. The smallest living creatures our instruments can show, are those which inhabit the waters j for though animal- cula equally minute may fly in the air, or creep upon the earth, it is scarcely possible to get a view of them j but as water is transparent, by confining the creatures within it we can easily observe them by applying a drop- of it to the glasses. “ Animalcules in general are observed to move in all directions with equal ease and rapidity, sometimes obliquely, sometimes straight forward ; sometimes mov¬ ing in a circular direction, or rolling upon one another, running backwards and forwards through the whole ex¬ tent of the drop, as if diverting themselves 5 at other times greedily attacking the little parcels of matter they meet with. Notwithstanding their extreme minuteness, they know how to avoid obstacles, or to prevent any in¬ terference with one another in their motions : sometimes they will suddenly change the direction in which they move, and take an opposite one j and, by inclining the glass on which the drop of water is, as it can be made to move in any direction, so the animalcules appear to move as easily against the stream as with it. When the water begins to evaporate, they flock towards the place where the fluid is, and show a great anxiety and un¬ common agitation of the organs with which they draw in the water. These motions grow languid as the wa¬ ter fails, and at last cease altogether, without a possibi¬ lity of renewal if they be left dry for a short time. They sustain a great degree of cold as well as insects, and will perish in much the same degree of heat that destroys insects. Some animalcules are produced in wa¬ ter at the freezing point, and some insects live in snow. By mixing the least drop of urine with the water' in which they swim, they instantly fall into convulsions and die. u “ The same rule seems to hold good in those minute creatures, which is observable in the larger animals, viz.'that the larger kinds are less numerous than such as are smaller, while the smallest of all are found in such multitudes, that there seem to be myriads for one of the others. They increase in size, like other animals, from their birth until they have attained their full growth 5 and when deprived ol proper nourishment, they in like manner grow thin and perish.” The modes of propagation among these animalcules are various, and the observation of them is extremely curious. Some multiply by a transverse division, as is observed under the article Animalcule . and it is re¬ markable, that though in general they avoid one an¬ other, it is not uncommon, when one is nearly divided, to see another push itself upon the small neck which joins the two bodies in order to accelerate the separa¬ tion.—Others, when about to multiply, fix themselves to the bottom of the water j then becoming first ob¬ long, and afterwards round, turn rapidly as on a centre, but perpetually varying the direction of their rotatory motion.- [ 29 1 M I To what has been ortlrlp AmTIUAT.CULE. WC M I C ^Uoro- t:notion. In a little time, two lines to lining a cross are scope, perceived ; after which the spherule divides into four, ■* v" ' which grow, and are again divided as before. A third kind multiply by a longitudinal division, which in some begins in the fore part, in others in the hind part} and from others a small fragment detaches itself, which in a short time assumes the shape of the parent animalcule. Lastly, others propagate in the same manner as the more perfect animals. In our observations under the ai’ticle Animalcule, we suggested some doubts whether all those minute bo¬ dies which go under the name of animalcules really do enjoy animal life j or whether they are not in many cases to be accounted only inanimate and exceedingly minute points of matter actuated by the internal motion of the fluid. This has also been the opinion of others : hut to all hypotheses of this kind Mr Adams makes the following reply : “ From what has he^n said, it clearly appears, that their motions are not purely me¬ chanical, hut are produced by an internal spontaneous principle ; and that they must therefore be placed among the class of living animals, for they possess the strongest marks and the most decided characters of ani¬ mation ; and, consequently, that there is no foundation for the supposition of a chaotic and neutral kingdom, which can only have derived its origin from a very transient and superficial view of these animalcules.—It i may also be further observed, that as we see that the motions of the limbs, &c. of the larger animals, are produced by the' mechanical construction of the body, and the action of the soul thereon, and are forced by the ocular demonstration which arises from anatomical dissection to acknowledge this mechanism which is adapted to produce the various motions necessary to the animal j and as, when we have recourse to the micro¬ scope, we find those pieces which had appeared to the naked eye as the primary mechanical causes of particu¬ lar motions, to consist themselves of lesser parts, which are the causes of motion, extension, &c. in the larger 5 when the structure therefore can be traced no farther by the eye, or by the glasses, we have no right to con¬ clude that the parts which are invisible are not equally the subject of mechanism : for this would be only to as¬ sert in other words, that a thing may exist because we see and feel it, and have no existence when it is not the object of our senses.—The same train of reasoning may be applied to microscopic insects and animalcula : we see them move 5 but because the muscles and members which occasion these motions are invisible, shall we in¬ fer that they have not muscles, with organs appropri¬ ated to the motion of the whole and its parts ? To say that they exist not because we cannot perceive them, would not be a rational conclusion. Our senses are indeed given us that we may comprehend some effects ; but then we have also a mind, with reason, bestowed upon us, that, from the things which we do perceive with our senses, we may deduce the nature of those causes and effects which are imperceptible to the cor¬ poreal eye.” Leaving these speculations, however, we shall now proceed to give a particular Explanation of the figures of the various animals, Plate ^ieir Partsi ovai represented in the plates. CCCXLII. Fig* 32. 33. represent the eggs of the phalsena 3i* 33- neustria, as they are taken from the tree to which M I C they adh, rt, and magnified b_y the microscope. The ]yijcfd, strong ground-work visible in many places shows scope, the gum by which they are fastei ed together j —v--— and this connexion is strengthened by a very te¬ nacious substance interposed between the eggs, and filling up the vacant spaces. Fig. 34. shows a vertical Fig. 34. section of the eggs, exhibiting their oval shape.— Fig. 35. is an horizontal section through the middle Fig. 35. of the egg. These eggs make a beautiful appearance through the microscope. The small figures o, b, c, re¬ present the objects in their natural state, without being magnified. Fig. 36. shows the larva of the musca chameleon, an Fig 36, aquatic insect. When viewed by the naked eye, it ap¬ pears (as here represented) to be composed of twelve annular divisions, separating it into an head, thorax, and abdomen ; but it is not easy to distinguish the two last parts from each other, as the intestines lie equally both in the thorax and abdomen. The tail is furnished with a fine crown or circle of hair b, disposed in the form of a ring, and by this means it is supported on the surface of the water, the head and body hanging down dowards the bottom, in which posture it will sometimes remain for a considerable time without any motion.—When it has a mind to sink to the bottom, it closes the hairs of the ring, as in fag. 37. Thus an hoi-pig. 37, low space is formed, including a small bubble of air j by enlarging or diminishing which, it can rise or sink in the water at pleasure. When the bubble escapes, the insect can replace it from the pulmonary tubes, and sometimes considerable ^quantities of-air maybe seen to escape from the tail of the-worm into the common atmosphere ; which operation may easily be observed when the worm is placed in a glass of water, and af¬ fords an interesting spectacle. The snout of this in¬ sect is divided into three parts, of which that in the middle is immoveable 5 the other two, which grow from the sides of the middle one, are moveable, and vibrate like the tongues of lizards or serpents. In these lateral parts lies most of the creature’s strength j for it walks upon them when out of the water, appearing to 'walk on its mouth, and to use it as the parrot does its beak to assist it in climbing. The larva is shown, fig. 38. as it appears through a pjo microscope. It grows narrower towards the head, is 0 largest about that part which we may call the thorax, converges all along the abdomen, and terminates at length in a sharp tail surrounded with hairs, as has al¬ ready been mentioned. The twelve annular divisions are now extremely visible, and are marked by numbers in the plate. The skin appears somewhat hard, and resembling shagreen, being thick set with grains pret¬ ty equally distributed. It has nine holes, or spiracula, probably for the purpose of breathing, on each side j but it has none of these on the tail division a, nor any easily visible on the third from the head. In the lat¬ ter, indeed, it has some very small holes concealed un¬ der the skin, near the place where the embryo wings of the future fly are hid. “ It is remarkable says Mr Adams) that caterpillars, in general, have two rings without these spiracula, perhaps because they change into flies with lour wings, whereas this worm produces a fly with only two.” The skin of the larva is adorn¬ ed with oblong black furrows, spots of alight colour, and orbicular rings, from which there generally springs L 30 1 MIG t 3 Micro- a hair j hut only those hairs which grow on the insect’s scope, sides are represented in the figure. There are also some ■"—v larger hairs here and there, as at c c. The difference of colour, however, in this worm arises only from the quantity of grains in the same space 5 for where they are in very great numbers, the furrows are darker, and paler where they are less plentiful. The head d is divided into three parts, and covered with a skin which has hardly any discernible grains.— The eyes are rather protuberant, and lie near the snout; on which last are two small horns at i i. It is crooked, and ends in a sharp point as at f The legs are placed near the snout between the sinuses in which the eyes are fixed. Each of these legs consists of three joints, the outermost of which is covered with stiff hairs like bristles g g. From the next joint there spi'ings a horny bone h h, used by the insect as a kind of thumb 5 the joint is also composed of a black substance of an inter¬ mediate hardness between bone and horn 5 and the third joint is of the same nature. In order to distinguish these parts, those that form the upper sides of the mouth and eyes must be separated by means of a small knife; after which, by the assistance of the microscope, we may perceive that the leg is articulated by some parti¬ cular ligaments, with the portion of the insect’s mouth which answers to the lower jaw in the human frame. We may then also discern the muscles which serve to move the legs, and draw them up into a cavity that lies between the snout and those parts of the mouth which are near the horns i t. The insect walks upon these legs, not only in the water, but on the land also. It likewise makes use of them in swimming, keeping its tail on the surface contiguous to the air, and hanging downward with the rest of die body in the water. In this situation, the only perceptible motion it has is in its legs, which it moves in a most elegant manner, from whence it is reasonable to conclude, that the most of this creature’s strength lies in its legs, as we have al¬ ready observed. The snout of this larva is black and hard : the back part quite solid, and somewhat of a globular form •, the front f sharp and hollow. Three membranaceous di¬ visions may be perceived on the back part; by means of which, and the muscles contained in the snout, the creature can contract or expand it at pleasure. The extremity of the tail is surrounded with thirty" hairs, and the sides adorned with others that are small¬ er ; and here and there the large hairs branch out into smaller ones, which may be reckoned single hairs. All these have their roots in the outer skin, which in this place is covered with rough grains, as mav be observ¬ ed by cutting it oft' and holding it against the light’ upon a slip of glass. Thus also we find, that at the ex¬ tremities of the hairs there are grains like those on the skin •, and in the middle of the tail there is a small open¬ ing, within which are minute holes, by which the insect takes in and lets out the air it breathes. These hairs, however, are seldom disposed in such a regular order as is represented in fig. 38. unless when the insect floats with the body in the water, and the tail with its hairs a little lower than the surface, in which case they are dis¬ posed exactly in the order delineated in the plate. The least motion of the tail downwards produces a concavity in the vrater j and it then assumes the figure of a wine glass, wide at the top and narrow at the bottom. The i j MIC tail answers the double purpose of swimming and breath- Micro ing, and through it the insect receives what is the prin- scope, ciple of life and motion to all animals. By means of v“"-v—— these hairs also it can stop its motion when swimming, and remain suspended quietly without motion for any length of time. Its motions in swimming are very beautiful, especially when it advances with its whole body floating on the surface of the water, after filling itself with air by the tail.—To set out, it first bends the body to the right or left, and then contracts it in the form of the letter S, and again stretches it out in a straight line : by thus contracting and then ex¬ tending the body alternately, it moves on the surface of the water. It is very quiet, and is not disturbed by handling. These creatures are commonly found in shallow standing waters in the beginning of June : but some years much more plentifully than others. They crawl on the grass and other plants which grow in such wa¬ ters, and are often met with in ditches, floating on the surface of the water by means of their tail, the head and thorax at the same time hanging down 5 and in this posture they turn over the clay and dirt with their snout and feet in search of food, which is commonly a viscous matter met with in small ponds and ditches. It is very harmless, though its appearance would seem to indicate the contrary. It is most easily killed for dissection by spirit of turpentine. Fig. 39. shows in its natural size a beautiful insect, yjg, ^ described by Linnaeus under the name of Leircopsis dor- sigera, and which appears to be a kind of intermedi¬ ate genus between a sphex and a wasp. The antennae are black and cylindrical, increasing in thickness to¬ wards the extremity 5 the joint nearest the head is yellow ; the head and thorax are black, encompassed with a yellow line, and furnished with a cross line of the same colour near the head. The scutellum is yellow, the abdomen black, with two yellow bands, and a deep spot of the same colour on each side between the bands. A deep polished groove extends down the back from the thorax to the anus, into which the' sting turns and is deposited, leaving the anus very cir¬ cular j a yellow line runs on each side of the sting.— The anus and whole body, when viewed with a small magnifier, appear punctuated; but when these points are seen through a large magnifier, they appear hexa¬ gonal. Fig. 40. shows the insect very much magni- j^ ^ fied. Fig. 41. gives a side view of it magnified in a 0 ^ smaller degree. ^ Fig. 42. shows an insect discovered by Mr John Plate Adams of Edmonton, as he happened to be at an CCCXLHX. inn. It was first seen by some labouring people 4-- who were there at the time, by whom it was conjec¬ tured to be a louse with unusually long horns, a mite, &c. Mr Adams hearing the debate, procured the insect; and having viewed it through a microscope, it presented' the appearance exhibited in fig. 42. The insect seems to be quite distinct from the phalangium caocroides of Linnceus. The latter has been described by several authors, but none of their descriptions agree with this. The abdomen of this insect is more ex¬ tended, the claws larger, and much more obtuse ; the body of the other being nearly orbicular, the claws slender, and almost terminating in a point, more trans- parentj ajid of a paler colour. Mr Marsham has one* Micro¬ scope. I'ig- 43- Fig. 44. 45- -Fig. 46. MIC [3 ih his possession not to be distinguished from that re¬ presented in fig. 42. excepting only that it wants the break or dent in the claws, which is so conspicuous in this. He found that insect firmly fixed by its claws to the thigh of a large fly, which he caught on a flower in Essex in the first week of August, and from which he could not disengage it without great difficul¬ ty, and tearing olf the leg of the fly. This was done upon a piece of writing paper j and he was surprised to see the little creature spring forward a quarter of an inch, and again seize the thigh with its claws, so that he. had great difficulty in disengaging it. The na¬ tural size of this creature, which Mr Adams calls the lobstct'-insect, is exhibited at a. Fig. 43. shows the insect named by M. de Geer Physapus, on account of the bladders at its feet, (Thrips physapus, Lin.). This insect is to be found in great plenty upon the flowers of dandelion, &c. in the spring and summer. It has four wings, two up¬ per and two under ones (represented fig. 44.) 5 but the two undermost are not to be perceived without great difficulty. They are very long; and fixed to the upper part of the breast, lying horizontally. Both of them are rather pointed towards the edges, and have a strong nerve running round them, which is set with a hair fringe tufted at the extremity. The colour of these wings is whitish : the body of the insect is black ; the head small, with two large reticular eyes. The an¬ tennae are of an equal size throughout, and divided in¬ to six oval pieces, which are articulated together.— The extremities of the feet are furnished with a mem¬ branaceous and flexible bladder, which it can throw out or draw in At pleasure. It presses this bladder against the substances on which it walks, and thus seems to fix itself to them ; the bladder sometimes ap¬ pears concave towards the bottom, the concavity dimi¬ nishing as it is less pressed. The insect is represented of its natural size at b. Fig. 45. represents the cimex striatus of Linnaeus, remarkable for very bright and elegantly disposed colours, though few in number. The head, pro¬ boscis, and thorax, are black : the thorax orna¬ mented with yellow spots ; the middle one large, and occupying almost one-third of the posterior part; the other two are oft each side, and triangular. The scutellum has two yellow oblong spots, pointed at each end. The ground of the elytra is a bright yellow; spotted and striped with black. The nerves are yellow; and there is a brilliant triangular spot of orange, which unites the crustaceous and membrana¬ ceous parts ; the latter are brown, and clouded. It is found in the elm tree in June. It is represented of its natural size at c. Fig. 46. shows the chrysomela asparagi of Linnteus, so called from the larva of the insect feeding upon that plant. It is a common insect, and very beautiful. It is of 'an oblong figure, with black antennae, composed of many joints, nearly oval. The head is a deep and bright blue ; the thorax red and cylindrical: the elytra are blue, with a yellow margin, and having three spots of the same colour on each; one at the base, of an oblong form, and two united with the margin : the legs are black ; but the under side of the belly is of the same blue colour with the elytra and head. This little animal, when viewed by the naked eye, scarcely 3 ! ] MIC appears to deserve any notice ; but when examined by Micro- the microscope, is one of the most pleasing opaque ob-1 scope. f jects we have. It is found in June on the asparagus T~v_ after it has run to seed ; and it is shown of its natural size at r/. He Geer says that it is very scarce in Swe¬ den. Fig. 47. shows an insect of a shape so remarkable, Fjg 47. that naturalists have been at a loss to determine the genus to which it belongs. In the I auna Suecica, Linnaeus makes it an attelabus: but in the last edition of the Systema Naturae, it is ranged as a meloe, un¬ der the title of the Meloe monoccros ; though of this also there seems to be some doubt. The true figure of it can only be discovered by a very good microscope. The head is black, and appears to be hid or buried under the thorax, which projects forward like a horn : the antennae are composed of many joints, and are of a dirtv yellow colour, as well as the feet: the hinder part of the thorax is reddish, the fore part black.— The elytra are yellow, with a black longitudinal line down the suture ; there is a band of the same colour near the apex, and also a black point near the base, the whole animal being curiously covered with hair. The natural size of it is shown at e. It was found in May. Geoffroy says that it lives upon umbelliferous plants. Fig. 48.—54. exhibit the anatomy of the cossus ca- Plate terpillar, which lives on the willow. The egg from CCCXLIII, which it proceeds is attached to the trunk of the “S’48 '-54» tree by a kind of viscous juice, which soon becomes so hard that the rain cannot dissolve it. The egg it¬ self is very small and spheroidical, and, when examined by the microscope, appears to have broad weaving fur¬ rows running through the w hole length of it, which are again crossed by close streaks, giving it the appearance of a wicker basket. It is not exactly known what time they are hatched ; but as the small caterpillars appear in September, it is probable that the eggs are hatched some time ii» August. When small, they are generally met wuth under the bark ol the tree to which the eggs were affixed ; and an aqueous moisture, oozing from the hole through which they got under the bark, is frequently, though not always, a direction for find¬ ing them. These caterpillars change their colour but very little, being nearly the same when young as when old. Like many others, they are capable of spinning as soon as they come from the egg. They also change their skin several times; but as it is almost impossible to rear them under a glass, so it is very difficult to know exactly how often this moulting takes place.— Mr Adams conjectures that it is more frequently than the generality of caterpillars do, some having been observed to change more than nine times. The cossus generally fasts for some days previous to the moulting ; during which time the fleshy and other interior parts of the head are detached from the old skull, and retire as it were within the neck. Ihe new coverings soon grow on, but are at first very soft.— When the new skin and the other parts are formed, the old skin is to be opened, and all the members with¬ drawn from it; an operation naturally difficult, but which must be rendered more so from the soft and weak state of the creature at that time. It is always much larger after each change. From Mr Lyonet’s experiments, it appears, that the cossus MIC [ 33 ] MIC Micro- cossus generally passes at least two winters, if not scope three, before it assumes the pupa state. At the ap- v ~ proach of winter, it forms a little case, the inside of which is lined with silk, and the outside covered with wood ground like vei’y line saw-dust. During the whole season it neither moves nor eats. This caterpillar, at its first appearance, is not above one-twelfth of an inch long} but at last attains the length of two, and sometimes of three inches. In the month of May it prepares for the pupa state } the first care being to find a hole in the tree sufficient to allow the moth to issue forth j and if this cannot be found, it makes one equal in size to the future pupa. It then begins to form of 'wood a case or cone } uniting the bits, which are very thin, together by silk, into the form of an ellipsoid, the outside being formed of small bits of wood joined together in all directions } taking care, however, that the pointed end of the case may always be opposite to the mouth of the hole : having finished the outside of the case, it lines the inside with a silken tapestry of a close texture in all its parts, ex¬ cept the pointed end, where the texture is looser, in order to facilitate its escape at the proper time. The caterpillar then places itself in such a posture, that the head may always lie towards the opening of the hole in the tree or pointed end of its case. Thus it re¬ mains at rest for some time: the colour of the skin fii’st becomes pale, and afterwards brown} the interior parts of the head are detached from the skull } the legs withdraw themselves from the exterior case ; the body shortens } the posterior part grows small, while the anterior part swells so much, that the skin at last bursts j and, by a variety of motions, is pushed down to the tail } and thus the pupa is exhibited, in which the parts of the future moth may be easily traced.— The covering of the pupa, though at first soft, hu¬ mid, and white, soon dries and hardens, and becomes of a dark purple colour } the posterior part is move- able } but not the fore part, which contains the rudi¬ ments of the head, legs, and wings. The fore-part of the pupa is furnished with two horns, one above and the other under the eyes. It has also several rows of points on its back. It remains for some weeks in the case *, after which the moth begins to agitate itself, and the points are then of essential service, by acting as a fulcrum, upon which it may rest in its endeavours to proceed forward, and not slip back by its efforts for that purpose. The moth generally continues its endeavours to open the case for a quarter of an hour: after which, by re¬ doubled efforts, it enlarges the hole, and presses for¬ ward until it arrives at the edge, where it makes a full stop, lest by advancing further it should fall to the ground. After having in this manner reposed itself for some time, it begins to disengage itself entirely; and having rested for some hours with its head up¬ wards, it becomes fit for action. Mr Marsham says, that it generally pushes one-third of the case out of the hole before it halts. The body of the caterpillar is divided into twelve rings, marked i, 2, 3, &c. as represented in fig. 48, 49, 50, 51. each of which is distinguished from that which precedes, and that which follows, by a kind of neck or hollow} and, by forming boundaries to the rings, we make twelve other divisions, likewise expres- Vol. XIV. Part I. ' f sed in the figures ; but to the first of these the word Micro- ring is affixed, and to the second, division. To facili- scope tate the description of this animal, M. Lyouet supposed 1 a line to pass down through the middle of the back, which he called the superior line, because it marked the most elevated part of the back of the caterpillar} and another, passing from the head down the belly to the tail, he called the inferior line. All caterpillars have a small organ, resembling an elliptic spot, on the right and left of each ring, ex¬ cepting the second, third, and last *, and by these we are furnished with a further subdivision of this caterpil¬ lar, viz. by lines.passing through the spiracula, the one on the right side, the other on the left of the caterpil¬ lar. These four lines, which divide the caterpillar longitudinally into four equal parts, mark each the place under the skin which is occupied by a consider¬ able viscus. Under the superior line lies the heart, or rather thread of hearts *, over the inferior line, the spi¬ nal marrow •, and the two tracheal arteries follow the course of the lateral lines. At equal distances from the superior and two lateral lines, we may suppose four intermediate lines. The two between the supe¬ rior and lateral lines are called the intermediate supe¬ rior } the twm others opposite to them, and between the lateral and inferior lines, are called the interme¬ diate inferior. Fig. 48, 49. show the muscles of the caterpillar, ar- Fig. 48. ranged with the most wonderful symmetry and order, and 49* especially when taken off by equal strata on both sides, which exhibits an astonishing and exact form and cor¬ respondence in them. The figures show the muscles of two difterent caterpillars opened at the belly, and supposed to be joined together at the superior lines. The muscles of the back are marked by capitals ; the gastric muscles by Roman letters} the lateral ones by Greek characters. Those marked 6 are called, by M. Lyonet, dividing muscles, on account of their situa¬ tion. The caterpillar was prepared for dissection by being emptied, and the muscles, nerves, &c. freed from the fat in the manner formerly directed: after which the following observations were made. The muscle A in the first ring is double ; the ante¬ rior one being thick at top, and being apparently di¬ vided into different muscles on the upper side, but without any appearance of this kind on the under side. One insertion is at the skin of the neck towards the head } the other is a little above ; and that of the se¬ cond muscle A is a little below the first spiraculum, near which they are fixed to the skin. The muscle marked « is long and slender, fixed by its anterior extremity under the gastric muscles a and 6 of the first ring, to the circumflex scale of the base of the lower lip. It communicates with the muscle c of the second ring, after having passed under some of the arteries, and introduced itself belowr the muscle 0. , The muscle /3 is so tender, that it is scarcely possible to open the belly of the caterpillar without breaking it. It is sometimes double, and sometimes triple.— Anteriorly it is fixed to the posterior edge of the side of the parietal scale, the lower fixture being at the mid¬ dle of the ring near the inferior line. There are three muscles marked | *, the first affixed E ' at MIC L 34 ] MIC Micro- at one extremity near the lower edge of the upper scope. part 0f the parietal scale ; the other end divides itself ”' v ' into three or four tails, fixed to the skin of the cater¬ pillar under the muscle The anterior part of the second is fixed near the first } the anterior part of the third a little under the first and second, at the skin of the neck under the muscle A. These two last passing over the cavity of the fii’st pair of limbs, are fixed by several tails to the edge opposite to this cavity. In this subject there are two muscles marked but some¬ times there is only one anteriorly j they are fixed to the lower edge of the parietal scale, the other ends be¬ ing inserted in the first fold of the skin of the neck on the belly-side. Fig. 50. best represents the muscles /3 and 5 5 as in that figure they do not appear injured by any unnatural connection. In the second and four following rings, we dis¬ cern two large dorsal muscles A and B. In the 7th, 9th and 10th rings are three, A, B, and C j in the nth are four, A, B, C, and D ; and in the an¬ terior part of the 12th ring are five, A, B, C, D, and E. All these ranges of muscles, however, as well as the gastric muscles o, &, c, d, appear at first sight only as a single muscle, running nearly the whole length of the caterpillar; but when this is detached from the animal, it is found to consist of so many di¬ stinct muscles, each consisting only of the length of one of the rings, their extremities being fixed to the division of each ring, excepting the middle muscle u, which, at the 6th, 7th, 8th, and 9th rings, has its in¬ sertions rather beyond the division. Each row of muscles appears as one, because they are closely con¬ nected at top by some of the fibres which pass from one ring to the other. The muscles A, which are 12 in number, gradually diminish in breadth to the lower part of the last ring: at the 8th and three following divisions they communi¬ cate with the muscles B, and at the nth with D. In the lower part of the last ring, A is much broader than it was in the preceding ring; one extremity of it is contracted, and communicates with B •, the lower in¬ sertion being at the membrane I, which is the exterior skin of the fecal bag. The muscles A and B, on the lower part of the last ring, cannot be seen until a large muscle is removed, which on one side is fixed to the subdivision of the ring, and on the other to the fecal bag. The right muscles B, which are also 1 2 in number, begin at the second ring, and grow larger from thence to "the seventh. They are usually narrower from thence to the 1 2th *, the deficiency in width being supplied by the six muscles C, which accompany it from the 7th to the subdivision of the 12th ring. The muscles B and C communicate laterally with the 8th, nth, and 12th di¬ visions. C is wanting at the subdivision of the 1 2th its place being here supplied by B, which becomes broader at this part. The first of the three floating muscles V originates at the first ring, from whence it introduces itself under N, where it is fixed, and then subdivides, and hides it¬ self under other parts. The second begins at the second division, being fixed to the anterior extremity B of the second ring •, from thence directing itself towards the stomach 5 and, after communicating with the case of the corpus crassum, it divides, and spreads into eight muscles which run along the belly. The third begins Micro- at the third division, originating partly at the skin, and i scope. partly at the junction of the muscles B of the second and third ring. It directs itself obli([uely towards the belly, meeting it near the third spiraculum; and branch¬ ing from thence, it iorms the oblique muscles of some of the viscera. The thin long muscle 6, which is at the subdivision of the last ringj and covers the anterior insertion of the muscle («) where the ring terminates, is ‘■ingle. It be¬ gins at one extremity of the muscle (c) ; at the fore part of the ring runs along the subdivision round the belly of the caterpillar, and finishes, on the other side, at the extremity of a similar muscle C. ^ Fig. 49. shows the dorsal muscles of the cossus. lo view which in an advantageous manner, we must use the following mode of preparation. 1. All the dorsal muscles, 35 in number, must be taken out, as well as the seven lateral ones already de¬ scribed. 2. All the straight muscles of the belly must be taken array, as well as the muscular roots (c), and the ends of the gastric muscles (e), which are at the third and fourth divisions. 3. At the second division the muscle 6 must be re¬ moved ; only the extremities being left to show where it was inserted. The parts being thus prepared, we begin at the third ring 5 where there are found four dorsal muscles C, II, E, and F. The first one C, is inserted at the third di¬ vision, under the muscles & and oc, where it communi¬ cates by means of some fibres with the muscle /" of the second ring } proceeding from thence obliquely towards the intermediate superior line, and is fixed at the fourth division. As soon as C is retrenched, the muscle D is seen ; which grows wider from the anterior extremity: it lies in a contrary direction to the muscle C, and is inserted into the third and fourth divisions. The muscle E lies in the same direction as the middle C, but not so obliquely : the lower insertion is at the fourth division ; the other at the third, immediately under C. I he muscle F is nearly parallel to D which joins it ; the first insertion is visible, but the other is hid under the muscles E and G at the fourth division. In the eight following rings, there are only two dor¬ sal muscles 5 and of these D is the only one that is com¬ pletely seen. It is very large, and diminishes gradually in breadth from one ring to the other, till it comes to the last, sending oft’ branches in some places.—E is one of the strait muscles of the back ; and is inserted under the dividing muscles 6, at the divisions of its own ring. On the anterior part of the 12th ring there are three dorsal muscles, I), E, and F. I) is similar to that of the preceding ring, marked also I), only that it is no more than half the length •, terminating at the subdivi¬ sion of its orvn ring. E is of the same length, and differs from the muscle E of the preceding ring only in its direction. F is parallel to E, and shorter than it; its anterior end does not reach the twelfth divi¬ sion. On the posterior part there is only one dorsal muscle, fastened by some short ones to the subdivi¬ sion of the last ring, traversing the muscles « ; and be¬ ing fixed there as if designed to strengthen them, and to M 1 C [ 55 to vary tlieiv direction.—at Ls a single muscle, of which scops- the anterior insertion is visible, the other end being -*v ■1 ' fixed to the bottom of the foot of the last leg ; its use is to move the foot. The anterior part of the muscle /3 branches into three or four heads, which cross the superior line obliquely, and are fixed to the skin a little above it. The other end is fastened to the .membrane T. Jig. 50.51. Fig. 50. and 51. show the muscles of the caterpillar when it is opened at the back. The preparation for this view is to disengage the fat and other extraneous .matter, as before directed. The first ring has only two gastric -muscles (c) and (r/) : the former is broad, and has three or four little tails : the first fixture is at the base of the lower lip, from whence it descends obliquely, and is fixed be¬ tween the inferior and lateral line. The small muscle ((/) is fastened on one side to the first spiraculum *, on the other, a little lower, to the intermediate inferior and lateral line ■, and seems to be an antagonist to the muscle F, which opens the spiracula. The posterior fixture of ^ is under the muscle C, near the skin of the neck ; /3 is fixed a little on the other side of C, at the middle of the ring. In the second ring there are three gastric muscles, .g, h, and i: g and h are fixed at the folds which termi¬ nate the ring 5 but only the anterior part of i is fixed there. The muscle h is triple, and in one of the divi¬ sions separated into two parts 5 that marked i comes nearer the inferior line, and is fixed a little beyond the middle of the ring, where the corresponding muscle of the opposite side is forked to receive it. In the third ring, the muscle //, which was triple in the foregoing ring, is only double here, that part which is nearest the inferior line being broadest: it has three .tails, of which only two are visible in the figure. It is exactly similar to that of the pi’eceding ring ; and is crossed in the same manner by the muscle from the op- yposite side of the ring. Throughout the eight following rings, the muscle f which runs through them all is very broad and strong. The anterior part of it is fixed at the intermediate in- -ferior line, on the fold of the first division of the ring : ,-the other part is fixed beyond the lower division \ with this difference, that at the 10th and 1 ith rings it is^fix¬ ed at the last fold of its ring •, whereas, in the others it passes over that ring, and is inserted into the skin of the following one. In all these, the first extremity of the muscle g is fastened to the fold which separates the ring from the preceding one, and is parallel to f, and placed at the side of it. The first six muscles marked g, are forked ; that of the fourth ring being more so than -the rest, nor does it unite till near its anterior insertion. The longest tail lays hold of the following, and is inserted near the inferior line ; the other inserts itself near the same line, at about the middle of its own -ring 5 the two last do not branch out; but termi¬ nate at the divisions, without reaching the following ring. The muscle h, placed at the side of f lias nearly the same direction, and finishes at the folds of the ring. The anterior part of the 12th ring has only one gas¬ tric muscle, marked e: it is placed on the intermediate inferior line ; and is inserted at the folds of the upper division, and at the subdivision of this ring. The lower ] M I C part has a larger muscle marked c, with several divj- Micro- sioas 5 one placed under with one extremity fixed scope, near the lateral line, at the subdivision of its ring 5'“■—"v'"* the other to the fecal bag, a little lower than the muscle b. In fig. 51. all the gastric muscles described in fig. 50. disappear, as well as those lateral and dorsal ones of which the letters are not to be found in this figure. In the first ring are the gastric muscles, e, f g, which are best seen here : the first is narrow and long, passing under and crossing /'; one of its insertions is at the lower line, the other at the lateral, between the spi¬ raculum and neck : f\s> short, broad, and nearly sti’aight, placed along the intermediate line 5 but between it and the lateral it passes under e, and is fixed to the fold of the skin which goes from the one bag to the other j the lower insertion is near the second division. There are sometimes three muscles of those marked g, and some¬ times four : the lower parts of them are fixed alxout tlx* middle of the ring, and the anterior paxts at the fold of the skin near the neck. The muscles i and h are fixed to the same fold ; the other end of Ji being fixed under the muscle II, near the spiraculum. Above the upper end of /j a muscular hotly, g, may be seen. Ft is formed by the separation of two floating muscles. The second ring has six gastric muscles, /, m, n, 0, p. The first is a large oblique muscle, with three or four divisions placed at the antei'ior part of the ring : the head is fixed between the inferior line and its intei*- medixite one, at the fold of the second division; from whence it crosses the inferior line and its coricsponding muscle, terminating to the right and left of the line. I is a narrow muscle, whose head is fixed to the fold of the second division ; the tail of it lying under n, and fastened to the edge of the skin that forms the cavity for the leg. The two muscles marked m have the same obliquity, and are placed the one on the other ; the head is inserted in the skin under the muscle /3, and communicates by a number of filn-es with the tail of the muscle y; the other end is fixed to the intei’mediate inferior line at the fold of the third division. The large and broad muscle covers the lower edge of the cavi¬ ty of the limb, and the extremity of the tail of /. It is fixed first at the skin, near the intermediate line, from whence it goes in a perpendicular direction to¬ wards m, and introduces itself under 0 and m, where it is fixed. The muscle 0 is narrow and bent, and covex-s the edge of the cavity of the leg for a little way ; one end terminating there, and the other finishing at the third division near m. That marked p is also bent: it runs near the anterior edge of the cavity of the leg ; one end meets the head of 0, the other end terminates at a raised fold near the infei’ior line. There is a trian¬ gular muscle on the side of the lateral muscle 0, similar to that marked g in the following ring; in this figure it is entirely concealed by the muscle nu The third x-ing has no muscle similar to m ; that max-ked k differs only from that of the second i-ing in being crossed by the opposite muscle. Those mark¬ ed /, «, 0, p, are similar to those of the preceding one. The muscle q is triangular; the base is fastened to the last fold of the ring ; on the lower side it is fixed to the muscle 0, the top to the skin at the edge of the ca¬ vity for the leg. E 2 The MIC [ 36 I MIC Micro- The eight following rings have the gastric muscles, scope. A:, /, and w. The muscle i is quite straight, and i"1 y ' placed at some distance from the inferior line : it is broad at the fourth ring, but diminishes gradually in breadth to the nth. In the fourth it is united j but divides into two heads, which divaricate in the follow¬ ing rings. In the six next rings these heads are fixed nearly at the same place with a and f; and in the other two it terminates at the fold of the ring. The anterior insertion of the first and last is at the fold where the ring begins j that of the six others is somewhat lower under the place where the muscle i terminates. The lower part of the oblique muscle A: is inserted in the skin near i; the upper part at the intermediate inferior muscle upon the fold which separates the following ring, but is wanting in the nth. The muscle / is large, and co-ojjerates with M: in the opening and shutting the spiraculum, one of its fixtures iss near the intermediate inferior line, at about the same height as z. The tail terminates a little below' the spiracu¬ lum. The twelfth ring has only the single gastric muscle d, which is a bundle of six, seven, or eight muscles : the first fixture of these is at the subdivision of the ring near the inferior line : one or two cross this, and at the same time the similar muscles of the opposite side. Their fixture is at the bottom of the foot; and their office is to assist the muscle a in bringing back the foot, and to loosen the claw from what it lays hold of. One of the insertions of this muscle a is observed in this figure near c?, the other near the subdivision of the ring. Fig. S2} S3- J ig* antl 53- show the organization of the head of the cossus, though in a very imperfect manner, as M. Lyonet found it necessary to employ twenty figures to explain it fully. The head is represented as it ap¬ pears when separated from the fat, and disengaged from the neck. HH are the tw'o palpi. The truncated muscles D belong to the lower lip, and assist moving it. K shows the two ganglions of the neck united. II are the two vessels which assist in spinning the silk. L, the oesophagus. M, the two dissolving vessels. The He¬ brew characters JOiT show the continuation of the four cephalic arteries. In fig. 52. the ten abductor muscles of the jaw are represented by SS, TT, VV, and Z. Four occipital muscles are seen in fig. 53. under e e and f f At a k is represented a nerve of the first pair be¬ longing to the ganglion of the neck-, & is a branch of this nerve. j'jg_ 24. Tig. 54. exhibits the nerves as seen from the under part; but excepting in two or three nerves, which may be easily distinguished, only one of each pair is drawn, in order to avoid confusion. The nerves of the first ganglion of the neck are marked by capital letters, those of the ganglion (a) of the head by Roman let¬ ters •, the nerves of the small ganglion by Greek cha¬ racters. Those of the frontal ganglion, except one, by numbers. The muscles of the cossus have neither the colour nor form of those of larger animals. In their natu¬ ral state they are soft, and of the consistence of a jelly. Their colour is a grayish blue, which, with the silver- coloured appearance of the pulmonary vessels, form a glorious spectacle. After the caterpillar has been soaked for some time in spirit of wine, they lose then- elasticity and transparency, becoming firm, opaque, Micro and white, and the air-vessels totally disappear. The , Sf Qpe- number of muscles in a caterpillar is very great. The greatest part of the head is composed of them, and there is a vast number about the oesophagus, intes¬ tines, &c. the skin is, as it were, lined by different beds of them, placed the one under the other, and ranged with great symmetry. M. Lyonet has been able to distinguish 228 in the head, 1647 ^ie body, and 2066 in the intestinal tube, making in all 3941* At first sight the muscles might be taken for ten¬ dons, as being of the same colour, and having nearly the same lustre. They are generally flat, and of an equal size throughout 5 the middle seldom differing either in colour or size from either of the extremities. If they are separated, however, by means of very fine needles, in a drop of some fluid, we find them com¬ posed not only of fibres, membranes, and air-vessels, but likewise of nerves; and, from the drops of oil that may be seen floating on the fluid, they appear al¬ so to be furnished with many unctuous particles. Their ends are fixed to the skin, but the rest of the muscle is generally free and floating. Several of them branch out considerably; and the branches sometimes extend so far, that it is not easy to discover whether they are distinct and separate muscles or parts of another. They are moderately strong j and those which have been soaked in spirit of wine, when examined by the microscope, are found to be covered with a membrane which may be separated from them ; and they appear then to consist of several parallel bands lying longi¬ tudinally along the muscle, which, when divided by means of fine needles, appear to be composed of still smaller bundles of fibres lying in the same direction ; which, when examined by a powerful magnifier, and in a favonrable light, appear twisted like a small cord. The muscular fibres of the spider, which are much lar¬ ger than those of the caterpillar, consist of two different substances, one soft and the other hard 5 the latter be¬ ing twisted round the former spirally, and thus giving it the twisted appearance just mentioned. There is nothing in the caterpillar similar to the brain in man. We find indeed in the head of this insect a part from which all the nerves seem to pro¬ ceed but this part is entirely unprotected, and so small, that it does not occupy mie-fifth part of the head; the surface is smooth, and has neither lobes nor any anfractuosity like the human brain. But if we call this a brain in the caterpillar, we must say that it has thirteen: for there are twelve other such parts following each other in a straight line, all of them of the same substance with that in the head, and nearly of the same size; and from them, as well as from that in the head, the nerves are distributed through the body. The spinal marrow in the cossus goes along the belly \ is very small, forking out at intervals, nearly of the same thickness throughout, except at the gan¬ glions, and is not enclosed in any ca'e. It is by no means so tender as in man ; but has a great degree of tenacity, and does not break without a consider¬ able degree of tension. The substance of the gan¬ glion differs from that of the spinal marrow, as no vessels can be discovered in the latter j but the for¬ mer MIC [ 37 ] MIC Micro- mer are full of very delicate ones. There are 94 scope, principal nerves, which divide into inumerable ramifi- v cations. The cossus has two large tracheal arteries, creeping under the skin close to the spiracula: one at the right and the other at the left side of the insect, each of them communicating with the air by means ol nine spiracula. They are nearly as long as the whole ca¬ terpillar •, beginning at the first spiraculum, and ex¬ tending somewhat farther than the last •, some branches also extending quite to the extremity of the body. Hound each spiraculum the trachea pushes forth a great number of branches, which are again divided into smaller ones, and these further subdivided and spread through the whole body of the caterpillar. The tracheal artery, with all its numerous ramifications, are open elastic vessels, which may be pressed close toge¬ ther, or drawn out considerably, but return imme¬ diately to their usual size when the tension ceases. They are naturally of a silver colour, and make a beautiful appearance. This vessel, with its principal branches, is composed of three coats, which may be separated from one another. The outmost is a thick membrane furnished with a great variety of fibres, which describe a vast number of circles round it, com¬ municating with each other by numerous shoots. 'I he second is very thin and transparent, without any par¬ ticular vessel being distinguishable in it. The third is composed of scaly threads, generally ol a spiral form ; and so near each other as scarcely to leave any inter¬ val. They are curiously united with the membrane which occupies the intervals ; and form a tube which is always open, notwithstanding the flexure of the ves¬ sel. There are also many other peculiarities in its struc¬ ture. The principal tracheal vessels divide into 1326 different branches. The heart of the cossus is very different from that of larger animals, being almost as long as the animal it¬ self. It lies immediately under the skin at the top of the back, entering the head, and terminating near the mouth. Towards the last rings of the body it is large and capacious, diminishing very much as it approaches the head, from the fourth to the twelfth division. On both sides, at each division, it has an appendage, which partly covers the muscles of the back, but which, growing narrower as it approaches the lateral line, it forms a number of irregular lozenge-shaped bodies.— This tube, however, seems to perform none of the func¬ tions of the heart in larger animals, as we find no ves¬ sel opening into it which answers either to the aorta or vena cava. It is called the heart, because it is general¬ ly filled with a kind of lymph, which naturalists have supposed to be the blood of the caterpillar; and because in all caterpillars which have a transparent skin, we may perceive alternate regular contractions and dilatations along the superior line, beginning at the eleventh ring, and proceeding from ring to ring, from the fourth ; whence this vessel is thought to be a string or row of hearts. There are two white oblong bodies which join the heart near the eighth division ; and these have been called reiiiform bodies, from their having somewhat of the shape of a kidney. The most considerable part of the whole caterpillar with regard to bulk is the corpus crassum. It is the first and only substance that is seen on opening it.. It forms a kind of sheath which envelopes and covers all Micfo- the entrails, and, introducing itself into the head, enters scope, all the muscles of the body, filling the greatest part of’ "V—-J the empty spaces in the caterpillar. It very much re¬ sembles the configuration ol the human brain, and is of a milk-white colour. The oesophagus descends from the bottom of the mouth to about the fourth division. The fore part, which is in the head, is fleshy, narrow, and fixed by different muscles to the crustaceous parts ot it; the lower part, which passes into the body, is wider, and forms a kind of membranaceous bag, covered with very small muscles y near the stomach it is narrower, and, as it were, confined by a strong nerve fixed to it at distant intervals. The ventricle begins a little above the fourth division, where the oesophagus ends, and finishes at the tenth. It is about seven times as long as broad ; and the anterior part, which is broadest, is ge¬ nerally folded. These folds diminish with the bulk as it approaches the intestines ; the surface is covered with a great number of aerial vessels, and opens into a tube, which M. Lyonet calls the large intestine.—There are three of these large tubes, each of which difters so much from the rest, as to require a particular name to distin¬ guish it from them. The two vessels from which the cossus spins its silk are often above three inches long, and are distinguished into three parts ; the anterior, intermediate, and poste¬ rior. It has likewise two other vessels, which are sup¬ posed to prepare and contain the liquor lor dissolving the wood on which it feeds. Fig. 55. shows the wing of an earwig magnified; plate a represents it of the natural size. The wings ol thisCCCXLIV. insect are so artificially folded up under short cases, fiS- 55- that few people imagine they have any. Indeed, they very rarely make use of their wings. The cases under which they are concealed are not more than a sixth part of the size of one wing, though a small part of the wing may be discovered, on a careful inspection, pro¬ jecting from under them. The upper part ol the wing is crustaceous and opaque, but the under part is beau¬ tifully transparent. In putting up their wings, they first fold back the parts AB, and then shut up the ribs like a fan; the strong muscles used for this purpose being seen at the upper part ol the figure. Some of the ribs are extended from the centre to the outer edge; others only from the edge about half wTay : but they are all united by a kind of baud, at a small but equal distance from the edge ; the whole evidently contrived to strengthen the wing, and facilitate its various mo¬ tions. The insect itself differs very little in appearance in its three different states. De Geer asserts, that the female hatches eggs like a hen, and broods over her young ones as a.hen does. Fig. 56. represents a wing of the hemerobms pcrla Fig. magnified. It is an insect which seldom lives more than two or three days.—The wings are nearly of a length, and exactly similar to one another. They are composed of fine delicate nerves, regularly and elegant¬ ly disposed as in the figure, beautifully adorned with hairs, and lightly tinged with green. The body is of a fine green colour ; and its eyes appear like two bur¬ nished beads of gold, whence it has obtained the name of golden eye. This insect lays its eggs on the leaves of the plum or the rose tree; the eggs are of a white colour, MIC C 58 ] MID Micro- colour, a-ul each of them fixed to a little jtcdicle or it. These parts are drawn separately at 1’. C, 1), It- ' (scttjie. foot-stalk, by which means they stand oil a little from De Geer observes, that only the females suck the blood Sn v 1 .1 the leaf, appearing like the fructification of some of of animals •, and Reaumur informs us, that having made the mosses. The larva proceeding from these eggs re- one, that had sucked its fill, disgorge itseif, the blood sembles that of the coccinella or lady-cow, hut is much it threw up appeared to him to be more than the "hole more handsome. Like that, it feeds upon aphides or body of the insect could have contained. ILe natural pucerons, sucking their blood, and forming itself a case size of this apparatus is shown aty. with their dried bodies j in which it changes into the l ig- 61. shows a hit of the skin of a lump-fish (cy-Fig. gj, ..pupa state, from whence they afterwards emerge in the clopterus) magnified AY hen a good specimen of this form of a fly. can he procured, it forms a most beautiful object. I he Fig. E, F, I, represent the dust of a. moth’s wing tubercles exhibited in the figure probably secrete an magnified. This is of different figures in different unctuous juice. moths. The natural size of these small plumes is re- Fig. 62. shows the scale of a sea perch found on the Fig. Si. presented at H. English coast •, the natural size is exhibited at h. I'ig. 57. Fig. 57. shows a part of the cornea of the libellula Fig. 63. the scale of an haddock magnified ; its na-Fig. 53. i •magnified. In some positions of the light, the sides of tural size as within the circle. the hexagons appear of a fine gold colour, and divided ^4* ^lfc: scuie a parrot fish from the YV est In-Fig. 6_j., by three parallel lines. The natural size of the part dies magnified ; l the natural size of it. magnified is shown at b. Fig. 65. the scale of a kind of perch in the AY est In-Fig. 53. 11 Fig. 58. Fig. 58. shows the part c of a lobster’s cornea mag- dies magnified ; k the natural size of the scale. nlfied. Fig. 66. part of the skin of a sole fish, as viewed Fig. 65. Fig. 59. Fig. 59. shows one of the arms or horns of the lepas through an opaque miscroscope j the magnified part in anatifera, or barnacle, magnified j its natural size being its real size, shown at l. represented at d. Each horn consists of several joints, The scales of fishes afford a great variety of beauti- and each joint is furnished on the concave side of the ful objects for the microscope, borne are long j others arm with long hairs. AATen viewed in the microscope, round, square, &c. varying considerably not only in the arms appear rather opaque ; hut they may he ren- different fishes, but even in different parts of the same dered transparent, and become a most beautiful object, fish. Leemvenhoeck supposed them to consist of an by extracting out of the interior cavity a bundle of infinite number of small scales or strata, of which those longitudinal fibres, which runs the whole length of the next to the body of the fish are ihe largest. AA hen arm. Mr Needham thinks that the motion and use of viewed by the microscope, we find some of them or- these arms may illustrate the nature of the rotatory mo- namented with a prodigious number of concentric flu- tion in the wheel-animal. In the .midst of the arms is tings, too near each other, and too fine, to be easily an hollow trunk, consisting of a jointed hairy tube, enumerated. These flutings are frequently traversed by which encloses a long round tongue that can be push- others diverging from the centre of the scale, and ge- ed occasionally out of the tube or sheath, and retract- nerally proceeding from thence in a straight line to the ed occasionally. The mouth of the animal consists of circumference. six laminae, which go off with abend, indented like a lor more full information concerning these and saw on the convex edge, and by their circular disposi- other microscopical objects, the reader may consult tion are so ranged, that the teeth, in the alternate ele- Mr Adams’s Essays on the Microscope, who has made vation and depression of each plate, act against what- the most valuable collection that has yet appeared on ever comes between them. The plates are placed to- the subject. See also the articles Animalcule, Cry- gether in such a manner, that to the naked /.'•///}T MICROSCOPIC MIC R O S C O r IC OBJE C TS PLATE CCCXLIIL Fig. 44. Fio. 46 ITT Fio 4 8. Fiff. 49. J)LVi»>iou l Division 1 jL.TCih-cn Sculp? PLATE CCCXLIV. MICROSCOPIC OBJECTS, tyi/y. ‘33. ^■'37 J>y^iliQQL HC-bWn'liiL/ Snify.' Jo MID l 39 1 MID Midas veal it from apprehension of the king’s resentment, he j| opened a hole in the earth, and after he had whispered Middle- there that Midas had the ears of an ass, he covered the bui'»' , place as before, as if he had buried his words in the ground. On that place, as the poets mention, grew a number of reeds, which when agitated by the wind ut¬ tered the same sound that had been buried beneath, and published to the wrorld that Midas had the ears of an ass. Some explain the fable of the ears of Midas, by the supposition that he kept a number of informers and spies, who were continually employed in gathering every seditious word that might drop from the mouths of his subjects. Midas, according to Strabo, died of drinking bull’s hot blood. This he did, as Plutarch mentions, to free himself from the numerous ill dreams which continually tormented him. Midas, according to some, was son of Cybcle. He built a town which he called Ancijrce. Midas, Ear-shell. See Haliotis, Conchology Index. MID-heaven, the point of the ecliptic that culmi¬ nates, or in which it cuts the meridian. MIDDLEBURG, one of the Friendly islands in the South sea. The island was first discovered by Tasman, a Dutch navigator, in January 1642-3 ; and is called by the natives Ea-Oo-whe: it is about 16 miles from north to south, and in the widest part about 8 miles from east to west. The skirts are chiefly laid out in plantations, the south-west and north-west sides especially. The interior parts are but little cultiva¬ ted, though very capable of it : but this neglect adds greatly to the beauty of the island ; for here are agree¬ ably dispersed groves of cocoa-nuts and other trees, lawns covered with thick grass, here and there planta¬ tions and paths leading to every part of the island, in such beautiful disorder, as greatly to enliven the pro¬ spect. The hills are low 5 the air is delightful 5 but unfortunately water is denied to this charming spot. Yams, with other roots, bananas, and bread fruit, are the principal articles of food ; but the latter appeared to be scarce. Here is the pepper-tree, or ava ava, with which they make an intoxicating liquor, in the same disgusting manner as is practised in the Society islands. Here are several odoriferous trees and shrubs, particularly a species of the lemon tribe; and the bo¬ tanical gentlemen met with various new species of plants. Here also are a few hogs and fowls. There are no towns or villages } most of the houses are built in plantations, which are laid out in different parts, with no other order than what convenience re¬ quires. They are neatly constructed, but are less roomy and convenient than those in the Society isles. The floors are a little raised, and covered with thick •strong mats. The same sort of matting serves to enclose them on the windward side, the others being open. They have little areas before most of them, which are planted round with trees or ornamental shrubs, whose fragrance perfumes the air. Their household furniture consists of a few wooden platters, cocoa-nut shells, and pillows made of wood, and shaped like four-footed stools or forms : their common clothing, with the addi¬ tion of a mat, serves them for bedding. The natives are of a clear mahogany or ehesnut brown, with black hair, in short frizzled curls, which seems to be burnt at the tips j their beards are cut or shaven. The general stature of the men is equal to our middle size, from five feet three to five feet ten inches; the proportions of the body are very fine, and the contours of the limbs extremely elegant, though something more muscular than at Otaheite, which may be owing to a greater and more constant exertion of strength in their agriculture and domestic economy. Their features are extremely mild and pleasing j and differ from the old Otaheitan faces in being more ob¬ long than round, the nose sharper, and the lips rather thinner. The women are, in general, a few inches shorter than the men, but not so small as the lower class of women at the Society islands. The practice of puncturing the skin, and blacking it, which is called tattoiving, is in full force among the men here, for their belly and loins are very strongly marked in configurations more compounded than those at Ota¬ heite. The tenderest parts of the body were not free from these punctures ; the application of which, besides being very painful, must be extremely dangerous on glandulous extremities. The men in general go almost naked, having only a-small piece of cloth round the loins, but some wrap it in great abundance round them from their waist : this cloth is manufactured much like that at Ota¬ heite, but overspread with a strong glue, which makes it stiff, and fit to resist the wet. The women are likewise covered from the waist downwards : they often have loose necklaces, consisting of several strings of small shells, seeds, teeth of fishes ; and in the middle of all, the round operculum, or cover of a shell as large as a crown-piece. The men frequently wear a string round their necks, from which a mother-of-pearl shell hangs down on the breast j both the ears of the wo¬ men were perforated with two holes, and a cylinder cut out of tortoise-shell or bone was stuck through both the holes. The most remarkable circumstance observed of this people was, that most of them wanted the little finger on one, and sometimes on both hands: the difference of sex or age did not exempt them from this amputation ; for even among the few children that were seen running about naked, the greater part had already suffered such loss. This circumstance was- observed by Tasman. Another singularity which was observed to be very general among these people, was a round spot on each cheek-bone, which appeared to have been burnt or blistered. On some it seemed to have been recently made, on others it was covered with scurf, and many had only a slight mark of its former existence: how, or for what purpose it was made, could not be learnt. The women here, in ge¬ neral, were reserved ; and turned, with disgust, from the immodest behaviour of ungovernable seamen : there were not, however, wanting some who appeared to be of easy virtue, and invited their lovers with lascivious gestures. The language spoken here is soft, and not unpleasing; and whatever they said was spoken in a kind of singing tone. Onvai and Mahine, who wrere both passengers on board the ship, at first declared that the language was totally new and unintelligible to them; however the affinity of several words being pointed out, they soon caught the particular modifica¬ tion of this dialect, and conversed much better with the natives than any on board the ships could have- done, after a long intercourse. They have the neat¬ est. Middlc- btirg, Middle- ham. MID [40 est ornaments imaginable, consisting of a number of little flat sticks, about five inches long, of a yellow wood like box, firmly and elegantly connected toge¬ ther at the bottom by a tissue of the fibres of cocoa- nut, some of which were of their natural colour, and others dyed black ; the same fibres w'ere likewise used in the making of baskets, the taste of which was high¬ ly elegant, and varied into different forms and pat¬ terns. Their clubs are of a great variety of shapes, and many of them so ponderous as scarcely to be ma¬ naged with one hand. The most common form was quadrangular, so as to make a rhomboid at the broad end, and gradually tapering into a round handle at the other. Far the greater part were carved all over in itiany chequered patterns, which seemed to have re¬ quired a long space of time, and incredible patience, to work up ; as a sharp stone, or a piece of coral, are the only tools made use of: the whole surface of the plain clubs was as highly polished as if an European workman had made them with the best instruments: Besides clubs, they have spears of the same wood, which were sometimes plain sharp-pointed sticks, and sometimes barbed with a sting-ray’s tail. They haya likewise hows and arrows of a peculiar construction j the bow, which is six feet long, is about the thick¬ ness of a little finger, and when slack, forms a slight curve ; its convex part is channelled with a single deep groove, in which the bow-string is lodged. The arrow is made of reed, near six feet long, and pointed with hard wood: when the bowT is to be bent, instead of drawing it so as to increase the natural curvature, they draw it the contrary way, make it perfectly straight, and then form the curve on the other side. Most of their canoes have outriggers, made of poles ; and their workmanship is very admirable : two of these canoes are joined together with a surprising ex¬ actness, and the whole surface receives a very cu¬ rious polish. Their paddles have short broad blades, something like those at Otaheite, but more neatly wrought and of better wood. They keep their dead above ground, after the man¬ ner of the Society islands j as a corpse was seen depo¬ sited on a lowr hut. Here were seen several men and women afflicted with leprous diseases, in some of whom the disorder had risen to a high degree of virulence : one man in particular had his back and shoulders covered with a large cancerous ulcer, which was perfectly livid with¬ in, and of a bright yellow all round the edges. A woman was likewise unfortunate enough to have her face destroyed by it in the most shocking manner j there was only a hole left in the place of her nose 5 her cheek was swelled up, and continually oozing out a purulent matter : and her eyes seemed ready to fall out of her head, being bloody and sore. Though these were some of the most miserable objects that could possibly he seen, yet they seemed to be quite unconcerned about their misfortunes, and traded as briskly as any of the rest. MIDDLEHAM, a town in the north riding of Yorkshire, situated on the river Ure, 255 miles from London. It had once a castle, where was born Ed¬ ward prince of Wales, only son of Richard HI; and is noted for a woollen manufactory and frequent horse¬ races. Its market is on Monday; and fairs Nov. 6. and 7. The town stands on a rising ground ; and the ] MID castle was formerly moated round by the help oi a middle- spring conveyed in pipes from the higher grounds. The ham population in 1811 was 714. _ MIDDLESEX, a county of England, which de- ;v K ^ rives its name from its situation amidst the three king¬ doms of the. East, West, and South Saxons. It is bounded on the north by Hertfordshire ; on the south by the river Thames, which divides it from Surry j on the west by the river Colne, which separates it from Buckinghamshire ; and on the east by the river Lea, which divides it from Essex. It extends about 23 miles in length, but hardly 14 in breadth, and is not more than 115 in circumference j but as it compre¬ hends the two vast cities of London and Westminster, which are situated in the south-east part of the coun¬ ty, it is by far the wealthiest and most populous county in England. It is divided into 602 liberties, containing 200 parishes, besides a vast number of cha¬ pels of ease, and 5 market towns, exclusive of the cities of London and Westminister. The air is very pleasant and healthy. The soil, which is gravelly, produces plen- ty of corn, and the county abounds with fertile meadows and gardeners grounds. In a word, the greater part of the county is so prodigiously assisted by the rich com¬ post from London, that the whole of the cultivated part may be considered as a garden. The natural produc? tions are cattle, corn, and fruit; but its manufactures are too many to be enumerated here, there being hard¬ ly a single manufacture practised in Great Britain but what is also established in this county.—Though Lon¬ don is the chief city, Brentford is the county town where the members of parliament are elected. In 1811 it contained 126,269 houses, and 904,358 inhabitants in towns, and 8670 houses, and 48,918 inhabitants in the country, making altogether 953,276 inhabitants. See Middlesex, Supplement. Middlesex is also the name of four different coun¬ ties in the United States of America 5 one of them is in Massachussets, another in Connecticut, a third in New Jersey, and the fourth in Virginia. MIDDLETON, Du Conyers, a very celebrated English divine, the son of a clergyman in Yorkshire, was born at Richmond in 1683. He distinguished him¬ self, while fellow of Trinity college, Cambridge, by his controversy with Dr Bentley lus master, relating to some mercenary conduct ol the latter in that station. He afterwards had a controversy with the whole body of physicians on the dignity of the medical profession } concerning which he published Dt mediiorum apud ve~ teresRomcmos degentium conditione dissertatio; qua, con¬ tra viros celebernmos Jacobitm Spomum et Richardarn Meadium, servilem atquc ignolnlem earn fuisst ostevdi- tnr: and in the course of this dispute much resentment and many pamphlets appeared. Hitherto he had • stood well with his clerical brethren} but he drew the resentment of the church on him in iq2g, by writing “ A Letter from Rome, showing an exact conformity between Popery and Paganism,” &c. ; as this letter, though politely written, yet attackedPopish miracles with a gaiety that appeared dangerous to the cause of miracles in general. Nor were his Objections to Dr Water- land’s manner of vindicating Scripture against Tindal’s “ Christianity as old as the Creation,” looked on in a more favourable point of view. In 1741, came out his great work, “ The history of the life of M. Tullius Cicero,” Midship- frame. MID [41 Middleton Cicero,” .2 vols 4to : which is indeed a fine perform- I! ance, and will probably be read as long as taste and polite literature subsist among us: the author has ne¬ vertheless fallen into the common error of biographers, who often give panegyrics instead of history. In J748, he published, “ A free inquiry into the miracul¬ ous powers which are supposed to have subsisted in the Christian church from the earliest ages, through several successive centuries.” He was now attacked from all quarters j but before he took any notice of his anta¬ gonists, he supplied them with another subject, in “ An examination of the Lord Bishop of London’s discourses concerning the use and extent of prophecy,” &c. Thus Dr Middleton continued to display talents and learning, which are highly esteemed by men of a free turn of mind, but by no means in a method calculated to invite promotion in the clerical line. He was in 1723 chosen principal librarian of the public library at Cambridge ; and if he rose not to dignities in the church, he was in easy circumstances, which permitted him to assert a dignity of mind often forgotten in the career of preferment. He died in I75°» at Hildersham in Cambridgeshire, an estate of his own purchasing } and in J752, all his works, except the life of Cicero, were collected in 4 vols 4to. MIDDLEVYICH, a town of Cheshire, 167 miles from London. It stands near the conflux of the Croke and Dan, where are two salt water springs, from which are made great quantities of salt, the brine being said to be so strong as to produce a full fourth part salt. It is an ancient borough, governed by burgesses 5 and its parish extends into many adjacent townships. It has a spacious church. By means of inland navigation, it has communication with the rivers Mersey, Dee, Kibble, Ouse, Trent, Darwent, Severn, Humber,Thames, Avon, &c.; which navigation, including its windings, extends above 500 miles, in the counties of Lincoln, Notting¬ ham, York, Lancaster, Westmoreland, Stafford, War¬ wick, Leicester, Oxford, Worcester, &c. The river Wheelock, after a course of about 12 miles from Mow- cop-hill, runs into the Dan a little above this town. Its population in 1811 was 1232. MIDHURST, a town of Sussex, 52 miles from London, has been represented in parliament ever since the 4th of Edward II. It is a neat small town, on a hill surrounded with others, having the river Arun at the bottom j and is a borough by prescription, govern¬ ed by a bailiff, chosen annually by a jury at a court- leet of the lord of the manor. MIDIAN, or Madian, in Ancient Geography, a town on the south side of Arabia Petrsea, so called from one of the sons of Abraham by Keturah.—Ano¬ ther Midian, near the Arnon and iEoplis, in ruins in Jerome’s time. With the daughters of these Midianites the Israelites committed fornication, and were guilty of idolatry. A branch of the Midianites dwelt on the Arabian gulf, and were called Kenites: some of whom turned proselytes, and dwelt with the Israelites in the land of Canaan. MID-LOTHIAN. See Lothian and Edinburgh¬ shire. MIDSHIP-frame, a name given to that timber, or combination of pieces formed into one timber, which determines the extreme breadth of the ship, i/Yol. XIV. Part I. f ] MID as well as the figure and dimension of ail the inferior timbers. In the article SmP-Building, the reader will find a full explanation of what is meant by a frame of tim¬ bers. He will also perceive the outlines of all the principal frames, with their gradual dimensions, Irom the midship-frame, delineated in the plane of projection annexed to that article. MIDSHIPMAN, a sort of naval cadet, appointed by the captain of a ship of war, to second the orders of the superior officers, and assist in the necessary busi¬ ness of the vessel, either aboard or ashore. The number of midshipmen, like that of several other officers, is always in proportion to the size of the ship to which they belong. Thus a first-rate man of war has 24, and the inferior rates a suitable number in pro¬ portion. No person can be appointed lieutenant with¬ out having previously served two years in the royal navy in this capacity, or in that of mate, besides having been at least four years in actual service at sea, either in merchant ships or in the royal navy. Midshipman is accordingly the station in which a young volunteer is trained in the several exercises ne¬ cessary to attain a sufficient knowledge of the machi¬ nery, movements, and military operations of a ship, to qualify him for a sea officer. On his first entrance in a ship of war, every midship¬ man has several disadvantageous circumstances to en¬ counter. These are partly occasioned by the nature of the sea service 5 and partly by the mistaken preju¬ dices of people in general respecting naval discipline, and the genius of sailors and their officers. No cha¬ racter, in their opinion, is more excellent than that of the common sailor, whom they generally suppose to be treated with great severity by his officers, drawing a comparison between them not very advantageous to the latter. The midshipman usually comes aboard tinc¬ tured with these prejudices, especially if his education has been amongst the higher rank of people ; and if the officers happen to answer his opinion, he conceives an early disgust to the service, from a very partial and incompetent view of its operations. Blinded by these prepossessions, he is thrown off his guard, and very soon surprised to find, amongst those honest sailors, a crew of abandoned miscreants, ripe for any mischief or villany. Perhaps, after a little observation, many of them will appear to him equally destitute of grati¬ tude, shame, or justice, and only deterred from the commission of any crimes by the terror of severe pu¬ nishment. He will discover, that the pernicious ex¬ ample of a few of the vilest in a ship of war is too often apt to poison the principles of the greatest num¬ ber, especially if the reins of discipline are too much relaxed, so as to foster that idleness and dissipation, which engender sloth, diseases, and an utter profligacy of manners. If the midshipman on many occasions is obliged to mix with these, particularly in the exercises of extending or reducing the sails in the tops, he ought resolutely to guard against this contagion, with which the morals of his inferiors may be infected. He should, however, avail himself of their knowledge, and acquire their expertness in managing and fixing the sails and rigging, and never suft'er himself to be excelled by an inferior. He will probably find a virtue in almost F every Midship- frame MID [ 42 ] MID Midship- every private sailor, which is entirely unknown to man. many of his officers: that virtue is emulation, which 1 ' v is not indeed mentioned amongst their qualities by the gentlemen of terra firina, by whom their characters are often copiously described with very little judgment. There is hardly a common tar who is not envious of superior skill in his fellows, and jealous on all occa¬ sions to be outdone in what he considers as a branch of his duty: nor is he more afraid of the dreadful con¬ sequences of whistling in a storm, than of being stig¬ matized with the opprobrious epithet of lubber. For¬ tified against this scandal, by a thorough knowledge of his business, the sailor will sometimes sneer in pri¬ vate at the execution of orders which to him appear awkward, improper, or unlike a seaman. Nay, he will perhaps be malicious enough to suppress his own judgment, and, by a punctual obedience to command, execute whatever is to he performed in a manner which he knows to be improper, in order to expose the person commanding to disgrace and ridicule. Little skilled in the method of the schools, he considers the officer who cons his lesson by rote as very ill qualified for his station, because particular situations might ren¬ der it necessary for the said officer to assist at putting his own orders in practice. An ignorance in this prac¬ tical knowledge will therefore necessarily he thought an unpardonable deficiency by those who are to tollow his dix-ections. Hence the midshipman who associates with these sailors in the tops, till he has acquired a competent skill in the service of extending or reducing the sails, &c. will be often entertained with a number of scurrilous jests, at the expence of his superiors. Hence also he will learn, that a timely application to those exercises can only prevent him from appearing in the same despicable point of view, which must cer¬ tainly be a cruel mortification to a man of the smallest sensibility. If the midshipman is not employed in these services, which are undoubtedly necessary to give him a clearer idea of the different parts of his occupation, a variety of other objects present themselves to his attention. Without presuming to dictate the studies which are most essential to his improvement, we could wish to recommend such as are most suitable to the bent of his inclination. Astronomy, geometry, and mechanics, which are in the first rank of science, are the mate¬ rials which form the skilful pilot and the superior ma- Midship- riner. The theory of navigation is entirely derived man, from the two former, and all the machinery and move-, M'dwxfc. ments of a ship are founded upon the latter. I he ac¬ tion of the wind upon the sails, and the resistance of the water at the stem, naturally dictate an inquiry into the property of solids and fluids \ and the state of the ship, floating on the water, seems to direct his appli¬ cation to the study of hydrostatics, and the effects of gravity. A proficiency in these branches of science will equally enlarge his views, with regard to the ope¬ rations of naval war, as directed by the efforts of powder and the knowledge of pi-ojectiles. The most effectual method to excite his application to those stu¬ dies, is, perhaps, by looking round the navy, to ob¬ serve the characters of individuals. By this inquiry lie will probably discover, that the officer who is emi¬ nently skilled in the sciences, will command universal respect and approbation ; and that whoever is satisfied with the despicable ambition of shining the hero of an assembly, will be the object of universal contempt. The attention of the former will be engaged in those studies which ai'e highly useful to himself in particular, and to the sei'vice in general. The employment of the latter is to acquire those superficial accomplishments that unbend the mind from every useful science, emas¬ culate the judgment, and render the hero infinitely more dexterous at falling into his station in the dance than in the line of battle. Unless the midshipman has an unconquerable aver¬ sion to the acquisition of those qualifications which are so essential to his improvement, he will very rare¬ ly want opportunities of making a progress therein. Kvery step he advances in those meritorious employ¬ ments will facilitate his accession to the next in order. If the dunces, who are his officers or messmates, are rattling the dice, roaring bad vex-ses, hissing on the flute, or scraping discoi’d from the fiddle, his attention to more noble studies will sweeten the hours of relaxation. He should recollect, that no example from fools ought to in¬ fluence his conduct, or seduce him from that laudable ambition which his honour and advantage are equally concerned to pursue. MIDWIFE, one whose profession is to deliver wo* men in labour. See Midwifery. MIDWIFERY, Definition. rT'HE art of assisting women in labour. In a more -I- extended sense, it is understood to comprehend al¬ so the treatment of the diseases of women and children. In this work we shall consider it in the former limited sense, viz. as relating to the birth of the offspring of man. a History of Midwifery.—It must be very obvious that this art must have been almost coeval with mankind: but in Europe it continued in a very rude state till the 17th century, and even after physic and surgery had become distinct professions, it remained almost totally uncultivated. It is a curious fact, that in the empire of China the very reverse of this has taken pb.ee. In that em¬ pire, according to the latest accounts, both physic and surgery are still in a state of the utmost degradation, even more so than among the savages of America j but for some hundred years, the art of midwifery has been practised by a set of men destined to the purpose by order of government. These men, rvho hold in so¬ ciety the same rank which lithotomists did in this coun¬ try about the beginning of last century, are called in whenever a woman has been above a certain number of hours in labour, and employ a mechanical contrivance for M I D W rt»stofy for completing the delivery without injury to the in- — fant. A certain number of such individuals is allotted to each district of a certain population. It is said, that the Chinese government was led to make this provision for alleviating the sufferings of child-bearing women, in consequence of a representa¬ tion, that annually many women died undelivered, and that in the majority of cases the cause of obstruction might have been removed by very simple mechanical expedients* Both Sir George Staunton and Mr Barrow were ignorant of this fact ', and the latter in particular ex¬ pressly mentions, that there are no men-midwives in China. But the writer of this article had his informa¬ tion from a more authentic source than the works of gentlemen who were only a few months in that coun¬ try, and were in a great measure treated as state pri¬ soners. He has it, through the medium of a friend, from a gentleman who resided upwards of twenty years as surgeon to the British factory at Canton, and who had both the ability and the inclination to learn, during the course ef so long a residence, all the customs and prejudices of the natives relating to the preservation of human health. 4 Towards the end of the 17th century, the same causes which had so long before led to the cultivation of midwifery in China produced the same effect in Europe. The dangers to which women are sometimes exposed during labour excited the compassion of the be¬ nevolent ; so that a considerable part of the first hos¬ pital which w^as established for the reception ot the in¬ digent sick, the Hotel Dieu of Paris was appropriated to lying-in women. The opportunities of practice which that hospital af¬ forded, directed the attention of medical men to the numerous accidents which happen during laboui, and to the various diseases which occur after delivery. Pu¬ blic teaching followed, and soon after the custom of -employing men in the practice of midwifery began. From this period the art became rapidly improved j and it is now in many parts of Europe, and particular¬ ly in Great Britain, in as great a state of perfection as physic or surgery. 5 In the year 1725, a professorship of midwifery was established in the university of Edinburgh j and the town-council at the same time ordained, that no woman should be allowed to practise midwifery within the liberties of the city, without having previously ob¬ tained a certificate from the professor of her being pro¬ perly qualified. This salutary regulation has fallen in¬ to desuetude. There can be no doubt that the improvement of the art of midwifery was chiefly in consequence of medical men directing their attention to the subject j but the propriety of men being employed in such a profession is much questioned by many individuals of considerable respectability. « Dr John Gregory, in his Comparative View, p. 22. says, “ every other animal brings forth its-young with¬ out any assistance, but we think a midwife understands it better.” Had this eminent philosopher said, “ other animals content themselves with the clothing which providence has bestowed, but we think it necessary to cover our bodies with the workmanship of weavers, very few in this northern climate would have attended I F E ft Y. 4:5 to the sneer. His son, the present professor, has im¬ proved upon the idea. He seems to suppose that women without any instruction, and of course without any knowledge of the subject, are capable of assisting one another while in labour; and in the sportiveness of his lively imagination, he compares men-midwives to that species of frog, in which, according to the allega¬ tion of Reaumur, the male draws out the ova from the female, or, to use the naturalist’s words, “ accouche la femcllc.''1 It appears to us that this question, on which much declamation has been employed by the parties who have agitated it, may be brought within a very narrow compass. It may be assumed as a fact established be¬ yond the reach of controversy, that sometimes dangers and difficulties occur during labour (from causes to be explained in a subsequent part of this essay), which can be lessened or removed by those only who have an inti¬ mate knowledge of the structure of the human body and of the practice of physic. On such occasions, it must be admitted, medical men alone can be useful. But as such labours occur only in the proportion of twt» or three in the hundred, the general practice might be confided to midwives, if they could he taught to manage ordinary cases, and to foresee and distinguish difficulties or dangers, so as to procure in sufficient time additional assistance. It is on this point that the decision of the question must depend. It consists with the knowledge of the writer of this article, that women may be taught all this. But there are many who allege, that a little knoAvledge being a dangerous thing, midwives acquire a self-sufficiency which renders them averse from call¬ ing in superiar assistance, and that, in consequence, they often ocoasion the mest deplorable accidents both to mother and child. In England this is the popular opi¬ nion, so that there women are almost entirely exclud¬ ed from the practice of midwifery. A similar prejudice against midwives has, it is believed, begun in some parts of Scotland ; but it is presumed this will gradually cease, when it is considered that, in general, the Scotch mjdwives are regularly instructed, and are at the same time both virtuous and industrious. If they attend strictly to their duty, and invariably prefer their pa¬ tients safety to their own feelings or supposed interest, they will deservedly retain the public confidence. But if in cases of difficulty or danger they trust to their own exertions, or from disinterested motives decline the as¬ sistance of able practitioners, and if they interfere in the treatment of the diseases of women and children, they will in a few years be excluded from practice. Division of the subject. In order to exhibit an ac¬ curate view of what relates to the birth of man, we shall consider, in the first place, conception ; secondly, the effects of impregnation ; thirdly, the act of childbear¬ ing ; and lastly, the deviations from the ordinary course which sometimes happen. These topics will form the subjects of the following chapters. or Concpption. 7 Chap. I. Of Conception. Three circumstances are required for conception in s the human race, viz. puberty ; a healthy, vigorous, and natural state of the parts subservient to the operation in both sexes ; and successful sexual intercourse. I. The age of puberty in women differs considerably F 2 ' 44 M I D W I or Con- ce prion. 9 Id IX in different climates. In Europe it takes place com¬ monly between the fourteenth and sixteenth year. This important era is marked by certain changes both in the mind and body. The girl feels sensations to which she had been formerly unaccustomed. She loses a relish for her former amusements, and even for her youthful companions. She seeks solitude, indulges in the de¬ pressing passions, and these are excited by the most ap¬ parently trifling causes. She feels occasionally certain desires which modesty represses j and it is by degrees only that she regains her former tranquillity. The changes in her body are even more strongly marked than those in her mind. Her breasts assume that form which adds to the beauty of her person, and renders them fit for nourishing her infant j and every part of the genital system is enlarged. A periodi¬ cal discharge from the uterus renders the woman perfect. In young men the same causes produce very different effects. The lad, about fifteen or sixteen, feels a great increase of strength j his features expand, his voice be¬ comes rough, his step firm, his body athletic j and he engages voluntarily in exercises which require an exer¬ tion of strength and activity. The changes in his mind are as strongly marked as those in his body. He loses that restless puerility which had distinguished his early years, and becomes capable of attending steadily to one object. His behaviour to the fair sex is sudden¬ ly altered. He no longer shows that contempt for wo¬ men, which he had formerly betrayed. He is softened, approaches them with deference, and experiences a de¬ gree of pleasure in their company, for which he can scarcely account. In him too there is an important change in the condition of the genital organs. 2. Unless the parts which constitute peculiarity of sex be in a healthy, vigorous, and natural state, conception cannot take place. In women, conception is prevented if the organs be too much relaxed; if there be obstruction between the external and internal parts j if any preternatural dis¬ charge take place from the internal parts } if the men¬ strual evacuation be not natural in every respect, and if the appendages of the uterus, called fallopian tubes, and ovaria, be not of the natural structure. In men, the same circumstance happens if the organs lie too much relaxed ; if the orifice of the urethra be in an improper situation •, if the urethra be diseased j if the testes be not in a natural healthy state ; and if there be any defect in the erectores penis, which prevents the proper erection of that organ. 3. The sexual intercourse cannot be successful unless somewhat necessary for conception be furnished by both sexes. This consists in the male of a fluid secreted by the testes} and in the female, of a detachment of a substance, supposed to resemble a very minute vesicle situated in the ovarium, and called by physiologists ovum. Each ovarium contains a number of these vesi¬ cles. After every conception, certain marks of the detachment of the ovum remain in the respective ovarium. When the circumstances required for conception con¬ cur, a being is produced which generally resembles both parents. This resemblance is most strikingly marked in the human subject, when one of the parents 3 F E R Y. Chap. I. is an European, and the other an African. What is of Con- called a mulatto is produced. ception. The human race possesses the power of propagation in common with all the other species of the animal kingdom, and also, it has been said, with the vegetable kingdom. As generation then, as it has been styled, is common to two of the kingdoms of nature, it has been imagined by ingenious men, that this wonderful operation is regulated in both by a certain general law. But they have differed much in their account of this law. The question at issue between the two parties is whether the embryos of animals be prepared by the sexual in¬ tercourse out of inorganic materials, or whether they pre-exist in the bodies of animals, and are only deve¬ loped as it were by that intercourse. The former of these opinions is called the doctrine of epigenesis, the latter that of evolution. Both doctrines have been maintained with much in¬ genuity by equally respectable authorities. Negative arguments have been adduced in favour of the one, positive in support of the other, and it must be confess¬ ed that the balance between them seems nearly equal. The pre-existence of ova in the oviparous animals ap¬ pears a positive argument in favour of evolution ; but the satirical remark of a late witty author, * that, were * Blumen- this theory true, every individual of the human race&«cA. must have been lodged in the ovaria of our first parent, by affording a negative argument in favour of epigenesis, restores the balance. The various arguments advanced on each side by the opposite parties in this dispute are so very numerous, that we cannot attempt to detail them in this work ; and on a subject which has divided the opinions of so many able physiologists, it would be presumption to de¬ cide peremptorily. If generation be regarded as an animal operation, one is led to inquire whether the product be the result of the combined influence of both sexes, or whether it be produced by either sex alone. The first opinion was generally adopted by physiolo- ^ gists, till about the end of the J7th century, when an accidental discovery convinced many that the embryo was produced by the male parent alone j and another discovery some years afterwards again overturned that opinion, and rendered it believed by not a fewr that the embryo is furnished exclusively by the female parent. Several circumstances concurred to render the first opinion probable *, the structure of the organs which con¬ stitute peculiarity of sex in both parents, the circum¬ stances necessary for successful impregnation, and the similitude of children to both parents, appear very strong arguments in its favour. The second theory, although first brought into vogue i4 about the end of the 17th century by the discoveries of Leeuwenhoeck, had been formerly proposed by the fol¬ lowers of Pythagoras. Their argument was analogy: the seed, said they, is sown in the earth, nourished and evolved there j so the male semen is sown in the uterus, and in the same manner nourished and evolved. Leeuwenhoeck’s discovery seemed a more conclusive argument in favour of the theory than vague analogy. He iChap. I. M I D W I F E K Y. 45 is Of Con- He observed innumerable animalcula in the seminal coption. 0f j|ie raales 0f many animals. These he imagined ^ to be embryos. But as animalcula of apparently the same nature have been observed in many animal fluids besides the semen masculinum, the' opinion of Leeuwenhoeck and the theory itself are overturned. It tvas owing principally to the labours, industry, and ingenuity of Baron Haller, that the third theory, that of the pre-existing germ, became fashionable. His observations seem to contain a demonstration of the fact. Those Avho have adopted this theory, imagine that the semen masculinum possesses the power of stimulating the various parts of the pre-existing embryo. And hence they attribute the similitude to both parents, and particularly the appearance of the hybrid productions, to that fluid nourishing certain parts, and new-arranging others. But if this \yere true, then the semen masculi¬ num of all animals should possess the power of stimulat¬ ing the germs of all female animals 5 and besides, in each class of animals it should possess certain specific powers of giving a direction to the growth of parts. Experi¬ ence, however, has not proved this to be the case, for the hybrid productions are very limited j and we may be permitted perhaps, without the imputation of arro¬ gance in pretending to search into the intentions of the Author of nature, to observe, that had the semen mas¬ culinum been possessed of such poAvers, the whole spe¬ cies of animals Avould have been soon confounded, and the Avhole animal kingdom Avould soon have returned to that chaos from Avhich it has been allegorically said it originated. Yet avc are reduced to the alternative of either re¬ jecting the theory, or of believing that the semen does possess the poAvers alluded to. If we examine attentive¬ ly the anatomical discovery on Avhich this theory is built, avc shall perhaps be inclined to believe that the foundation of the whole is very insufficient; and hence to conclude that the great superstructure is in a very tottering condition. If it be possible that the attach¬ ment of the chick to the yolk of the egg should be in consequence of inosculation, the theory must fall to the ground. Haller has endeavoured to obviate this objec¬ tion, but not Avith his usual judgment. Tavo circumstances, hoAvever, seem to sIioav that the attachment is really by inosculation : 1. That vessels are seen in the membrane of the yolk evidently con¬ taining blood before the heart of the chick begins to beat •, yet these vessels afterwards appear to depend on the vascular system of the chick. And, 2. That in many animals, as in the human subject, the umbilical cord seems to be attached to the abdomen by inoscula¬ tion } for there is a circle round the root of the cord Avhich resembles a cicatrix, and within a I’cav days af¬ ter birth, the cord uniformly drops oft’ at that very circle, Avhatever portion may have been retained after delivery. There is one objection equally applicable to all the three theories, viz. the difficulty of explaining the steps of the process. A variety of explanations have been offered by ingenious men. Spallanzani and Mi- John Hunter lately, Haller and Bonnet formerly, have ren¬ dered themselves conspicuous on this subject. Spallan¬ zani, in particular, appears to many to have produced, \6 by his artificial impregnation, the most convincing Effects of proofs of the pre-existence of the germ. But to what Impregna- do his celebrated experiments amount? They show, that, tlon' , in all animals it is necessary that the semen masculinum '' should be applied to the someAvhat expelled by the fe¬ male during the coitus, otherwise impregnation cannot take place. But was not this universally acknoAvledged before the abbe Avas born ? In the unfortunate frogs who were the subjects of his experiments, the whole operation of generation was completed except the ap¬ plication ol the male semen to the substances expelled by the female. Nature, by establishing that the busi¬ ness should be carried on in water, sIioavs that the se¬ men must be diluted, otherwise it cannot fecundate. The abbe only imitated nature. He left the question in the state in which he found it. His experiment on the bitch may appear more conclusive; hut alas ! it has never succeeded Avith any person but himself. On the whole, since the process of generation is so obscure that no rational explanation of it has yet been ofl’ered, are Ave not entitled to conclude that the gene¬ ral theory which accounts most satisfactorily for the various phenomena which impregnation exhibits is the best 5 and consequently, that the product of genera¬ tion cannot pre-exist in the body of either parent exclu¬ sively ? Chap. II. Effects of Impregnation. 18 In consequence of impregnation, certain important changes take place in the uterine system of the human subject. We shall consider the natural changes only. On some occasions, there are morbid changes •, but avc shall not notice them, except in so far as some of them serve to illustrate the nature of the usual ones. The first visible change is on the ovarium. One of those organs swells out at one point like a small papilla, then hursts, and someAvhat is discharged. A substance is found in the ovarium after this, which k, is called corpus luteum. Rosderer has described very accurately its appearance a feAV hours after delivery. He says “ corpus luteum locatur in rotundo apice. To- tam ovarii crassitiem occupat, immediate pone ovarii membranam ilia sede tenuiorem locatum ; ab ovario cum quo cellulosse ope cohceret separari sine laesione potest ; nulli peculiar! OArarii rimse respondet: neque canalis in illo excavatus, sed totum solidum est. Lu- teus color est, substantia acinosa, acims admodum com- pactis et ad sese pressis ambitus rotundus. Potest aliquo modo, velut in glandulis suprarenalibus, duplex substantia distingui, corticalis et medullaris; quarum ilia insequa- lis crassitiei 1—2 lin. lutea comprehendit banc medul- larern albam, quee tenuis et membrana quasi callosa, ali- um nucleum flavum includit cassiorem It is \cry * Roederer large soon after conception, and then gradually be- leones, comes smaller; but never totally disappears. Roederer observes, “ post puerperium eo magis contrahi et indu-serm? p rari ilia corpora videntur, quo remotior fit partus $ to. p. 42. qualia videlicet observantur in feminis quae nuper par- tum non ediderunt. “ Lutea corpora quo serius a partu observantur cuncta glandulis suprarenalibus similia esse videntur, dupliqe nempe substantia, exteriore corticali, solida seu flava lutea et nucleo fusco: velut etiam illae glandulae com-x . pressa sunt j-.” In cases where there is a plurality oE °ld' children, p. 30. tion. 80 46 M I I) W Effects of cliildren, there is evidently a corpus krtoum to each Impregua- child. In some, quadrupeds, as in the bitch or cat, the | number of young in the uterus may be generally know 21 by the corresponding Corpora lutea in the ovaria. The next change in the human uterine system which deserves notice is that in the fallopian tubes. 1 hey swell out towards the fimbriated extremity, and form a cavity which has been called antrum, lioederer was the first who observed and accurately delineated this change. He says, p. 14. loco citato, “ In hoc etiam ntero an ¬ trum tuba; dextrae apparet, c.f. tab. i. not. 5. ubi qui- dem in utraque tuba adest, in hujus iconis uteio ad so- lam tubam dextram antrum pertinet. Ad uterum le- mina; octiduum puerperse non longe a fimbria in istius- modi antrum tuba sinistra prominet; dextra quidem sine antro est, sed versus fimbriam ita flectitur ut ultima flexura dimidium pollicem ultra reliquam tubam eflera- tur. Tuba; feminse quae mox a mature partu mortua est, et alterius tres dies puerperse antris quidem carent, sed multum versus sitnbrias dilatantur. An est factu conceptione ista antra nascuntur ? “ In uteri, tab. iv. ovario dextro luteutn corpus latet in uteri feminae octiduum pucrperae ovario sinistro j in uteri, tab. i. ovario sinistro.” He adds, “ ulteriori inda- gine ista antra non indigna esse mihi videntur. Licebit forsan conjectare aliquid liquoris ex vesicula graanana in tubam lapsum et ad introitum morans illam dila- atiut the most astonishing changes arc those produced in the uterus itself. Its parietes separate, a cavity is formed which becomes tilled with a fluid, and the os uteri is closed up. The matter contained within the cavity soon assumes an organized form. . It is said that some time after conception, a small vesicle is observed attached at one point to the internal surface of the uterus : that the rest of the parietes is covered with a gelatinous fluid ; and that the whole internal surface as¬ sumes a flocculent appearance. By degrees the vesicle, which is in fact the ovum containing the embryo, in¬ creases so much in size that it nearly fills the whole cavity in which it is contained, and then its structure becomes the bhject of our senses. The increase of size ill the Uterus is very gradual. It is at first confined almost entirely to the fundus, and it proceeds so slowly that it does not leave the cavity of the pelvis till nearly the fourth month. ' The principal change in the cervix for the first five months is the Com¬ plete closure of the orifice, which is effected by a ge¬ latinous fluid : afterwards the cervix is gradually ex¬ tended, and at last its form is obliterated, the whole uterus becoming like an oval pouch. After the fifth month the increase of size in the ute- , rus is very rapid; The fundus can be just felt above the pubes about the fifth month, but at the end of the ninth month it extends to the scrobiculus cordis. Some authors have alleged that the changes in the cervix and in the situation of the fundus are so uni¬ formly regular in every case, that by attending to them it is possible to ascertain the exact period of impregna¬ tion. But in this respect they are much mistaken •, the changes being not only different in different women, but also in the same woman in different pregnancies. The texture of the parietes of the uterus seems much s I F E R Y. 22 23 24 25 Chap. If. altered after itnpregnation. It becomes spongy and Effects of fibrous. The fibres run in very different directions, and Improgn*. from their power and appearance are certainly muscu- , . lar. The blood-vessels become much enlarged, but are still in a tortuous direction. They arc paiticularly large at one part of the uterus. The lymphatic vessels, which in the unimpregnated uterus cannot be demonstrated by anatomists, become, as well as the blood-vessels, remarkably large. The ovum is not often expelled entire till after the eighth or twelfth week after conception. It is shaped somewhat like an egg, and is about the latter period about four inches iu length. When cut into, it is found to consist of four layers or membranes, and to contain a foetus surrounded by a certain quantity ot water, and connected to one part of the parietes (which is considerably thicker than the rest) by a vascular -cord. f The external membrane covers the whole ovum. It is thick, spongy, and very vascular, the vessels evident¬ ly deriving their blood from the uterus ; it has three perforations which correspond with the openings of the os tin cm and fallopian tubes. It has been called decidua, tunica filamcntosa, &c. hut its most ordinary appella¬ tion is spongy chorion* The second membrane proceeds from the edges 01 4that part into which the vascular rope which connects the foetus i* attached. It was first pointed out to ana¬ tomists by Dr William Hunter, and called by him decidua refiexa. The nante unfortunately records to posterity the absurd idea respecting its origin which -was entertained by Dr Hunter. It is not so thick and spongy as the former membrane, nor so vascular. It lies loosely between the external membrane and that to be next described ; but it appears only for a short time, as it soon becomes blended with the others. The third membrane is thin and transparent, but ■strong. It is lined with the fourth membrane, and lies in the same situation with it. It contains no vessels at this period of impregnation conveying red blood in the human subject, but in the cow the vessels are very di¬ stinct at every period. This membrane however 111 the early period of impregnation is very vascular, and its vessels are derived from the foetus. The history ot a case of morbid impregnation, where the foetus was ex- tra-Uterine, detailed by Dr Clarke in the r:!ns~ actions of a Society for the Improvement of Medical and Chirurgical Knowledge,” proves this circumstance very clearly. He says, p. 220. “ a laceration was found to be in the fallopian tube about an inch and a hall m length, each extremity of which was about an equal distance from the respective termination of the tube in the fimbriae and in the uterus. The distension ot the tube at this part was nearly of the size of a large walnut, forming a kind of pouch. More ol t.ie coagu¬ lated blood being removed from the lacerated pait, t ie sheurp-y vessels of the chorion' immediately appeared, in¬ terspersed with small coagula, and lying in contact with the internal surface of 4he pouch formed by the fallo¬ pian tube} these being separated, and the chorion di¬ vided, the amnios shewed itself, containing a foetus per¬ fectly formed of above six or seven weeks growth,” &c. This membrane is called the true chorion. The fourth membrane is even thinner and more trans¬ parent 26 27 Jhap. II. [Effects of parent than the former. It lines the whole internal ilmpregna- surface of the ovum, and together with the chorion is t1011' , continued along the vascular cord which connects tlie v ovum and foetus. Between this membrane and the chorion, near the insertion of the vascular cord, a small white vesicle appears very distinct at this period } it was first described and delineated by Dr W. Hunter, and was called by him vesicula umbilicalis. At the full period of utero-gestation it is no longer visible, being then quite transparent. The foetus at this period is between two and three inches in le’hgth, and its external conformation is near¬ ly complete. The fluid contained in the ovum is in such quantity as to prevent the foetus from touching the parietes of the covering in which it is included. It is a clear wa¬ tery fluid, of greater specific gravity than water, and of a saltish taste. When examined chemically it is found not coagulable by heat or alcohol, and to contain a proportion of ammoniacal and sea salt. This fluid is called liquor amnii. The connection of the parts thus enumerated with the uterus cannot be explained, unless the appearance of the ovum at the full period of gestation be described. sS The ovum then consists ot thi’ee membranes *, a spongy vascular substance called placenta, to which the foe¬ tus is connected by a vascular rope, and the liquor amnii. The three membranes consist of the spongy chorion, the true chorion, and the amnios. The spongy chorion covers the whole. Its vessels are numerous, and they can be filled by throwing hot wrax into the vessels of the uterus. The true chorion and amnios are in the same situa¬ tion as in the early months, being continued along the navel-string. They are quite transparent, and contain no visible vessels of any description. The placenta is a large vascular spongy mass, of va¬ rious forms in different cases, most generally approaching to a round one, placed on the outside of the true chorion, between it and the spongy chorion. Its external surface is lobulated} its internal or that towards the foetus is smooth, except from the rising of the blood-vessels. It is not attached to the uterus at any regular place, being sometimes at the cervix or side, but most gene¬ rally about the fundus. On the one side it receives blood from the mother, and on the other from the child. Mr John Hunter was the first who clearly tra¬ ced the insertion of the blood-vessels in the uterus into the placenta. He describes it thus (d) : “ The late indefatigable Dr M‘Kenzie, about the month of May 1754, when assistant to Dr Smellie, having procured the body of a pregnant woman who had died undeliver¬ ed at the full term, had injected both the veins and ar¬ teries with particular success 5 the veins being filled with yellow, the arteries with red. u Having opened the abdomen, and exposed the ute¬ rus, he made an incision into the fore part, quite through its substance, and came to somewhat having the appearance of an irregular mass of injected matter, which afterwards proved to be the placenta. rlhis ap- 47 pearance being new, he stopped, and greatly obliged Effects of me by desiring my attendance to examine the parts, in Impregna- which there appeared something so uncommon. , t~^n' . “ I first raised, with great care, part of the uterus from the irregular mass above mentioned j in doing which, I. observed regular pieces of tvax, passing ob¬ liquely between it and the uterus, which broke off, leaving part upon this mass j and when they were at¬ tentively examined, towards the uterus, plainly appear¬ ed to be a continuation of the veins passing from it to this substance or placenta. “ I likewise perceived other vessels, about the size of a crow quill, passing in the same manner, although not so obliquely : these also broke upon separating the pla¬ centa and uterus, leaving a small portion on the surface of the placenta j and, on examination, they were dis¬ covered to be continuations of the arteries of the uterus. My next step was to trace these vessels into the sub¬ stance of what appeared placenta, which I first at¬ tempted in a vein j but that soon lost the regularity of a vessel, by terminating at once upon the surface of the placenta, in a very fine spongy substance, the interstices ■> of which were filled with the yellow injected matter. This termination being new, I repeated the same kind of examination on other veins, which always led me to the same terminations, never entering the substance of the placenta in the form of a vessel. I next examined the arteries, and, tracing them in the same manner to- ward the placenta, found that they made a twdst, or close spiral turn upon themselves, and then were lost on its surface. On a more attentive view, I perceived that they terminated in the same way as the veins ; for op¬ posite to the mouth of the artery, the spongy substance of the placenta was readily observed, and was inter-' mixed with the red injection. “ Upon cutting into the placenta, I discovered, in many places of its substance, yellow injection •, in others red, and in many others these two colours mixed. This substance pf the placenta, now filled with injection, had nothing of the vascular appearance, nor that of extra¬ vasation, but had a regularity in its form, which shew¬ ed it to be a natural cellular structure fitted for a re¬ servoir for blood. “ In some of the vessels leading from the placenta to the uterus, I perceived that the red injection of the arteries (which had been first injected) had passed into them out of the substance of the placenta, mixing itself with the yellow injection. I also observed, that the spongy chorion, called the decidua by Dr Hunter, was very vascular, its vessels coming from, and returning to, the uterus, being filled with the different coloured in¬ jections.” It appears then that the placenta has a cellular struc- ture, which receives blood from the arteries of the mo¬ ther, and that there are veins by which that blood is’ returned, so that not a drop passes into the foetus. Of this practitioners of midwifery have a very familiar proof. When the placenta is retained attached to the uterus, after the birth of the child, not a drop of blood passes from the umbilical cord, except what wras con¬ tained in the ramifications of the foetal vessels when the child M I D W I F E R Y. (d) Observations on certain parts of the Animal Oeconomy, by John Hunter, p. 127* 48 Effects of child: was separated. Yet, if a small portion of the Impregna- edge of the placenta be detached, such a quantity ot tion- blood escapes from the uterine vessels of the mother, as v sometimes proves fatal to life : a circumstance which clearly shews that the blood is still conveyed into the < cellular part of the placenta. It has been said, that the placenta on one side re¬ ceives blood from the foetus. In fact, the greatest part of the placenta seems to be made up of ramifications ot the foetal vessels. The internal iliacs of the foetus are conveyed, through the vascular rope which connects the placenta and child, into the placenta ■ they then ramify into as many minute branches as the pulmonary arteries do in the lungs of the adult ; they then terminate in various branches, which, uniting, form one large trunk that is conveyed along the vascular rope, and returns all the blood which had been distributed by the ar¬ teries. As Mr Hunter remarks, “ the arteries from the foe¬ tus pass out to a considerable length, under the name of the umbilical cord ; and when they arrive at the pla¬ centa, ramify upon its surface, sending into its substance branches which pass through it, and divide into smaller and smaller, till at last they terminate in veins : these uniting, become larger and larger, and end in one which at last terminates in the proper circulation of the foetus. This course of vessels, and the blood’s motion in them, is similar to the course of the vessels, and the * r nun- niotion of the blood, in other parts of the body*.” ter,'\oc. cit. The foetus, at the full period, weighs from between p. 135. 6 and 7, to between 10 and 11 pounds, and measures 3° from 18 to 22 inches. It is placed within the ovum in such a manner as to occupy the least possible space. This position has been beautifully described by Harvey. “ Infans in utero utplurimum reperitur, adductis ad abdomen genibus, flexis retrorsum cruribus, pedibus de- cussatis, manibusque ad caput sublatis, quarum alteram circa tempora vel auriculas, alteram ad genam detinet, ubi maculae albse, tanquam confricationis vestigia, in cute cernunturspina in orbem flectitur, caput ad ge¬ nua incurvato collo propendet. T^ali membrorum situ qualem in sommo per quietem quaerimust.” f Harvey The foetus is distinguished from the adult by a great Exercit. de many peculiarities in structure : these the limits of this Partu. do not permit us to enumerate. We shall there- 31 fore notice only one peculiarity, which distinguishes the foetus not only from the adult, but even from the na- tus, viz. the distribution of the blood through its body. It is well known, that, in the adult and in the natus, all the blood of the body, brought by the two cavae into the anterior auricle ol the heart, and from that into the corresponding ventricle, is distributed by the pulmonary artery over the whole substance of the lungs, by means of the most minute ramifications 5 from whence it is re¬ turned by the pulmonary veins into the posterior auricle, and being then sent into the posterior ventricle, is, by its action, transmitted to every part of the body, through the aorta and its ramifications. But in the foetus the blood follows another course. All the blood of the foetus is returned from the placen¬ ta by the umbilical vein, which, penetrating the abdo¬ men, passes between the lohes of the liver, and thence at right angles divides into two branches nearly, by one Chap. II, of which, called ductuS venosus, a considerable quantity Effects of of blood is carried into the vena cava j by the other the Impregna remainder ot the blood is sent to the vena portarum j i ^ and, after having circulated through the liver, it too is brought by two short venous trunks, the venae cavse he- paticEe, just above the diaphragm, into the vena cava. All the blood thus received into the vena cava, is car¬ ried to the anterior auricle *, but a part only is transmit¬ ted to the corresponding ventricle, for by a particular apparatus, a quantity is at once sent into the posterior or left auricle. Anatomists have differed in opinion concerning the apparatus by which this is accomplished. As there is a small oval hole of communication between the auricles of the foetus, called foramen ovale, having a valve placed in such a manner as to prevent any fluid from passing from the left into the right, but to admit it from the right into the left, it has been generally imagined that the blood passed through that opening. But the simultaneous action of the auricles in the natus seemed to contradict this opinion. A discovery made by Dr Wolfe of Petersburgh appears to solve the riddle. He observed, that in the calf, before birth, the vena cava, at its entry into the heart, divides into two branches, by the one of which it sends blood to the right, and by the other to the left auricle. It is pro¬ bable that a similar effect is produced in the human fetus by a different structure. Of the blood sent by the right ventricle into the pul¬ monary artery, a small quantity only is carried to the lungs j for near the point at which that artery is di¬ vided into the two branches that go into the lobes of the lungs, a large branch is sent off, which joining the aorta and pulmonary artery, carries a great proportion of the blood immediately into it. What is circulated through the lungs is conveyed by the pulmonary veins into the left auricle, &c. All the blood thus received into the aorta is distributed through the several parts of the system, and a large part of it is sent out by the internal iliacs, which, pas¬ sing out at the abdomen, constitute the umbilical arte¬ ries, and distribute the blood in the manner already mentioned over the placenta, from which it is returned by the veins.——The great difference then between the fetus and natus in the circulation of the blood, consists in the quantity distributed through the lungs. To complete the description of the ovum at the full 33 period of gestation, it only remains that we should say something on the vascular rope, which connects the pla¬ centa and fetus, and on the liquor amnii. This rope is called the funis umbilicalis. It termi¬ nates by one end at the placenta, and by the other at the centre of the abdomen of the fetus. Its length and thickness differ materially in different cases. It is longer in the human subject than in any other animal. It is found generally to be from eighteen to twenty-six inches in length, and in thickness about the size of the little finger. Externally it is formed of the chorion and amnios, together with cellular substance. Inter¬ nally it is found to be composed of three blood-vessels, and a quantity of gelatinous matter. The vessels con¬ sist of two arteries and one vein: the vein being as large as both arteries united. These go in a spiral di¬ rection, and often form knots by their coils or twistings. A very small artery and vein are likewise perceived to * g° midwifery. Chap. II. Effects of go along the cord between the two layers of chorion and Impregna- amnios, which cover it, into the vesicula umbilicalis. tion. These are called omphalo-mesenteric. ' ^ In quadrupeds, a canal, called urachus, is continued ^ from the urinary bladder, along the umbilical cord, and communicates with a membrane, which, like this canal, docs not exist in the human subject, called allantois. The urine of the young animal is collected in that mem¬ brane. Some anatomists, as Albinus, have imagined, that the urachus and allantois do exist in the human subject. They were deceived by the appearance of the vesicula umbilicalis and omphalo-mensenteric vessels. The liquor amnii is never in such proportion to the foetus in the latter, as in the early periods of pregnan¬ cy. It is less pure too at that period, being often pol¬ luted with the stools of the foetus. Except in this cir¬ cumstance, its chemical qualities are the same. We shall now offer a few observations on the changes which have been described. 34 i. The cause of the increase of growth in the uterus is very obscure. The accession of fluids will account for the phenomenon 5 but a strong objection occurs against considering that as the cause, i. e. that the ute¬ rus increases to a certain degree in size, even although the direction of fluids be to another part, as where the foetus is extra-uterine. Boehmerus has marked this very accurately in a case of extra-utei’ine conception, which he has detailed (a). The developement of its fibres seems to prove, that the increase of size depends on a certain energy of the uterus itself; perhaps this may appear a very ambiguous mode »f expression, yet we can offer no other explanation of this curious phenome¬ non. 35 2. The great bulk of the uterus during the latter months, sufficiently explains the cause of the various complaints which occur at that period. Van Doeveren has described this very accurately. He says, “ uteri gravidi incrementum, adscensus e pelvis cavo, et imma- nis expansio, innumeros excitat gravidarum morbos j primo quidem arctando abdomen, et mechanice compri- mendo viscera quae in eo continentur, hepar, lienem, ventriculum, intestina, omentum, nec minus partes iis vi- cinas, nempe, renes, ureteres, aortam, venam cavam, ar- terias et venas iliacas, nervosque e medulla spinali pro- deuntes inferiores-, accidit pectoris coarctatio,similesque effectus inde excitati in corde, pulmonibus vasisque ma- joribus j ex quibus multiplici modo circulatio, digestio, chylificatio et respiratio laeduntur, inque tota corporis oeconomia, ejusque functionibus ingentis, solent produci turbae variaquevitia topicaexcitari, inter quae, tensiones, spasmi, dolores, stupores, obturationes, obstructiones, in- flammationes, congestiones, prae caeteris memorabiles sunt $ unde nascitur magna series morborum abdominis, pectoris, ipsiusque capitis j nec non artuum inferiorum Vol. XIV. Part I. t 49 torpores, dolores, crampi, oedemata, erysipelata, varices, Effects of haemorrhagiae, ulcera, labiorum vulvae inflationes, varia- Impregua- que vitia partium genitalium, et alia multa pro diversa bon, partium compressarum aut distentarum actione, variis v nominibus insignienda (b).” 3. The origin of the membrane, which appears about 36 the third month, called by Hr Hunter membrana dc. cidua reflexa, has afforded matter of dispute among physiologists. Hr Hunter imagined, that the decidua vera consisted of two lavers, and that the ovum, enve¬ loped in chorion and amnios, got somehow between these : but this is a very unsatisfactory opinion. The more probable opinion is, that the decidua vera and de¬ cidua reflexa are distinct membranes, although both formed in the same manner. If, as we have already stated, the uterus, soon after conception, be filled with a gelatinous fluid, and if the ovum be in contact with that organ at one point only, then it is probable that the vessels of the internal surface of the uterus, by shooting into the fluid with which it is covered, will form one membrane, the decidua vera ; while the ves¬ sels on the external surface of the chorion, will shoot into the fluid with which the ovum must have been co¬ vered in its descent, and form another membrane, the decidua reflexa. In proof that both membranes are formed in this way, it may be observed, that where the foetus is extra- uterine, the uterus is lined with the decidua vera, and there is no decidua reflexa.—Boehmer is the first who demonstrated this j and not Hr Hunter, as has been al¬ leged. He says, “ Quumvero uterus magnitudine gra- vido unius circiter mensis similis videretur, eundem po~ sterius longitudinaliter, etsuperius ti’ansversaliter disse- cuimus, inque ejus cavo, intuitu baud impregnati satis magno, nihil prteter tenacem et flavescentem mucum, mollemque poroso-villosam et valvulosam quasi turges- centem membranam undique uteri parietes et tubas in- vestentem, hinc inde inflammatam et erosam, structuram autem uteri satis compactam invenimus * Boehintr 4. The formation of the placenta is a curious subject loc. cit. of inquiry. That it depends principally on the foetus, P- -!• is proved by the appearances in extra-uterine concep- 37 tions. In the case of ventral conception, published by Mr Turnbull of London, this circumstance is very clear¬ ly pointed out (c). 5. The origin of the liquor amnii has been explained '’ very differently by different physiologists. Some ima¬ gine that it is furnished by the mother j others by the child. Baron Haller adopts the former opinion. “ Ergo (he says) ab utero est, et a matre, siquidem a foetu esse non potest. Non ausim experimentum produ- cere, in quo crocus, quam mater sumserat, liquorem amnii tinxitf.” But if this were the case, How could f Ilalleri the liquor amnii exist when the foetus is extra uterine ? Yet it cannot be a secretion from the foetus itself, he-^^^" G cause 14,. Xxix. sect. 3. § 9. M I D W I F E R Y. (a) H. Philippi Boehmeri Observationum Anatomicarum variarum fasciculus notabilia circa uterum humanum continens, p. 52. (b) Primae linete de cognoscendis mulierum morbis, in usus academicos, ductae a Gualth. van Hoeveren, M. H. et Prof. p. 16. (c) Vid. A Case of Extra-Uterine Gestation of the ventral kind, by William Turnbull, A. M. F. M. S» Lond. 1791. Plate 1st. 50 tion. 39 40 Effects of cause it is in rery large preportion ulien the foetus is Impregna- scarcely visible. From what source then does it pro¬ ceed P Most probably from the coats of the amnios. 6. Since from the situation of the foetus it has no direct communication with the atmospheric air, two questions occur on the subject ; first, whether it be ne¬ cessary that the foetus should receive the vivifying some¬ what which the natus receives from the atmosphere, idly, If this be answered in the affirmative, by what means is this somewhat furnished ? 1. On looking into the works of Nature, we find that there is a class of animals placed in a similar situation with the foetus, viz. the locomotive fishes. These re¬ ceive the vivifying somewhat furnished by the atmo¬ sphere through the medium of the fluid in which they are immersed ; for their blood is always distributed by the smallest ramifications over a substance in constant contact with the water, before it return into the arte¬ rial system to serve for the purposes of nutrition. From analogy therefore it must be allowed, that the foetus does receive, through some means or other, the vivifying principle of the atmosphere. 2. ’By what means then is this furnished? Many cir¬ cumstances concur to prove that it is by means of the placenta. For, 1st, The structure of the placenta resembles much that of the lungs. It is cellular, and has the whole blood of the foetus distributed in the smallest branches over its substance. See Anatomy, Animal, Chap. 4. Supplement. 2dly, The blood returning from the placenta is sent by the nearest possible means to the left side of the heart. And, 3dly, Compression of the umbilical cord to such a degree as to interrupt the circulation through it, destroys the foetus as soon as compression of the trachea does the natus. It appears therefore that the placenta serves to the foetus the same purpose which lungs do to the natus. The celebrated Haller has objected to this probable use of the placenta in the following words. “ Non pauci etiam auctores secundis pulmonis officium trihue- runt, cum in vena umbilicali sanguis ruber sit et flori- dus, si cum sanguinis sodalis arterise comparetur. Idex- perimentum mea non confirmant. In pullo arteria fere coccinea, vena violacea est. In foetu humano nunquam floridum sanguinem vidi 5 neque intelligo ut placenta, in qua certissime nulla sint aerece mutabiles vesiculse * Haller, possit pulmonis munere fungi ioc. cit. lib. later observations have contradicted the assertions xxix sect 3. j|ayer on occasion. In particular, Dr Jeffray, professor of anatomy in the university of Glasgow, in an inaugural dissertation published here in the year 1786, relates an experiment made by him which is completely opposite to the opinion of Haller. “ Puero “ he says” in obstetricatoris sinu jacenti, funiculus tribus vinculis circumjectis, et simul in arefum tractis colligatus est ; quo dein juxta umbilicum inciso, in arterris umbilicalibus et venis, inter duo vincula pla- centum proxime, sanguinis copia interceptum est. In- tercepti spatii vasa, gelatinosa funiculi parte cultro dempta, in conspectum venerunt; et arteria,quae sangui- M I D W I F E R Y. . Chap. HI. nem jam ante in parte circumlatum, acl placentum per- Natural fere bat, puncta est; quam prope arterise puncturam Parturition, vena quoque umbilicalis similiter puncta est. Quo fac- ^ to ex vena sanguis effluens, cum eo qui ex arteria ef- fluebat facile comparari poterat. Ille, venosi sanguinis instar, nigricabat; hie, sanguinis in adulta arteriis mox vivide florebat (d).” 7. The means by which the foetus is nourished haw hitherto escaped the investigation of physiologists. That the stomach and intestines do not serve this pur¬ pose is obvious from many concurrent testimonies ; but particularly from these organs being on some occasions entirely wanting, while other parts of the system of the foetus were complete. It is probable that the placenta supplies nourishment, as well as the vivifying principle, of the air to the foetus iii utero. 4* 42 43 Chap. III. Natural Parturition. 44 Human parturition, where every thing is natural, is perhaps one of the most beautiful and interesting opera¬ tions in nature ; for what can be more beautiful than a process accomplished by the combined action of a num¬ ber of powers admirably well adapted to the intended purpose ; and what can be more interesting than the con¬ tinuation of our species which depends on the operation ? In treating of this subject, we shall first consider the term of gestation ; 2dly, the phenomena of natural par¬ turition ; and, 3dly, the causes of those phenomena. Sect. I. Term of Gestation. 4- The ancients imagined that although nine kalendar months be the most usual pei'iod of human pregnancy, yet on some occasions that period may be, and actually is, pro¬ tracted even beyond ten calendar months. Accordingly, it was laid down as a maxim in ancient jurisprudence, that children born within eleven months after the death of their supposed father should be declared legitimate. In modern times the question has been often agitated, both among medical practitioners and among lawyers. Practitioners of midwifery however have had most fre¬ quent occasion to investigate this subject, and they have differed materially in their conclusions. Koederer says, “ Hunc terminum, finem nempe tri- ^ gesimae nonse et nonnunquum quadragesimae hebdoma- dis partui mature natura, uti accuratior observatio do- cet constituit, ultraque eum non facile differtur. Ni¬ hil hie valet energia seminis deficiens, morbosa vel debilis patris constitutio, matris dispositio phthisica, hectica, qua foetus sufficient! alimento privatur; nihil, status matris cachecticus, fluxus menstruus tempore gestationis contingens, diarrhoea aliusve morbus ; nihil nimia uteri amplitudo; nihil aflectus matris vehemen- tior, qualis tristitia ; nihil dioeta matris extraordinaria, vel inedia ; nihil foetus debilitas et dispositio morbosa ; nihil plures foetus in utero detenti. “ Tantum enim abest ut hae causae foetus moram in utero retardent, ut potius accelerent. Viduse quidem vanis hisce speciebus, illicitam venerem defendere at- que hereclitates aucupari, quin in eo medicos nimis cre- dulos, (d) Tentamen medicum iuaugurale, quaedam de placenta proponens, auctore Jacobo Jeffray, &c. F,dinburgh 1786, p. 41* Natural Parturition. 47 * Outlines of. Mid- nifery, p. 192. 48 Chap. m. . M I D W dulos, vel lucri cupidos in suas partes trahere student, sed mera haec sunt ludibria, prtetereaque nihil (e).” But many eminent teachers of midwifery believe that in some cases human pregnancy is protracted for two or three weeks beyond the more common period. Dr Hamilton especially says, “ In the human spe¬ cies nine kalendar months seem necessary for the per¬ fection of the foetus ; that is, nearly thirty-nine weeks, or two hundred and seventy-three days from concep¬ tion. The term does not, however, appear to be so arbitrarily established, but that nature may transgress her usual laws j and as many circumstances frequently concur to anticipate delivery, it certainly may in some instances be protracted. Individuals in the same class of quadrupeds, it is well known, vary in their periods of pregnancy. May we not, therefore, from analogy reasonably infer, that ■women sometimes exceed the more ordinary period ? In several tolerably well attest¬ ed cases, the birth appears to have been protracted se¬ veral weeks beyond the common term of delivery. If the character of the woman be unexceptionable, a fa¬ vourable report may be given for the mother, though the child should not be produced till nearly ten ka¬ lendar months after the absence or sudden death of her husband Sect. II. 'Phenomena of Natural Labour. The sufferings of a woman during labour having been compared to the fatigues of a person on a journey, the phenomena of labour have been divided into three stages. The first stage consists of the opening of the mouth of the womb 5 the second, of the actual passage of the child j and the third, of the separation and expulsion of the secundines. Phenomena of the First Stage.—In most instances the hulk of the belly subsides for a day or two before labour begins; but the first evidence of the actual commencement of that process is the occurrence of pains in the belly affecting the loins, and striking down the thighs, occasioning considerable irritation of the bladder and bowels. These pains, &c. however, often take place during some hours of the night, for days, or even weeks, before true labour begins, and are then styled spurious pains. It is not easy on many occasions to distinguish true labour throes from spu¬ rious pains, unless the state of the mouth of the womb be examined, so very nearly do they resemble each other. But in general spurious pains recur at irregular Intervals, and do not increase in force according to their duration *, whereas true pains gradually recur at shorter intervals, and become more and more violent. Spurious pains are sometimes attended with an occur¬ rence which was first publicly noticed and described by the present professor of midwifery in the university of Edinburgh (f), viz. the protrusion of the urinary blad¬ der. This resembles, to a superficial observer, the bag formed by the membranes which inclose the child, and in consequence has repeatedly been burst by the fingers of the operator. Incurable incontinence of urine, inflam¬ mation of the passages, &e. have followed this accident. 49 I F E R Y. St Protrusion of the urinary bladder may be readily Natural distinguished from that of the membranes which in- Parturition, elude the infant by two circumstances. First, the bag v ' recedes completely during the interval oi the pain j and secondly, when pushed down, the finger cannot be passed round it at the fore part of the pelvis j it seems as if fixed to the pubis. True labour-pains arise from the contractions of the womb by which that organ is shortened and thickened j and, at the same time, its contents are forced through its orifice. When they become regular and forcing, they have the effect ol open¬ ing the mouth of the womb, so that a practitioner can readily ascertain the difference between them and spuri¬ ous pains. The opening of the mouth of the womb, ia most instances, is accompanied by the discharge of a slimy, bloody-like matter, termed shews j, but in many women there is no such circumstance. This process is generally gradual, the pains in¬ creasing in frequency and force j and eight, ten, or twelve hours, commonly elapse before they complete the opening of the womb. In some cases the dilatation takes place to a considerable extent before pains occurr so that a few pains accomplish this stage. But these exceptions are not so frequent as those of an opppsite description, where one or two complete days are requi¬ red to open the womb, though the pains be unremitting. In proportion as the first stage advances, the mem¬ branous bag containing the child is pushed through the mouth of the womb, and forced gradually into the vagina. During the pain it is tense, and during the in¬ terval it becomes relaxed. When this happens, the head of the infant can be distinctly felt behind it. At last, the passages being sufficiently opened, the pains having become stronger and more frequent, the mem¬ branes give way, and the water contained within them is discharged j which finishes the first stage. Shivering, vomiting, headach, thii’st, and pain in the back, take place in many instances during this stage. Phenomena of the Second (Stage.—Sometimes an inter- 50 val of ease of some minutes duration succeeds the dis¬ charge of the waters. The pains then become much more violent and forcing, and the head, by the con¬ tractions of the uterus thus becoming more powerful, is pushed through the brim of the pelvis into the va¬ gina. For this purpose the vertex is forced foremost, and the brow is turned to one sacro-iliac synchondrosis, so that the largest part of the head is applied to the widest part of the bason ; for as the head is oval, and the opening through which it is to pass is of the same form, this is absolutely necessary. After the head is in the vagina, the pains still con¬ tinuing, the vertex is turned into the arch of the pubis, and the face into the hollow of the sacrum, by which the largest part of the head is brought into the direc¬ tion of the widest part at the outlet. All the soft parts arc now protruded in the form of a tumour, a portion of the vertex is pushed through the orifice of the vagi¬ na, and every pain advances the progress of the infant, till at last the head is expelled. An interval of a mi¬ nute or two now ensues, after which another pain ta- G 2 king (e) Boedereri Elementa Artis Obstetricae. Goettingse, 1766. page 98. (f) Select Cases in Midwifery, by James Hamilton, M. D. 1795. page 16. M I D W I F E R Y. Chap. Ill Natural king piace, the face is turned to one thigh, and the Parturition shoulders of the child being placed towards pubis and ' ■ sacrum, the whole of the body is born. During this process the patient generally adds voluntary efforts to the contractions of the uterus. This stage is in many instances extremely tedious j but after the woman has had one child, it often is com¬ pleted within the time of six or eight pains. -x Phejiojnena of the Third Stage.—Whenever the in¬ fant is born, if there be no other in the womb, the pa- rietes of the abdomen become relaxed, and the womb can be perceived through them, contracted almost into the size of a child’s head. An interval of ease of some minutes duration now elapses, after which pains again recur, commonly attended with the discharge of some clots of blood) occasioning a kind of gurgling noise, and the placenta and membranes are thrown off, and the womb remains quite contracted or nearly so, with a cavity scarcely capable of containing a hen’s egg. In some cases a single pain accomplishes this, and in others several pains are required ; but, generally speak¬ ing, this stage is completed within an hour after the birth of the child. It sometimes, however, happens that the natural ef¬ forts are inadequate to the expulsion of the secundines. The causes are, want of sufficient contractile power in the uterus, irregular contraction of that organ, and in¬ durated state of the placenta itself. From the above description it is obvious that all the three stages of labour are completed by one simple power, viz. the contraction of the womb. 52 Sect. III. Causes of the Phenomena of Labour. I. The first phenomenon which requires explanation is the action of the uterus. Why does that organ gene¬ rally act at a certain period, after having remained in a quiescent state for so long a time ? This question has puzzled physiologists strangely. Some have attributed the circumstance to a stimulus communicated by the foetus: but their opinion is over¬ turned by a well-known fact, that the same phenomena occur though the foetus be dead. Others have imagin¬ ed that the uterus is excited to act in consequence of previous distension. But were this the case, women should never have the uterus of a larger bulk in one pregnancy than in another j whereas, on the contrary, it is well known that women who have twins or triplets often have the womb distended to fully double the usual size. Physiologists as well as physicians have fallen into very great errors from referring complex phenomena to a single cause. A variety of facts concur to prove, that in the present instance it is absurd to impute the action of the uterus to any single cause. To what then should we attribute it ? To a variety of circumstances. 1st, To the structure of the uterus. From the ap¬ pearance of that organ in its unimpregnated state, it would seem that nature had laid up in store a certain proportion of fibres to be developed during pregnancy. When these fibres are evolved, if the uterus be distend- Natural ed farther, the edges of the os tincse must be separated, Parturition, in consequence of which part of the uterine contents '" passing through it, the contraction of the uterus follows. A fact very familiar to practitioners of midwifery af¬ fords apparently a complete confirmation of this hypo¬ thesis, viz. that in some women labour occurs as regu¬ larly and naturally, in the seventh or eighth month of gestation, as in others it does at the end of the ninth,, the cervix uteri having become quite obliterated. 2d, It is probable, however, that in ordinary cases this store of muscular fibres is seldom entirely exhausted, from the circumstance of women having sometimes twins or triplets ) some other cause therefore must con¬ cur in exciting the action of the uterus. Ihe contents of the uterus perhaps furnish this cause. In the latter months of gestation, some parts of the foetus come in contact with the parietes of the uterus, in consequence of the decrease in proportion of the li¬ quor amnii. This is principally the case with respect to the head, which presses on the cervix, and that part of the uterus, it is probable, is more irritable than any other ; for we find that the entrance or exit of all hol¬ low muscular organs is more irritable than the other parts, as we see exemplified in the cardia of the stomach, and in the cervix of the urinary bladder. 3d, It is not improbable too, that the pressure of the neighbouring parts contributes somewhat to induce the action of the uterus ) for it is remarked by practitioners of midwifery, that women seldom arrive at the full pe¬ riod of gestation in a first pregnancy, and the parietes of the abdomen yield with difficulty at first, as is ob¬ served in cases of dropsy. Besides all farmers know well, that in every succeeding pregnancy, cows exceed their former period of gestation. II. The next phenomenon worthy of notice is the S3 manner in which the child’s head enters the pelvis. Two circumstances contribute towards this, first the connection of the head of the child with the neck $ and 2dly, The form of the brim of the pelvis. The first of these circumstances has been accurately pointed out by Dr Osborn. He says, “ after the os uteri has been first opened by the membranes and con¬ tained waters, forming a wedge-like bag, the next operation and effect of the labour-pains or contractions of the uterus (for they are convertible terms) must be on the body of the child, which being united to the basis of the cranium at the great foramen and nearer the oc¬ ciput than forehead, the greater pressure will be applied to the occiput, which being likewise smaller, and ma¬ king less resistance, will be the first part squeezed into the cavity of the pelvis (e).” The latter circumstance has been clearly explained by Professor Saxtorph. He remarks, “ causa hujus di- rectionis capitis, concurrente toto mechanismo perfect! partus, potissimum hseret in pelvi. Nam agente utero in foetum, in axi pelvis locatum, caput ejus hucusque liberum, in humore amnii fluctuans, propter molam suam majorem in introitum ipso pelvis magnam resisten- tiam patitur a prominentia? ossis sacri, quae in posteriori parte segmenti inferioris uteri ita impressa est, ut pro- montorii (e) Essays on the Practice of Midwifery, &c. by William Osborn, M. D. Chap. III. M I D W Natural montoril Instar foetus frontem glabram, rotundam, unico Parturition, puncto tantummodo illam tangentem et satis mobilem, —V— blando motu ad iatus dirigat, in spatium ei exacts re- spondens inter protuberantiam ipsam et marginem in¬ ternum acutum ilii excavatum, quam ob rem, sincipitis praevii sutura sagittalis cadit necessario in diametrurn obliquum aperture superioris pelvis (f).” It is remarkable, that neither of these celebrated au¬ thors discovered that a combination of both the circum¬ stances just enumerated, is necessary to occasion the I phenomenon. Two advantages result from this position of the head of the child •, for, ist, The largest part of the head is applied to the widest part of the superior apertm-e; and, 2dlv, The head, when the occiput is forced foremost, occupies the least possible space. HI. The phenomenon which next strikes us, is that change in the position of the head by which the face is turned into the hollow of the sacrum. Although the advantage, and even necessity, of this change in the position of the head, has been long known to practitioners; yet Dr Osborn is, perhaps, the first author who has clearly explained the efficient cause of this. His remarks are these : “ As it (viz. the head) descends obliquely through the pelvis, the pressure ol the two converging ischia will not be exactly opposite to each other on the two parietal bones; but one is¬ chium acting or pressing on the part of that bone con¬ tiguous to the occiput, and the other on the opposite side next to the face, the head being made up of dif¬ ferent bones, united by membranes, and forming va¬ rious sutures and fontanels, which permit the shape to be changed, and the volume to be lessened, it necessa¬ rily follows, that the head, thus compressed, will take a shape nearly resembling the cavity through which it passes; and, as from the convergency of the ischia, the cavity of the pelvis somewhat approaches the form of a cone, the child’s head is moulded into that shape, the shape of all others best adapted to open the soft parts, and make its way through the os externum. This un¬ equal pressure of the two ischia upon the head, will, in the first instance, direct the occiput, or apex of the cone, to turn under the arch of the pubis, where there is little or no resistance j while the pressure ol the other ischium, in its further descent, will have the same ef¬ fect on the other side, and direct or compel the face to * Dr Os- turn into the hollow of the sacrum bom, loc. This change of position is productive of three advan- -h- p. 30. tages> ist, The largest part of the head is again adapted to the widest part of the pelvis. 2dly, The smallest possible surface of the head is ap¬ plied to the surface of the bones of the pubes. And, 3dly, As Dr Osborn, in the passage quoted, very justly observes, the head is moulded into that shape which is best calculated to pass without doing harm, through the soft parts. 55 IV. The phenomena which occur when the head passes through the external parts, are easily explained. After the head has made that turn, by which the face is placed in the hollow of the sacrum, the coccyx F h and perinaeum resist its further descent in that direc- Natural tion, and by forcing the nape of the neck against the Parturition. inferior edge of the symphysis pubis, every successive ' * ’ pain contributes to make the occiput rise up towards the abdomen, bv which the chin leaves the top of the thorax, on which it had rested during the preceding, process of delivery. By this simple mechanism, the soft parts are gradu¬ ally prepared for the passage of the child, while, at the same time, the shoulders are brought into the most la- vourable position for passing through the pelvis. V. The phenomena of the third stage of labour ob- 56 viously originate from the contraction of the uterus, which both separates and expels the secundines. Some authors have imagined that nature has provided for this- purpose a particular apparatus, placed at the fundus uteri j but as the placenta, when attached to the cer¬ vix uteri, is thrown oil' as readily as when it is attach¬ ed to the fundus, it is very evident that these authors have been deceived by a seeming regularity of fibres, which is sometimes observed. Lastly, The obstacles which nature has opposed to 57 the passage of the child, occasion all the difficulties of human parturition. These obstacles are formed by the situation and shape of the pelvis, and the structure of the soft parts concerned in parturition. The pelvis is situated in such a direction, that its axis forms an obtuse angle with that ol the hod}’ y con¬ sequently, it is not placed perpendicularly, but oblique¬ ly to the horizon; and hence nothing can pass through it by the force of gravity. The shape of the pelvis, too, is such, that the head of the child cannot pass through the outlet in the same direction in which it entered the brim j and, from the structure of the soft parts concerned in parturition, they yield with considerable difficulty. By these means, the Author of our existence has guarded against the effects of the erect posture of the body, and has prevented the premature expulsion of the child and the sudden laceration of the soft parts. Sect. IV. Treatment of Natural Labour. First stage.—When this stage proceeds naturally and regularly, there is very little else to be done, after having ascertained that labour has really begun, and that the child is in the ordinary position, than taking care that the bowels be open, and palliating any un¬ pleasant symptoms, such as shivering or vomiting, &c. which may occur. But if after the pains have become so regular as, by their continuance, to disturb the ordinary functions of life, that is, most commonly, after they have been quite regular for twelve or fifteen hours} if this stage be not completed, it is necessary to interfere, and to endea¬ vour, by art, to effect the dilatation. The reason for this rule is abundantly evident. If this stage of suffer¬ ing be longer protracted, the strength of the patient must be exhausted by the long-continued exertion, and, of course, the remaining process of labour cannot be completed. Hence the child may be lost, or alarming discharges (f) Dissertatio inauguralis de Diverso Partu, 8tc. Auctore Matthia Saxtorph, Hafnise, 1771, P* ,9* 54 Natural discharges of blood may follow the birth of the in- Parturition. fant. rpjjjg very 0|JV;oug effect of the protraction, beyond certain limits, of the first stage ol labour, was iiist pub¬ licly insisted on by the present professor ol midwifery in the university of Edinburgh. The means to be adopted for completing the dilata¬ tion, when that assistance becomes necessary, are vene¬ section or opiates, or supporting the os uteri, according to circumstances. When the resistance to the opening of the. womb arises from the premature discharge ot the water, 01 from natural rigidity of the womb, copious blood-let¬ ting affords the adequate remedy. But it the patient be already reduced by previous disease, so that she can¬ not safely be bled, an opiate, in the form of glyster, ought to be administered. And when, on the recurrence of every pain, the mouth of the womb is forced down upon the external passages before the child, its edges ought to be support¬ ed, in situ, by the lingers cautiously applied to each side. 59 Second stage.—When it is found that the head has be¬ gun fairly to enter the pelvis in the natural direction, no assistance is necessary till the perineal tumour be formed 5 and then such support must be given to the protruded parts as shall both relieve the distressing feel¬ ings of the patient, and, at the same time, prevent any laceration from happening. Of course, the precise manner of supporting the perinoeum must he a aried ac¬ cording to the circumstances ot the case. Inattention to this has very frequently occasioned the most deplor¬ able accidents. . After the head is born, it must be ascertained whether there be any portion of the navel-string round the neck of the infant, and if there be, it must be slackened or dyawn over the head, otherwise the infant will be Io5t. If possible, time should be allowed for the accommo¬ dation of the shoulders, and the expulsion of the body of the infant ; and, at any rate, the utmost attention should be paid to supporting the perinceum during that part of the process. . . 1 • • Third stage.—WThen the child is born, and it is as¬ certained that there is no other infant remaining in the tvomb, the patient should be allowed to rest for a little, unless pains again come on, by which the secundmes are separated. In that case, the cord is to be firmly ptasped, and pulled gently, till the placenta be brought down to the external parts, when it is to be drawn out carefully, in such a manner as to bring oft at the same time the complete membranous bag. Should pains not recur at the distance ol an hour al¬ ter the birth of the infant, it becomes necessary, for se¬ veral reasons, to introduce the hand into the womb to separate and extract the secundines. First, If the cord were pulled by before the womb had contracted, or the after-birth had be¬ come separated, the womb must inevitably be turned inside out j an accident that has occasionally bap- ^ Secondly, If a longer period than an hour were suf¬ fered to elapse, the passages would become so much contracted, thai the force* required again to dilate 4 midwifery. ChaP- rv. them, would produce inflammation, with ail its alarm Natural Parturition. ■Go mg consequences. . ^ Thirdly, If the after-birth were allowed to remain longer than an hour, excessive flooding might take place, which would soon prove latal. Fourthly, Were the patient to escape the danger ol flooding, she would incur that of putrefaction of the placenta, which is equally, though not so rapidly, pro¬ ductive of mortal event. In thus introducing the hand to separate the placen¬ ta, the two groat cautions to be attended to, are to ap¬ ply the Augers to the substance of the placenta, not tit insinuate them between its surface and that of the ute rus, and to bring off only that portion of the pla¬ centa which can be separated from the uterus without force. When any alarming circumstance happens after the birth of the infant, requiring the extraction of the pla¬ centa, the practitioner is not to delay for an hour, indeed not for a minute, giving the requisite assist¬ ance. Chap. IV. Of the Deviations from Nature in Hu¬ man Parturition. From the view thus given of human parturition, un¬ der the most favourable circumstances, it must be ob¬ vious that many deviations from nature may occur. These deviations may proceed", first, from the pro¬ pelling powers concerned in parturition j secondly, f 10m the state of the secundines ; thirdly, from the state of the child itself j or, fourthly, from the state of the pas¬ sages through which the child is forced. I here may al¬ so be a combination of these causes. We shall consider each of these causes of deviation in the order just enu¬ merated. But as a minute investigation of the subject would far exceed the necessary limits of this work, we shall treat each of these causes as shortly as possible, and notice only the most striking circumstances. Sect. I. Of the Deviations from Natural Labour, ^ which proceed from the Propelling Powers. The propelling powers concerned in parturition con¬ sist of voluntary and involuntary muscular action. The diaphragm and abdominal muscles furnish the foimei, and the uterus the latter. An excess or diminution of the action of those powers must interrupt the ordinary progress of labour. a. The violent action of the diaphragm and abdomi- we have represented its form in otie of the plates, and now add the description and an account of the manner of applying it from the Avork already referred to. 69 The instrument “ consists of a blade and handle (between which there is a hinge, that renders it por¬ table), measuring in length Ii4 inches. Its length, before it be curved, is 124- inches. The curve be¬ gins about half an inch from the hinge. It describes, reckoning an inch from its first curvature, as nearly as can be estimated, an arc of 87 degrees of a circle, the radius of Avhich is four inches. The breadth of the blade, at the beginning of the carve, is half an inch, and is gradually increased, till within three quarters of an inch of the extremity, where it measures an inch and three-fourths. Its extremity is semicir¬ cular. Within 24- inches of the extremity there is an oval opening, measuring 24 inches in length, and I-J - at its greatest breadth. By this opening, the depth of the curve is considerably increased, without rendering the instrument inconvenient in its introduction.” “ Let us suppose that it is found necessary to use Low¬ der’s lever, when the head of the child has just begun to enter the cavity of the pelvis. The patient is to be placed in the ordinary position, on the left side, in bed. rl he oc¬ ciput of the child is to be carefully distinguished, and the curve of the instrument is to be applied, with all the necessary precautions, over it. The extremity of the blade should be within a very little of the nape of the neck. To accomplish this part of the operation I r E R Y. Chap. IV, with facility, it is necessary that the operator be Avell Pretema- acquainted ivith the shape ot the pelvis, and that he turai Pat- have accustomed himselt to apply the instrument over a , turi^0H' , round substance. “ When the instrument is applied in this manner, the operator will find, that he can exert very considerable poAver in drawing doAvn, without pressing on any other part than the occiput ot the child, ibe mother can¬ not possibly feel the instrument •, while, at the same time, the many points of the foetal cranium. On Avhich it rests, prevent any injury AvhateA er to the infant. “ If there be any pains, however slight they may be, the operator should draw down only during the pain : in the intervals, a soft ivarm cloth should be Avrapped round the handle. If there be no pains, he must draw down from time to time, imitating, as nearly as he can, the natural efforts. It is astonishing, of what use even the most trifling pains are, on such occasions. With¬ out pains, a long time is required before the head be made to advance in a perceptible degree (though, after it has advanced a little, it soon yields entirely) •, Avhile, Avith them, the progress is often rapid. “ The operator should continue to draw dotvn in the same manner, till the head be completely in the ca¬ vity of the pelvis. Should any circumstance, as danger¬ ous uterine hsemorrhagy, or convulsions, require that -the delivery be expeditiously finished, after the head is brought into this position, the forceps must be applied j for it is in the poAver of the operator, by means of them, to accomplish the extraction of the head Avithin a very short space of time, or at least, within a much shorter space than Avould be required, Avere the use of Lowder’s lever continued. “ But if there be no dangerous symptom, the opera¬ tion may be completed by the first instrument, without any assistance from the forceps. “ For this purpose, the operator should continue to dratv down, by pressing on the occiput, as already directed, until the face shall have turned into the hol¬ low of the sacrum. The direction of the instrument must then be changed. The reason of this is very ob¬ vious. After the face is in the hollow of the sacrum,, the occiput becomes engaged in the arch of the pubis, and rises under it, while, at the same time, the chin leaves the top of the breast, on which it had rested during the preceding process of labour, and describes a course equal to a full quarter of a circle, which is the consequence of the occiput describing a similar course under the arch of the pubis. W ere the practi¬ tioner then to continue to press in the same direction as he did while the head Avas passing through the brim, he would counteract this natural process, and hence would retard delivery, and injure the parts against Avhich he Avould necessarily press the child. “ The instrument must, therefore, be Avithdrawn from the occiput, and applied Avith the proper precautions over the chin, when the operator is to imitate the process of nature, by disengaging the chin from the breast, and making the occiput rise under the arch ot the pu¬ bis, while, Avith his left hand, he protects the perinseum from injury.” “ From these observations it is obvious, that the instru¬ ment introduced into practice by Dr LoAvder, affords exactly the assistance, in the first order of laborious la¬ bour, which is required; for it supplies the place of the propelling Chap 71 p. iv. M I D \V I Pr.-tpraa- propelling powers, or increases their efficacy, by acting tuml Par- on the body of the child, without injuring any part of nuition. f|ie mother. “ This property renders it of great use in certain cases of deformed pelvis, viz. where the short diameter of the brim is about three inches. In such cases, the long continued strong action of the uterus, often eventually forces the head into the pelvis ; hut the strength of the patient is in consequence so much reduced, that after it has proceeded so far, the pains are er.tii'ely suspended, and the delivery must necessarily be finished by the use of mechanical expedients ; but the child’s life is com¬ monly previously destroyed, by the compression of the brain. “ If, in such cases, it be possible to increase with safety the vis a tergo, the child would then be forced through the brim of the pelvis before the woman’s strength were exhausted, and before its life were en¬ dangered ; consequently, many children, commonly doomed to inevitable destruction, would be preserved. “ Lowder’s lever, I apprehend, possesses this power. It may be calculated, that, by its use, the efficacy of the labour throes is at least doubled. Hence the child, in cases of slight deformity of the pelvis, is forced through die opposing part within one half of the time which would be otherwise required •, and this is ac¬ complished without injury either to the mother or in¬ fant *, for the instrument presses on no part of the for¬ mer •, and it rests on such parts of the latter, that no harm can possibly be done. “ In face-cases, too, where the interference of the practitioner is necessary (which, indeed, is a rare occur¬ rence), this instrument may be employed with much advantage. The great aim should be, to draw down the occiput. “ As it appears, therefore, that Lowder’s lever is ap¬ plicable in many cas'es where the forceps are inadmissi¬ ble, and that its use is not productive of so much ha¬ zard to the mother as that of the forceps, it might per¬ haps be inferred, that the latter instrument may be banished from practice, as unnecessary and dangerous. Accordingly, many practitioners of midwifery have adopted an opinion of this kind 5 and, indeed, there are very few who do not employ one or other of these in¬ struments exclusively. “ But however desirable it may he to lessen the num¬ ber of mechanical expedients, and to simplify practice, I apprehend, that many lives would be lost if we possessed or employed no such instrument as the forceps. As they have the property of a lever, delivery can in many cases be accomplished much more expeditiously by them than by Dr Lowder’s instrument. This seems to be the sole advantage which they possess over it j and that is counterbalanced by several great disadvantages. Many authors, indeed, have alleged, that the forceps have exclusively the power of diminishing the size of the foetal cranium, by the pressure of their blades, and hence have attributed a degree of pre-eminence to them, which in fact is not their due; for as the size of the child’s head is, in natural cases, diminished as far as is necessary, by the contractions of the uterus forcing it forward through the bones of the pelvis, an increase of the. vis a tergo will of course increase that diminution, if the shape of the passage require it. While Lowder’s lever, therefore, possesses the power of compressing the Vol. XIV. Part I. « f 72 F E R it . D / cranium in common with the forceps, it has a decided Preterna- superiority over them in this, that it accomplishes that tural Par- end by similar means with nature. v luntlon- “ The great disadvantages of the forceps are, that they are inapplicable when the child’s head is situated high in the pelvis ) that their application is often difficult to the operator, and painful to the patient ; and that, as their centre of action is on the parts of the patient, they must injure her in proportion to the resistance opposed to the delivery. “ On the whole, then, in cases of the first order of laborious labours, both instruments must be occasionally had recourse to. When the head is not completely within the cavity of the pelvis, Lowder’s lever must be employed; and even when it is in that position, the same means may be used, if there be pains. But, when the labour throes are entirely suspended, or when any circumstance renders it necessary to terminate the de¬ livery with expedition, the forceps ought to be em¬ ployed in preference to every other instrument, if the head of the child be within their reach.” The forceps are supposed to have been invented by Dr Hugh Chamberlain, ivho was physician to King Charles II. ; but their form has been greatly altered since his time. The most approved form ;s that repre¬ sented in the plate. This instrument is only applicable in presentations of the head } but it was formerly, by Dr Smellie and others, recommended in face cases. In order that this instrument be applicable, it is ne¬ cessary that the head be completely^ or nearly so, in the cavity of the pelvis} but sometimes a lengthened pair is used for cases where the head is situated high. The employment of long forceps, however, being ex¬ tremely dangerous, is seldom justifiable ; and there¬ fore we shall limit our directions to the use oi the com¬ mon short forceps. There are three principal cases in which that instru¬ ment may be had recourse to, viz. I. where the face is in the hollow of the sacrum j 2. where the lace is wedged under tlie pubis j and, 3. where it is on one side of the pelvis. In whatever situation the head is, the instrument is to be applied over the ears, otherwise there could be no safe and secure hold. In the process of extracting the child with this instrument too, it is to be observed, that the convex edge of the blades is to be brought along the hollow of the sacrum. The instrument being applied so cautiously oyer the ears of the infant that no part of the woman be injured by their introduction, the locking parts are to be brought together, and secured by a ligature ; after which the operator, supporting carefully the perinreum with one hand, is to draw gently in a direction of from blade to blade during a pain, or now and then to imi¬ tate labour throes, while he at the same time favours the mechanism of labour by accommodating the child’s head to the passage so as to make it take up the least possible room. If this be done with suitable caution and gentleness, no part of the woman should be injur¬ ed, and the parts of the infant on which the instrument had rested should not even be marked. But as there can be no doubt, that in the process of using the for¬ ceps, the parts of the woman are pressed upon by the blades, if much force be exerted, or if-due attention be H not 53 Pretenia- not paid to the adaptation of the head of the infant to f tm'ithn ^1C apertures through which it is to be brought, the i. . > most dreadful effects result from the operation. Sect. IT. Of the Deviations from Natural Labour, which, 'proceed from the state of the Secundives. 74 The membranes which envelope the foetus are in some cases more tender, and in others more rigid, than in general they are found; circumstances which have a considerable effect on the process of parturition. Be¬ sides this, the placenta is on some occasions attached to the cervix or os uteri, by which not only is the order of labour interrupted, the placenta being expelled be¬ fore the child, but also is the patient’s life exposed to much danger. 75 a. Where the membranes are too tender, the liquor amnii is discharged at the beginning of labour before the os tincte be dilated, and then all the bad conse¬ quences detailed under the article b. Sect. I. necessarily ensue. b. Where the membranes are too rigid, the labour may be protracted to such a period as shall injure the mother most materially, and at last, as the whole ovum may be expelled entire, the life of the child may be endangered. After the os uteri is completely dilated, if the child included in the membranes do not advance into the ca¬ vity of the pelvis, the membranes should be ruptured. But if it do, they ought not to be broken till they press on the external parts. c. But the most alarming deviation from nature, which can proceed from the state of the secundines, is that which originates from the attachment of the pla¬ centa over the cervix or os uteri. As there can be no doubt that the uterine vessels dip into the substance of the placenta, and that they are lacerated when the pla¬ centa is separated from its attachment, it is obvious that in such a situation haemorrhagy to a most danger¬ ous extent must unavoidably ensue during the process of the labour. Mr Rigby of Norwich was the first British practi¬ tioner who publicly explained this cause of haemor¬ rhagy. In the first edition of his work j viz. that pu¬ blished in 1775, he expresses himself in the following words. “ But from the uncertainty with which (as before observed) nature fixes the placenta to the ute¬ rus, it may happen to be so situated, that when the full term of pregnancy is arrived, and labour begins, a flooding necessarily accompanies it, and without the in¬ tervention of any of the above accidental circumstances; that is, when it is fixed to that part of the womb which always dilates as labour advances, namely, the collum and os uteri, in which case it is very certain that the placenta cannot, as before described, remain secure till the expulsion of the child, but must of necesssity be se¬ parated from it, in proportion as the uterus opens, and by that means an haemorrhage must unavoidably be pro¬ duced. “ That floodings, which arise from these two different Chap. IV. causes, which I will distinguish by the names of oca- Pretema- dental and unavoidable, though they may appear exact- tural Par. ly similar in their first symptoms, should terminate very . tuntion. differently, if left to nature, assisted only by the palli- ative means before mentioned, cannot seem strange j nor can it be a doubt, that of these two kinds of floodings, only one of them, namely, that which is produced by an accidental separation of the placenta, can be relieved by the use of these palliatives ; and that the other, in which the placenta is fixed to the os uteri, and the flooding is therefore unavoidable, cannot possibly b« suppressed by any other method whatever than the time¬ ly removal of the contents of the womb •, for supposing the discharge to be for a while restrained by bleeding, medicine, cool air, &c. it will inevitably return, when nature is so far recovered as again to bring on labour: in the first case, if the haemorrhage have been checked by the use of the above means, it is not impossible but labour may come on, and the child be safely expelled by the natural pains before it returns j or if it should return, it may not increase in quantity j as in this case very probably the separated part of the placenta which occasions the discharge remains nearly the same j where¬ as in the other case, in which the dilatation of the os uteri produces the separation of the placenta, every re¬ turn of pain must be a return of the bleeding, and it must become greater and greater as the uterus opens more and more, and the placenta is in proportion de¬ tached, till it increases to a degree that exhausts the pa¬ tient, and she dies before nature has been able to expel the child. That such must inevitably be the progress and event of floodings arising from such a cause, if left to nature, is too obvious further to be insisted on. “ That this attachment of the placenta to the os uteri is much oftener a cause of floodings than authors and practitioners are aware of, I am from experience fully satisfied, and so far am I convinced of its frequent occurrence, that I am ready to believe that most, if not all of those cases which require turning the child are produced by this unfortunate original situation of No case in practice requires more decision and more 77 attention than this. It must be obvious that no inter¬ nal remedy can be of any avail in flooding from such a cause, and that the life of the patient can be saved by immediate delivery alone, whenever considerable hae¬ morrhagy takes place. But it is to be recollected that the discharge in many instances threatens for days or even weeks before it becomes serious, and that for the sake of the child, the patient should be allowed to ad¬ vance as near as her own safety will permit to the full period. These threatenings may often be removed by astringent injections, per vaginam, while at the same time every means of moderating the circulation of the blood should be suggested. But whenever the discharge becomes profuse, de¬ livery by art is to be had recourse to. The rule of Air Rigby, and of some other eminent practitioners, “ to watch from time to time the dilatability of the os uteri,” and take advantage of that state, sounds well ; but MIDWIFERY. (l) Essay on the Uterine Hcemorrhagy which precedes the delivery of the full-grown Foetus, illustrated by cases by Fd, Rigby, Lendoa J775, p. 14. A^idq also 3d edition 1784, same page. MIDWIFERY. 59 i* 79 So but if followed in practice, must either give such a shock to the woman’s constitution, as shall end in dropsy or marasmus* or must prove immediately fatal. In all those cases the os uteri may be forced, and al¬ though it be not more open than barely to admit the introduction of the linger, it may in a very few minutes, if the operator have steadiness and perseverance, be ren¬ dered capable of allowing the hand to pass. If possible, the hand should be carried forward at one side of the placenta, for if that part be torn (which it must be admitted is sometimes inevitable) the infant must be destroyed. After the feet are brought down, the child is to be extracted as expeditiously as regard to its safety will permit, and the hand is then to be again passed into the uterus for the purpose not merely of de¬ taching completely the secundines, but chiefly of se¬ curing the contraction of that organ which is the great object of the delivery. Sect. III. Of the Deviations from Natural Labour, which proceed from the state of the Child. The regular process of parturition may be inter¬ rupted, in consequence of the position and of the shape of the child. i. Position of the child. The most natural po¬ sition of the child, at the beginning of labour, is with the head placed at the brim of the pelvis, the face towards the sacro-iliac synchondrosis of one side, and the occiput towards the groin of the opposite side. But there are many deviations from this natural position. a. Although the head be applied to the brim of the pelvis, it may be forced with the sinciput towards the promontoi'y of the sacrum, and the occipit towards the symphysis pubis. In this situation the largest diameter of the head is opposed to the smallest of the pelvis, con¬ sequently the head remains firmly fixed in that position, for as the sinciput cannot advance a point beyond the promontory of the sacrum, the occiput is forced just so much below the brim at the pubis as to wedge the head firmly between the sacrum and pubis. By the long-continued pressure the soft parts become much swelled, and at last the head is found so immoveably fixed, that it can neither be made to recede, nor can it advance in the same direction. This constitutes what has been styled the caput incuneatum, or, as it is called by French practitioners, la tete enclavee. This case most commonly is the effect of mismanagement j for if a very little pressure be made on the head when it pre¬ sents at the brim of the pelvis in this unfavourable po¬ sition, the pains will readily force it into the passage in the proper direction. When the locked head has actually taken place, the practice must be varied according to the circumstances of the individual case } hence the long forceps, and sometimes even the crotchet, are required. Turning is quite inadmissible, and the three-bladed forceps so strenuously recommended by Dr Leake, in this case are totally inapplicable. b. The long diameter of the head may also be applied to the short diameter at the brim, in a different manner, viz. with the face towards the pubis, and the occiput to the base of the sacrum. The obstacles to the pro¬ gress of the head are not in this case so great as in the former (a) $ for as the occiput is round, and its sur- pxeterna- face inconsiderable, while at the same time the promon- tural Par tory of the sacrum is round, the labour throes, after , turitlon- some time, force the occiput either a little to one side, or at least past the promontory. The case, however, is tedious, painful, and even dangerous to the patient-, for as the face presents a larger surface to the pubis than the occiput, it must require longer time to pass, and as there are many inequalities on the face, the patient must suffer much pain from their pressure, and from the same circumstance must incur the hazard of having the urinary bladder or the urethra irreparably injured. In this case Professor Saxtorph remarks, “ vel occi- 83 put prime descendit, quod cum accidit, frons ab ossibus pubis sustentata elevatur, mentumque pectori infantis imprimitur, urgentibus porro doloribus, versus anum et perinaeum, adagitur acuminatum occiput, et nullo modo sub arcu ossium pubis extorqueri potest inflexile sinciput, bine partus in exitu pelvis impossibilisredditur.” That this is a mistake, the observation of other prac¬ titioners has sufficiently demonstrated; for it is well known that in such cases, after the perinaeum has been much stretched the occiput is forced through the parts, and immediately slips back towards the anus, while the nape of the neck being applied to the anterior edge of the perinaeum, moves on it as on an axis, so that the sinciput and face emerge from under the symphysis pubis, the chin leaving the top of the thorax in the same manner as if the face were situated naturally in the hollow of the sacrum. Although in this case the natural efforts most ordi¬ narily complete the process, yet in many instances the injury which threatens the urinary bladder renders the application of the forceps expedients c. Although the head may have entered the pelvis in 83 the most natural position, yet it may not make those changes in situation which are required to accommodate it to the outlet *, for the face may turn under the sym¬ physis pubis instead of into the hollow of the sacrum. When this happens the phenomena already described (&) take place. d. It sometimes happens, that instead of the smooth 84 part of the cranium being forced first into the pelvis, the face presents. In this case it may be situated in three positions, viz. with the chin to the sacrum, or pubis, or side. a a. The first case is esteemed the most dangerous both for the mother and child. For the mother, because the child in this position requires more room than the pelvis affords, consequently the seft parts in contact with the chin and smooth part of the cranium are much compressed, and hence if the delivery be not speedily accomplished, much injury to those parts will ensue. As the chin too must pass along a curved line formed by the sacrum and coccyx, the obstacles to de* livery are very great -, and even after the face has been forced so low as to press on the perinaeum, that part is in much hazard of being torn by the violent distension which it undergoes. The delivery in such cases is very rarely accomplished naturally. This species of labour is equally dangerous to the child as to the mother, not only on account of the long- continued pressure on the brain, but also from the occi¬ put being forced so strongly on the superior dorsal ver¬ tebra that the free return of the blood from the head is H 2 interrupted, 6o MIDWIFERY. Chap. IV. tuntion. Freterna- interrupted, and hence apoplexy ensues ; a circumstance tural Par- which is proved even by the appearance of children who in such cases are horn alive, for the face of such children is perfectly livid. Jacobs has’ pointed out these dangers pretty accurately. “ II est dangereux pour I’enfant, (he says), parce que la tete etant pen- chee et portant sur son cou, elle comprime les vaisseaux sanguins au point que le sang ne pouvant plus circuler, il meure d’une apoplexie pour pen que I’on tarde a I’ex- traire.” Ecole pratique des Accouchement, par le Pro- fesseur J. B. Jacobs. A Paris, 17B5. p. 366. b b. The second case, viz. where the chin is placed towards the pubis and the sinciput to the sacrum, is neither so dangerous for the mother nor child. For if by the force of the pains the face be pushed so far for¬ ward that the chin becomes engaged within the arch of the pubis, then the inferior edge of the symphysis pubis forms a fulcrum on which the inferior jaw moves, by which the sinciput and occiput pass readily and easily along the hollow of the sacrum, their surface being well adapted to that of the sacrum, and the several parts of the face pass in succession through the_-vulva. cc. The third case, viz. where the chin is to one side, is still more favourable than the second ; for the face passes readily through the oblique diameter of the pel¬ vis till stopt by the tuberosities of the ischia, when the chin turns into the arch of the pubis, and then the same phenomena which occur in the second case take place. The cause most generally assigned for face-cases is the ill directed exertion of the propelling powers. May it not also depend in many cases on the original posi¬ tion of the foetus ? When any extraordinary difficulty occurs in face-cases, Lowder’s lever is the instrument to which recourse ought to be had. The forceps, as recommended by Smellie and others, being quite insufficient to afford a safe and secure hold of the infant. e. On some rare occasions the side of the head pre¬ sents, so that one ear is in the centre of the pelvis. In such a case, the strongest contractions of the uterus cannot make the head enter the pelvis, and the woman would generally die undelivered were it not for the in¬ terference of art. Cases of this kind are remarkably rare. The hand of the operator must be carried up in such cases, and moderate pressure must be made in such a direction as shall allow the contractions of the uterus to push the smooth part of the cranium into the cavity of the pelvis. f The head of the child is not the part always ap¬ plied to the pelvis } for sometimes the head passes last. Whenever any other part than the head presents, the labour is styled by authors preternatural. All preternatural labours have been divided into two orders. A. Presentations of the inferior extremities $ and B. Presentations of the superior extremities. A. Presentations of the lower extremities compre¬ hend cases where one or both feet, one or both knees, and the breech present. g. Cases where both feet present are more frequent than those where one only presents. It has been cal- *5 86 culated that the feet present once in 105 cases of la- p,etcrna- bour. tural Par- Some authors have divided labours of this kind into tuntion. a great variety of species. There is, however, no ne- v_ J cessitv for such divisions, and they tend to mislead and embarrass practitioners. All the varieties may be re¬ duced under three beads j for the toes must be either towards the side of the pelvis, or towards the sacrum or pubes. dd. Where the toes are towards the side of the pel¬ vis, the child is generally placed in such a manner that the abdomen, breast, and face pass in succession along the sacro-iliac synchondrosis of that side. This is the most favourable situation in which the child under such circumstances can be placed j for the largest parts of its body pass through the largest aperture of the pelvis. In this case, then, the action of the uterus forcing forward the child, the feet are by degrees excluded through the external parts, the toes being situated be¬ tween the point of the coccyx and the tuberosity of the ischium j the thighs follow, then the abdomen and thorax ; but the farther progress of the child is for some time interrupted by the arms passing up along each side of the head, which add considerably to its bulk ; at last, however, the repeated contractions of the uterus force the face into the hollow of the ^acrum, and then the nape of the neck turning on the inferior edge of the symphysis pubis as on a pivot, the face is excluded, fol- loAved by the sinciput and occiput. Where the efforts of nature in this process are sole¬ ly trusted, the child, unless it be small and the pelvis be very capacious, while the soft parts are much relax¬ ed, is generally still-born ; for before the obstacles to the delivery of the head be overcome, the long-conti¬ nued compression of the funis umbilicalis, by intercept¬ ing the course of the blood, proves fatal. e e. Authors have generally considered that to be the most favourable position in which the feet can present, where the toes are towards the sacrum. Boederer for example says, “ pedum tunc digiti si ossi sacro obver- tantur, foetus abdomini jncumbens recte situs est (l.)” But two disadvantages attend this position : First, the largest part of the child’s body is forced through the smallest part of the outlet of the pelvis j and idly, The longest diameter of the head is applied to the shortest diameter of the brim of the pelvis. In such cases, there¬ fore, the patient commonly suffers much pain, and the child’s life is destroyed. ff. When the toes are turned to the pubes, it has been universally acknowledged, that the feet are in the worst possible position. Indeed not only do the disad¬ vantages stated as resulting from the last position (c e) equally take place in this one, but another cause of difficulty and danger is added, viz. that the face being applied to the pubes, the progress of the child must be impeded in no inconsiderable degree. Hence in such a case the patient may be very much injured, and the child must be almost inevitably lost. The management of footling cases was first explain¬ ed, in as far as wre know, in Dr Hamilton’s Select Cases in Midwifery, p. 89. “It (l) Boederer Eiementa Artis-Obstetricae, p. 2-I9. 2 IV. MIDWIFERY. Preterna- “ It is a curious circumstance that the best mode of iChap. 61 88 S9 tural Par- delivery in footling cases has not yet been explicitly tarition. pointed out by any author. This must appear surpri¬ sing when it is considered that such presentations fre¬ quently occur } that the life of the child depends upon the practice adopted j and that the management ol every preternatural labour must be influenced by the rules ap¬ plicable to footling cases. “ When the feet present, the infant’s situation rela¬ tively to the mother must be with its belly placed to¬ wards her back, her belly, her side, or some interme¬ diate point. The first of those positions has been generally considered as the most favourable, and the last as the reverse. But alittle reflection must convince evei y practitioner that the infant occupies the least possible space, when its belly is towards the side ol the mother, or, to speak more accurately, towards the sacro-iliac synchondrosis ; for then the largest part of its body is within the largest diameter of the pelvis at the brim, while in its progress through the pelvis, the breech is not forced through the shortest diameter at the outlet, viz. that between the tuberosities ot the Ischia. “ In every case therefore where the feet are hi ought down, the toes should in the process ot extraction be turned into such a position, that the belly, the breast, and the face, shall be made to pass in succession along the nearest sacro-iiiac synchondrosis. Alter the arms are disengaged, the face can be readily turned into the hollow of the sacrum.” _ , h. One foot may present in the same variety of direc¬ tions as both feet. Where one foot presents naturally, if the pains be regular and strong, the case is attended with less pain to the mother and less danger to the child, than where under similar circumstances both teet present. It is less painful to the mother, because the child is formed into the shape of a cone, and the apex passes first through the pelvis, by which the parts are gradually prepared, and not suddenly forced open ; and it is less dangerous for the child, because the one leg being fold¬ ed along the belly and breast, the umbilical cord is pro¬ tected from compression. From these circumstances, a very erroneous inference has been deduced by some celebrated authors, viz. that in cases where it is necessary to perform the operation styled turning, the one foot should be broughi down in preference to both. But as on such occasions the operator cannot be assisted by pains, it is obvious that he could not have a sufficient hold of the child by a single foot. With the exceptions just stated, the phenomena where one foot presents are the same with those which occur in cases where both feet are in the passage. *. Wffien the knees present, all the inconveniences of footling cases take place, with this additional danger to the child, that if the legs be crossed, one or both may be fractured before the knees be expelled. The management of knee presentations must depend on the advance which these parts may have at the time assistance is procured. If they be still at the brim of the pelvis, the feet should be hooked down. But if they be fairly within the cavity of the pelvis, or in the vagina, they must be allowed to protrude without the parts until the feet be expelled. k. Breech cases occur more frequently than footling 90 ones. It has been calculated that they happen once in Pretema- , , tural Paf- 52 cases of labour. > . turition. The breech may present in the same variety of po- ^ j sitions as the feet, viz. with the belly of the child to the back, to the belly, or to the side of the mother. Certain advantages and disadvantages attend each of those positions. When the belly is to the back of the mother, the thigh bones being straight, pass with difficulty along the curved line of the sacrum \ after that obstacle is sur¬ mounted, the largest part of the child is applied to the smallest diameter at the brim of the pelvis ; and after the body is delivered, the head is situated in such a di¬ rection that it cannot enter the brim j for the sinciput is opposite to the promontory of sacrum and the occiput to the symphysis pubis. If the belly of the child be to the belly of the mother, then the thigh bones pass very readily along, the bones of the pubes, while the spine bending, accom¬ modates itself admirably to the hollow of the sacrum, consequently at first the labour proceeds speedily and safely 5 but after the breech has passed through the ca¬ vity of the pelvis, it is applied with its largest diameter to the shortest diameter at the outlet, and after it has at last overcome the resistance occasioned by that circum¬ stance, and the body is expelled, the face, being towards the symphysis pubis, subjects the patient to all the pain, and the child to all the dangers, already enumerated ). When the belly of the child is placed towards the side of the mother in breech cases, then the same advan¬ tages attend the situation which have been enumerated under the first footling case {dd^) ,* for the largest part of the child is uniformly applied to the largest aper¬ ture of the pelvis. Besides this, the child incurs Jess hazard in this position than where the feet originally pre¬ sent ; for the legs being folded on the belly protect the funis umbilicalis from compression. Breech cases, where the pains are powerful, are to be left entirely to nature, taking care to support the pe- rinseum, till the infant be expelled ; the navel-string is then to be taken off the stretch, and the child accom¬ modated to the passage on the same principle as footling cases. When the pains prove inadequate to the expulsion of the breech, various methods have been recommended, such as hooking the fingeV in the groin, first on the one side, and then on the other 5 employing a blunt hook for the same purpose •, fixing a garter or piece of tape over one or both thighs, and applying the forceps. The first of these methods are useful where there are slight pains, and the infant is not large. The second and third methods are injurious both to the mother and child, for they add to the vis a tergo, without dimi¬ nishing the resistance. But the fourth method, that is, applying the forceps, is invariably both safe and success¬ ful j because, while it enables the practitioner to draw forward the child without any uterine action, it at the same time puts it in his power to accommodate it to the passage by turning it round in the proper direction. B. The second division of preternatural labours, in¬ cludes all cases where any other part than the head or lower extremities presents j such as the neck, the arm or shoulder, the breast, the back, the belly, or the side. It # 62 M I D W I Pretema- It is obvious, that a full-grown child cannot possibly tural Partu-be expelled through the natural passages in such posi- 1^*on- tions, and consequently, unless nature perform the ope- ' ' " ration first described by Dr Denman, both mother and child must be destroyed 5 for the unavailing contrac¬ tions of the uterus will first operate in impeding the circulation of the child j and then by pushing forward its body with great 'forte on the soft parts ot the mo¬ ther, will induce such a degree of pain and inflamma¬ tion, that she must at last sink exhausted. 93 The practice of turning, as it is called, that is, of bringing down the feet in cases belonging to this divi¬ sion of preternatural labours, originally suggested by Pierre Franco, but first properly established by Am¬ brose Parre, has been the means of saving many valu¬ able lives. Indeed the superiority of this practice to that of making the present under such circumstances must be very obvious j for after the operator has got hold of the infant’s feet, he cart complete the delivery without requiring the assistance of pains. The dangers to be dreaded in performing the opera¬ tion of turning are rupture of the uterus, or subsequent inflammation of the passages, and loss rtf the child. The first of these, is to bfe guarded against, by pur¬ suing such means as shall suspend the labour-pains, and remove the uterine stricture, when the opportunity of turning before the discharge of the water which sur¬ rounds the infant has been lost. These are blood-let¬ ting and opiates in large doses, singly or combined, ac¬ cording to circumstances. Great gentleness and caution, on the part of the ope¬ rator, are indispensably requisite to prevent both rup¬ ture of the uterus and the subsequent inflammation of the passages. When it is added, that a perseverance for several hours is sometimes necessary for accomplish¬ ing this operation, it must be obvious, that it demands in many instances a greater degree of patience, as well as dexterity, on the part of the operator, than most cases of surgery. The safety of the infant can only be secured, by at¬ tending very accurately to the rules for the manage¬ ment of footling cases. y4 Dr Denman, whose discovery of the spontaneous evo¬ lution has been already mentioned, at one time suppos¬ ed that in the cases under consideration, the operation of turning might be dispensed with, and that the pa¬ tient might be saved much hazard, and the practitioner great anxiety and trouble, by waiting for that change. But although in the later editions of his valuable work (Introduction to Midwifery), he has relinquished this idea, his observations on the management of pre¬ ternatural labour of the second order, are evidently in¬ fluenced by his former opinion. He says (vol. ii. p. 249.), “ Yet the knowledge of this fact, however unquestionably proved, does not free us from the necessity and propriety of turning children presenting with the superior extremities, in every case in which that operation can be performed with safety to the mother, or give us a better chance of saving the child. Under such circumstances, the instructions given by former writers, and the observations we have before made, must still be considered as proper to guide our conduct. But when we are called to a patient with a preternatural labour, in which there is no room to hope for the preservation of the child, or in which we 3 F E R Y. Chap. IV. are assured of its death, or when the operation of turn- Pretema- ing cannot be performed without violence and some tin a) Par. danger to the mother, then the knowledge of this pio- tuntion,^ babihty of a spontaneous evolution, will set our minds at ease, and disengage us from the consideration of ma¬ king any hasty attempts to perform a hazardous ope¬ ration, from which no possible good can be derived, except that of extracting a dead child, and which at all events might be efiecled by a method much more safe to the mother. “ The time required for the spontaneous evolution of the child, and the facility with which it may be made, will depend upon a variety ot circumstances, but chief¬ ly upon the size of the child, the aptitude of its posi¬ tion, the dimensions of the pelvis, and the power ex¬ erted by the uterus. If the child be very large or much below the common size, the slower I believe will be the evolution, nor can it be made at all without a strong action of the uterus. It is possible, therefore, when we have conducted ourselves on the ground of expectation that the evolution would be made, that the pains may fall off or be unequal to the eftect, and we may be disappointed. It might then be apprehended, that the difficulty of extracting the child would be in¬ finitely increased. But though the evolution was not perfected, I have not found this consequence j for the child, though not expelled, has been brought into such a state that I could afterwards pass my hand with ease, and bring down its feet, though in an attempt to do this at the beginning of the labour I had been foiled. In one case in which the evolution did net take place, I could not bring down the inferior extremities, but I had no difficulty in fixing an instrument upon the cur¬ ved part of the body of the child, or in bringing it away with entire safety to the mother. It was before presumed that the child was dead, and the sole object was to free the mother from her danger r, and with her safety no appearances of the child* however disagree¬ able, are to be put in competition. In cases oi this kind another mode of practice has been recommend¬ ed, that of separating the head from the body with a blunt hook or other convenient safe instrument j but as I have never practised the method, I give the descrip¬ tion of it in a note.” There are two points in the above observations, in 95 which it appears that Dr Denman has erred. In tire first place, in sanctioning delay in having recourse to the operation of turning where the superior extremity presents. In many such cases, if the pains be not speedily suspended, or the position of the child altered, the uterus would burst •, an accident which has repeat¬ edly fallen under the observation of the writer of this article. The second error is, the supposition that, after it has been found by experience in any given case, that the spontaneous evolution is not to happen, it is easy to ex¬ tract the child either by the feet or by some instru¬ ment. But it will be found in the majority of such cases, that the infant is impacted into so close a body, while the parts are all in a state of swelling and in¬ flammation, that immense difficulty and great danger attend the attempt. The following observations on this subject cannot be too strongly impressed on the minds of, especially young* practitioners. t( Several Chap. IV. 9$ M I D W I Preterna- “ Several years ago it was discovered by Dr Den- tural Partu-man, that in presentations, such as that in the above case, the position of the child is sometimes altered, and J its expulsion accomplished, by the natural contractions of the uterus. Although the doctor, with his usual candour, has allowed, that this favourable event, under such alarming circumstances, is rather to be wished than expected j yet he has oft’ered it as his opinion, that if all interference of art were avoided, “ the woman would not, in this case, die undelivered.” “ The preceding history, however, affords a melan¬ choly contradiction to this opinion. The midwife, who attended from the beginning, did nothing to interrupt the natural process, as far as could be learned. Her fatal error was having only looked on, and having nei¬ ther given that assistance which was necessary, nor sent for others who could do so. “ The spontaneous evolution, as Dr Denman has call¬ ed it, can only take place where the child lies in a par¬ ticular situation, viz. where the action of the uterus cannot be exerted on the presenting part, or where that part is so shaped that it cannot be wedged within the pelvis. A practitioner may, therefore, by a careful examination, be able to decide whether the evolution will happen or not. This observation is by no means a matter of speculation, being, on the contrary, of much practical utility ; for, if there be signs which indicate the event alluded to, it follows, as a consequence, not only that the natural process is not to be counteracted, but also, that it is to he assisted. Two cases occurred during one year, where the author of these remarks had an opportunity of prognosticating and assisting the evo¬ lution, in presence of two gentlemen then attending the professor of midwifery, as annual pupils. “ That the uterus should continue rigidly contracted on the body of the child, while the strength of the wo¬ man was so much exhausted that no pulse could be felt, and that ?he appeared sinking very fast, is a singular and an instructive fact. It will, it is to be hoped, teach practitioners the fallacy of the assertion, that the longer the operation of turning is delayed, the more easily it will be accomplished. “ It may seem astonishing, that the body of the child could not be drawn down with the crotchet, since it was in a state of great putridity : But when it is con¬ sidered, that the long-continued action of the uterus had wedged it very strongly within the pelvis, while, at the same time, the pressure on the soft parts lining that ca¬ vity had swelled them much, the circumstance will be readily understood (n).” Authors have endeavoured to ascertain the causes of preternatural labours \ but little sactisfaction has been derived from their researches. It is probable, that some cases depend on different causes from others. For example, in some women preternatural labour occurs more than once. Such cases seem to depend on some peculiarity in the uterus or ovum. Again, it is well known to practitioners of midwifery, that, on some oc¬ casions, where the child had been found to present na¬ turally at the commencement of labour, the position is 97 F E R Y. 63 perceived to be preternatural after the first stage is com- pretcrna- pleted (o). In these cases the change of position may turalPartu- perhaps be justly attributed to irregularity of action of rkion. the uterus. Besides, there can he little doubt that some v cases of preternatural labours originate from the prema¬ ture rupture of the membranes. 2. The bulk of the foetus also occasions considerable 98 deviations from nature in labour j for it may be either too small or too large. /. The fcetus, at the full period of gestation, is never of so small size as to occasion any deviation from na¬ ture, unless it have been for some time dead. It is in¬ deed, a very remarkable fact, that women often carry to the full time a foetus which had died about the fifth or sixth month. In such cases, the child is sometimes expelled so ra¬ pidly, the passages opposing little or no resistance, that the uterus is suddenly emptied of its contents j and hence, from the irregularity of its contraction, the placenta is retained, or uterine hcemorrhagy takes place. m. The patient, however, is exposed to more dangers p0 from the increased than the diminished bulk of the fcetus. The foetus may exceed the ordinary size, either from a natural increase of bulk, or from monstrosity, or from disease. k k. It has been already stated that the fcetus at the full term of gestation, generally weighs from seven to nine pounds j but on some rare occasions it is found to exceed ten or twelve pounds, or even thirteen. Al¬ though, however, the process of delivery is not so rapid where the child is so large, yet if no other circumstance occurs to impede labour, it will be eventually termi¬ nated with safety both to mother and child in most cases. Where indeed, under such circumstances, the patient has not formerly had a child, there is always reason to apprehend that the infant may be destroyed by apo¬ plexy, or the mother may be very much bruised. In some cases of this kind, it becomes necessary to open the head of the infant. II. When the child is monstrous, from the redundan¬ cy of some large parts, as from two heads or two bo¬ dies, it is sufficiently obvious that if the mother be at the full term of gestation, the obstacles to delivery will be insurmountable by the natural powers. Fortunately, however, in by far the greatest number of cases of mon¬ sters of that kind, the action of the uterus is excited before the ordinary period. m m. The most frequent disease of children, which proves an obstacle to labour, is the enlargement of the head from hydrocephalus. On some occasions the head is enlarged to an extraordinary size. Sometimes too, the thorax or abdomen is distended ico and enlarged by a watery fluid. Professor Saxtorph has recorded the following example of an obstacle to delivery from a very uncommon disease. “ D. 18. Sept. 1775. in domo obstetricia regia, mox paritura admitte- batur gravida. Instante partus principio dolores partus veri debito modo alternantes, sed solita proportione ve- hementia, duratione et celeriori recursu infligebant. Rite tendebatur (n) Select Cases in Midwifery, p. no. (o) Vide Denman’s Introduction, vol. ii. p. 254. 64 Preterna¬ tural Par¬ turition. ioi M I D W 1 tendebatur orlftclum posteriora versus inclinans *, justa, erant capitis situs, directio et aquarum formatio } pelvis partesque molliores, viam partus constituentes, nullo la- borabant vitio •, quibus omnibus accessit adhuc sanus et robustus corporis feminei babitus, et partus aliquoties antea perpessi felix eventus, qute indubie ominabantur incceptum hocce negotium partus feliciter quoque fimen- dum fore. In progressive rite procedebat partus. . “ In fine vero capite sponte nato, truncus solita facili¬ tate sequi nolebat, quare obstetrix in arte adhuc novitia constitutam domns obstetricem expertem satis sociam sibi advocabat. . . “ Corpore foetus ad latus revoluto, ut bunien in ma- jore diametro aperturre pelvis inferiori minorem fa- cerent resistentiam, brachiisque eductis, junctis vin- bus truncum ad axin pelvis extrahere moliebanturj attamen obstabat abdomen nulla illarum vi ulterius cedens. “ In auxilium tunc accedens, qui domum isto tem¬ pore artem addiscendi gratia habitabat studiosus, manum sub abdomine prudenter intulit, quod tensum atquc complanatum sine omni obstaculo inyeniebat j ulterius vero manum protrndens pedes tetigit, interque crura tumorem ingentem tensum fluidoque contento plenum reperiebat. “ Compressa hocce tumore, dum adstantes omni vi truncum simul attrahebant, disrumpebatur subito, in- signisque aquse copia effluxit j superato sic obstacu¬ lo, facillime extrahebatur foetus, vitam per biduum trahens. “ Foetus postea examinatus fsemellus erat, ingentem saccum inter femora gerens, qui ex elongatione integu- mentorum universalium corporis a tergo versus anteriora ita protractorum, ut orificium am ex facie antenone corporis prope 'vulvam eonspiceretur, ortum habebat. In ipso sacco post effluxionem humoris, aquse fere lib. iv. capiente, nihil prater hydatides- parvas observatu dignum erat. Os sacro veto, ad angulum rectum ver¬ sus posteriora -curvatum caudse instar prommebat Sect. III. Of the Deviations from Natural Labour, which depend on the State of the Passages through which the Child is forced. The deviations from natural labour occasioned by the state of the passages, originate either from the soft parts, or the bones. . The obstacles from the soft parts are tumours within the womb, thickening and induration of the neck and mouth of the womb, enlargement of the ovary, cicatrix in the vagina, collection of fseces within the rectum, swelling of the parts lining the pelvis, malformation and extreme rigidity of the external parts. It is a curious fact, not only that conception ^some¬ times takes place when there is a tumour within the womb, but also that pregnancy goes on to the full pe¬ riod. When this has happened, the tumour has been pushed down before the infant, and has filled up the passages. • i r If this obstacle be ascertained at an early period oi the labour, which it must be if the practitioner be in F E R Y. Chap. IV. any ordinary degree skiltul and attentive, the tumour Preterna. may be pushed back, and the feet of the child may be tural Par. brought down. In a case of this kind, where the wri-, tumiony ter of this article was called in after the tumour had 'v ' become wedged within the pelvis, and the head had been opened, the delivery was accomplished with ex¬ treme difficulty, and the poor woman survived only a few hours. The following singular case of an excrescence on the os uteri, is stated by Dr Denman, vol. ii. p. 65. “ In June 1770, "! was desired to see a patient in the I0* eighth month of her pregnancy, who in the preceding night had a profuse hemorrhage. Her countenance shelved the effects of the great loss of blood she had sustained j and from the representation of the case given me by the gentleman who was first called in, I con¬ cluded that the placenta was fixed over the os uteri. On examination I felt a very large fleshy tumour at the extremity of the vagina, representing and nearly equalling in size the placenta, which I judged it to be. Had this been the case, there could not be a doubt of the propi’iety and necessity of delivering the patient speedily 5 and with that intention I passed my finger round the tumour, to discover the state of the os uteri. But this I could not find, and on a more accurate exa¬ mination, I was convinced that this tumour was an ex¬ crescence growing from the os uteri, with a very ex¬ tended and broad basis. I then concluded that the patient was not with child, notwithstanding the disten¬ tion of the abdomen, but that she laboured under some disease which resembled pregnancy, and that the he¬ morrhage was the consequence of the disease. A mo¬ tion which was very evidently perceived when I ap¬ plied my hand to the abdomen, did not prevail with me to alter this opinion. “ It was of all others a case in which a consultation was desirable, both to decide upon the disease, and the measures which it might be necessary to pursue ; and several gentlemen of eminence were called in. That she was actually pregnant, was afterwards proved to the satisfaction of every one j and it was then conclud¬ ed, that such means should be used as might prevent or lessen the hemorrhage, and that we should wait and see what efforts might be naturally made for accomplishing the delivery. “ No very urgent symptom occurred till the latter -end of July, when the hemorrhage returned in a very „ alarming way, and it was thought necessary that the patient should be delivered. There was not a possibili¬ ty of extirpating the tumour, and yet it was of such a size, as to prevent the child from being born in any other way than by lessening the head. This was per¬ formed •, but after many attempts to extract the child, the patient was so exhausted, that it became necessary to leave her to her repose, and very soon after our leav¬ ing her, she expired. ' “ We were permitted to examine the body. There was no appearance of disease in any of the abdominal viscera, or on the external surface of the uterus, which was of its regular form; and when a large oval piece was taken out of the anterior part, the child, which had (l) Vide Societatis medicse Haumensis Collectanea, vol. ii. p. 23. Chap. IV. . MID W I F E R Y. 6 Preterna- had no marks of putrefaction, was found in a natural po- tmal Par- sition. An incision was made on each side of the cer- turition- < v|x t0 t]ie vagina, and tl)en a large cauliflower excres- ~v cence was found growing to the whole anterior part of the os uteri. The placenta adhered with its whole sur¬ face ; so that the blood which she had lost must have been wholly discharged from the tumour (m).” 103 In two cases, where a great thickening and indura¬ tion of the neck and mouth of the womb, approaching to the nature of schirrosity, had takeu place previous to conception, the natural action of the uterus, though al¬ ter a very considerable time indeed, assisted by copious blood-letting, eventually overcame the resistance. One of the patients died ten months after, with all the symp¬ toms of real cancer uteri. The other was restored to perfect health after lying-in. ,04 Dr Denman has recorded (vol. ii. p. 73.) two cases, where the enlarged ovarium impeded the progress ol the child. In the one case the head of the infant was opened, and the delivery completed by the crotchet; but the patient died at the distance of three weeks. In the other, a trocar was passed into the tumour, and a living child was born. The patient recovered from her lying-in ; but died hectic at the end of six months. In such cases, the ovary may be pushed hack, if the cir¬ cumstance be discovered early enough. rc^ Cicatrix of the vagina, in consequence of former in¬ jury, may appear at first to impede the progress of the infant ; hut it will always be found to yield to the pains, if the strength of the patient be supported, and proper means be adopted to counteract the effects of the long continued labour throes. A case occurred some time ago to Dr Hamilton, where a substance, of the hardness of gristle, as thick as an ordinary sized finger placed between the vagina and rectum, and apparently extending from the ramus of one ischium to that of the other, presented an unsurrnountable obstacle to the pas¬ sage of the child. He was called in after an unsuccess¬ ful attempt had been made to tear away the infant, and found the woman in a state of extreme danger. He was informed, that five years before that period, she had had a very severe tedious labour, followed by great inflammation and suppuration of the external parts. The indurated part was cut through without the patient making any complaint, and the child was very easily extracted } but she survived the delivery only two days. The relations would not permit the body to be opened. *26 A collection of faces within the rectum has been known to occasion such resistance to the passage of the child, that the woman has died undelivered. In ge¬ neral, however, it is in the power of an active practi¬ tioner to empty the gut at the beginning of labour. But if, from neglect, the head of the child be jammed in the pelvis, and immoveably Avedged in consequence of an accumulation of faces, it then becomes necessary to open the head. Perhaps the most frequent affection of the soft parts which impedes the process of the infant is, swelling ot the parts lining the pelvis. This circumstance has been Vol. XIV. Part I. t already hinted at. It can never happen where the prac- p.Tterna- titioner is ordinarily attentive ; for the tenderness, heat, tural Par- and dryness of the passages, which precede the actual turit:on. swelling, cannot be overlooked by one at all aware of ~ v"""* the possibility of such an event. When it has actually happened, nothing can save the mother but opening the head of the infant. After this most unpleasant opera¬ tion is completed, the extraction of the child is seldom a matter of much difficulty. Malformation of the external parts in some cases does 10S not prevent conception. Two cases have fallen within the knowledge of the writer of this article, rvhere the woman had conceived though the orifice of the vagina had not been capable of permitting the introduction of even the little finger. And it consists with his know¬ ledge, that about thirty years ago a woman under simi¬ lar circumstances, was brought into the Royal Infirmary of this place, and was delivered by the Caesarean opera¬ tion. She died within two days. It is sufficiently obvious that the safe practice under such circumstances is to enlarge the natural opening, by making an incision in the direction of the perinaeum, taking care not to wound the sphincter ani. Extreme rigidity of the external parts is one of the IOp most frequent causes of deviation which depends on the state of the soft parts. It takes place, in a greater or less degree, in the greatest number of women who lie in for the first time 5 and generally in all women who are con¬ siderably advanced in life before they have children. It is seldom that the resistance opposed by the exter¬ na! parts is so very great as to proVe an invincible ob¬ stacle to labour. But, on many occasions, the long- continued pressure of the child on those parts produces the most disagreeable consequences, as inflammation of all these parts and of the bladder. Inflammation in those parts is always dangerous, for there seems to he a remarkable tendency to gangrene. Cases are on re¬ cord where the whole parts have sloughed oil', and where the rectum, vagina, and bladder, have formed one ca¬ nal. Perhaps death is much preferable to life under such circumstances. Copious blood-letting, and the liberal use of some unctuous application, with time and patience, in gene¬ ral overcome the rigidity of the external parts. Pla¬ cing the patient over the steams of hot water was for¬ merly recommended in such cases, but this practice is now exploded. * B. Many deviations from natural labour occur from II0 the state of the bones of the pelvis, for they may be so much altered in shape as either to increase or diminish considerably the aperture of that part. d. When the apertures of the pelvis are too large, the mother incurs much danger, and the child is not totally exempt from hazard. aa. The danger incurred by the mother arises from there being no resistance to the passage of the child, so that when the action of the uterus begins, the child may be pushed by the force of the pains through the passage before the soft parts be dilated; hence the ute¬ rus may be ruptured, or the soft parts lacerated. If, I oa (m) Were such a case again to occur, there could be doubt respecting the propriety of fixing a ligature round the neck of the tumour. 66 M 1 D W I F E li Y. Chap. IV. Pretema- on the other hand, the external parts he soft and tural Par- yielding, a considerable portion of the uterus may he ( tunuon- excluded without the parts. There is a very wonder¬ ful history of a case of this kind alluded to hy Saxtorph in the following words. “ Memorabilius adhuc exem- plum est illud a cel. Wolfg. Mullnero allatum, ubi totus uterus una cum foetu extra genitalia dilapsus, foetusque vivus extra pelvim versione extractus fuit, matre post rcductionem uteri superstite. Vide ejus Bahrnehmung von einer saint dem Rinde ausgefallenen Debahrmutter, , Numberg 1771 (l). 111 bb. The hazard which the child undergoes is that of being suddenly expelled, included within the entire qvum, so that it may be lost before proper assistance can be afforded. Another danger is, that the mem¬ branes having given way, it may he dashed with vio¬ lence upon the floor on -which the patient walks. Whenever from the great width of the hips, there is reason to suspect that the pelvis is too large, the practi¬ tioner should continue in constant attendance from the very commencement of labour, and should carefully adopt the appropriate and obvious means to prevent the hazards just enumerated, 112 But deficiency of space in the apertures-of the pel¬ vis occurs much more frequently than increase. The apertures of the pelvis may be diminished from natural small size or malformation of the bones, from exostosis, or from altered shape in consequence of mollities os-, slum. Cases where the sacrum and ilia are of an uncommon small shape are not frequent. Narrowness of the. base of the sacrum is sometimes met with ; and in a few cases it has been found that the apex of the sacrum has ap¬ proached too nearly to the anterior part of the pelvis, so as to diminish the apertures at the outlet 113 Exostoses seldom prove an obstacle to delivery, but one exception to this rule fell under the observation of the writer of this article several years ago. The exos¬ tosis extended along the whole extent of the symphysis pubis, and was fully as thick as an ordinary sized fin¬ ger. The woman had been delivered previous to his being called in, but the exhaustion which followed, (for she had been allowed to continue five days and nights in constant hard labour) occasioned her sinking a very short time after delivery. In this instance both mother and child were lost from the self-sufficiency and ignorance of the midwife. The deficiency may exist in the brim, the outlet, or the cavity singly or combined. The brim is much more frequently affected by mol¬ lities ossium than the outlet j and, as was long ago re¬ marked by Levret, it generally happens, that when the brim is narrowed from this cause, the outlet is wid¬ ened. -14 The brim may be diminished in size hy the projection of the promontory of the sacrum, or hy the flattening of the pubes, or hy the approximation of the bones where the pubes and ilia unite, or by a combination of some of these circumstances. The projection of the promontory of the sacrum, however, is by far the most common. When this happens, the projection sometimes Pretpma- renders one side of the pelvis wider than the other, and tural Par- this constitutes what authors call the distorted pelvis. t tul‘tion. ^ Sometimes, however, it leaves both sides of an equal width, and this is called the deformed pelvis. The deficiency in the brim produced by these causes is very various j most frequently slight, but sometimes so great that there is not an inch between pubes and sacrum. The outlet may he diminished by the approximation 115 of the tuberosities and rami of the ischia, or by the apex of the sacrum and coccyx projecting more than usually forward, while they are at the same time hook¬ ed up. When both the brim and outlet are diminished in 11G aperture, the cavity of the pelvis is generally affected also •, but when the deficiency of space is confined to either, the cavity is commonly more shallow than na¬ tural, hy which both the resistance and the danger are considerably lessened. Melancholy are the cases where the cavity is rendered deeper than usual. As t.ie practice in cases of extreme deficiency in the apertures of the pelvis is to be regulated hy the degree of narrowness, it is a matter of the first importance to be able to ascertain the dimensions in any given case with tolerable precision. For this purpose, instruments called pelvimetres have 117: been invented. M. Coutuoli has proposed one for in¬ ternal use, and M. Baudelocque has recommended one for external application. But however plausible in theory the use of such contrivances may appear, it is now well known that no dependence can be placed upon them in actual practice, and therefore the hand of the operator must he had recourse to for determining both the shape and the extent of the apertures of the pelvis, wherever there is any narrowness. The follow¬ ing directions for this purpose given by Dr Wallace Johnson are extremely judicious. “ On passing the finger along the vagina, if the coc- X13 cyx, or any part of the sacrum, be felt unusually forwards or near at hand j or if the symphysis, or any other part of the pubes, is found projecting rather inwards than outwards, it is evident that the pelvis is distorted. In which case, as well as in those where it is not distorted, but only very small, the principal part of the child’s head (allowing the presentation right) remains high, the vertex making only a little round tumor within the brim : so that when the os uteri is opened, and come a little forwards towards the pubes, the capacity of the pelvis may be found out by moving the end of the fin¬ ger round that part of the head which has entered the upper strait. This method is used by several practi¬ tioners m London. However, should the finger not be lojng enough to effect it properly, as sometimes is the case, there is then another method, which, being more certain, may be used, provided it be done with tender¬ ness and caution, and when the orifices are so well open¬ ed as to admit of it with safety. But previous to it, the operator must be well acquainted with the dimen¬ sions of bis own hand, viz* “ First, (i.) Dissertatio InauguralLs de Diverso Partu, &c. Auctore Matth. Saxtorph, p. 46. MIDWIFERY. “9 “ First, The fingers of a middle-sized hand (as we may suppose the operator’s to be) being gathered toge¬ ther equally into the palm, and the thumb extended and applied closely along the second or middle joint of the finger ; the distance between the end of the thumb, and outer edge of the middle joint of the little finger, is usually four inches. “ Secondly, Whilst they are in the above position, the distance from the thumb, at the root of the nail, in a straight line to the outside of the middle joint of the little finger, is full three inches and a half. “ Thirdly, the fingers being still in the same situa¬ tion, and the thumb laid obliquely along the joints next the nails of the first two fingers, and bent down upon them 5 the distance between the outside of the middle joint of the fore finger, and the outside of that of the little finger is three inches and a quarter. “ Fourthly, The hand being opened, and the tops of the four fingers being a little bent, so as to come near¬ ly in a straight line their whole breadth, across the joint next the nails, is two inches and a half. “ Fifthly, when the first three fingers are thus bent, their breadth across the same joint is twro inches. “ Sixthly, The breadth of the first two, across the nail of the first finger, is one inch and a quarter. “ And, seventhly, The fingers being gathered into a conical torm, the thumb lying obliquely upon the palm of the hand, with its point' upon the first joint of the ring finger, reckoning downwards, will measure in thickness, between its back and the fore part of the thumb, two inches and two-eighths. “ Now, as hands are extremely various, the operator ought always to know how much the size of his dif- fereth from the above dimensions ; and this being rightly understood, the application may be made as fellows: “ The patient, being in the position as for natural delivery, and the operator’s left hand being well anoint¬ ed, and the fingers and thumb gathered into a cone, it must he gently passed into the vagina, and then through the os uteri, unless in this part there is still a rigidity to forbid it 5 if so, the fingers only must be pas¬ sed, their extremities formed into the fourth dimension, and then placed edgeways in the strait j which being done, if the fore finger touch the angle of the sacrum, and the little one the symphysis of the pubes, the width is then manifestly no more than two inches and a half j a space through which a mature child can neither pass alive, nor be brought so by art, unless it happens to be preternaturally small indeed.” Three methods of practice have been adopted in cases of such narrowness of the pelvis as renders it impossible for the child to be protruded alive, viz. the operation of embryulcia or embryotomy, the Caesarean section, and the division of the symphysis pubis. I. Embryotomy. The case's requiring this most shocking operation are those where the infant cannot be extracted alive through the natural passages; while there is, nevertheless, such space that it may be torn 67 away piece-meal without injury to the mother. Of Prcteraa- course, in these cases the life of the woman can be saved tura) Par- only at the expence of her infant. ( turitlon Hut although authors and practitioners in modern times adopt in general this principle, they differ ma¬ terially in their account of the precise cases requiring the operation. Dr Osborn alleges, that, as the head of the infant at the lull time of utero-gestation cannot be diminish¬ ed to less than three inches between the parietal pro¬ tuberances by the natural contractions of the uterus forcing it against the bones of the pelvis ; wherever the aperture at the brim or outlet falls under three inches, the operator ought to proceed as soon as possible to open the head of the infant. But on so very serious an operation as that by which one life is destroyed, it becomes a practitioner to adopt no rule which can be at all liable to error ; and it is evident, that there are three very strong objections to this precept of Dr Osborn. first, It is impossible in any ease at the beginning of labour, to ascertain that the infant is at the full term of utero-gestation ; but it is well known, that a child at the age of between seven and eight months, if born alive, may he reared to maturity, and that such a child is capable of being expelled without injury, through an aperture incapable of permitting the pass¬ age 0:' a full-grown foetus. Secondly, The heads of children, even at the full time, are sometimes so small and so yielding as to ad¬ mit readily of their short diameter being diminished below three inches. Thirdly, every candid practitioner must allow, that it is quite impossible to ascertain with geometrical ac¬ curacy the precise dimensions of the pelvis ; and con¬ sequently what in any given case may appear to the operator to be less than three inches, may in fact he above these dimensions. I or these reasons, wherever the narrowness is not obviously very considerable, the prudent rule is to as¬ certain the efiect of the labour-throes, supporting the strength of the patient, and palliating distressing symp¬ toms. By adopting this rule, the practitioner will not only have the consciousness of not having destroyed life unnecessarily, where he is eventually forced to open the head, by the conviction that it is too large to pass unopened, but also the innate satisfaction of sometimes saving a life, which under less cautious management must have been sacrificed. Great care indeed is ne¬ cessary in such cases not to be deceived in the estimate of the progress of the child, for the swelling of the scalp may mislead a young practitioner. There has been a variety of opinion too, respecting the lowest dimensions of the pelvis which permit the operation of embryulcia with safety to the mother ; and it is surely unnecessary to state, that unless there be a moral probability of saving the life of the mother by this operation, it ought never to he had recourse to. Dr Kellie, of London (p), and Dr Osborn (q), have recorded some cases where this operation was performed, I 2 although tar (p) Dr Wallace Johnson. (q.) Dr Osborn’s Essays, 68 M I D W I 1’re tern a- although the narrowness was very great; and the latter tural Par- gentleman, founding on a single case, assumes the prin- tuj-ition ' cjple) that whenever there is a space equal to an inch and a half between pubes and sacrum, the operation of embryulcia is practicable. But a careful perusal ot the case alluded to (a) must satisfy any unprejudiced person that there must have been some mistake, most probably, from the swelling of the solt parts lining the pelvis having added to the apparent narrowness, and having, after the head had been opened above 36 hours, subsided. And at any rate, since experience has now fully established the fact, that the danger resulting from this operation is always in proportion to the de¬ gree of resistance, it may be concluded that the opera¬ tion of embryulcia cannot prove safe to the mother, un¬ less, first, there be an aperture equal to about two inches bv four; and, secondly, the narrowness be chiefly, if not altogether, confined either to the brim or the outlet. When both brim and outlet are deficient, and the cavity is deeper than usual, even although the several apertures be quite sufficient to allow the diminished head to be ex¬ tracted, the injury that must accrue from the violent pressure on all the parts within the pelvis would de¬ ter any prudent practitioner from hazarding such an operation. When it is determined to have recourse to the opera¬ tion of embryotomy, the instruments required are the perforator, the crotchet, and the embryotomy Itrrceps delineated in the plate. 122 The operation is to consist of two diflerent processes j first, the diminution of the head 5 and, secondly, the extraction of the mangled child. In many cases the latter should be performed immediately alter the former is accomplished ; hut whenever the resistance is very considerable, an interval should be interposed between the two. The advantages resulting from this practice were first publicly noticed by Dr Osborn, though there can be little doubt that the practice itself was the eftect of necessity. Bv waiting after the head has been open¬ ed, the woman’s strength will be restored, so that the assistance of the pains in the expulsion of the child may be obtained 3 the swelling of the soft parts will subside, by which the resistance may be greatly lessened, as well as the danger of inflammation removed, and the child’s body will become putrid, by which its extraction may be greatly facilitated. 123 In opening the head, which is to be done by means of the perforator, the two great points to be aimed at are to avoid injuring any part of the woman, and to make a sufficiently large opening of the head. On the complete accomplishment of the latter, the eventual success of the operation must depend in all cases of ex¬ treme deficiency of space. Should it be found expedient to delay the extraction of the infant after the head has been opened and its contents evacuated, the teguments are to be cai’elully brought over the ragged edges of the bones, so that in the event of labour throes recurring, there shall be no risk of the parts within the pelvis being injured. F E B Y. Chap. IV. When it has been found proper to proceed to the ex- Vmmm. traction of the infant, the first thing to be attempted is turaf Par. to diminish the bulk of the cranium as much as possible. ( turition. This may be done by means ol the embryulcia forceps, ^ ~ u delineated in the plates, and contrived it is believed by Dr Lyon of Liverpool. It is an instrument far supe¬ rior to the almisdach of the Arabians, in use even within these fifty years among the practitioners of this island (b). After the head has been sufficiently reduced in bulk, the crotchet is to be fixed at first on the inside of the cranium 3 and while two fingers ot the left hand are to be kept constantly so applied that if the instrument should slip in the process of extraction, it shall be re¬ ceived on the fingers, and cannot possibly touch any part of the mother, the operator is to draw down with a suitable exertion of force, in such a direction that the largest part of the head shall be brought through the widest part of the pelvis. In some cases, much time and very violent exertions are required to accomplish the delivery 3 but, it the proper precautions to prevent any injury to the passages be adopted, and if at the same time the operator imi¬ tate nature by working only from time to time, and in¬ crease the force employed gradually as may be required, and persevere patiently, notwithstanding the resistance, taking care to support by nourishment and cordials the strength of the woman, the delivery at last will be completed. The dangers to be dreaded from this most shocking i2j operation, are injuries of the passages, from the instru¬ ment’s slipping through the embarrassment of the prac¬ titioner 3 or violent inflammation ot all the contents of the pelvis extending to the abdomen, in consequence of the parts through which the child must be so forci¬ bly extracted being severely bruised. Accordingly, a greater number of women die from the effects of this operation than practitioners are willing to admit 3 and indeed, in every case of extreme deficiency of space, where embryotomy is performed, the recovery is to be regarded as doubtful. This operation is sometimes had recourse to in cases where the forceps should have been used had the child been alive. But such cases are very rare, because the evidence of the infant in utero being dead, is seldom so complete as to justify the practitioner proceeding on the principle that it is so. II. By the Ccesarean section is meant the extraction 1J(5 of the infant through the parietes of the abdomen by an incision into the uterus. This bold operation was perhaps never performed by the ancients on the living subject, and certainly was first recommended to practitioners by M. Rousset in his Traite nouvelle de PHysterotomie, &c. 1581. Since that time it has been often performed on the continent, and about twenty times in Great Britain. The success of this operation recorded in the early works has cer¬ tainly been exaggerated 3 but it appears by an elabo¬ rate memoir by M. Baudelocque, translated into English (a) Osborn’s Essay, p. 240. _ . (b) For an account of the ancient instruments employed in the practice of midwifery, see bculteti Arma¬ ment, Chir, IV,- M I D W I F E 11 V. On 117 ri8 np by Dr Hull of Mancliester, that (hiving the 50 years preceding 1802, the operation has been had recourse to on the continent 95 times, and that 37 of these cases proved successful. In Great Britain, on the contrary, this operation has never yet succeeded, a circumstance to be attributed partly to the delay which has always taken place after the necessity for such an expedient had been determined, and hence the patient, at the time the operation wras performed, must have been in a state of exhaustion 5 and partly, perhaps chiefly, to the pre¬ vious very alarming state ot health of the subjects of the operation in this island. It is at any rate certain that all over the continent practitioners have less horror at performing the Caesarean section than British practi¬ tioners have commonly shewn; and it is deemed necessary in cases where the operation of embryulcia is preferred in this country, and where of course the women are not in such a precarious state of health as those com¬ monly are who have extreme narrowness of the pelvis. In consequence of the fatality of the Caesarean sec¬ tion in Great Britain, several eminent practitioners have regarded it as unjustifiable. Dr Osborn has ren¬ dered himself particularly conspicuous on this subject, and uses very strong language in reprobation of it. His arguments are, its acknowledged fatality •, the capability of completing the delivery by means of the crotchet, in cases of such deformity of the pelvis, that there is no more than one and a half inch between the pubis and sacrum, or to one side of the projecting sacrum •, and the impossibility of impregnation taking place in cases of greater deficiency of space. We shall notice these arguments in their turn. 1st, The acknowledged fatality of the operation.— This relates only to the result of the operation in Great Britain ; for, as already mentioned, a great proportion of the patients has been saved on the continent. But in insisting on this argument Dr Osborn has over¬ looked that the object of the operation is to save, if possible, two lives, and at any rate one. Now ii it can be-satisfactorily proved, that on some occasions the operation of embryotomy is absolutely impracticable, it becomes the duty of the practitioner to save one life at least; and it is well known that the Caesarean opera¬ tion is far less painful to the woman than that ot em¬ bryotomy, even where that latter operation is eventually successful. In such cases of extreme deformity, either an attempt should be made to deliver the woman and save the child, or both must be allowed to perish ; for the operation of embryotomy, if attempted, must be re¬ garded as wilful murder. 2dly, The practicability of tearing away the child in pieces by means of the perforation and crotchet, in cases where there is no more than an inch and a halt be¬ tween the pubis and sacrum, or to one side of the pro¬ jecting sacrum, is alleged by the doctor on the founda¬ tion of a single case, that of Elizabeth Sherwood al¬ ready referred to. But any person who shall take the trouble to have the aperture of Sherwood’s pelvis, as stated by Dr Osborn, cut out in wood, and to compare this with the basis of an infant’s skull as much diminish¬ ed as possible by the crotchet (which is done in the turition. 130 course of his lectures by the prf-« .'ssor of midwifery in preterna - this university), must be convinced, that there was rural Par- some mistake in the supposed dimensions ot that wo- ( man’s pelvis. And it is quite obvious, that unless there be the space already stated, viz. three and a half or four inches bv two, it is unsafe to extract the mangled child through the natural passages. 3dly, The allegation that where there is a greater de¬ gree of narrowness ot the pelvis than that which was supposed to have happened in the case of Sherwood, im¬ pregnation cannot take place, is quite inconsistent with facts. One of the most remarkable cases of extreme de¬ formity is that of Elizabeth Thompson, on whom the Caesarean operation was performed at Manchester in 1802. The description as given by Dr Hull (g) is as follows : “ The pelvis of this patient was not nearly so soft as has sometimes been observed. It still had a con¬ siderable degree of bony firmness. The ossa innominata at their sacro-iliac synchondroses, and at the symphysis pubis, before the pelvis was dried, admitted of a slight degree of motion.—The distance from the crista ot one os ilium to the other, at their most remote points, mea¬ sures ten inches and a half. “ The alse of both ossa ilia are very much bent •, and on the left side the curvature is so great, that it mea¬ sures only two inches from the anterior and inferior spinous process to the opposite posterior point. The lumbar vertebrae project forwards or inwards, and make a considerable curve to the left side ot the pelvis. The distance from the lower part of the second lum¬ bar vertebra to the anterior part of the spine of the os ilium, on the left side, is two inches. 'I he distance from the lowest part of the second lumbar vertebra to the anterior part of the spine of the os ilium, on tho right side, is five inches. “ Superior aperture. The conjugate or antero-pos- terior diameter, from the symphysis pubis to the upper edge of the last lumbar vertebra is one inch and a half. —This diameter is not taken from the os sacrum, or its junction with the last lumbar vertebra, because the point of their junction is so much sunk into the pelvis, that the place it should have occupied, is represented by the junction of the fourth and fifth lumbar vertebra. The tranverse diameter measures four inches and five- eighths. It is taken from one sacro-iliac symphysis to the other. The distance of the point of this aperture, which is opposite to the anterior part of the right aceta¬ bulum, from the lumbar vertebra, is only half an inch. The distance from that part of this aperture, which corresponds with the posterior part of the right aceta¬ bulum, to the os sacrum, is three-fourths of an inch. The distance of the point, corresponding with the an¬ terior part of the left acetabulum, from the lumbar vertebra, is five-eighths of an inch. The distance of the point of this aperture, opposite to the poste¬ rior part of the left acetabulum, from the os sa¬ crum, is three-fourths of an inch. The distance of one os pubis from the other, in the points marked in the plate, is seven-eighths of an inch. The dis¬ tance from the right sacro-iliac symphysis to the sym¬ physis pubis is three inches and three-fourths. The di¬ stance 131 (g) Observations on Mr Simmons’s Detection, &c. p. ipi' 133 M I D W I stance from the right * aero-iliac symphysis to the left os pubis is three inches ami three-eighths. The distance from the left sacro iliac symphysis to the symphysis pubis is three inches and five-eighths. The distance from the left sacro-iliac symphysis to the right os pubis is three inches and one- fourth. The largest circle, that can be formed in any part of the superior aperture, does not exceed in diameter one inch. “ Inferior aperture. The distance from one ramus ossis ischii to tiie other, where they are united with the rami ossium pubis, measures only half an inch. Ihe distance from the tuberosity of one os ischium to the other measures one inch and two-tenths. The conju gate or antero-posterior diameter, taken from the sym¬ physis pubis to the point of the os coccygis is three inches. “ The angle, included by the rami of the ossa pubis, is very acute, viz. an angle of about 20 degrees. The perpendicular height from the tubera of the ossa ischia to the inferior margin of the symphysis pubis is two inches and a half. The perpendicular height of the symphysis pubis is one inch and a hall. The tuberosity of the left os ischium advances forwards, beyond that of the right, about six-tenths of an inch, and the whole of the rami ossis pubis and ischii on the left side projects beyond those ol the right. The perpendicular height of the os sacrum and coccyx is two inches and one-fourth only, the os sacrum being bent so as to form a very acute ■ angle. The acetabula, at their nearest points, are only three inches distant. I he symphysis pubis is much more prominent than natural. 'Ihe up¬ per margin of the symphysis pubis is situated as high as the bottom of the fourth lumbar vertebra.” It appears then that Dr Osborn’s arguments are fal¬ lacious, and that cases occur where the operation of embryotomy is neither safe nor practicable. Under such circumstances, the Caesarean section must be had recourse to •, and it is therefore to be regarded as an operation of necessity, not one of choice. If this rule be adopted, the cases requiring so formidable an expe¬ dient will happily be very seldom met with. Mr Simmons of Manchester, observing that Dr Osborn’s third argument is untenable, has proposed in the following words, another substitute for the Caesarean operation. “ When a case shall arise in wlfich the child cannot be delivered by the crochet, from the brim of the pel¬ vis being no more than one inch in diameter I propose to combine the two operations, and to divide the sym¬ physis pubis to make way for the crotchet. Dr Osborn has urged several objections against this proposal, al¬ though he admits that the operation at the symphysis is not so certainly fatal as the Caesarean section. Weighty objections doubtless press against it \ but while there are no other means for preserving life, bad as the chance is, it becomes a question whether it be worth risking } and, after maturely considering the case, should an attempt for saving the life of the mother be judged expedient, as the last resource it may be adopted. “ The space gained has been differently stated at from three to eight or nine lines in the diameter 5—the me¬ dium distance would probably be sufficient to accom¬ plish the delivery by the crotchet. “ The objections urged against this mode of delivery, when the head is of the full size, will not apply to its 4 F E li Y. Chap. IV. reduced bulk ; and it should be remembered, that the Preterna. symphysis is formed of cartilage and ligament } so that rural Par- whatever pressure shall be made against the ffivi- , ded edges, will not be made against the sharp angles of bone. That much injury may be done anteriorly will not be denied ; but does the continued pressure of the child’s head never produce mischief in other cases'* By the introduction of a female sound tor a guide, a cautious and steady operator will avoid wounding the urethra ; and, as the base of the skull will probably be turned sideways, it will suffer less in extraction than in other casts of the crotchet j in which it must in general be injured from pressure against the pubis. If the sepa¬ ration, however, be carried beyond a certain length, laceration will probably ensue 5 and, should this acci¬ dent occur, I see no reason to apprehend more danger from it than follows the extraction of a large stone from the bladder through a small opening, which will induce a lacerated wound, but which we know will not uncommonly heal. The sacro-iliac ligaments would certainly not be injured bv choice, but the consequences, 1 believe, are not generally fatal 5 and, should it be urged that great pain and lameness will afflict the pa¬ tient for a long time after, a reply will readily occur, that life was at stake j and surely there are tew who would not compound, for the prospect of temporary pain and inconvenience, to have it preserved to them. “ A spontaneous separation sometimes occurs, both there and at the pubis; and yet the patient has been again restored to health. “ 1 do not see, in other respects, in what this com¬ pound operation differs from the most difficult crotchet case—the Caesarean section is certainly fatal to the mo¬ ther in this country—the life of the child, it is agreed, shall not be put in competition with the parent’s life— the section of the symphysis is neither so formidable nor so fatal as the Caesarean section—and the crochet has been successfully applied in dimensions which will pro¬ bably be thus acquired. “ Upon the whole, then, in that supposed case of dis¬ tortion (which I hope will never happen) in which the mother must be doomed to death, from the impossibi¬ lity of delivering the child by the crotchet, the com¬ pound operation I have recommended will furnish a re¬ source, approved by reason and sanctioned by experience j inasmuch as the section of the symphysis pubis has been made, and the crotchet has been used, though separate¬ ly, yet with safety. Such a case will be attended, un¬ questionably, with additional hazard •, hut it oilers the only chance to the mother, to the preservation of whose life our chief care should be directed : and 1 hope that in future all trace of the Caesarean operation will be banished from professional books ; for it can never be justifiable during the parent’s life, and stands recorded only to disgrace the art.” He himself lias afforded the most sat isfactory evidence :34 of the absurdity of his own proposal } for be had not published it many months when the very case he had described as ideal actually occurred in his neigbourhood, and he had the opportunity of making the experiment of his own plan. But he shrunk from it, and no wonder 3 for the woman was Elizabeth Thompson, whose pelvis has just been described. It is unfortunate that Mr Simmons has not had the candour to confess his error, and to retract his opinions, more especially since his re¬ flections hap. IV. M I D W re tern a- flections against the Caesarean operation, were couched iral Par- in language peculiarly bitter and invective, untion. ^ yv^th respect to the mode of performing the Ccesarean section, there has been considerable variety of opinion. 1,35 On theoretical principles, the external incision, viz. that through the parietes abdominis, ought to be in the direction of the linea alba, because there is less chance of any considerable retraction of muscular fibres, or of interfering with the intestines, than if it were made in any other direction. Bat the result of the practice seems at variance with the theory. According to the testimony of Baudelocqne, of 35 operations, where the incision was made on th * side of the abdomen, eighteen proved successful ; of thirty in the direction of the linea alba, ten only succeeded ; and of eight in the manner recommended by Lauverjat, that is, by a transverse in¬ cision between the recti muscles and spina dorsi, three succeeded. But it may he remarked, that the event, in many of those cases, may have been influenced by a variety of circumstances, totally independent of the line of direction of the external incision. In whatever part of the abdomen the external inci¬ sion be made, it ought to be extended to six inches •, and, previous to cutting into the uterus, any active arterial branch, which may have been divided, must be secured -r and the liquor amnii, if not already discharged, must be drawn olf. The opening into the uterus need not be above five inches in length, and should he made as much towards the fundus as possible. Means are to be employed to prevent the protrusion of the intestines at the time the uterus is emptied. Both foetus and secun- dines are to be quickly extracted ; after which, the hand is to be passed into the uterus, to clear out any coagula which may have formed within its cavity, to prevent the os tincce being plugged up, and, at the same time, to promote the contraction of the uterus. The wound in the uterus is to be left to nature; but that of the parietes of the abdomen is to be carefully closed by means of the interrupted suture and adhesive straps ; and the whole belly is to be properly supported by a suitable bandage or waistcoat. In the after treat¬ ment of the patient, the great objects to be held in view, are to support the strength and moderate the de¬ gree of local inflammation. 136 III. Division of the symphysis pubis.—This was ori¬ ginally proposed and performed by M. Sigault of Paris. His proposal was made in 1768 ; but he had no oppor¬ tunity of making the actual experiment till September 1777.—The success of his first case was such, that a medal was struck to commemorate the event ; and the operation was admired and recommended, with all the extravagance of French enthusiasm. The operation consists of the division of the symphysis pubis and separation of the innominata. For this pur¬ pose, a catheter is to be introduced into the urethra, and, with a common scalpel, the articulation is to be cut through from the upper edge of the symphysis, to within a quarter of an inch of the inferior edge. By Separating the thighs, the divided bones are forced asunder. After this, the operator is either to turn the F E R Y. 71 child, or to extract it by the forceps, according to the Preteina- circumstances of the case. tural I’ar- This expedient was proposed as a substitute, both lor tuntIon- the operation of embryulcia, and for the Caesarean sec- v tion, as it was alleged to be perfectly consistent with the safety both of mother and child. It is quite unnecessary for us to offer any theoretical objections to this operation, because we can now reason on the event of thirty-six cases, which have been publish¬ ed.—But those who may wish to investigate this subject, may consult Baudelocque, par 1994. and 2091. inclu¬ sive j and X)r Osborn, p. 271. To that latter practition¬ er’s professional zeal and ability is chiefly to be ascrib¬ ed the total rejection of this operation in Great Britain. Of the thirty-five subjects of the published cases (for 07 in one woman it was performed twice), fourteen women and eighteen children died.— Of the twenty-one avo- men Avho survived, nine had either had living chil¬ dren before the Sigaultian operation, or had such at a subsequent period. Most of the remainder suffered much from the operation. Some had incurable incon¬ tinence of urine, others lameness, &.c. But the most important fact is, that whenever the bones of the pelvis Avere separated from each other above an inch (and no space of any consequence could be added to the brim, unless they Avere so), the sacro-iliac synchondroses Avere torn, and no A\oman survived that accident. These facts have at last convinced foreign practition¬ ers of the futility of this expedient) and, accordingly, for above ten years, it has not been performed on the continent by any practitioners of respectability. When a woman, Avith a narrow pelvis, Avho has had 138 the good fortune to recover after the operation of em¬ bryotomy, again falls with child, she should not incur the hazard of a repetition of so horrible an operation ; but ought to have premature labour induced betAveen the seventh and the eighth month. Under the direc¬ tion of an intelligent practitioner this operation is easily performed ; and, while it affords the only chance of saving the infant, which it is the duty of the mother and of the practitioner to attempt, it at the same time,. by lessening the resistance, diminishes both the suffer¬ ing and the risk of the patient (n). For a further account of the practice in cases of ex¬ treme deformity of the pelvis, the reader is referred to Osborn’s Essays; Hamilton’s Letters to Osborn ; Sim¬ mons’s Reflections, and Hull’s Detection of Simmons. Sect. IV. Of the Deviations from Natural Labour j ^ which happen from anomalous circumstances* Certain circumstances besides those already enume¬ rated occasion deviations in the process of labour. Some of these respect the child, and others the Avoman. a. The child’s life is endangered if the navel-string 14« be so strongly convoluted round its neck, that after the head is born the remainder cannot be expelled Avithout the cord being drawn so tight as to interrupt the circu¬ lation through it. Dr Denman, vol. ii. p. 16. has stated this as a cause of protracted labour, and has ad¬ vised (n) See a paper on this subject, in the 18th volume of the Medical Facts and Observations, by Mr Barlow. I4I 142 72 M I D W I Preterna- vised certain modes of practice in consequence. But turn] Par- if there be pains, there cannot be any material prctrac- turition. tion 0f the labour from this cause. ' 1 A\\ risk 0f the infant may be prevented by slacken¬ ing the cord, and waiting for the action of the uterus, if the operator find thut he cannot draw the loop of cord which surrounds the child’s neck easily over its head. But this in most cases can be readily done. b. The cord is sometimes pushed down before the presenting part of the child. If this happen before the membranes are burst, the only certain method of saving the child is to perform the* operation of turning as soon as the state of the pas¬ sages will permit. When the cord is pushed down along with some other part, as the head, after the waters are discharg¬ ed, a variety of practice is required according to the circumstances of the particular case} hence merely keeping the cord for a little time beyond the present¬ ing part by means of the fingers, or wrapping it up in a piece of soft rag, and pushing it above the presenting point, or the application wf the forceps, are severally found useful in different cases. c. Sometimes one or both arms of the child are for¬ ced down along with the head, where proper assistance is not had at the beginning of labour. If the pelvis be roomy, and the woman have formerly had children, the delivery may be at last completed by the natural powers, notwithstanding this increased degree of resist¬ ance. But in many cases of tiffs kind an experienced practitioner is not called in till the strength ot the wo¬ man be very much exhausted, and then it becomes ne¬ cessary to use the forceps, or even on some occasions to have recourse to the operation of embryulcia. d. It is well known, that sometimes there is more than one child in the womb. Instances where there are twins are not unfrequent} cases of triplets aie al¬ leged to happen once in between three or four thou¬ sand births 5 four at a birth have not occurred in this city for the last twenty-seven years} and there are on¬ ly two, or at most three, well-authenticated cases of five at a birth having happened within a hundred years in this island. All the signs by which the existence of more than one child in utero can be ascertained, previous to the actual commencement of labour, are fallacious } and in general it is not till after the birth of one child that it can be determined that ^ another remains in the womb } and, unless under very particular circumstances, it is of no importance. Ihe circumstances alluded to are where different parts of both children are foiced in¬ to the passage at the same time. Of this a veiy re¬ markable case is recorded in the book of Genesis, verse 27. chap, xxxviii. When the womb appears to remain bulky and hard after the birth of one child, there is reason to suppose that it contains a second. But if there be any doubt on the subject, the practitioner has it in his power to ascertain the point by examination. When there is no second child in the uterus, the further the fingers are carried up within the passages, the more contract¬ ed do they feel } whereas, if there be a second child, the more open are they found. When it is ascertained that another infant remains, the woman’s belly should be immediately compressed by l F E R Y. Chap. IV. *43 *45 *44 means of a roller, in order to prevent faintisbness from Pretern,.. the sudden relaxation of the parietes abdominis, and tural Par. the portion of the navel-string remaining attached, tnn^UIR-_ to the after-birth of the first born should be care- v J fully secured, let the vessels of the placenta anasto¬ mose. In regard to the subsequent treatment, there has been much variety ot opinion among practitioners. Some have proposed waiting1 tih the action of the uterus expel the second as it had done the first in¬ fant. Others urge strongly the necessity for imme¬ diate delivery. Against the former of these practices it is to be ob¬ jected } first, that in some cases, days or even weeks have been known to intervene between the birth of one child and the action of the uterus which expelled the second. Secondly, that if this happen, the passages must become contracted and their subsequent dilatation may be productive of inflammatory symptoms. Third¬ ly, that during the time the uterine action is suspend¬ ed, internal haemorrhagy may take place, and may de¬ stroy the patient. And, fourthly, the second child may be suddenly forced down in such a position, as may en¬ danger its life, and at the same time occasion great pain to the mother. For these reasons it is now an established rule among judicious practitioners, to examine the situation of the second infant, as soon as the patient shall have reco¬ vered from the shock of the birth of the first child } and, if its position be natural and the patient have not been exhausted by the previous labour, and pains come on, to rupture the membranes, and allow the natural powers to complete the delivery. But if the infant present any other part than the head, or though the head do present, if the woman be exhausted, or if there be no appearance of the return of pains within an noui after the birth of the first, then the hand is to he passed up to bring down the feet of the second child, and the delivery is to be expedited. The extraction of the pla¬ centae is to be conducted with great care, and cveiy possible precaution is to be adopted against the occur¬ rence of flooding, which is always to be dreaded as the consequence of plurality of children. The same principles apply to the management of tri¬ plets, &c. d. Umbilical hernia, to which women are perhaps more subject than to any other species ot ruptuie, may influence the labour materially. If it be reducible, it disappears after the fifth month of pregnancy •, hut immediately after the expulsion of the child it returns, and occasions frightful faintings and floodings. This may he prevented by the simple expedient of having the belly compressed by a roller 111 such a manner, that in proportion as the infant advan¬ ces, the compression may be increased. Should it be irreducible, if the hernia be aflected by the continuance of labour, as may he known by the colour, &c. the operation of turning must be had re¬ course to. e. Convulsions sometimes happen during labour, and occasion great danger botli to the mother and the child. The woman is quite insensible during the fit, which consists of violent convulsions ot the muscles which move the body, and of those of the eyes, the face, and the lower jaw } it lasts in some cases only a few teconds, and i4<» 147 M I D W ) ’)r Dm- ! nn’s An- ;t!s, vol. V, ‘ 3l9- 149 150 ,151 and in others for several minutes. After the fit has ceased, it sometimes happens that the patient remains in a comatose state ; in other cases the sensibility returns. The circumstances which distinguish this disease from epilepsy were first stated explicitly by Dr Hamilton in the following words : “ The old distinction between eclamp¬ sia and epilepsia has been rejected by Dr Cullen, without sufficient reason. The convulsions that occur during preg¬ nancy and labour, should be distinguished by the former name, for the disease is always an acute one, and it never, as far as my experience goes, lays the foundation for ha¬ bitual epilepsy. To an inattentive practitioner, indeed, the phenomena appear similar to those of epilepsy •, but, independent of its violence and fatality, there are many circumstances peculiar to it. This has been remarked by several authors, particularly Dr Denman 5 but those circumstances have never been accurately pointed out in any publication which has fallen into my hands. “ The eclampsia, peculiar to pregnancy and labour, differs from epilepsy in the following respects. “ 1. The symptoms which precede the attack are well marked, announcing to an experienced practitioner the approach of the disease. “ 2. If the first fit do not prove fatal, and if no means of cure be attempted, it is within a few hours followed by other paroxyms, provided delivery do not take place. “ 3. After the paroxysms, even where they have been very severe, the patient in many cases continues quite sensible during the intervals, and the sensibility returns the moment the fit is off. “ 4. What may appear still more extraordinary is, that in some cases there is a remarkably increased sus¬ ceptibility of impression of the external senses j and this supersensation is not confined to patients in whom the convulsions are slight. “ The aura epileptica never occurs in the cases al¬ luded to. “ 6. The pulse is, in every case, affected in some degree during the remissions of the fits. It is slow, or oppressed, or intermitting, or frequent and rapid. Eut it is most commonly slow and oppressed, becoming ful¬ ler and more frequent after blood-letting. The symptoms above hinted at as preceding the fits are, violent headach, or sudden delirium, or violent tremors during the second stage of labour. Impaired or depraved vision commonly prove the immediate har¬ bingers of the fit. The event of this occurrenbe is al¬ ways precarious, for a single fit may destroy the pa¬ tient. Death happens in such cases in two ways, viz. either by rupture of some of the vessels within the head, or by the rupture of the womb itself. The cause of the disease is evidently an overload in the vessels within the cranium, and this may be occa¬ sioned from a variety of causes, as violent labour throes, passions of the mind, irritations in the primee via;, &c. In cases of so very alarming a nature, it is not won¬ derful that practitioners have differed much respecting the practice to be adopted. The following is what has been recommended by Dr Hamilton in the volume of Dr Duncan’s annals already referred to. “ TV hen fits have actually occurred during the latter months of pregnancy, the first remedy to be employed, after having adopted the suitable means for protecting the tongue, is blood-letting, both general and topical. Vol. XIV. Part I. + I F E R Y. 73 Opening the external jugular might answer both pur- Pretema- poses, but the restlessness of the patient in many cases tural Par- makes the surgeon or attendants dread this operation, turition. A quantity of blood, therefore, adapted to the exigency '"““'v™--' of the case, is to be drawn from the arm, and cither a branch of the temporal artery is to be divided, or seve¬ ral leeches are to be applied to the temples. After the bleeding, a powerful laxative glyster ought to he exhi¬ bited. And if there he any evidence of disordered primse vise, an emetic must, if possible, be given. The state of the os uteri is then to be ascertained j and if labour have not commenced, no attempts whatever are to be made to promote that process. In some rare cases however, where the bulk of the gravid uterus is enor¬ mous, it may be necessary to remove a part of its con¬ tents j but such cases cannot happen once in a thousand instances of the disease. 1 “ Should the fits still continue, the head must he shav¬ ed, and covered with a large blister ; and if the oppres¬ sion or fulness, or hardness of the pulse, be not removed, the blood-letting is to be repeated. “ As soon as the patient becomes capable of swallow¬ ing, the camphor, in doses of ten grains, ought to be given every three or four hours. The most efficacious and palatable form in which this medicine can he pre¬ scribed, is by suspending it in boiling water, through the medium of alcohol, sugar and magnesia. Its use must be persevered in for several days, gradually lessen¬ ing the number of doses. “ V here the eclampsia has been preceded by oedema, the digitalis may be employed with much success. “ Convulsions during labour are to be treated upon the same principles, with these additional precautions, that delivery is to be accomplished by the most expedi¬ tious possible means, and that if the delivery he fol¬ lowed by uterine haemorrhagy, the discharge is for some time to be rather encouraged than checked. 1 knew two instances of the fits, which had been suspended for some hours, recurring, in consequence of the flooding being- stopped, and in both cases the convulsions were remov¬ ed, by allowing the discharge to return'. “ When the symptoms that precede eclampsia, take place in the latter months of pregnancy, the most certain method of guarding against the threatening ac¬ cident is, having recourse to immediate blood-letting, and afterwards prescribing camphor, attention to the state of the bowels, and a spare diet. “ When the same symptoms occur during labour, a copious bleeding should he instantly ordered, and the appropriate means of terminating the delivery should be adopted with as much expedition as may be consistent with the safety both of mother and child. “ In these concise practical suggestions, practitioners will observe circumstances omitted, which have been recommended by gentlemen of deserved professional eminence, and novelties of practice proposed, which I believe have not hitherto been explicitly advised. Some explanation, therefore, of the plan above recommended may perhaps be expected. “ The most obvious remedy apparently omitted is opium. This powerful medicine was not prescribed, as far as we have reason to know, by the practitioners who lived at the end of the 17th and beginning of the 18th centuries. The first author who, in strong terms, asserts the efficacy of opium in such cases, appeals to be the K translator 74 M I D W Pretenva- translator of Astruc’s Midwifery (a-) •, and his opinion has been adopted by Dr Denman (b), and by Dr Bland (c). But in every case ol true eclampsia, during pregnancy or labour, opiates do irreparable mischief, where a copious bleeding has not been premised 5 and even where that precaution has been attended to, they have been found useless, it not hurtful. Melancholy experience has completely established in my mind this practical precept} and I consider it to be a matter of very great moment, that it should be universally known j for general practitioners, who are often first called to those cases w here the fits happen during pregnancy, are extremely apt to prescribe opium: I can solemnly de¬ clare, that no patient to whose assistance I have been called, who had taken a dose of opium previous to my arrival, has recovered, and I have known that medi¬ cine given in almost every variety ot dose. My father, Dr A. Hamilton, of whose judgment and practical knowledge it does not become me to speak in the terms they so justly merit, prevented my ever employing opium under such circumstances. “ A second remedy extolled by Dr Denman, and now, after a fair trial, rejected in my practice, is vo¬ miting. This seems to have been a very common pre¬ scription in the time of Mauriceau, as he takes great pains to point out its hurtfulness in several parts of his •works (d). Where there are unequivocal marks of disordered stomach, an emetic may be prescribed with advantage after blood-letting, but it should be avoided under all other circumstances. “ With regard to the warm-bath, which is a favou¬ rite remedy among foreign practitioners, and has been advised by several British authors, I have never had an opportunity of trying its effects. Upon theoretical principles I should reject it j but my chief reason for never having directed its use, has been the impossibility, in ordinary cases of practice, of commanding a warm bath into which a woman in such a situation could be put. “ Dashing cold water by surprise upon the face is a practice suggested by Dr Denman, and on which he had much dependence at one period. Experience les¬ sened his hopes, and, many years ago, prevented my ever indulging any. I gave it several fair trials, (once or twice in public in the lying-in-ward of the Royal Infirmary), and had even reason to be convinced, that it rather aggravated than diminished the violence of the paroxysms.” In addition to these observations it may be pro¬ per to remark, that a much larger quantity of blood should be drawn in those cases than has commonly been done. Dr H. advises forty ounces to be taken at this first bleeding, and the same quantity to be again drawn within an hour, if the symptoms be not mitiga¬ ted ; and he talks with the utmost confidence of the utility of this practice. 3 ^ J'. Although the woman be delivered safely both of F E R Y. Chap. IV. the child and afterbirth, she may sink very soon af- Pretcma- ter in consequence of internal flooding. This is to turalPar. be suspected if the patient suddenly complain of giddi- ness or sickness, or singing in the ears, or impaiied vi¬ sion j or if she become delirious, with a pallid face and cold limbs. The state of the pulse at the wrist too should lead a judicious practitioner to suspect the exist¬ ence of internal flooding. Positive certainty of this ac¬ cident may be obtained by feeling through the belly the condition of the uterus j or, more, certainly, still, by feeling the state of the vagina, for if its panetes ap¬ proach, there is not much probability of there being any considerable internal hsemorrhagy j whereas, if it he found filled with coagulated blood, there is a certain¬ ty, that the womb too is distended from the same cause. This accident is entirely owing to the womb not having contracted with sufficient energy. It very often proves the cause of sudden and unexpected death. The boldest and apparently most violent measures are required to save the patient in many of those cases. The womb and vagina must be immediately emptied, and such pressure must he made on the inside of the uterus with the hand, as shall force it into contraction. In some cases cold water in great quantity must be dashed from a height on the naked belly at the same time j and in the mean while the strength of the pa¬ tient must be supported with large doses of opium. If there be vomiting, which is a frequent symptom in such cases, five grains of solid opium should be gi\en at first, and afterwards three grains every three or four hours, till the pulse becomes steady and the strength recruit¬ ed, when the opiates are to be withdrawn and lessen¬ ed by degrees. The writer ol this article cannot avoid this opportunity of paying a just tribute ot respect to the practical discernment of the able editor of the New London Medical Dictionary, who seems the first author who has mentioned this practice ot giving large doses of opium j a practice by which many valuable lives have been saved. Conclusion.—In the preceding account of the devia¬ tions, which sometimes happen in the process of human parturition, although we have endeavoured to give a full view of the subject, we have not pursued the beaten tract. But as this article may rather he consulted by many as a dictionary, than pursued regularly as a trea¬ tise,* we shall add the ordinary arrangement of labours, with the reference to the numerical articles, under which the several varieties may be found. Labours are divided into four classes 5 viz. natural, laborious, preternatural, and complex. Natural labour comprehends all cases where the head of the infant is forced foremost j and the whole process is completed with safety, both to mother and child, within twenty-four hours from the commencement. It is described under articles 48. to 60. Laborious fA'l The Art of Midwifery, &c. 8vo. London, printed for J. Nourse 1767. Appendix, p. 295. (B)Vol.ii. p.418. (c) Loco citato, page 136. (d) Particularly in Aphorism 232. “ L’emetique est permcieux aux femmes grosses, on nouvellement a.- couchees, qui sont surprises des convulsions.” And Levret, page 451. of his L’Art ues Aceom^roens say ^ in reference to that aphorism, “ Cette sentence est de$ mieux fondees, et elle doit etre ngoureusement oKerv . dans tons ses points.” 1 CoA -"vV 11 hap. IV. MIDWIFERY. 75 inclusion. Laborious labour is that where, although the head I—y—Jof the infant be forced foremost, the process is pro¬ tracted beyond twenty-four hours from the commence¬ ment. It is divided into three orders : First, where the natural powers at last, gfter much suffering on the part of the mother, complete the delivery. See article 64. Secondly, Where, although the action of the uterus be inadequate to the expulsion of the infant, it is prac¬ ticable to extract the child through the natural passages, without injury either to it or to the mother. See ar¬ ticles 66. to 74-82. and 84. Thirdly, Where it is impossible to extract the child alive through the natural passages. See articles 80. and 99. to 133. Preternatural labours comprehend all cases where any other part of the child than the head is forced fore¬ most •, and consist of two orders : ' First, Presentations of the lower extremities, viz. footling cases, article 87. Breech cases, article 91. Cases where one foot presents, article 89. and knee- cases, article 90. Plates. Secondly, Presentations of the superior extremities Explana- or other parts than the head or lower extremities, ar- tioiyof the tides 192. to 196. Complex labours include all cases where any other " circumstances than those enumerated under the former three classes take place, viz. Cases where the pelvis is too large, articles no. and ill. Cases where haemorrhagy occurs at the beginning of labour, article 76. or at the conclusion of that process, articles 152. and 153. Cases where there is more than one child, articles 143, 144, 145. Cases where the patient had previously been affected with umbilical hernias, article 146. Cases where convulsions happen, articles I47> 148. Cases where the navel-string is twisted round the neck of the infant, article 140. or where it is forced down along with some part of the child, article 141. And cases of rupture of the uterus, article 65. EXPLANATION of the PLATES. Plate CCCXLVI. Fig. 1. A front view of the uterus in the unirapreg- nated state, in situ, suspended in the vagina j the an¬ terior parts of the ossa ischia, with the ossa pubis, pu¬ denda, perineum, and anus being removed, in order to show the internal parts. A, The last lumbar vertebra. B, B, The ossa ilia. C, C, The acetabula. D, D. The inferior and posterior parts of the ossa ischia. E, The part covering the extremity of the coccyx. F, The inferior part of the rectum. G, G, The vagina cut open longitudinally, and stretched on each side of the cervex uteri, in order to show the manner in which the uterus is suspended in it. H, H, Part of the urinary bladder stretched on each side of the vagina and inferior part of the fundus uteri. I, The cervix uteri. K, The fundus uteri. L, L, The fallopian tubes. M, M, The ovaria. N, N, The broad ligaments. O, O, The superior part of the rectum. Fig. 2. A view of the internal parts as seen from the right groin, the pelvis having been divided vertically. A, The lowest vertebra of the loins. B, C, The os sacrum and coccyx with the integu¬ ments. D, The left os ilium. E, The inferior part of the os ischium, F, The os pubis of the same side. G, The foramen magnum. H, The acetabulum. I, The inferior part of the rectum. K, The os externum and vagina, the os uteri lying loosely in the latter. L, The vesica urinaria. M, N, The cervix and fundus uteri, with a view of the cavity of the uterus. The attachment of the vagi¬ na to the uterus, and the situation of the uterus when pressed down by the intestines and bladder into the concave part of the os sacrum, are likewise shown. O, The broad ligament of the left side. P, P, The left fallopian tube. Q, The left ovarium. R, R, The superior part of the rectum and inferior part of the colon. Fig. 3. Is a sketch taken from Dr Hunter’s magni¬ ficent plate, N° 6. of the gravid uterus. All the fore part of the uterus and secundines (which included the placenta) is removed. The navel-string is cut, tied, and turned to the left side over the edge of the womb. At the fundus the investing membranes are likewise turned over the edge of the womb, that they might be more apparent. The head of the child is lodged in the lower part of the womb, or in the cavity of the pelvis, and its body lies principally in the right side. Its po¬ sition is diagonal or oblique, so that its posterior parts are turned forwards, and to the right side of the mo¬ ther, and its fore parts are directed backwards, and to the left side. Its right foot appears between its left thigh and leg. Every part is stated by Dr Hunter to have been represented just as it was found. Fig. 4. A front view of the gravid uterus in the first stage of labour ; the anterior parts are removed, but the membranes not being ruptured, form a large bag containing the foetus and the liquor amnii. A, x\, The substance of the uterus. B, B, C, C, D, D, E, E, The bones of the pelvis. G, G, The vagina. H, H, The os uteri dilated during a pain j with I, The membranes containing the liquor amnii pro¬ truding through it. K, The chorion. K 2 Lp 76 MIDWIFERY. Explana- L, The chorion dissected off at the hack of the ute- tion of the riis, to show the head of the child through the amnios. M, The placenta ; the lohulated surface, or that which is attached to the uterus, being shown. Chap. IV. Plate CCCXLVIII. Plates. Plate CCCXLVII. Fig. i. Represents a well-formed pelvis. A, A, The ossa ilia, properly so called. o, ft, The iliac fossas. b, b, The linea innominata, making part of the brim of the pelvis. c, c, The crista of the ossa ilia. c, e, Their superior anterior spinous processes. B, B, The os ischium. f,f, Its tuberosities. h, h, Its branches. C, C, The body of the os pubis. i, i, The crista pubis. k, k, Its descending branch uniting with that of the ischium. /, The symphysis pubis. D, D, The os sacrum. t?z, m, Its base. n, n, The gacro-iliac synchondrosis. o, Its internal surface called hollow. jo, Its apex to which the coccyx is joined. E, The coccyx. Fig. 2. Represents a vertical section of the pelvis. A, The promontory of the sacrum. B, The point of the coccyx. The distance from these two points marks the depth of the pelvis behind, which in the majority of cases is six inches. C, The spinous process of the ischium. D, The tuberosity of the ischium. E, The crista pubis, the distance which two points marks the depth of the pelvis at the sides, and is ordi¬ narily about four inches. F, The foramen thyroideum. G, The surface by which the two ossa pubis are join¬ ed to form the symphysis pubis, and by which junction the depth of the pelvis at the front is reduced to about one and a half inch. Fig. 3. Represents the brim of a well-formed pelvis. A, B, The short or conjugate diameter between pu¬ bis and sacrum, which measures commonly a little less than four inches. C, D, The long diameter in the skeleton, which, however, in the living subject, is rendered almost as short as the former, in consequence of the bellies of the psose muscles being lodged in the lower cav^y of the tunica innominata. E, F, The diagonal diameter in the skeleton, which, in fact, is the long diameter in the living body, and measures somewhat less than five inches. Fig. 4. Represents the outlet of a well-formed pelvis. A, B, The short diameter, extending from one tu¬ berosity of the ischium to the other, and measuring less than four inches. C, D, The long diameter, extending from the lower edge of the symphysis pubis to the point of the coccyx, and measuring nearly five inches. Fig. 5. Represents the brim of a distorted pelvis. Fig. 6. Represents the outlet of a deformed pelvis. Fig. 1. The foetal heart. n, The right ventricle. 6, The right auricle. c, The left auricle. ft', Branches of the pulmonary veins of the right lobe of the lungs, those of the left being cut off short. r, Arteries of the left lobe of the lungs. f\ The vena cava descendens. g, The aorta descedens. The trunk of the arteria pulmonalis. The ductus arteriosus. Fig. 2. Represents the first stage of natural labour^ towards its termination. A, The membranes of the ovum distending the cer¬ vix uteri, while the head of the child is just entering the brim of the pelvis. B, B, The os uteri nearly dilated. C, The vagina. D, The orificium externum. Fig. 3. Represents the second stage of natural la¬ bour, when the head has descended into the cavity of the pelvis, while the face is still towards the sacro-iliac synchondrosis. Fig. 4. Represents the second stage of natural labour, after the head has advanced so far that the face is in the hollow of the sacrum, and the vertex in the arch of the pubis. Plate CCCXLIX. Fig. I. A view of a deformed pelvis when the defi¬ ciency of space is not very considerable. Fig. 2. The child’s skull. «, The vertex, or posterior fontanelle. b. The anterior fontanelle. Fig. 3. and 4. The common short forceps, reduced to one-fourth of the natural size. The instrument, when of the proper size, is in length 11 inches. The length of each handle is four inches and a half. If a straight line be drawn through the plane surface of one handle, and be produced to the extremity of the instrument (which forms the axis of the handles when both are joined), the convex edge of the blade, at the greatest distance from this line, is di¬ stant 1^ inch ; and the extreme distance of the point on the opposite edge is -j-^ths of an inch. hen both blades are joined, their greatest width is 2^ inches. The right-hand blade has a hinge between the handle and blade, by which it is easily introduced, while the pa¬ tient lies on the left side. Fig. 5. and 6. Views of Lowder’s lever $ for a par¬ ticular description of which, see art. 69. Fig. 7. Orme’s perforator reduced to one-fourth the natural size. Fig. 8. Embryotomy forceps, one-fourth the natural size. Fig. 9. The crotchet, one-fourth the natural size. Plate CCCL. % Fig. I. Represents an ordinary sized child forced against the brim of a deformed pelvis. Fig. 2. Represents the child when the feet had pre¬ sented, turned into that direction by which its head is best Explana¬ tion of the. Plates. UTArr/ttA*/// Srufys.' V t 77 iap. IV. MID W best brought through the brim and cavity of the pelvis, viz. with the face towards the sacro-ilxac synchondrosis of one side. Fig. 3. Represents the ordinary situation of the in¬ fant in breech presentations j from which it is evident, that unless the infant be very small, the natural action I F E li Y. of the uterus cannot force it through the pelvis in this direction. Fig. 4. Represents an arm presentation, and commu¬ nicates an idea of the difficulty of bringing down the feet, and turning the infant in that position. M I E edniki MIEDNIKI, or Medniki, or JFarmiCy a town of || Samogitia, and the residence of the bishop. It is 28 dieris. miles N. E. from Konigsberg, and 60 miles S.S.W. from Mittau. MIEKOW, a town of Austrian Poland, in the pa¬ latinate of Cracow. The founder of this town is said to have been Gripsius Jana, who built it after the mo¬ del of Jerusalem, when he returned from a pilgrimage to that city. It is 12 miles north from Cracow. M1EL, Jan, called Giovanni della Vile, a most eminent painter, was born in Flanders in 1590. He was at first a disciple of Gerard Seghers, in whose school he made a distinguished figure 5 but he quitted that artist, and went to Italy, to improve himself in design, and to obtain a more extensive knowledge of the several branches of his art. At Rome he parti¬ cularly studied and copied the works of the Caracci and Corregio *, and was admitted into the academy of Andrea Sacchi, w'here he gave such evident proofs of extraordinary merit and genius, that he W’as invited by Andrea to assist him in a grand design which he had already begun. But Miel, through some disgust, re¬ jected those elevated subjects which at first had enga¬ ged his attention, refused the friendly proposal of Sacchi, and chose to imitate the style of Bamboccio, as having more of that nature which pleased his own imagination. His general subjects were huntings, car¬ nivals, gypsies, beggars, pastoral scenes, and conver¬ sations j of those he composed his easel pictures, which are the finest of his performances. But he also paint¬ ed history in a large size in fresco, and in oil; which, though they seem to want elevation of design, and a greater degree of grace in the heads, yet appear supe¬ rior to what might be expected from a painter of such low subjects as he generally was fond ol representing. His pictures of huntings are pai'ticularly admired : the figures and animals of every species being designed with uncommon spirit, nature, and truth. The transparence of his colouring, and the clear tints of his skies, enliven his compositions j nor are his paintings in any degree inferior to those of Bamboccio either in their force or lustre. His large works are not so much to be com¬ mended for the goodness of the design as for the ex¬ pression and colouring 5 but it is in his small pieces that the pencil of Miel appears in its greatest delicacy and beauty. The singular merit of this master recom¬ mended him to the favour of Charles Emanuel duke of Savoy, who invited him to his court, where he ap¬ pointed Miel his principal painter, and afterwards honoured him with the order of St Mauritius, and made him a present of a cross set with diamonds ot great value, as a particular mark of his esteem. He died in 1664. MIERIS, Francis, the Old, a justly celebrated painter, was born at Leyden in 163 5 j and w'as at first placed under the direction of Abraham M I E Toorne Vliet, one of the best designers, of the Low jvjierp Countries, and afterwards entered himself as a disciple . with Gerard Douw. In a short time he far surpassed all his companions, and was by his master called the prince of his disciples. His manner of painting silks, velvets, stuffs, or carpets, was so singular, that the different kinds and fabric of any of them might easily be distinguished. His pictures are rarely to be seen, and as rarely to be sold; and when they are, the pur¬ chase is extremely high, their intrinsic value being so incontestably great. Besides portraits, his general sub¬ jects were conversations, persons performing on musical instruments, patients attended by the apothecary or doctor, chemists at work, mercers shops, and such like j and the usual valuation he set on his pictures was esti¬ mated at the rate of a ducat an hour. The finest por¬ trait of this master’s band is that which he painted for the wife of Cornelius Plants, which is said to be still preserved in the family, although very great sums have been offered for it. In the possession of the same gentle¬ man was another picture of Mieris, representing a lady fainting, and a physician applying the remedies to relieve her. For that performance he wras paid (at his usual rate of a ducat an hour) so much money as amounted to fifteen hundred florins when the picture was finished. The grand duke of Tuscany wished to purchase it, and offered three thousand florins for it; but the offer was not accepted. However, that prince procured several of his pictures, and they are at this day an ornament to the Florentine collection. One of the most curious of them is a girl holding a candle in her hand, and it is accounted inestimable. This painter died in 1681. Mieuis, William, called the Young Mieris, was son of the former, and born at Leyden in 1662. During the life of his father, he made a remarkable pro¬ gress : but, by being deprived of his director when he wras only arrived at the age of nineteen, he had re¬ course to nature, as the most instructive guide j and by studying with diligence and judgment to imitate her, he approached near to the merit of his father. At first he took his subjects from private life, in the man¬ ner of Francis ; such as tradesmen in their shops, or a peasant selling vegetables and fruit, and sometimes a woman looking out at a window ; all which he copied minutely after nature, nor did he paint a single object without his model. As Mieris had observed the com¬ position of Gerard Lairesse, and other great historical painters, with singular delight, he attempted to design subjects in that style ; and began with the story of Ri- naldo sleeping, on the lap of Armida, surrounded with the Loves and Graces, the fore ground being enriched with plants and flowers ; a work which added greatly to his fame, and was sold for a very high price. This master also painted landscapes and animals with equal truth and neatness ; and modelled in clay and wax, in so sharp and accurate a manner, that he might justly M I G be ranked among the most eminent sculptors, delicate finishing of his works, he imitated his father ; as he likewise did in the lustre, harmony, and truth, of his paintings, which makes them to be almost as highly prized j but they are not equal in respect ot de¬ sign, or of the striking effect, nor is his touch so very exquisite as that of the father. The works of the old Mieris are better composed, the figures are better grouped, and they have less confusion 5 yet the younger Mieris is acknowledged to be an artist of extraordinary merit, although inferior to him, who had scarcely Ins equal. He died in 1747. _ Mieris, Francis, called the Young Francis, was the son of William, and the grandson of the celebrated Francis Mieris j and was born at Leyden in 1689. He learned the art of painting from his father, whose manner and style he always imitated j he chose the same subjects, and endeavoured to resemble him in his colouring and pencil. But with all his industry ie proved far inferior to him : and most of those pictures which at the public sales are said to be ol the young Mieris, and many also in private collections ascribed to the elder Francis, or William, are perhaps originally painted by this master, who was far inferior to both j or are only his copies after the works of those excellent painters, as he spent abundance of his time in copying their performances. „,, , MIEZA, in Ancient Geography, a town ot Macedo¬ nia, which was anciently called Strymonium, situated near Stagira. Here, Plutarch informs us, the stone seats and shady walks of Aristotle were shown. Of tins place was Peucestas, one of Alexander’s generals, and therefore surnamed Miezceus, (Arrian). MIGDOL, or Magdol, in Ancient Geography, a place in the Lower Egypt, on this side Pihahiroth or between it and the Red sea, towards its extremity. 1 ie term denotes a tower or fortress. It is probably the Magdoluni of Herodotus, seeing the Septuagint render it by the same name. . MIGNARD, Nicholas, an ingenious irench painter born at Troyes in 1628 j but, settling at Avig¬ non, is generally distinguished from his brother Peter by the appellation of Mignard of Avignon. He was afterwards employed at court and at 1 aris,. where he became rector of the royal academy ot painting. There is a great number of his historical piecesand por¬ traits in the palace of the Tbuilleries. He died in 1690. Mignard, Peter, the brother of Nicholas, was born at Troyes in 1610 5 and acquired so much of the taste of the Italian school, as to be known by the name of the Roman. He was generally allowed to have a su¬ perior genius to his brother Nicholas 3 and had the honour of painting the popes Alexander VII. and Ur¬ ban VIII. besides many of the nobility at Rome, and several of the Italian princes: his patron, Louis, sat ten times to him for his portrait, and respected his ta¬ lents so much as to ennoble him, make him his princi¬ pal painter after the death of Le Brun, and appointed him director of the manufactories. He died in 1695, and many of his pieces are to be seen at St Cloud. M1GNON, or Minjon, Abraham, a celebrated painter of flowers and still life, was born at Francfort in 1639 3 and his father having been deprived of the greatest part of his substance by a series of losses in , trade, left him in very necessitous circumstances when 3 [ 78 ] MIG In the he was only seven years of age. From that melan- Mignon, choly situation he was rescued by the friendship of Migration James Murel, a flower painter in that city 3 who took * —' Mignon into his own house, and instructed him in the art till he was 17 years old. Murel had often observed an uncommon genius in Mignon : he there¬ fore took him along with him to Holland, where he placed him as a disciple with David de Heem 3 and while he was under the direction of that master he la¬ boured with incessant application to imitate the man¬ ner of De Heem, and ever afterwards adhered to it 3 only adding daily to his improvement, by studying nature with a most exact and cuiious obser\ ation. “ When we consider the paintings of Mignon, one is at a loss (Mr Pilkington observes) whether more to admire the freshness and beauty ol his colouring, the truth in every part, the bloom on his objects, or the perfect resemblance of nature visible in all his perform¬ ances. He always shows a beautiful choice in those flowers and fruits from which his subjects are compos¬ ed : and he groups them with uncommon elegance. His touch is exquisitely neat, though apparently easy and unlaboured 3 and he was fond of introducing in¬ sects among .the fruits and flowers, wonderfully finished, so that even the drops of dew appear as round and as translucent as nature itself.” He had the good for¬ tune to be highly paid for his works in his lifetime ; and he certainly would have been accounted the best in his profession even to this day, if John Van Huy- sum had not appeared. Weyerman, who had ssen many admired pictures of Mignon, mentions one of a most capital kind. The subject of it is a cat, which had thrown down a pot of flowers, and they lie scatter¬ ed on a marble table. That picture is in every re¬ spect so wonderfully natural, that the spectator can scarce persuade himself that the water which is spilled from the vessel is not really running down from the marble. This picture is distinguished by the title of Mignon's Cat. This painter died in 1679, aged only 40. MIGRATION, the passage or a removal of a thing out of one place into another. r. Migration of Birds.—It has been generally be-M^01 lieved, that many different kinds of birds annually passj^™/ from one country to another, and spend the summer or the winter where it is most agreeable to them 3 and that even the birds of our own island will seek the most distant southern regions of Africa, when directed by a peculiar instinct to l^ave their own country. It has long been an opinion pretty generally received, that swallows reside during the winter season in the warm southern regions 3 and Mr Adanson particularly relates his having seen them at Senegal when they were obli¬ ged to leave this country. But besides the swallow, Mr Pennant enumerates many other birds which mi¬ grate from Britain at different times of the year, and are then to be found in other countries 3 after which they again leave these countries, and return to Britain. The reason of these migrations he supposes to be a de¬ fect of food at certain seasons of the year, or the want ■ of a secure asylum from the persecution of man during the time of courtship, incubation, and nutrition. Hie following is his list of the migrating species. . 2 1. Crows. Of this genus, the hooded crow migrates Birds tin regularly with the woodcock. It inhabits North Bri- tain the whole year : a few are said annually to breed • on Aft MIG L 79 ] MIG . tjon<'on Dartrtioor, in Devonshire. It breeds also in Swe- den and Austria : in some of the Swedish provinces it only shifts its quarters, in others it resides throughout the year. Our author is at a loss for the summer re¬ treat of those which visit us in such numbers in winter, and quit our country in the spring; and for the reason why a bird, whose food is such that it may be found at all seasons in this country, should leave us. 2. Cuckoo. Disappears early in autumn ; the retreat of this and the following bird is quite unknown to us. 3. Wryneck. Is a bird that leaves us in the winter. If its diet be ants alone, as several assert, the cause of its migration is very evident. This bird disappears be¬ fore winter, and revisits us in the spring a little earlier than the cuckoo. 4. Hoopoe. Comes to England but by accident ; Mr Pennant once indeed heard of a pair that attempt¬ ed to make their nest in a meadow at Selborne, Hamp¬ shire, butwere frightened away by the curiosity of people. It breeds in Germany. 3. Grous. The whole tribe, except the quail, lives here all the year round : that bird either leaves us, or else retires towards the sea coasts. 6. Pigeons. Some few of the ring doves breed here ; but the multitude that appears in the winter is so disproportioned to what continue here the whole Tear, as to make it certain that the greatest part quit the country in the spring It is most probable they go to Sweden to breed, and return from thence in au¬ tumn; as Mr Ekmark informs us they entirely quit that country before winter. Multitudes of tbe com¬ mon wild pigeons also make the northern retreat, and visit us in winter; not but numbers breed in the high cliffs in all parts of this island. The turtle also pro¬ bably leaves us in the winter, at least changes its place, removing to the southern countries. 7. Stare. Breeds here. Possibly several remove to other countries for that purpose, since the produce of those that continue here seems unequal to the clouds of them that appear in winter. It is not unlikely that many migrate into Sweden, where Mr Berger observes they return in spring. 8. Thrushes. The fieldfare and the redwing breed and pass their summers in Norway and other cold coun¬ tries ; their food is berries, which abounding in our kingdoms, tempts them here in the winter. These two and the Royston crow’ are the only land birds that re¬ gularly and constantly migrate into England, and do not breed here. The hawfinch and crossbill come here at such uncertain times as not to deserve the name of ! birds of passage. 9. Chatterer. The chatterer appears annually about Edinburgh in flocks during winter; and feeds on the berries of the mountain asln In South Britain it is an accidental visitant. 10. Grosbeaks. The grosbeak and crossbill come here but seldom ; they breed in Austria. The pine grosbeak probably breeds in the forests of the IligliT lands of Scotland. 11. Buntings. All the genus inhabits England throughout the year ; except the greater brambling, which is forced here from the north in very severe seasons. 12. Finches. All continue in some parts of these kingdoms, except the fiskin, which is an irregular visi¬ tant, said to come from Russia. The linnets shift their quarters, breeding in one part of this island, and Migration., remove with their young to others. All finches feed 1 ■ - v— on the seeds of plants. 13. Larks,fly-catchers^ wag-tails, and uiarblers. All of these feed on insects and worms; yet only part of them quit these kingdoms ; though the reason of mi¬ gration is the same to all. The nightingale, black¬ cap, fly-catcher, willow-wren, wheat-ear, and white- throat, leave us before winter, while the same and de¬ licate golden-crested wuen braves our severest frosts. The migrants of this genus continue longest in Great Britain in the southern counties, tbe winter in those parts being later than in those of the north; Mr Stillingfleet having observed several wheat-ears in the isle of Purbeck on tbe 18th of November. As these birds are incapable of very distant flights, Spain, or the south of France, is probably their winter asy¬ lum. 14. Swallows and goatsucker. Every species disap¬ pears at the approach of winter. Water-Fowl. On the vast variety of w7ater fowl that frequent Water- Great Britain, it is amazing to reflect how’ few are fowl- known to breed here : the cause that principally urges them to leave this country, seems to be not merely the want of food, but the desire of a secure retreat. Our country is too populous for birds so shy and timid as the bulk of these are : when great part of our island was a mere waste, a tract of woods and fen, doubt¬ less many species of birds (which at this time mi¬ grate) remained in security throughout the year.— Egrets, a species of heron now scarcely known in this island, were in former times in prodigious plen¬ ty ; and the crane, that has totally forsaken this coun¬ try, bred familiarly in our marshes: their place of incubation, as well as of all other cloven footed wa¬ ter-fowl (the heron excepted), being on the ground, and exposed to every one. As rural economy increased in this country, these animals were more and more di¬ sturbed ; at length, by a series of alarms, they were ne¬ cessitated to seek, during the summer, some lonely safe habitation. On the contrary, those that build or lay in tbe al¬ most inaccessible rocks that impend over the British seas, breed there still in vast numbers, having little to fear from the approach of mankind : the only disturb¬ ance they meet with in general being from the despe¬ rate attempts of some few to get their eggs. Cloven-footed Water-fowl. 15. Herons. The white heron is an uncommon bird, and visits us at uncertain seasons; the common kind and the bittern never leave us. 16. Curlews. The curlew breeds sometimes on our mountains: but, considering the vast flights that ap^ pear in winter, it is probable that the greater part retire to other countries : the whimbrel breeds on the Grampian hills, in the neighbourhood of Invercauld, 17. Snipes. The woodcock breeds in the moist woods of Sweden, and other cold countries. Some snipes breed here, but the greatest part retire else¬ where : as do every other species of this genus. 18 Sandpipers. The lapwing continues here the whole year; the ruff breeds here, but retires in winter; the M I G [ 80 ] •ulion. the redshank ami sandpiper breed m tins country, and 1 reside here. All the others absent themselves during summer. , , , in. Plovers and oyster-catcher. The long-legged plover and sanderling visit us only in winter; the dot¬ trel appears in spring and in autumn ; yet, what is very singular, we do not find it breeds in South Britain. The oyster-catcher lives with us the whole year, ihe Norfolk plover and sea-lark breed in England. Ihe preen plover breeds on the mountains ot the north ot England, and on the Grampian hills. We must here remark, that every species of the ge¬ nera of curlews, woodcocks, sandpipers, and plovers, that forsakes us in the spring, retires to Sweden, l o- land, Prussia, Norway, and Lapland, to breed : as soon as the young can ily, they return to us again, because the frosts which set in early in those countries totally deprive them of the means of subsisting ; as the dry¬ ness and hardness of the ground, in general, during our summer, prevent them from penetrating the earth with their bills, in search of worms, which are the natural food of these birds. Mr Ekmark speaks thus of the yetreat of the whole tribe of cloven-footed water-fowl out of his country (Sweden) at the approach of win¬ ter ; and Mr Klein gives much the same account of those ef Poland and Prussia. 20. Rails andgallimdes. Every species of these two genera continues with us the whole year; the land-rail excepted, which is not seen here in winter. It likewise continues in Ireland only during the summer months, w/hen they are very numerous, as Mr Smith tells us m the History of Waterford, p. 336. Great numbers ap¬ pear in Anglesea the latter end ot May ; it is supposed that they pass over from Ireland, the passage between the two islands being but small. As we have instances of these birds lighting on ships in the Channel and the bay of Biscay, we may conjecture their winter quarters to be in Spain. Finned-footed Water Birds. 21. Phalaropes. Visit us but seldom ; their breeding place is Lapland, and other arctic regions. 22. Grebes. The great crested grebe, the black and white grebe, and little grebe, breed with us, and never migrate; the others visit us accidentally, and breed in Lapland. . Web-footed Birds. 23. Avoset. Breed near Fossdike in Lincolnshire, but quit their quarters in winter. They are then shot in different parts of the kingdom, which they visit, not regularly, but accidentally. 24. Auks and guillemots. The great auk or pinguin sometimes breeds in St Kilda. I he auk, the guillemot, and puffin, inhabit most of the maritime cliffs of Great Britain, in amazing numbers, during summer. The black guillemot breeds in the Bass isle, and in St Kilda, and sometimes in Llandidno rocks. We are at a loss for the breeding place of the other species ; neither can we be very certain of the winter residence of any of them excepting of the lesser guillemot and black-billed auk, which, during winter, visit in vast flocks the frith of Forth. 25. Divers. These chiefly breed m the lakes of Sweden and Lapland, and in some countries near the 2 M I G pole; but some of the red-throated divers, the northern MEratian and the imber, may breed in the north of Scotland and its isles. 26. Demis. Every species breeds here ; but leaves us in the winter. 27. Petrels. The fulmar breeds in the isle of St Kilda, and continues there the whole year except Sep¬ tember and part of October : the shearwater visits the isle of Man in April; breeds there ; and, leaving it in August or the beginning of September, disperses over all parts of the Atlantic ocean. The stormfinch is seen at all distances from land on the same vast Watery ti'act; nor is ever found near the shore except by some very rare accident unless in the breeding season. Mr Pennant found it on some little rocky isles ofl the north of Skye. It also breeds in St Kilda. He also suspects that it nestles on the Blasquet isles oft- Kerry, and that it is the gourder of Mr Smith. 28. Mergansers. This whole genus is mentioned among the birds that fill the Lapland lakes during sum¬ mer. Mr Pennant has seen the young of the red-breast¬ ed in the north of Scotland : a lew ol these, and perhaps of the goosanders, may breed there. 2Q. Ducks. Of the numerous species that form this genus, we know ol few that breed here: J he swan and goose, the shield duck, the eider duck, a few shovelers, garganieS; - and teals, and a very small portion of the wild ducks. The rest contribute to form that amazing multi¬ tude of water-fowl that annually repair from most parts of Europe to the woods and lakes of Lapland and other arctic regions, there to perform the functions of incubation and nutrition in full security. They and their young quit their retreat in September, and dis¬ perse themselves over Europe. With us they make their appearance the beginning of October ; circulate first round our shores ; and, when compelled by severe frost, betake themselves to our lakes and rivers. 01 the web-footed fowl there are some of hardier consti¬ tutions than others : these endure the ordinary winters of the more northern countries ; but when the cold reigns there with more than common rigour, they repair for shelter to these kingdoms : this regulates the ap¬ pearance of some of the diver kind, as also of the wild swans, the sWallow-tailed shield duck, and the different sorts of goosanders winch then visit our coasts. Larenta found the barnacles with their nests in great numbers in Nova Zembla. (Collect. Roy. Dutch East~India Company, 8vo, 1703, p. 19.). Clusius, in his AToG 368. also observes, that the Dutch discovered them on the rocks of that country and in Waygate straits. They, as well as the other species of wild geese, go very far north to breed, as appears from the histories of Green¬ land and Spitzbergen, by Egede and Crantz. These birds seem to make Iceland a resting place, as Horre- bow observes : few continue there to breed, but only visit that island in the spring, and after a short stay re¬ tire still further north. 30. Corvorants. The corvorant and shag breed on most of our high rocks: the gannet in some ol the Scotch isles and on the coast of Kerry : the two first continue on our shores the whole year. The gannet disperses itself all round the seas of Great Britain, in pursuit of the herring and pilchard, and even as far as the Tagus to prey on the sardina. But ;i> ration S ;uments inst mi- i tion. MIG [8 But of the numerous species of fowl here enumerat¬ ed, it may be observed how very few intrust them¬ selves to us in the breeding season, and what a distant flight they make to perform the first great dictate ot na¬ ture. There seems to be scarcely any but what we have traced to Lapland, a country of lakes, rivers, swamps, and alps, covered with thick and gloomy forests, that afibrd shelter during summer to these fowls, which in winter disperse over the greatest part of Europe. In those arctic regions, by reason of the thickness of the woods, the ground remains moist and penetrable to the woodcocks, and other slender-billed fowl: and for the web-footed birds, the waters afford larvae innumerable of the tormenting gnat. The days there are long •, and the beautiful meteorous nights indulge them with every opportunity of collecting so minute a food : whilst man¬ kind is very sparingly scattered over that vast northern waste. Why then should Linnaeus, the great explorer of these rude deserts, be ama/.ed at the myriads of water- fowl that migrated with him out of Lapland ? which exceeded in multitude the army of Xerxes $ covering, for eight whole days and nights, the surface of the river Calix ! His partial observation as a botanist, would confine their food to the vegetable kingdom, almost denied to the Lapland waters $ inattentive to a more plenteous table of insect food, which the all-bountiful Creator had -spread for them in the wilderness. It may be remarked, that the lakes of mountainous rocky countries in general are destitute of plants : few or none are seen on those of Switzerland j and Linnaeus makes the same observation in respect to those of Lap- land *, having, during his whole tour, discovered only a single specimen of a lemma trisculca, or “ ivy-leaved duck’s meat,” Flora Lap. N° 470. •, a few of the scir- pus lacustris, or “ bulrush,” N° 18. •, the alopecurus geniculatus, or “ flote foxtail-grass,” N® 38.; and the ranunculus aquatilis, N° 234. j which are all he enu¬ merates in his Prolegomena to that excellent perform¬ ance. We shall afterwards state the principal arguments for and against the migration of swallows ; but here we shall give a short abstract of the arguments used by the Hon. Daines Barrington against the migration of birds in general, from a paper published by him in the 62d volume of the Philosophical Transactions. This gen¬ tleman denies that any well-attested instances can be produced of this supposed migration ; which, he thinks, if there were any such periodical flight, could not possi¬ bly have escaped the frequent observation of seamen. It has indeed been asserted that birds of passage become invisible in their flight, because they rise too high in the air to be perceived, and because they choose the night for their passage. The author, however, expresses his doubts “ whether any bird was ever seen to rise to a greater height than perhaps twice that of St Paul’s cross and he further endeavours to show, that the extent of some of these supposed migrations (from the northern parts of Europe, for instance, to the line) is too great to be accounted for, by having recourse to the argument founded on a nocturnal passage. The author next recites, in a chronological order, all the instances that he has been able to collect,' of birds having been actually seen by mariners when they Vol. XIV. Part I. t I ] MIG were crossing a large extent of sea j and he endeavours Migration, to show that no stress can be laid on the few casual1' observations of this kind that have been produced in support of the doctrine of a regular and periodical mi¬ gration. Mr Barrington afterwards proceeds to invalidate M. Adanson’s celebrated observation with respect to the migration of the swallow in particular, and which has been considered by many as perfectly decisive of the present question. He endeavours to show that the four swallows which that naturalist caught, on their settling upon his ship, on the 6th of October, at about the dis¬ tance of 50 leagues from the coast of Senegal, and which he supposes to have been then proceeding from Europe to pass the winter in Africa, could not be true European swallows j or, if they were, could not have been on their return from Europe to Africa. His ob¬ jections are founded principally on some proofs which he produces of M. Adanson’s want of accuracy on this subject, which has led him, in the present instance, to mistake two African species of the swallow tribe, de¬ scribed and engraved by Brisson, for European swallows, to which they bear a general resemblance j or grant¬ ing even that they were European swallows, he con¬ tends that they were flitting from the Cape de Verd islands to the coast of Africa; “ to which short flight, however, they were unequal, and accordingly fell into * NaUira* the sailors hands.”—We shall here only add, in oppo- History of sition to the remarks of Mr Barrington, the following observations of the Rev. Mr White* in a letter to Mr^1^1*' Pennant on this subject. 6 “ We must not (says he) deny migration in general ; Arguments because migration certainly does subsist in some places,111, .sllPPort as my brother in Andalusia has fully informed me. Of01 the motions of these birds he has ocular demonstration, for many weeks together, both spring and fall: during which periods myriads of the swallow kind traverse the Straits from north to south, and from south to north, according to the season. And these vast migrations consist not only of hiimndines, but of bee-birds, hoo¬ poes, oro pendolos or golden thrushes, &.c. &c. and also of many of our soft-billed summer birds of passage j and moreover of birds which never leave us, such as all the various sorts of hawks and kites. Old Belon, 200 years ago, gives a curious account of the incredible armies of hawks and kites which he saw in the spring time traversing the Thracian Bosphorus from Asia to Europe. Besides the above mentioned, he remarks that the procession is swelled by whole troops of eagles and vultures. “ Now it is no wonder that birds residing in Africa should retreat before the sun as it advances, and retire to milder regions, and especially birds of prey, whose blood being heated writh hot animal food, are more im¬ patient of a sultry climate : but then I cannot help wondering why kites and hawks, and such hardy birds as are known to defy all the severity of England, and even of Sweden and all northern Europe, should want to migrate from the south of Europe, and be dissatisfied with the winters of Andalusia. “ It does not appear to me that much stress may be laid on the difficulty and hazard that birds must run in their migrations, by reason of vast oceans, cross winds, &c. ; because, if we reflect, a bird may travel fr-om England to the equator without launching out and ex- L posing MIG [82 Migration, posing itself to boundless seas j and that by crossing the * —-y— '■' water at Dover and again at Gibraltar. And l with the more confidence advance this obvious remark, be¬ cause my brother has always found that some of his birds, and particularly the swallow kind, are very spa¬ ring of their pains in crossing the Mediterranean : for ■when arrived at Gibraltar, they do not, ] rang’d in figure, wedge their way, -“ and set forth “ Their airy caravan high over seas “ Flying, and over lands with mutual wing Easing their flight1 Milton. tiucstioii, What be¬ comes of hut scout and hurry along in little detached parties of six or seven in a company ; and sweeping low, just over the surface of the land and water, direct their course to the opposite continent at the narrowest passage they can find. They usually slope across the bay to the south¬ west, and so pass over opposite to Tangier, which it seems is the narrowest space. “ In former letters we have considered whether it was probable that woodcocks in moon-shiny nights cross the German ocean from Scandinavia. As a proof that birds of less speed may pass that sea, considerable as it is, I shall relate the following incident, which, though mentioned to have happened so many years ago, was strictly matter of fact:—As some people were shooting in the parish of Trotton, in the county of Sussex, they killed a duck in that dreadful winter 1708-9, with a silver collar about its neck (1 have read a like anecdote of a swan), on which were en¬ graven the arms of the king of Denmark. This anec¬ dote the rector of Trotton at that time has often told to a near relation of mine ; and, to the best of my re¬ membrance, the collar was in the possession of the rec¬ tor. “ At present I do not know any body near the sea side that will take the trouble to remark at what time of the moon woodcocks first come. One thing I used to observe when I was a sportsman, that there were times in which woodcocks were so sluggish and sleepy that they would drop again w'hen flushed just before the spaniels, nay, just at the muzzle of a gun that had been fired at them: whether this strange laziness was the effect of a recent fatiguing journey, I shall not pre¬ sume to say. “ Nightingales not only never reach Northumber¬ land and Scotland, but also, as I have been always told, Devonshire and Cornwall. In those two last counties wre cannot attribute the failure of them to the want of warmth : the defect in the west is rather a presumptive argument that these birds come over to us from the continent at the narrowest passage, and do not stimuli so far westward.” Upon the subject of the migration of the swallow there are three opinions. Some say that it migrates to ,1 • a warmer climate : some, that it retires to hollow trees swallows in . 7 . .. , . . winter? ant* caverns, where it lies in a torpid state } and others have affirmed, that it lies in the same state in the bot¬ tom of lakes and under the ice. The first opinion is supported by Marsigli, Kay, W illoughby, Catesby, Reaumur, Adanson, Bufl’on, &c. The first and second opinion are both adopted by Pennant and White. The third is sanctioned by Schaeffer, Hevelius, Derham, Klein, Ellis, Linnaeus, Kalm : and the second and MIG third have been strongly defended by the honourable Migotld Daines Barrington. ^ 'j Though we cannot help giving a preference to that opinion which appears the most probable, yet we do not think that any one of them is established upon such evi¬ dence as so curious a subject requires, and as the advan¬ ced state of natural history would lead us to expect. We shall therefore state the arguments upon which each opinion is founded as fairly and distinctly as we can, and as often as possible in the very words of their re¬ spective advocates. By doing so, we shall place the whole subject before the eyes of our readers, who will thus have an opportunity of examining it attentively, and of making such observations and experiments as may lead to the truth. g Those who assert that the swallow migrates to a war- First oy mer country in winter, argue in this manner: Tim' monst;.-# many birds migrate, is a fact fully proved by the ob-er- ‘ tiu‘ vations of natural historians. Is it not more probable, ' therefore, that swallows, which disappear regularly mates. every season, retire to some other country, than that they lie in a state of torpor in caverns or lakes ? But this opinion does not rest on probability, it is founded on facts. We often see them collected in great flocks on chur¬ ches, rocks, and trees, about the time when they an¬ nually disappear. The direction of their flight has been observed to be southward. Mr White, the ingenious historian of Selborne, travelling near the coast of the British Channel one morning early, saw a flock ofp swallows take their departure. At the beginning of his journey he was environed with a thick fog •, but on a large wild heath the mist began to break, and discover¬ ed to him numberless swallows, clustered on the stand¬ ing bushes, as if they had roosted there : as soon as the sun burst out, they were instantly on wing, and with an easy and placid flight proceeded towards the sea. After this he saw no more flocks, only now and then a straggler. Mr Laskey of Exeter observed attentively the direc¬ tion which a flock of swallows took in the autumn of 1793. On the 22d of Sept, about seven o’clock in the morning, the wind being easterly, accompanied with a cold drizzling rain, Mr Laskey’s house was entirely covered with house-sw’allows. At intervals large flocks arrived and joined the main body, and at their ar¬ rival an unusual chirping commenced. The appear¬ ance of the whole company was so lethargic, that he found it an easy matter to catch a considerable numberM | of them, which he kept in a room all that day. heating the room they all revived : he opened four of them, and found their stomachs quite full. The main body occupied the house top all day, except for two hours. About halt an hour after nine in the morning of the 23d, there was a great commotion, with very loud chirping, and within a few minutes after, the whole multitude took their flight, in a direct south-east direction, having ascended to a great height in the at¬ mosphere. He let go the birds wh.ch he had caught, at certain intervals till four o’clock, and they all flew toward the same quarter. Not only has the direction of their flight been obser¬ ved, but they have also been found on their passage at a great distance from land. Mr Adanson informs us, that about 50 leagues from the coast of Senegal four swallows settled upon the ship on the 6th of October j that MIG [ 83 J MIG Lotation that those birds were taken j and that he knew them to < be European swallows, which, he conjectures, were returning to the coast of Africa. Sir Charles Wager’s lUosophi authority may also be appealed to : “ Returning homo ; Trans, (says he) in the spring of the year, as I came into 'ions, soundings in our channel, a great flock of swallows '• hd- came and settled on all my rigging j every rope was covered, they hung on one another like a swarm of bees j the decks and carving were filled with them. They seemed almost famished and spent, and were only feathers and bones ; but, being recruited with a night’s rest, took their flight in the morning.” This vast fa¬ tigue proves that their journey must have been very great, considering the amazing swiftness of these birds : in all probability they had crossed the Atlantic ocean, and were returning from the shores of Senegal, or other parts of Africa ; so that this account from that most able and honest seaman, confirms the later information of Mr Adanson. Mr Kalm, who is an advocate for the opinion that swallows lie immersed in lakes during winter, acknow¬ ledges that in crossing the Atlantic from Europe a swallow lighted on the ship on the 2d September, when ■aim's it had passed only two-thirds of the ocean. Since, oyage, therefore, swallows have been seen assembled in great '!• i- P'^-flocks in autumn flying off in company towards southern climes, since they have been found both in their passage : condopi- 1 3n that .ne lie I caverns a torpid te. nnant's ■itish )ologv, 1. ii, 25°* from Europe and returning again, can there be any doubt of their annual migration?—Mr Barrington’s objections to this opinion have been noticed above in Nb 5. The second notion (says Mr Pennant) has great anti¬ quity on its side. Aristotle and Pliny give it as their belief, that swallows do not remove very far from their summer habitation, but winter in the hollows of rocks, and during that time lose their feathers. The former part of their opinion has been adopted by several inge¬ nious men ; and of late several proofs have been brought of some species, at least, having been discovered in a torpid state. Mr Collinson favoured us with the evi¬ dence of three gentlemen, eye-witnesses to numbers of sand martins being drawn out ot a cliff on the Rhine, in the month of March 1762. And the honourable Daines Barrington communicated to us the following fact, on the authority of Lord Belhaven, That numbers of swallows have been found in old dry walls and in sand-hills near his Lordship’s seat in East Lothian ; not once only, but from year to year j and that when they were exposed to the warmth of a fire, they revived. We have also heard of the same annual discoveries near Morpeth in Northumberland, but cannot speak of them with the same assurance as the two former : neither in the two last instances are we certain of the particular species. “ Other witnesses crowd on us to prove the residence of those birds in a torpid state during the severe season. First, in the chalky cliffs of Sussex *, as was seen on the fall of a great fragment some years ago. Secondly, In a decayed hollow tree that was cut down, near Dolgel- ii, in Merionethshire. Thirdly, In a cliff near Whitby, Yorkshire j where, on digging out a fox, whole bushels of swallows were found in a torpid condition. And, lastly, The reverend Air Conway of Sychton, I lint- shire, was so obliging as to communicate the following fact: A few years ago, on looking down an old lead- mine in that county, he observed numbers of swallows Migration. clinging to the timbers of the shaft, seemingly, asleep ;' v— and on flinging some gravel on them, they just moved, but never attempted to fly or-change their place : this Avas between All Saints and Christmas. “ These are doubtless the lurking places of the later hatches, or of those young birds which are incapable ot distant migrations. There they continue insensible and rigid j hut like flies may sometimes he reanimated' by an unseasonable hot day in the midst of winter : lor very near Christmas a few appeared on the moulding ot a window of Merton college, Oxford, in a remarkably warm nook, which prematurely set their blood in mo¬ tion, having the same effect as laying them before a fire at the same time of year. Others have been known to make this premature appearance ■, but as soon as the cold natural to the season returns, they withdraw again to their former retreats. “ The above are circumstances we cannot but assent to, though seemingly contradictory to the common course, of nature in regard to other bii’ds. We must, therefore, divide our belief relating to these two so different opi¬ nions $ and conclude, that one part of the swallow tribe migrate, and that others have their winter quarters near home. If it should he demanded, why swallows alone are found in a torpid state, and not the other many species of soft-billed birds, which likewise dis¬ appear about the same time ? reasons might be assign¬ ed.” 4 10 The third opinion we shall state and support in the Third opw words of Air Kalm. “ Natural history (says he), asni°n, that all other histories, depends not always upon the intrin-?”^b^ sic degree of probability, but upon facts founded on thein water, testimony of people of noted .veracity.—Swallows are seldom seen sinking down into water j swallows have not such organs as frogs or lizards, which are torpid during winter $ ergo, swallows live not, and cannot live, under water'.—This way of arguing, I believe, would carry us, in a great many cases, too far : for though it is not clear to every one, it may however be true j and lizards and frogs are animals of a class widely different from that of birds, and must therefore of course have a different structure ; hence it is they arc classed separately. The bear and marmot are in winter in a torpid state, and have, however, not such organs as lizards and frogs; and nobody doubts of their being, during some time, in the most rigid climates, in a tor¬ pid state : for the Alpine nations hunt the marmots frequently by digging their holes up; and find them so torpid, that they cut their throats, without their reviv¬ ing or giving the least sign of life during the operation; but when the torpid marmot is brought into a warm room, and placed before the fire, it revives from its lethargy. The question must therefore be decided by facts , nor are these wanting here. Dr AYallerius, the celebrated Swedish chemist, informs us, That he has seen, more than once, swallows assembling on a reed, till they were all immersed and went to the bottom ; this being preceded by a dirge of a quarter of an hour’s length. He attests likewise, that he had seen a swallow caught during winter out of a lake with a net, drawn, as is common in northern countries, under the ice; this bird was brought into a warm room, revived, fluttered about, and soon after died. “ Air Klein applied to many farraers-general of the L 2 king M I G [ «4 J M I G Migration, king of Prussia’s domains, who had great lakes in their 1 “v districts, the fishery in them being a part ot the revenue. In winter the fishery thereon is the most considerable under the ice, with nets spreading more than 200 or 300 fathoms, and they are often wound by screws and engines on account of their weight. All the people that were questioned made affidavits upon oath betore the magistrates. First, The mother of the countess Lehndorf said, that she had seen a bundle of swallows brought from the Fnshe-Haff ^a lake communicating with the Baltic at Pillaw), which, when brought into a moderately warm room, revived and fluttered about. Secondly, Count Schileben gave an instrument on stamped paper, importing, that by fishing on the lake belonging to his estate of Gerdauen in winter, he saw several swallows caught in the net, one of which he took up in his hand, brought it into a warm room, where it lay about an hour, when it began to stir, and half an hour after, it flew about in the room. Thirdly, Farmer-general (Amtman) Witkouski made affidavit, that, in the year 1740, three swallows were brought up with the net in the great pond at Didlacken j in the year 1741, he got two swallows from another part of the pond, and took them home (they being all caught in his presence) 5 after an hour’s space they revived all in a warm room, fluttered about, and died in tlnee hours after. Fourthly, Amtman Bonke says, that having had the estate of Kleskow in farm, he had seen nine swallows brought up in the net from under the ice, all which he took into a warm room, where he distinct¬ ly observed how they gradually revived j but a few hours after they all died. Another time his people got likewise some swallows in a net, but he ordered them to be again thrown into the water. Fifthly, Andrew Rutta, a master fisherman at Oletsko, made affidavit, in 1747, that 22 years ago, two swallows were taken up by him in a net, under the ice, and, being brought into a warm room, they flew about. Sixthly, Jacob Kosiulo, a master fisherman at Stradauen made affidavit, that, in 1736, he brought up in winter, in a, net, from under the ice of the lake at Raski, a seemingly dead swallow, which revived in half an hour’s time in a warm room; and he saw, in a quarter of an hour alter, the bird grow weaker, and soon after dying. Seventh¬ ly, I can reckon myself (says our author) among the eye-witnesses of this paradox of natural history. In the year 1735, being a little boy, I saw several swallows brought in winter by the fishermen from the river Vistula to my father’s house; where two of them were brought into a warm room, revived, and flew about. I saw them several times settling on the warm stove (which the northern nations have in their rooms); and t recollect well, that the same forenoon they died, and I had them, when dead, in my hand. In the year 1754, after the death of my uncle Godefroy VVolf, captain in the Polish regiment of foot guards, being myself one of his heirs, I administered for my co-heirs several estates called the Starosty oj'Dischau, in Polish Prussia, which my late uncle farmed under the king. In January, the lake of Lybshaw, belonging to these estates, being covered with ice, I ordered the fishermen to fish therein, and in my presence several swallows were taken, which the fishermen threw in again ; but one I took up myself, brought it home, which was five miles from thence, and it revived, but died about an Migmid hour after its reviving. v*' “ These are facts attested hy people of the highest quality, by some in public offices, and by others who, though of a low rank, however, made these affidavits upon oath. It is impossible to suppose indiscriminately that they were prompted, by views of interest, to assert as a fact a thing which had no truth in it. It is there¬ fore highly probable, or rather incontestably true, that swallows retire in the northern countries, during winter, into the water, and stay there in a torpid state till the return of warmth revives them again in spring. The question therefore, I believe, ought for the future to be thus stated : The swallows in Spain, Italy, France, and perhaps some from England, remove' to warmer climates ; some English ones, and some in Germany and other mild countries, retire into clefts and holes in rocks, and remain there in a torpid state. In the cold¬ er northern countries the swallows immerse in the sea, in lakes, and rivers ; and remain in a torpid state, under ice, during winter. There are still some objec¬ tions to this latter assertion, which we must remove. It is said, Why do not rapacious fish, and aquatic qua¬ drupeds and birds, devour these swallows ? The answer is obvious, swallows choose only such places in the water for their winter retreat as are near reeds and rushes ; so that sinking down there between them and their roots, they are by them secured against the rapa¬ ciousness of their enemies. But others object, Why are not these birds caught in such fresh waters as are con¬ tinually harassed by nets ? I believe the same answer which has been made to the first objection will serve for this likewise. Fishermen take care to keep oil' with their nets from places filled with reeds and rushes, for fear of entangling and tearing their net; and thus the situation of swallows under water, is the reason that they are seldom disturbed in their silent winter retreats. What confirms this opinion still more is, that swallows were never caught in Prussia according to the above- mentioned affidavits, but with those parts of the net which passed near to the reeds and rushes ; and some¬ times the swallows were yet fastened with their feet to a reed, when they were drawn up by the net. As to the argument taken from their being so long under water without corruption, I believe there is a real difference between animals suffocated in wrater and animals being torpid therein. We have examples of things being a long time under water ; to which we may add the intense cold of these northern regions, which preserves them. Who would have thought that snails and polypes might be dissected, and could repro¬ duce the parts severed from their bodies, if it was not a fact ? Natural history ought to be studied as a collec¬ tion of facts, not as the history of our guesses or opi¬ nions. Nature varies in an infinite manner ; and Pro¬ vidence has diversified the instinct of animals and their economy, and adapted it to the various seasons and climates.” „ With Mr Kahn’s concluding observations we hearti- This quo ly concur. Natural history ought to be studied as a tion pughj collection of facts; and it was from this very notiont0 be.^e: that we have stated the above-mentioned opinions so fully, and brought together the facts which the best s01,ing, bj advocates for each opinion have judged most proper for by experi supporting Migration :ntle- an’s Ma- izine, ty n96' 12 Ir Hun- r's expe- nent in- nious: 13 t not cisive th re- ?ct to 1 them mates. MIG [ supporting them. We are sensible of the great impro¬ bability of the third opinion, and know that many ar¬ guments have been used to prove its absurdity: such as these, The swallow is lighter than water, and therefore cannot sink 5 if it moults at all, it must moult under water during its torpid state, which is very improbable j there is no instance of land animals living so long un¬ der water without respiration. Many other arguments of the same sort have been advanced, and certainly af¬ ford a short way of deciding the question ; but unless they were sufficient to prove the immersion of swallows a physical impossibility, they are of no force when op¬ posed to the evidence of testimony, if there be no cause to suspect the witnesses of inaccuracy or design. The true way to refute such an opinion is by accurate obser¬ vation and experiment. We have not heard of any ac¬ curate inquiries being made by philosophers in those northern countries where swallows are said to pass the winter under w'ater. The count de Buft’on, indeed, shut up some swallows in an ice-house by way of experi¬ ment, which died in a few days; but as he does not tell us what precautions he took to make the experiment succeed, it is not entitled to any attention. Mr John Hunter made a very judicious experi¬ ment on the banks of the Thames, which is describ¬ ed by a correspondent in the Gentleman’s Maga¬ zine, who asserts that he had it from Mr Hunter him¬ self. One year in the month of September, he prepared a room, with every accommodation and convenience which he could contrive, to serve as a dormitory for swallows, if they were disposed to sleep in winter. He placed in the centre a large tub of water with twigs and reeds, &c. which reached to the bottom. In the corners of the room he contrived artificial caverns and holes, into which they might retire 5 and he laid on the floor, or suspended in the air, different lengths of old wooden pipes, which had formerly been employed in conveying water through the streets, See. When the receptacle was rendered as complete as possible, he then engaged some watermen to take by night a large quantity of the swallows that hang upon the reeds in the Thames about the time of their depar¬ ture. They brought him, in a hamper, a considerable number j and had so nicely hit the time of their cap¬ ture, that on the very day following there were none to be seen. He put the swallows into the room so prepared, where they continued to fly about, and occasionally perch on the twigs, Sic. But not one ever retired into the water, the caverns, holes, or wooden pipes, or shewed the least disposition to grow torpid, Sic. In this situa¬ tion he let them remain till they all died but one. This appearing to retain some vigour, was set at liber¬ ty when it mounted out of sight, and flew away. All the birds lay dead scattered about the room ; but not one was found asleep or torpid, or had, if the corres¬ pondent remembers, so much as crept into any of the receptacles he had so provided. This experiment was ingenious, and certainly does render the doctrine of immersion much more improba¬ ble ; but it is not decisive 5 for it may still be urged by the advocates for that doctrine, as Mr Kalm has done, that it may only be in the colder countries where swallows retire into the water. We formerly said that 85 J M 1 G none of the three opinions is supported by such evi- Migration, dence as to satisfy the mind completely. Opinions *-•—v— respecting events which happen every year ought to be confirmed by a great number of observations, and not by a few instances divested of almost all their con¬ comitant circumstances. Can no better proofs be brought to prove the migration of swallows than those of Adanson and Sir Charier Wager, or the circumstan¬ ces mentioned by Mr White and Mr Taskey respecting their disappearing ? We ought not merely to know that some swallows have taken a southerly flight in autumn, that some have been found at a great distance from land in the spring, or in harvest; but we ought to know to what countries they actually retire. Before we can rest satisfied, too, that it is a general fact that swallows remain in a torpid state during winter, either in ca¬ verns or in the bottom of lakes, &c. w’e must have more proofs j we must know what species of swallows they are said to be, in what countries this event takes place, and several other circumstances of the same kind. We cannot help being of opinion that much remains Many to be done in order properly to ascertain what becomes thins8 yet of the swallows in Europe during winter. It would be ’emain h0 • 10 done in necessary, in the first place, to know accurately what order to are the countries in which swallows are found. 2. Ho determine they remain visible the whole year P or, if they disap-this point, pear, at what season does this- happen, and when do they appear again ? 3. Ho they ever appear while a strong north wind blows, or do they only come in great numbers with a south wind ? We will endeavour to answer some of these questions in part; but must re¬ gret, that all the information on this subject which we have been able to cull from the best writers in natural history is very scanty j and we merely give it by way of specimen, hoping that future observations will render it more complete. 1 - There are five species which visit Britain during the A few im- summer months ; the common or chimney swallow, the Portant martin, sand martin, swift, and goat-sucker, j facts chimney swallow frequents almost every part of the old continent; being known (says Hr Latham) from Norway to the Cape of Good Hope on the one side, and from Kamtschatka to India and Japan on the other. It is also found in all parts of North America, and in several of the West Indian islands. In Europe it dis¬ appears during the winter months. It appears general¬ ly a little after the vernal equinox ; but rather earlier in the southern, and later in the northern latitudes. It adheres to the usual seasons with much regularity ; for though the months of February and March should be uncommonly mild, and April and May remarkably cold, it never deviates from its ordinary time. In the cold spring of 1740 some appeared in France before the insects on which they feed had become numerous enough to support them, and great numbers died f. f Buff'o/i's In the mild and even warm spring of 1774 they ap- ^aturul peared no earlier than usual. They remain in some° warm countries the whole year. Kolben assures usvol. vi. that this is the case at the Cape of Good Hope; butp- S27- (he says) they are more numerous in winter. Some birds of this species live, during winter, even in Eu¬ rope ; for example on the coast of Genoa, where they spend the night in the open country on the orange shrubs. 2. The MIG [86 Migiatisu. 2. The martins are also widely diffused through the u——V“—' old continent; but the countries where they reside or visit have not been marked by naturalists with much attention. 3. The sand martins are found in every part t Ibid. 527. of Europe, and frequently spend the winter in Malta Two birds of this species wrere seen in Perigord in France, on the 27th December 1775, when there was jj 484.a southerly wind, attended with a little rain ||. 4. The swift visits the whole continent of Europe •, has also been observed at the Cape of Good Hope, and in Ca¬ rolina in North America. , The goat suckers are not very common birds, yet are widely scattered. They are found in every country between Sweden and Afri¬ ca : they are found also in India. In April the south¬ west wind brings them to Malta, and in autumn they repass in great numbers. Trunsac- Mr Markwick of Catsfield, near Battle in Sussex, tiomofthe |ias drawn up an accurate table, expressing the day of ^nr?pt!!>l ^ie month on which the birds, commonly called migra¬ tory, appeared in spring, and disappeared in autumn, for 16 years, from 1768 to 1783 inclusive. The ob¬ servations were made at Catsfield. From this table we shall extract the dates for five years, and add the very few observations which we have been able to collect re¬ specting the time when the swallow appears and disap¬ pears in other countries. Society, vol. i. Chimney Swallow Martins Sand Martin Swift Chimney Swallow Martins Sand Martin Swift Chimney Swallow Martins Sand Martin Swift Chimney Swallow Martins Sand Martin Swift Chimney Swallow Martins Sand Martin Swift First seen, 1779. April 14. I4- May 7. 9- 1780. April 29. 8. May 6. 1781. April 8. May 1 2. April 26. May 12. 1782. April 22. 26. May 15. 18. April 1 3. May 1. July 25. May 13. Last seen. October 29. I5* November 3. 3- September 8. 8. October 15. September 7. September 1. 1. September 1. November 2. August 28. 28. November 6. 6. September 1. November 6. Cluai. Swal. Swifts Martins. Appear about Ap. 9. Ap 24. Ap 30. S Mart. Ap. 12. f Buff on, In Burgundy f ibid In Selborne, Hampshire | Ap. 4. f White s In South Zele, Devonshire [ 25.' May 1. May Natural In Blackburn, Lane a-hi re ; 29. Ap. 28. History of In Upsal in Sweden § May 9. Selborne. Were tables of the same kind made in every different country, particularly within the torrid zone, it would be easy to determine the question which we have been considering. To many, perhips, it may not appear a matter of such importance as to be worth the labour. 4 § Buffon, ibid. ] ,M I G We acknowledge it to be rather a curious than an im- Migration, portant inquiryyet it is one which must be highly Miguel, gratifying to every mind that can admire the wisdom of the Great Architect of nature. The instinct of the swallow is indeed wonderful: it appears among us just at the time when insects become numerous j and it con¬ tinues with us during the hot weather, in order to pre¬ vent them from multiplying too much. It disappears when these insects are no longer troublesome. It-is ne¬ ver found in solitude ; it is the friend of man, and al¬ ways takes up its residence with us, that it may pro¬ tect our houses and our streets from being annoyed with swarms of flies. Migration of Fishes. See Clupea. St MIGUEL, or St Michael, one of the Azorc islands, situated in W. Long. 25. 45. N. Lat. 38. 10. This island appears to be entirely volcanic. The best account we have of it hath been published in the 68th volume of the Philosophical Transactions by Mr Fran¬ cis Masson. According to him, the productions differ greatly from those of Madeira, insomuch that none of the trees of the latter are found here, except the faya : it has a nearer affinity to Europe than Africa The mountains are covered with the erica vulgaris, and an elegant evergreen shrub very like a pbillyrea, which gives them a most beautiful appearance. It is one of the principal and most fertile of the Azo¬ rian islands, lying nearly east and west. Its length is about 18 or 20 leagues ; its breadth unequal, not ex¬ ceeding five leagues, and in some places not more than two. It contains about 80,^00 inhabitants. Its capital, the city of Ponta del Guda, which con¬ tains about 12,000 inhabitants, is situated on the south side of the island, on a fine fertile plain country, pretty regularly built 5 the streets straight, and of a good breadth. It is supplied with good water, which is brought about the distance of three leagues from the neighbouring mountains. The churches and other religious edifices ai-e elegant and well built for such an island. There is a large convent of Franciscan friars and one of the order of St Augustine, four convents for professed nuns, and three Ricolhimentos for young women and widows who are not professed. The ves¬ sels anchor in an open road ; but it is not dangerous, as no wind can prevent their going to sea in case of stormy weather. The country round the city is plain for several miles, well cultivated, and laid out with good taste in¬ to spacious fields, which are sown with wheat, barley, Indian corn, pulse, &c. and commonly produce an¬ nually two crops ; for as soon as one is taken off, an¬ other is immediately sown in its place. The soil is remarkably gentle and easy to work, being for the most part composed of pulverized pumice stone. There are in the plains a number of pleasant count!y seats, with orchards of orange trees, wdiich are esteemed the best in Europe. The second town is Ribeira Grande, situated on the north side of the island, containing about as many inha¬ bitants as the city 5 a large convent of Franciscan friars, and one of nuns. It gives title to a count, cal¬ led the Conde Ribeira Grande, who first instituted linen and woollen manufactories in the island. The third town is Villa Franca, on the south side of the island, about six leagues east of Ponta del Guda. It MIG L 87 ] MIG It has a convent of Franciscan friars and one of nuns, which contains about 300. Here, about half a mile from the shore, lies a small island (Ilhao), which is hollow in the middle, and contains a fine bason with only one entrance into it, fit to hold 50 sail of vessels secure from all weather ; at present it wants cleaning out, as the winter rain washes down great quantities of earth into it, which has greatly diminished its depth. But vessels frequently anchor between this island and the main. Besides these towns are several smaller, viz. Alagao, Agoa de Pao, Brelanha, Fanaes de Ajuda, and a num¬ ber of hamlets, called h/gars or places. About four leagues north-east from Villa Franca, lies a place called the Furnas, being a round deep valley in the middle of the east part of the island, surrounded with high mountains, which, though steep, may be easily ascended on horseback, by two roads. The valley is about five or six leagues in circuit. The face of the mountains, which are very steep, is entirely co¬ vered with beautiful evergreens, viz. myrtles, laurels, a large species of bilberry called uva de serra, &c. and numberless rivulets of the purest water run down their sides. The valley below is well cultivated, producing Wheat, Indian corn, flax, Stc. The fields are planted round with a beautiful sort of poplars, which grow into pyramidal forms, and by their careless in-egular disposi¬ tion, together with multitude of rivulets, which run in all directions through the valley, a number of boil¬ ing fountains throwing up clouds of steam, a fine lake in the south-west part about two leagues round, compose a prospect the finest that can be imagined. In the bot¬ tom of the valley the roads are smoot h and easy, there being no rocks, but a fine pulverized pumice stone that the earth is composed of. There are numerous hot fountains in different parts of the valley, and also on the sides of the moun¬ tains : but the most remarkable is that called the c/?al- deira, situated in the eastern part of the valley, on a small eminence by the side of a river, on which is a bason about 30 feet diameter, where the water conti¬ nually boils with prodigious fury. A few yards di¬ stant from it is a cavern in the side of the bank, in which the water boils in a dreadful manner, throwing out a thick, muddy, unctuous water, several yards from its mouth with a hideous noise. In the middle of the river are several places where the water boils up so hot, that a person cannot dip his finger into it without being scalded 5 also along its banks are several apertures, out of which the steam rises to a considerable height, so hot that there is no approaching it with one’s hand : in other places, a person would think that too smiths bellows were blowing altogether, and sulphureous steams issuing out in thousands of places; so that na¬ tive sulphur is found in every chink, and the ground covered with it like hoar frost ; even the hushes that happen to lie near these places are covered with pure brimstone, condensing from the steam that issues out of the ground, which in many places is covered over with a substance like burnt alum. In these small ca¬ verns from which the steam issues, the people often boil their yams. Near these boiling fountains are several mineral springs ; two in particular, whose waters have a very strong quality, of an acid taste, and bitter to the tongue. About half a mile to the westward, and close by the river side, are several hot springs, which are used by sick people with great success. Also, on the side of a hill west of St Anne’s church, are many others, with three bathing houses, which are most commonly used. These waters are very warm, although not boiling hot ; but at the same place issue several streams of cold mine¬ ral water, by which they are tempered, according to every one’s liking. About a mile south of this place, and over a low ridge of hills lies a fine lake about two leagues in cir¬ cumference, and very deep, the water thick, and of a greenish colour. At the north end is a plain piece of ground, where the sulphureous steams issue out in many places, attended with a surprising blowing noise. Our author could observe strong springs in the lake, but could not determine whether they were hot or cold : this lake seems to have no visible evacuation The other springs immediately form a considerable river, called. Ribeira Quente, which runs a course about two or three leagues, through a deep rent in the mountains, on each side of which are several places where the smoke issues out. It discharges itself into the sea on the south side, near which are some places where the water boils up at some distance in the sea. This wonderful place had been taken little notice of until very lately : so little curiosity had the gentle¬ men of the island, that scarcely any of them had seen it, until of late some persons, afflicted with very viru¬ lent disorders, were persuaded to try its waters, and found immediate relief from them. Since that time it has become more and more frequented; several per¬ sons who had lost the use of their limbs by the dead palsy have been cured •, and also others who were troubled with eruptions on their bodies. A clergyman, who was greatly afflicted with the gout, tried the said waters, ami was in a short time per¬ fectly cured, and has had no return of it since. AYhen Mr Masson was there, several old gentlemen, who were quite worn out with the said disorder, were using the waters, and had rceived incredible benefit from them; in particular, an old gentleman about 60 years of age, who had been tormented with that disorder more than 20 years, and often confined to his bed for six months together: he had used these waters for about three weeks, had quite recovered the use of his limbs, and walked about in the greatest spirits imaginable. A friar also who bad been troubled with the said disorder about 12 years and reduced to a cripple, by using them a short time was quite well, and went a-hunting every day. 1'here are several other hot springs in the island, particularly at Ribeira Grand ; but they do not pos¬ sess the same virtues, at least not in so great a de¬ gree. The east and west part of the island rises into high mountains', but the middle is low, interspersed with round conic hills, all of which have very recent marks of fire *, all the parts below the surface consisting of melted lava lying very hollow. Most of the mountains to the westward have their tops hollowed out like a punch bowl, and contain wa¬ ter. Miguel, Milan. MIL [ 88 ] ter. Near the west end is an immense deep valley like the Furnas, called the Sete Cidades. 'I bis valley ' is surrounded with very abrupt mountains, about se\ en or eight leagues round j in the bottom is a deep lake of water about three leagues in circuit, furnished with great numbers of water fowls. Ibis water has no mineral quality j neither are there any hot springs in the valley. All these mountains are composed of a white crumbly pumice stone, which is so loose, that if a person thrust a stick into the banks, whole wag¬ gon loads of it will tumble down. The inhabitants of the island relate a story, that he who first discovered it observed an extraordinary high peak near the west end} but the second time he visited it, no such peak was to be seen, which he supposed must have certainly sunk j but, however improbable this story may be, at some period or other it must have certainly been the case. See Azores, Supplement. MILAN, or the duchy of the Milanese, a coun¬ try of Italy, bounded on the west by Savoy, Pied¬ mont, and Montferrat j by Switzerland on the north j by the territories of Venice, the duchies of Mantua, Parma, and Placentia on the east 5 and by the ter¬ ritories of Genoa on the south. It is 150 miles long, and 78 broad. ... Anciently this duchy, containing the north part of the old Liguria, was called Insubria, from its inhabitants the Insubres; who were conquered by the Romans, as these were by the Goths-, who in their turn were subdued by the Lombards. . Di- dier, the last king of the Lombards, was taken prisoner by Charlemagne, who put an end to the Longobardic empire, and appointed governors of Milan. These go¬ vernors being at a distance from their masters, soon began to assume an independency, which brought a dreadful calamity on the country j for, in 1152, the capital itself was levelled with the ground by the em¬ peror Frederic Barbarossa, who committed great de¬ vastations otherwise throughout the duchy. Undei this emperor lived one Galvian, a nobleman who was descended from Otho a Milanese. Galvian, along with William prince of Montferrat, served m the crusade, when Godfrey of Boulogne took Jerusalem . he killed in single combat the Saracen general, whom he stripped of his helmet, which was adorned with the image of a serpent swrallowing a youth ; and this ever afterwards was the badge of that family. His giand- son Galvian, having opposed the emperor, was taken prisoner, and carried in irons into Germany, from whence he made his escape, and returning to Milan, died in the service of his country. From him descend¬ ed another Otho, at the time that Otho IV. was em¬ peror of Germany, and who soon distinguished him¬ self by the accomplishments both of his mind and bo¬ dy. When he grew up, he was received into the family of Cardinal Octavian Ubaldini at Rome. This prelate, who was himself aspiring at the popedom, was in a short time greatly taken with the address and accomplishments of young Otho, and predicted his future greatness. In the mean time, one Torres, or Torriano, a Milanese nobleman of unbounded ambi¬ tion, was attempting to make himself master of Mi¬ lan/ The popular faction had some time before been caballing against the nobility j and at last, Torriano putting himself at their head, expelled the bishop, and M I L put to death or banished all the nobility ; by which Miter.. means the popular government was fully established ;-y— and Torriano, under this pretence, ruled every thing as he pleased. He was, however, soon opposed by one Francisco Scpri, who formed a great party, pre¬ tending to deliver the city from Torriano’s haughti¬ ness a'nd cruelty. But while the two parties were collecting their forces against each other, Caidinal Ubaldini was projecting the destruction of both, by means of his favourite Otho. This prelate had for some time borne an implacable fiatied to Xomano, because he had been by him prevented from carrying out of the treasury of St Ambrose’s church at Mi¬ lan, a carbuncle or jewel of great value, which he pre¬ tended to reserve for adorning the papal tiara j for which reason he now determined to oppose his ambition. Ubaldini began with naming Otho archbishop of Milan -, which, as the pope’s legate, he had a right to do. This nomination was confirmed by Pope Ur¬ ban IV. j and the party of the nobility having now got a head from the pope himself, began to gather strength. Otho in the mean time employed himself in collecting troops ; and had no sooner procured a show of an army than he advanced towards Lago Mag- giore, and took possession of Arena, a strong post near that lake: but Torriano, marching immediately against him with all his troops, obliged him to aban¬ don the place, and leave his party to make the best terms they could with the conqueror. This was fol¬ lowed by the destruction of the castles of Arona, Ano-hiari, and Brebia: soon after which Torriano died, and was succeeded by his brother Philip, who had sufficient interest to get himself elected podesta, or praetor of Milan, for ten years. During his lifetime, however, the party of the nobility increased consider¬ ably under Otho, notwithstanding the check they had received. Philip died in 1265, having lost ground con¬ siderably in the aftections of the people, though he ob¬ tained a great reputation for his courage and conduct. His successor Napi rendered himself terrible to the nobility, whom he proscribed, and put to death as of¬ ten as he could get them into his power. He pro¬ ceeded such lengths, and acted with such fury against that unfortunate party, that Pope Clement IV. who had succeeded Urban, at last interdicted Milan, and excommunicated Napi and all his party. By this Napi began to lose his popularity, and the public dis¬ affection towards him was much heightened by the natural cruelty of his temper. But in the mean time, the party of the nobility was in the utmost distress. Otho himself and his friends, having spent all their substance, wandered about from place to place 5 the pope not being in a capacity of giving them any as¬ sistance. Otho, however, was not discouraged by his bad success, but found means still to keep up the spirits of his party, who now chose for their general Squar- cini Burii, a man of great eminence and courage, whose daughter was married to Matthew Visconti, afterwards called Matthew the Great. At the same time they re¬ newed their confederacy with the marquis of Mont¬ ferrat, who was son-in-law to the king of Spain. Ihe marquis agreed to this confederacy chiefly with a view to become master of the Milanese. The nobility now again began to make head j anil having collected an army, which was joined by 600 Snanish MIL [ 89 ] MIL Spanish cavalry and a body of foot, gained some ad¬ vantages. But in the mean time Napi, having gather¬ ed together a superior army, suddenly attacked Otho and Burri, and defeated them. After this disaster Otho applied to the pope ; from whom, however, he did not obtain the assistance he desired ; and in the mean time Napi invited the emperor Rodolph into Italy, with the promise of being crowned at Milan. This invitation was accepted of with great readiness by Rodolph j who constituted Napi his governor and vicar-general in Lombardy, sending to him at the same time a fine body of German horse, the command of which was given to Cassoni, Napi’s nephew. On this Otho again applied to the pope (Gregory X.) but he was so far from granting him any assistance, that he is said to have entered into a scheme of assassinating him privately } hut Otho escaped the danger, and in 1276 began to recover his affairs. The reason of Pope Gre¬ gory’s enmity to him was, that he and his party were thought to be Gibelines, and were opposed by great numbers of the nobility themselves j but after that pope’s death, the Milanese exiles being united under one head, soon became formidable. They now chose for their general Godfrey count of Langusio, a noble Pa- vian, and an inveterate enemy of the Torriano family. This nobleman being rich and powerful, enlisted many German and other mercenaries, at whose head he mar¬ ched towards the Lago Maggiore. All the towns in that country opened their gates to him, through the in¬ terest of the Visconti family, who resided in these parts. But this success soon met with a severe check in an un¬ fortunate engagement, where Godfrey was defeated and taken pi'isoner ; after which he and 34 nobles had their heads struck otf, and sent from the field of battle piled up in a common waggon. This defeat greatly affected Otho j but having in a short time recovered himself, he again attacked his enemies, and defeated them j but, suffering his troops to grow remiss after their victory, the fugitives rallied, and entirely defeated him. The next year, however, Otho had better success, and totally defeated and took prisoner Napi himself. After this victory Cassoni was obliged to abandon Milan to his competitor, who kept possession of it till his death, which happened in 1295, in the 87th year of his age. Otho was succeeded by Matthew Visconti above mentioned; and Milan continued in subjection to that family without any very memorable occurrence till the year 1378, when, by the death of Galeazzo II. his brother Barnabo became sovereign of Milan. He was of a brave and active disposition ; but excessively pro- iuse in his expenses, as his brother Galeazzo had also been *, and to procure money to supply his extra¬ vagancies, was obliged to oppress his subjects. Ga¬ leazzo had engaged in an enterprize against Bologna, and the siege of it was continued by Barnabo. It lasted for nine years 5 and during this time is said to have cost 300 millions of gold, a prodigious sum in those days, near 40 millions sterling, the lowest gold coin being in value somewhat more than half a crown English. Both the brothers were excessively fond of building. Barnabo erected a bridge over the Adda, consisting of three stories *, the lowest for chariots and heavy carriages, the middle for horses, and the up¬ permost for foot passengers. He built also another Vol. XIV. Part I. f bridge which was carried over houses without touching Milan, them. To accomplish these, and many other expensive —\r—- schemes, he became one of the greatest tyrants imagi¬ nable, and every day produced fresh instances of his ra¬ pacity and cruelty. He instituted a chamber of inquiry, for punishing all those who had for five years before been guilty of killing boars, or even of eating them at the table of another. They who could not redeem themselves by money were hanged, and above 100 wretches perished in that manner. Those who had any thing to lose were stripped of all their substance, and obliged to labour at the fortifications and other pub¬ lic works. He obliged his subjects to maintain a great many hunting dogs, and each district was taxed a certain number. The overseers of his dogs were at. the same time the instruments of his rapacity. When the dogs were poor and slender, the owners were al¬ ways fined ; but when the dogs were fat, the owners were also fined for sufi'ering them to live without exercise. The extravagant behaviour of Barnabo soon rendered public affairs ready for a revolution, which was at last accomplished by his nephew John Galeazzo. He af¬ fected a solitary life, void of ambition, and even inclin¬ ing to devotion 5 but at the same time took care to have his uncle’s court filled with spies, who gave him infor¬ mation of all that passed. He reduced his table and manner of living, pretending that he took these steps as preparatives to a retirement from the world, which was soon to take place after he had paid a religious vow. In short, he acted his part so well, that even Barnabo, though abundantly cautious, had no suspicion of his having any designs against him ; and so entirely did he conceal his ambition, that he several times made application to his uncle for his interest to procure him a quiet retreat as soon as his religious vows were perform¬ ed. One of these was to pay a visit to the church of the blessed Virgin upon Mount Varezzio. This was to be done with so much secrecy that all kinds of eye wit¬ nesses were to be excluded j and it was with difficulty that Barnabo himself and two of his sons were allowed to accompany our devotee. But, in the mean time, the hypocritical Galeazzo had soldiers advancing from all quarters ; so that Barnabo and his sons were imme¬ diately seized, and the houses of those who had sided with them given up to be plundered. The booty in plate, money, and all kinds of rich furniture, was im¬ mense. The ministers of the late government were dragged from their hiding places, and put to death j and at last the citadel itself fell into the hands of Ga¬ leazzo, who found in it an immense sum of money. Barnabo was carried prisoner to Tritici, a castle of his own building, where he had the happiness to find one person still faithful to him. This was his mistress, named Doninia Porra ; who, when he was abandoned by all the world, shut herself up a voluntary prisoner in his chamber, and remained with him as long as he lived, which was only seven months after his degrada- dation. John Galeazzo was the first who took upon him the title of the Duke of Milan, and was a prince of great policy and no less ambition. He made war with the Florentines, became master of Pisa and Bologna, and entirely defeated the emperor in 1401, so that he en¬ tertained hopes of becoming master of all Lombardy, and cutting off all possibility of invading it either from M France Milan. MIL [ go France or Germany; but bis designs were frustrated by death, which happened in 1402, in the 55th year of his age. After his decease the Milanese govern¬ ment fell into the most violent distractions, so that it could not be supported, even in time of peace, with¬ out an army of 20,000 foot and as many horse. In the year 1421, however, Philip duke of Milan became ma¬ ster of Genoa ; but though he gained great advantages in all parts of Italy, the different states still found means to counterbalance his successes, and prevent him from enslaving them : so that Milan never became the capital of any extensive empire ; and in 1437 Genoa re¬ volted, and was never afterwards reduced. Philip died in 1448, and by his death the male line of the Visconti family was at an end. The next law¬ ful heir was Valentina his sister, who had married the duke of Orleans, son to Charles V. of France. By the contract of that marriage, the lawful progeny of it was to succeed to the duchy of Milan in failure of the heirs male of the Visconti family', but this succession was disputed by Sforza, who had married Philip’s na¬ tural daughter. It is certain, however, that the right¬ ful succession was vested in the house of Orleans and the kings of France ; and therefore though the Slor- 7.a family got possession of the duchy for the present, Louis XII. afterwards put in his claim, being a grand¬ son to John Galeazzo. For some time he was success¬ ful ; but the French behaved in such an insolent man¬ ner, that they were driven out of the Milanese by the Swiss and Maximilian Sforza. The Swiss and Mila¬ nese were in their turn expelled by Francis I. who obliged the Sforza family to relinquish the government for a pension of 30,000 ducats a-year. Francis Sforza, the son of Maximilian, however, being assisted by the emperor and the pope, regained the possession of the Milanese about the year 1521 $ and, eight years after, the French king, by the treaty of Cambray, gave up his claim on the duchy. But, in fact, the emperors of Germany seem to have had the fairest title to the Milanese in right of their be¬ ing for a long time sovereigns of Italy. On the death of Francis Sforza, therefore, in the year I53^> em“ peror Charles V. declared the Milanese to be an impe¬ rial fief, and granted the investiture of it to his son Philip II. king of Spain. In his family it continued till the year 1706, when the French and Spaniards were driven out by the Imperialists, and the emperor again took possession of it as a fief. It was confirmed to his house by the treaty of Baden in 1714, by the quadruple alliance in 1718, and by the treaty of Aix-la- Chapelle in 1748. The duchy of Milan is one of the finest provinces in Italy. It is hounded on the south by the Apen- nine mountains, and the territory of Genoa; on the north by Switzerland; on the east by the Venetian territories, and the duchies of Mantua, Parma, and Placentia ;. and on the west by Savoy, Piedmont, and Montferrat; extending from north to south about 100 miles, and from east to west about 108. It is well watered by the Tessino, the Sesia, the Adda, the Po, the Oglio, the Lombro, Serio, &c. and also by se¬ veral canals and lakes. Of the latter, the Lago Mag- giore is between 30 and 40 miles in. length, and in some places six or seven miles broad. In it lie the JSoromcan islands, as they are called, viz.. Isola Bella ] MIL and Isola Madre, the beauty of which almost exceeds imagination ; art and nature seem to have vied with one another in embellishing them. In each ol them is a palace with delicious gardens, belonging^ to the Boromean family. Jhe water 01 the lake is clear and of a greenish colour, and abounds with fish. Ihe hills with which it is surrounded present a most charm¬ ing landscape, being planted with vines and chesnut trees, interspersed with summer houses. There is a canal running from it towards Switzerland, with which the city of Milan has a communication. It was an¬ ciently called Lacus Verbanus. 1 he Lago de Como, which was called bv the Latin poets Lacus Lavius, hut had its modern name from the city near which it lies, extends itself about 30 miles northward from Como, but its greatest breadth is not above five miles. From the Lago Maggiore issues the Tessino ; and from that of Como the Adda. Of the other lakes, that of Lugano and Guarda are the chief: that of Guarda was ancient¬ ly called Benacus. The trade and manufactures of this duchy consist principally in silk stuffs, stockings, gloves, and hand¬ kerchiefs, linen and woollen cloth, hardware, curious W’orks of crystal, agate, hyacinths, and other gems , but their exports are usually far short ol their imports. It produces also abundance of rice, corn, fruit, wine, and hemp. Great quantities of cheese are also made here. In the year 1767, the Austrian government of Milan published a law, by which all the rights which the pope- or the bishops had till then exercised over ecclesiastics, either with regard to their effects or persons, was trans¬ ferred to a council established for that purpose at Mi¬ lan. By the same edict, all ecclesiastics were obliged to sell the estates which they had become possessed o£ since the year 1722 ; and no subject, whether ecclesi¬ astic or. secular, was to go to Borne to solicit any fa¬ vour, except letters of indulgence, without the consent of the said council. This duchy was subdued by the French in the year- 1796, when it formed a part of the Cisalpine republic. When hostilities recommenced in 1799, it was again taken by the allies, hut afterwards reconquered by> Bonaparte in 1800. From this period it formed a part of the kingdom of Italy, till the overthrow of Bonaparte’s government in 1814, when it was restored to Austria with the rest of Lombardy. Milan, the capital of the duchy of that name, in Latin Mediolanum, is a large city, and has a wall and rampart round it, with a citadel; yet is thought to be incapable of making any great resistance. The gardens within the city take up a great deal oi ground. In the citadel is a foundery for cannon, and an arsenal furnished with arms lor 12,000 men. Milan hath experienced a great variety of fortune, having been subject sometimes to the French, some¬ times to the Spaniards, and sometimes to the Germans. A great number of persons of rank and fortune live in it, especially during the winter. The ladies in France are not allowed more liberty than those of this city : even the austerities of the monastic life are so far mitigated here, that gentlemen have not only the liberty of talking with the nuns, and of rallying and laughing at the grate, but also of joining with them in concerts of music, and of spending whole afternoons in Milan. MIL [91 Milan, i'1 tlleii4 company. The place where the beau monde take the air, either in their coaches or on foot, is the rampart betwixt the Porta Orientale and the Porta Tosa, where it is straight and broad, and extremely pleasant, being planted with white mulberry trees, and commanding a prospect on one side of the open country, and on the other of the gardens and vineyards between the ramparts and the city. Milan, which is said to have been built by the Gauls about 200 years after the foundation of Rome, contains a great number of stately edifices, as churches, convents, palaces, ami hospitals. The cathedral is a vast pile, all of marble j and is the largest in Italy, except that of St Peters at Rome. It is 449 feet in length, 275 in breadth, and 238 in height, under the cupola. Though founded in 1386, the fagade was only completed a few years ago by order of Bcnaparte. Of the great number of sta¬ tues about it, that of St Bartholomew, just flead alive, with his skin hanging over his shoulders ; and of Adam and Eve, over the main portal, are the finest. The pillars supporting the roof of the church are all of marble, and the windows finely painted. This church contains a treasure of great value, particularly a shrine of rock crystal, in which the body of St Charles Bo- romseo is deposited. The other churches most worthy a stranger’s notice are those of St Alexander, St Je¬ rome, St Giovanni di Casarotti della Passione, that of the Jesuits, and of St Ambrose, in which lie the bo¬ dies of the saint and of the kings Pepin and Bernard. In the Ambrosian college, founded by Frederic Bo- romaeo, 16 professors teach gratis. In the same col¬ lege is also an academy of painting, with a museum, and a library containing about 45,000 printed books and manuscripts; among the last of which is a transla¬ tion of Josephus’s History of the Jews, done by Rufi- tms about 1200 years ago, and written on the bark of a tree ; St Ambrose’s works on vellum, finely illumi¬ nated $ the orations of Gregory Nazianzen, and the works of Virgil, in folio, with Petrarch’s note?. In the museum are Leonard! da Vinci’s mathematical and mechanical drawings, in 12 large volumes. The seminary for sciences, the college of the nobles, the Helvetian college, and the mathematical academy, are noble foundations, and stately buildings. Of the hos¬ pitals, the most remarkable are the Lazaretto, and that called the great hospital; the latter of which re¬ ceives sick persons, foundlings, and lunatics, and has six smaller hospitals depending on it, with a revenue of 100,000 rix dollars. The number of the inhabitants of this city is said to be about 130,00c. It has been 40 times besieged, taken 20 times, and four times almost entirely demo¬ lished *, yet it hath alwavs recovered itself. It is said that gunpov/der is sold here only by one person, and in one place. The houses of entertainment, and the ordinaries here, are represented as very indifferent.— Mr Keysler says, it is not unusual for young travellers, when they go to any of the taverns in Milan, to be asked, “ whether they choose a lettofornito, or female bedfellow,” who continues masked till she enters the bedchamber. Milan is described as inferior to Turin both in beauty and conveniency, many of the streets being crooked and narrow, and paper windows much more frequent than in that city ; even in grand pa¬ laces, the windows are often composed promiscuously ] M I L of glass and pa pel’. There are four theatres in the Milan, city : the great theatre Della Scala, built in 1778 ; that "y—- of the Canobiana, the theatre Re j and the Careano. On the right of the Place d’Armes is a magnificent am¬ phitheatre, appropriated to horsemanship and games, erected during the French rule. Two large canals extend from hence, the one to the Tessino, and the other to the Adda } the Tessino having a communica¬ tion with the Lago Maggiore, and, by a canal, with the Sesia; and the Adda issuing from the Lago di Co¬ mo, and having a communication by canals with the Lombro and Serio. In a void space in one of the streets of Milan, where stood the house of a barber who had conspired with the commissary of health to poison his fellow citizens, is erected a pillar called Colonna In- fame, with an inscription to perpetuate the memory of the execrable design. The environs of this city are very pleasant, being adorned with beautiful seats, gardens, orchards, &c. About two Italian miles from it, at the seat of the Simonetti family, is a build ing, that would have been a masterpiece of its kind had the architect designed it for an artificial echo. It will return or repeat the report of a pistol above 60 times; and any single musical instrument well touched will have the same effect as a great number of instru¬ ments, and produce a most surprising and delightful concert. Bonaparte was crowned king of Italy in this city in May 1 805, and it was visited by the emperor of Au¬ stria in 1816. It is now the capital of the kingdom of Venetian Lombardy. According to Dr Moore, “ there is no place in Italy, perhaps in Europe, where strangers are received in such an easy hospitable manner as at Milan. For¬ merly the Milanese nobility displayed a degree of splendour and magnificence, not only in their enter¬ tainments, but in their usual style of living, unknown in any other country of Europe. They are under a necessity at present of living at less expence, but they still show the same obliging and hospitable disposition. This country having, not very long since, been pos¬ sessed by the French, from whom it devolved to the Spaniards, and from them to the Germans, the. troops of those nations have, at different periods, had their residence here, and in the course of these vi¬ cissitudes, produced a style of manners, and stamped a character on the inhabitants of this duchy, difl’erent from what prevails in any other part of Italy ; and nice observers imagine they perceive in Milanese man¬ ners, the politeness, formality, and honesty imputed to those three nations, blended with the ingenuity na¬ tural to Italians. In Italy, the ladies have no notion of quitting their carriages at the public walks, and using their own legs as in England and France. On see¬ ing the number of servants, and the splendour of the equipages which appear every evening at the Corso or the ramparts, one would not suspect that degree of depopulation, and diminution of wealth, which we. are assured has taken place within these few years all over the Milanese *, and which proceeds from the bur¬ densome nature of some late taxes, and the insolent and oppressive manner in which they are gathered.”— Milan is situated 29 leagues N. E. of Turin, no N. W. of Rome, and 143 S. E. of Paris.—E. Long. 9. 11. N. Lat. 45. 28. M 2 MILBORN -PORT.; Milan .11 Mildew. MIL [ MILBORN-port, a town of Somersetshire in England, seated on a branch of the river Parret, 115 (miles from London. Though represented in parlia¬ ment, it is no market town nor corporation ; but it appears in Eomesday-book to have had a market once, and 56 burgesses. It is in a manner surrounded by Dorsetshire. Here are nine capital burgesses, who yearly choose two bailifis, that have the government of the borough under them, and jointly return the members to parliament with the two stewards, who are chosen yearly out of nine commonalty stewards, and have the custody of the corporation-seal. These two stewards also distribute the profits of the lands given to the poor here, of which the said commonalty stewards are trustees. The number of inhabitants in 1811 was 1000, of houses 230. W. Long. 2. 37. N. Lat. 50. 50. MILBROOK, a town of Cornwall, on the west side of Plymouth haven. It has a good fishing trade, and has formerly furnished our fleet with many able hands. MILDENHALL, a town of Suffolk, seven miles from Newmarket, 12 from Bury, and 70 from Lon¬ don. It is situated on the river Lark, a branch of the Ouse, with a harbour for boats, and contained in 1811, 2493 inhabitants. It has a well frequented market on Fridays. Its church has a tower or steeple 120 feet high. E. Long. o. 33. N. Lat. 52. 24. MILDE W, is said to be a kind of thick, clammy’ sweet juice, exhaled from, or falling down upon, the leaves and blossoms of plants. By its thickness and clamminess it prevents perspiration, and hinders the growth of the plant. It sometimes rests on the leaves of trees in form of a fatty juice, and sometimes on the ears of corn. It is naturally very tough and viscous, and becomes still more so by the sun’s heat exhaling its more fluid parts ; by which means the young ears of corn are so daubed over, that they can never arrive at their full growth. Bearded wheat is less subject to the mildew than the common sort •, and it is observed that newly dunged lands are more liable to mildew than others. The best remedy is a smart shower of rain, and immediately afterwards a brisk wind. If the mildew is seen before the sun has much power, it has been recommended to send two men into the field with a long cord, each holding one end j and drawing this along the field through the ears, the dew will be dislodged from them, before the heat of the sun is able to dry it to that viscous state in which it does the mischief. Some also say, that lands which have for many years been subject to mildews, have been cured of it by sowing soot along with the corn, or immediately after it. Mr J. S. Segar, the author of a treatise upon this subject, observes, that the mildew is of such a sharp corrosive nature, that it raises blisters on the feet of the shepherds who go barefoot, and even consumes the hoofs of the cattle. He suspects that it possesses some arsenical qualities, though he does not pretend to affirm this positively. Its pernicious influence, ac¬ cording to him, is rendered still more powerful by a variety of circumstances ; such as sending the cattle into the fields too early in the spring j their drinking water mixed with ice, or but lately thawed j their being 92 ] MIL i kept in stables that are too,close and filthy, and which are not sufficiently aired. 1 he same author considers the mildew as a principal cause of epidemical distem- ^ pers among the cattle. The mildew producing these diseases, he says, is that which dries and burns the grass and leaves. It falls usually in the morning, particularly after a thunder storm. Its poisonous qua¬ lity (which does not continue above 24 hours) never operates but when it has been swallowed immediately after its falling. The disorder attacks the stomach, is accompanied with pimples on the tongue, loss ot appetite, a desiccation of the aliments in the stomach, a cough, and difficulty of respiration. As a preserva¬ tive, the author prescribes purging in spring and in winter. The medicine he advises is composed of 30 grains of sulphur of antimony, and 60 grains of resin of jalap. He is against vomiting, and every thing that is of a heating nature. MILE, a measure of length or distance, containing eight furlongs. The English statute mile is 80 chains, or 1760 yards j that is, 5280 feet. We shall here give a table of the miles in use among the principal nations of Europe, in geometrical paces, 60,ooo of which make a degree ol the equator. Mildew .11 Miletuii Mile of Russia of Italy of England of Scotland and Ireland Old league of France The small league, ibid. The mean league, ibid. The great league, ibid. Mile of Poland of Spain of Germany of Sweden of Denmark of Hungary Geometrical paces. 750 1000 1200 I5OO 1500 2000 25OO 3000 3000 3428 4OOO 5oo° 5o°o 6000 MILETUS, in Ancient Geography, a town of Crete mentioned by Homer 5 but where situated does not ap¬ pear. It is said to be the mother town of Miletus in Caria, whither a colony was led by Sarpedon, Minos’s brother, (Ephorus, quoted by Strabo). Milesii, the people, (Ovid). Miletus, in Ancient Geography, a celebrated town of Asia Minor, on the confines of Ionia and Caria. It was the capital city of all Ionia, and famous both for the arts of war and peace. It was situated about 10 stadia south of the mouth of the river Mseamier, near the sea coast. It was founded by a Cretan colony under Miletus, the companion of Bacchus j or (according to others) by Neleus the son of Codrus •, or by Sarpedon- a son of Jupiter. It has successively been called Lelegeis, Pithyusa, and Anactoria. The inhabitants^ called Milem, were very powerful, and long maintain¬ ed an obstinate war against the kings of Lydia. They early applied themselves to navigation j and planted no less than 80 colonies, or (according to Seneca^ 380, in different parts of the world. It was the only town that made head against Alexander, and was with much difficulty taken. It gave birth to Thales, Miletus I! , Milford. MIL t 93 J MIL Thales, one of the seven wise men, and the first who applied himself to the study of nature. It was also the country of Anaximander, the scholar and succes¬ sor of Thales, the inventor of sun dials and the gno¬ mon, and. the first that published a geographical map ; of Anaximenes, scholar and successor to the forego¬ ing 5 and of other great men. It was noted for its excellent wool, according to Virgil ; and was also ce¬ lebrated for a temple and oracle of Apollo Didy- mseus. This famous people, from being powerful, becoming afterwards opulent and abandoned to plea¬ sures, lost both their riches and their power.—At pre¬ sent it is called by the Turks Melas, and not far distant from it runs the river Mseander. St Paul going from Corinth to Jerusalem passed by Miletus, and as he went by sea, and could not take Ephesus in his way, be caused the bishops and priests of the church of Ephesus to come to Miletus (Acts xx. 15. &c.), which was about 12 leagues from them. MILFOIL, or Yarrow. See Achillea, Botany Index. MILFORD, a town of North America, in Sussex county, in the Delaware state, is situated at the source of a small river, 15 miles from Delaware bay, and 150 southward of Philadelphia. This town, which contains about 80 houses, has been built, except one house, since the revolution. It is laid out with much taste, and is by no means disagreeable. The inhabitants are Epis¬ copalians, Quakers, and Methodists. Milford Haven, one of the finest harbours in Europe, and indisputably the best in Britain, is situ¬ ated in Pembrokeshire in South Wales, and lies on the north side of the Bristol channel. It is very large, safe, and deep ; there is no danger of going in or out with the tide, or almost with any wind. If a ship comes in without a cable or anchor, she may run ashore on the ooze, and there lie safe till she is refitted j and in an hour’s time she may get out of the harbour into the open sea. It lies extremely convenient for ships bound from the English or Bristol channels to Ireland, or farther west, and from thence to the channels. It is said, that icoo sail of any size may ride secure in this haven. It has 16 deep and safe creeks, five bays, and 13 roads, all distinguished by their several names. The spring tide rises 36 feet, so that ships may at any time be laid ashore. Dale harbour is a ready outlet for small vessels, where they mav ride in two or three fathoms at low water.—In the reign of Queen Elizabeth, before the Spanish inva¬ sion, two forts wrere begun at the entrance of Mil¬ ford Haven, one on each side, called Nangle and Dale blockhouses j but they were not then finished.— The Stack rock rises here above water, lying near the middle of the entrance between Nangle and Dale. Penermouth is the opening of that branch of the ha¬ ven on which the town of Pembroke is seated, and where the customhouse of Milford is kept. J he breadth of the entrance between rock and rock is but 200 yards at high water, and 112 at low water. There is a ridge of rocky ground that has the name of Carrs, which runs almost across Milford Haven, from Peter church towards Llandstadwell, where it renders the landing place difficult to strangers, from its not appearing at low water. The great conveni¬ ence of this harbour is, that in an hour’s time a ship may be in or out of it, and in the way between the Milford Land’s End and Ireland. As it lies near the mouth |{ of the Severn, a ship in eight or ten hours may be i Mlbtary- over on the coast of Ireland, or off the Land’s End v"”'_ in the English channel and a vessel may get out hence to the west much sooner than from either Ply¬ mouth or Falmouth. This harbour has been greatly improved by new works, at the expence of the go¬ vernment. The parliament on April 14. 1759 granted lO,OOOl. for fortifying the harbour of Milford, all of which was expended on the fort at Neyland, which, however, still remains unfinished. MILIARY, in general, something resembling millet seed. Miliary Fever. See Medicine Index. MILITANT, or Church-militant, denotes the body of Christians while here on earth. MILITARY, something belonging to the soldiery or militia. Military Discipline, the training of soldiers, and the due enforcement of the laws and regulations instituted by authority for their conduct. Next to the forming of troops, military discipline is the first object that presents itself to our notice ; it is the soul of all armies ; and unless it be established amongst them with great prudence, and supported writh unshaken resolution, they are no better than so many contemptible heaps of rabble, which are more dangerous to the very state that maintains them than even its de¬ clared enemies. Military Execution, the ravaging or destroying of a country, or town, that refuses to pay the contribution inflicted upon them. Military Exercise. See Exercise and Words of Command. Military State, in British polity, one of the three divisions of the laity. See Laity. This state includes the wdiole of the soldiery, or such persons as are peculiarly appointed among the rest of the people for the safeguard and defence of the realm. In a land of liberty, it is extremely dangerous to make a distinct order of the profession of arms. In ab¬ solute monarchies, this is necessary for the safety of the prince 5 and arises from the main principle of their constitution, which is that of governing by fear ; but, in free states, the profession of a soldier, taken singly and merely as a profession, is justly an object of jea¬ lousy. In these no man should take up arms but with a view to defend his country and its laws : he puts not off the citizen when he enters the camp ; but it is be¬ cause he is a citizen, and would wish to continue so, that he makes himself for a while a soldier. The laws therefore, and constitution of these kingdoms, know no such state as that of a perpetual standing soldier, bred up to no other profession than that of war j and it was not till the i*eign of Henry VII. that the kings of England had so much as a guard about their per¬ sons. In the time of the Anglo-Saxons, as appears from Edward the Confessor’s laws, the military force of England was in the hands of the dukes or heretochs, who were constituted through every province and county in the kingdom ; being taken out of the princi¬ pal nobility, and such as were most remarkable for be- MIL [ 94 ] MIL Military, ing sapie)itcs,fideles% ctanimosi. Their duty was to lead “* v ‘ and regulate the English armies with a very unlimited power •, prout eis visum fuel'it, ad honorem coronce et uti- litatem regni. And because of this great power they were elected by the people in their full assembly, or folkmote, in the same manner as sheriffs were elected' following still that old fundamental maxim of the Saxon constitution, that where any officer tvas entrusted with such power, as, if abused, might tend to the oppression of the people, that power was delegated to him by the vote of the people themselves. So too, among the an¬ cient Germans, the ancestors of our Saxon forefathers, they had their dukes, as well as kings, wdth an inde¬ pendent power over the military, as the kings had over the civil state. The dukes wrere elective, the kings he¬ reditary : for so only can be consistently understood that passage of Tacitus, lieges ex nobilitate, duces ex virtute summit. In constituting their kings, the fa¬ mily or blood royal was regarded *, in choosing their dukes or leaders, rvarlike merit: just as Caesar relates of their ancestors in his time, that whenever they went to war, by way either of attack or defence, they elect¬ ed leaders to command them. This large share of power, thus conferred by the people, though intended to preserve the liberty of the subject, wras perhaps un¬ reasonably detrimental to the prerogative of the crown : and accordingly we find a Very ill use made of it by Edric duke of Mercia, in the reign of King Edmund Ironside *, who, by his office of duke or heretoch, was entitled to a large command in the king’s army, and by his repeated treacheries at last transferred the crown to Canute the Dane. It seems universally agreed by all historians, that King Alfred first settled a national militia in this king¬ dom, and by his prudent discipline made all the sub¬ jects of his dominions soldiers : but we are unfortu¬ nately left in the dark as to the particulars of this his so celebrated regulation j though, from what was last observed, the dukes seem to have been left in possession of too large and independent a power: which enabled Duke Harold, on the death of Edward the Confessor, though a stranger to the royal blood, to mount for a short space the throne of this kingdom, in prejudice of Edgar Ethel ing the rightful heir. Upon the Norman conquest, the feodal law was in¬ troduced here in all its rigour, the whole of which is built on a military plan. In consequence thereof, all the lands in the kingdom were divided into what were called knight's fees, in number above 60,000 ; and for every knight’s fee, a knight or soldier, miles, was bound to attend the king in his wars, for 40 days in a year ; in which space of time, before war was reduced to a science, the campaign was generally finished, and a kingdom either conquered or victorious. By this means the king had, without any expence, an army of 60,000 men always ready at his command. And ac¬ cordingly we find one, among the laws of William the Conqueror, which in the king’s name commands and firmly enjoins the personal attendance of all knights and others 5 put into milk, oil, &.c. and given daily to the pa¬ tient. MiLKY-JFay. See Astronomy Index. MILL, a machine for grinding corn, &c. of which there are various kinds, according to the different me¬ thods of applying the moving power; as water-mills, wind-mills, mills worked by horses, &c. See Mecha¬ nics Index. The first obvious method of reducing corn into flour for bread would be by the simple expedient of pound¬ ing. And that was for ages the only one which was practised by the various descendants of Adam, and ac¬ tually continued in use among the Romans below the reign of Vespasian. But the process was very early improved by the application of a grinding power, and the introduction of millstones. rIhis, like most of the common refinements in domestic life, was pro¬ bably the invention of the antediluvian world, and cer¬ tainly practised in some of the eaidiest ages after it; and, like most of them, it was equally known in the east and west. Hence the Gauls and Britons appear lamiliar- ly acquainted with the use of hand-mills before the time of their submission to the Romans ; the Britons particu- Mill. MIL [ 104 ] larly distinguishing them, as the Highlanders and we original Britons. distinguish them at present, by the simple appellations of querns, comes, or stones. And to these the Romans added the very useful invention of water mills, for this discovery the world is pretty certainly indebted to the genius of Italy ; and the machine was not uncom¬ mon in the country at the conquest of Lancashire. This, therefore, the Romans would necessarily intro¬ duce with their many other refinements among us. And that they actually did, the British appellation of a water-mill fully suggests of itself} the mehn of the Welsh and Cornish, the mull, meill, and mehn of the Armoricans, and the Irish muilean and muihnd, being all evidently derived from the Roman mola and molen- dinum. The subject Britons universally adopted the Roman name, but applied it, as we their successors do, only to the Roman mill; and one of these was proba¬ bly erected at every stationary city in the kingdom. Whitaker's One plainly was at Manchester, serving equally the Hist of pUrposes of the town and the accommodation of the Munches- . a„j „„„ Timulrl snfliripnt. as the fer. garrison.—And one alone would be sufficient, as the use of handmills remained very common in both, many having been found about the site of the station particu¬ larly ", and the general practice having descended a- mong us nearly to the present period. Such it would be peculiarly necessary to have in the camp, that the garrison might be provided against a siege. And the water-mill at Manchester was fixed immediately below the Castlefield and the town, and on the channel of the Medlock. There, a little above the ancient ford, the sluice of it was accidentally discovered about 30 years ago. On the margin of Dyer’s croft, and opposite to some new constructions, the current of the river, acci¬ dentally swelled with the rains, and obstructed by a dam, broke down the northern bank, swept away a large oak upon the edge of it, and disclosed a long tun¬ nel in the rock below. This has been since laid open in part with a spade. It appeared entirely uncovered at the top, was about a yard in width, and another in depth, but gradually narrowed to the bottom. The sides showed everywhere the marks of the tool on the rock, and the course of it was parallel with the channel. It was bared by the flood about 25 yards only in length, but was evidently continued for several further } hav¬ ing originally begun, as the nature of the ground evin¬ ces, just above the large curve in the channel of the Medlock. For the first five or six centuries of the Roman state, there were no public bread bakers in the city of Rome. They were first introduced into it from the east, at the conclusion of the war with Perseus, and about the year 167 before Christ. And, towards the close of the first century, the Roman families were supplied by them every morning with fresh loaves for breakfast.— But the same custom, which prevailed originally among the Romans and many other nations, has continued nearly to the present time among the Mancunians. The providing of bread for every family was left entirely to the attention of the women in it *, and it was baked upon stones, which the Welsh denominate grei- diols and we gredles. It appears, however, from the kiln-burnt pottery which has been discovered in the British sepulchres, and from the British appellation of an odijn or oven remaining among us at present, that furnaces for baking were generally known among the S M I L An odyn would, thereiore, be erect- ed at the mansion of each British baron, for the use MiUstom of himself and his retainers. And, when he and they' v^* removed into the vicinity of a Roman station, the oven would be rebuilt with the mansion, and the public bakehouses of our towns commence at the first foun¬ dation of them. One bakehouse would be constructed, as we have previously shown one mill to have been set up, for the public service of all the Mancunian families. One oven and one mill appear to. have been equally established in the town. And the inhabitants of it ap¬ pear immemorially accustomed to bake at the one and grind at the other. Both, therefore, were in all pro¬ bability constructed at the first introduction of water¬ mills and ovens into the country. The great similarity of the appointments refers the consideration directly to one and the same origin for them. And the gene¬ ral nature of all such institutions points immediately to the first and actual introduction of both. And, as the same establishments prevailed equally in other parts of the north, and pretty certainly obtained over all the ex¬ tent of Roman Britain, the same erections were as certainly made at every stationary town in the king¬ dom. Mill, John, a very learned divine, was born at Shap in Westmoreland, about the year 1645 ", and be¬ came a servitor of Queen’s college, Oxford. On his entering into orders he became an eminent preacher, and was made prebendary of Exeter. In 1681, he ■was created doctor of divinity ; about the same time he was made chaplain in ordinary to King Charles II. and in 1685 he was elected principal of St Edmund’s hall Oxford. His edition of the Greek Testament, which will ever render his name memorable, was pub¬ lished about a fortnight before his death, which hap¬ pened in June jqo*]. Dr Mills was employed 30 years in preparing this edition. MILLSTONE, the stone by which corn is ground. The millstones which wc find preserved from ancient times are all small, and very different from those in use at present. Thoresby mentions two or three such found in England, among other Roman antiquities, which were but 20 inches broad 5 and there is great reason to believe that the Romans, as well as the Egyptians of old, and the ancient Jews, did not em¬ ploy horses, or wind, or water, as we do, to turn their mills, but made their slaves and captives of war do this laborious work : they were in this service placed behind these millstones, and pushed them on with all their force. Sampson, when a prisoner to the Philistines, was treated no better, but was con¬ demned to the millstone in his prison. The runner or loose millstone, in this sort of grinding, was usually very heavy for its size, being as thick as broad. I his is the millstone which is expressly prohibited in Scrip¬ ture to take in pledge, as lying loose it was more easily removed. The Talmudists have a story, that the Chaldeans made the young men of the captivity carry millstones with them to Babylon, where there seems to have been a scarcity at that time ; and hence, probably, their paraphrase renders the text “ have borne the mills or millstones j” which might thus be true in a literal sense. They have also a proverbial expression of a man with a millstone about his neck j which they use to express a man under the severest weierht MIL [ ! Millstone weight of affliction. This also plainly refers to this || small sort of stones. (Millen- Rhenish Millstone, a stone which has been clas- nium' , sed among volcanic products, on account of its appear¬ ance, which is a blackish gray, porous, and very much resembling a lava of Mount Vesuvius. MILLEDGEVILLE, a town in the state of Geor¬ gia in North America, situated on the river Occonee, about 150 miles from the sea. Its population in 1810 was 1257. W. Long. 83. 10. N. Lat. 32. 40. MILLENARIANS, or Chiliasts, a name given to those in the primitive ages, who believed that the saints will reign on earth with Christ 1000 years. See Millenium. MILLENER, or MILLINER, one who sells ribbands and, dresses, particularly head dresses for women ; and who makes up those dresses. Of this word difi’erent etymologies have been given. It is not derived from the French. The French cannot express the notion of milliner, otherwise than by the circumlocution marchand or marchande des modes. Neither is it derived from the Low Dutch language, the great, but neglected, magazine, of the Anglo-Saxon. For Sewel, in his Dictionary English and Dutch, I7°8> describes mil- lener to be “ a pedlar who sells ribbands and other trimmings or ornaments j a French pedlar.” Littleton, in his English and Latin Dictionary, pub¬ lished 1677, defines millener, “ a jack of all trades q. d. millenarius, or mille mercium venditor; that is, “ one who sells a thousand different sorts of things.” From this etymology, which seems fanciful, we must hold, that it then implied what is now termed “ a ha¬ berdasher of small wares.” Before Littleton’s time, however, a somewhat nicer characteristic than seems compatible with his notion, appears to have belonged to them j for Shakespeare, in his Henry IV. makes Hotspur, when complaining of the daintiness of a courtier, say, “ He was ’perfumed like a milliner. The fact seems to be, that there were milleners of several kinds : as, horse milleners, (for so those persons were called who make ornaments of coloured worsted for horses) j haberdashers of small wares, the milleners of Littleton j and milleners such as those now pecu¬ liarly known by that name, whether male or female, and to whom Shakespeare’s allusion seems most appro¬ priate. Lastly, Dr Johnson, in his dictionary, derives the word from milaner, an inhabitant of Milan, from whence people of this profession first came, as a Lom¬ bard is a banker. MILLE passes, or Millia Passvnm; a very com¬ mon expression among the ancient Romans for a mea¬ sure of distance, commonly called a mile. Milliarium, rarely used. Which Hesychius made to consist of seven st.adia 5 Plutarch, little short of eight; but many others, as Strabo and Polybius, make it just eight stadia. The reason of this difference seems to be, that the former had a regard to the Grecian foot, which is greater than the Roman or Italic. This distance is oftentimes cal¬ led lapis, which see. Each passus consisted of five feet (Columella). MILLENNIUM, w a thousand years j” generally Vol. XIV. Part I. t 05 ] MIL employed to denote the thousand years, during which, Milieu, according to an ancient tradition in the church, ground- nium. ed on some doubtful texts in the Apocalypse and other ''■•■“V-' Scriptures, our blessed Saviour shall reign with the faithful upon earth after the first resurrection, before the final completion of beatitude. Though there has been no age of the church in which the millennium was not admitted by individual divines of the first eminence, it is yet evident from the writings of Eusebius, Irenaeus, Origen, and others among the ancients, as well as from the histories of Dupin, Mosheim, and all the moderns, that it was never adopted by the whole church, or made an article of the established creed in any nation. About the middle of the fourth century the Millen- nians held the following tenets : 1st, That the city of Jerusalem should be rebuilt, and that the land of Judea should be the habitation of those who were to reign on earth 1000 years. 2dly, That the first resurrection was not to be con¬ fined to the martyrs j but that after the fall of Anti¬ christ all the just were to rise, and all that were on the earth were to continue for that space of time. 3dly, That Christ shall then come down from hea¬ ven, and be seen on earth, and reign there with his servants. 4thly, That the saints during this period shall enjoy all the delights of a terrestrial paradise. These opinions rvere founded upon several passa¬ ges of Scripture, -which the Millenarians among the fathers understood in no other than a literal sense, but which the moderns, who hold that opinion, con¬ sider as partly literal and partly metaphorical. Of these passages, that upon which the greatest stress has been laid, we believe to be the following:—“ And I saw an angel come down from heaven, having the key of the bottomless pit, and a great chain in his hand. And he laid hold on the dx*agon, that old ser¬ pent, which is the devil and Satan, and bound him a thousand years, and cast him into the bottomless pit, and shut him up, and set a seal upon him, that he should deceive the nations no more till the thousand years should be fulfilled ; and after that lie must be loosed a little season. And I saw thrones, and they sat up¬ on them, and judgment was given unto them: and I saw the souls of them that were beheaded for the witness of Jesus, and for the word of God, and which had not worshipped the beast, neither his image, nei¬ ther had received his mark upon their foreheads, or in their hands j and they lived and reigned with Christ a thousand years. But the rest of the dead lived not again till the thousand years were finished. This is the first resurrection*.” This passage all the ancient* Rora. xx Millenarians took in a sense grossly literal j and taught, 1—5. that during the millennium the saints on earth were to enjoy every bodily delight. The moderns, on the other hand, consider the power and pleasure of this kingdom as wholly spiritual ; and they represent them as not to commence till after the conflagration of the present earth. But that this last supposition is a mis¬ take, the very next verse except one assures us : for we are there told, that “ when the thousand years are expired, Satan shall be loosed out of his prison, and shall go out to deceive the nations which are in the four quarters of the earth;'''1 and we have no reason to O believe * Rom. vi, I3- j- Eph. v. 14. $ 1 Cor. xv. 23. M I L [ believe that he will have such power or such liberty in “ the new heavens and the nexv earth wherein dwelleth righteousness.” For this and other reasons, which our limits will not permit us to enumerate, the most judicious critics con¬ tend, that the prophesies ol the millennium point, not to a resurrection of martyrs and other just men to reign with Christ a thousand years in a visible kingdom upon earth, but to that state of the Christian church, which, for a thousand years before the general judgment, will be so pure and so widely extended, that, when compa¬ red with the state of the world in the ages preceding, it may, in the language of Scripture, be called a resur¬ rection from the dead. In support ot this interpretation they quote two passages from St Paul, in which a con¬ version from Paganism to Christianity, and a reforma¬ tion of life, is called a resurrection from*the dead:— “ Neither yield ye your members as instruments of un¬ righteousness into sin ; but yield yourselves unto God as those that are alive from the dead*And again, “ Wherefore he saith, Awake thou that sleepest, and arise from the dead, and Christ shall give thee light f.” It is likewise to be observed, that in all the descriptions of the resurrection and future judgment which are given us at such length in the gospels and epistles, there is no mention made of a first and second resurrection at the distance of a thousand years from each other. There is indeed an order in the resurrection: for we are told J, that “ every man shall rise in his own order j Christ the first fruits, afterwards they that are Christ’s at his coming,” &c. But were the millennarian hypo¬ thesis well founded, the words should rather have run thus: “ Christ the first fruits, then the martyrs at his coming, and a thousand years afterwards the residue of mankind. Then cometh the end,” &c. These arguments strongly incline us to believe, that by the reign of Christ and the saints for a thousand years upon earth, nothing more is meant, than that before the general judgment the Jews should be con¬ verted, genuine Christianity be diffused through all na¬ tions, and mankind enjoy that peace and happiness which the faith and precepts of the gospel are calcu¬ lated to confer on all by whom they are sincerely em¬ braced. Our Saviour’s own account of his religion is, that from a small beginning it will increase to the full harvest. The millennium therefore is to be considered as the full effect of the Christian principles in the hearts of men, and over the whole world j and the divines who have treated of this subject endeavour to prove, that this is to be expected from the facts which have already existed, and from the importance of the Chris¬ tian doctrine. 1. The gradual progress of Christianity is no objec¬ tion to this fact. This is similar to the progress and advancement from less to greater perfection in every thing which possesses vegetable or animal life. The same thing is observed in the arts, in civiliz.ation, in societies, and 111 individuals—and why should it not be admitted to have place in religion ? There is, indeed, a general principle on which a gradual progression, both in the natural and moral world, is founded. The Almighty never employs supernatural means where the thi.ig can be accomplished by those which are natural. This idea is of the most general extent through the 3 106 ] MIL whole of the present system of nature. The possibility MilleiJ of another plan could easily be admitted ) but in this case nium: there would be a total alteration of every part of the v H works of God or of man that we are acquainted with. In the same manner, if the religion of Christ had been irresistible, it would have totally altered its natural con¬ sequences. It was necessary, therefore, from the pre¬ sent condition of man, as an active, intelligent, and ac¬ countable being, that means should be employed 5 and wherever means are employed, the effects produced must be gradual, and not instantaneous. 2. Though the progress of a divine revelation be gra¬ dual, yet it is to be expected, from the wisdom and compassion of God, that it will still be advancing in the hearts of men, and over the world. In the first stage of the church, the word of God, supported by miracles, ami by the animated zeal of men who spake what they saw and heard, grew and prevailed. In this case supernatural means were necessary, because the pre¬ judices of the world could not be subdued without them. It was the first watering of a plant which you after¬ wards leave to the dew of heaven. Miracles at the same time were employed only as the means of convic¬ tion j and they were not continued, because in this case they would have become a constant and irresistible principle, incompatible with the condition of man as a reasonable agent. After this power was withdrawn, there were many ages of ignorance and superstition in the Christian church. But what is necessary to be established on this subject is, not that the progress of Christianity has never been interrupted, but that on the whole it has been advancing. The effects of this religion on mankind, in proportion as it was received, were immediate and visible: It destroyed the gross su¬ perstition of idol worship j it abolished the practice, which was general in the heathen world, of reducing to the lowest state of servitude the greatest part of our brethren j it softened the horrors of war, even when the vices of mankind made defence necessary ; it entered into social and private life, and taught men benevolence, humanity, and mercy. It is in these blessed effects that we can observe the progress of Christianity even to this day. Superstition and idolatry were soon engrafted on the stem which our Saviour planted in the world; hut the simplicity of the gospel has been gradually under¬ mining the fabric of superstition 5 and the men who are most nearly interested in the deceit are now almost ashamed to show their faces in the cause. The practice of slavery has, generally speaking, been extinguished in the Christian world •, yet the remains of^t have been a disgrace to the Christian name, and the professors of that religion have now begun to see the inconsistency. War is not only carried on with less animosity, and less havock of the human species j but men begin to culti¬ vate more generally, and to delight in, the arts of peace. The increasing spirit of charity and benevo¬ lence, of which it were easy to give unexampled instan¬ ces in the present age, is a decided proof of the increa¬ sing influence of Christianity. At the same time, if* instead of these general principles, we were to descend to private examples of infidelity or of wickedness, ;t would be easy to bring proots in support ot an opposite opinion: but the reasoning would by no means be equally conclusive j for if the general principles by which society is regulated be more liberal and merciful, it MIL [ 107 ] MIL kfiilen- it is evident that there is more goodness in a greater nium. number of the human race. Society is nothing more |.j*—v-—than a collection of individuals j and the general tone, especially when it is on the side of virtue, which almost in every instance opposes the designs of leading and in¬ terested men, is a certain evidence of the private spirit. To show that this reformation is connected with Chri¬ stianity, it is unnecessary to state any comparison be¬ tween the influence of heathen, and the influence of Christian principles : between civilization as depending en the powers of the human understanding, and on the efficacy of the word of God. The whole of this conti'o- versy may be appealed to an obvious fact, viz. that as any nation has come nearer to the simplicity of the gospel in the standard of its worship, it has been more possessed of those national virtues which we have ascribed to the influence of Christianity. This fact is worth a thousand volumes of speculation on this sub- ject. 3. A revelation sanctioned by God, for a benevolent purpose, will be expected to produce eft'ects correspond¬ ing to the wisdom which gave it, and to the purpose for which it is employed. It may be gradual but it will be increasing, and it jnust increase, to the full har¬ vest. He that has begun the good work will also finish it. It is reasonable to expect this illustrious success of the gospel, both from the nature of the thing, and from the prophecies contained in the sacred scriptures. The precepts of the gospel, in their genuine sense, are admirably calculated for the peace and welfare both of individuals and society. The greatest liberality of mind, the greatest generosity of temper, the most unbounded love, and the greatest indifl’erence to the accumulation of this world’s property, if they glowed from breast to breast, and operated with equal force on all men, would be productive of equal good and happiness to all. We are scarcely able to perceive the force of this at first view, because the deceit and imposition which yet exist in the world, prevent the operation of the best principles even in the best hearts. But in proportion to the improvement of mankind, what is their real in¬ terest, and what are the real objects of happiness, will gradually untold. The contempt of vice Avill be great¬ er in proportion to the scarcity of it: for one villain gives countenance and support to another, just as iron sharpeneth iron. This opens to our view another fact connected with the practice of Christianity, namely, that the nearer it arrives to its perfect state, it will be the more rapid in its progress. The beauty of holiness wi 11 be more visible ; and, in the strong language of the prophet, “ the earth shall bring forth in one day, Pp. Ini. 8. and a nation shall be born at once*.” This future perfection of the gospel is consistent with its nature and importance.—-We can scarcely believe that means so admirably adapted to the reformation of mankind should be without their effect; and if the most difficult part be already accomplished, we have no reason to ap¬ prehend that the scheme will not be completed. This tact is also clearly the subject of ancient prophecy. For s “ I'’ “thus saith the Lordt, t will extend peace to her like a river, and the glory of the Gentiles like a flowing stream. And it shall come to pass, from one sabbath to another, and from one new moon to another, shall all flesh come to worship before me, saith the Lord.”— “ Violence shall be no more heard in thy land, wasting nor destruction within thy border ; but thou shalt call Millcn- thy walls salvation, and thy gates praise.” (Is. lx. 18.). nium Without entering more minutely on the prophecy Mdlepora. already quoted from chap. xx. of the book of the Re- velation, it is sufficient to observe, that Dr Whitby, in his treatise on the millennium at the end of his commen¬ tary, proves, in the clearest manner, from the spirit of the passage and the similarity of the expressions with those of other prophets, that it refers to a state of the church for a thousand years, which shall he like life from the dead. The commencement of this period is connected with two events : the fall of antichrist, and the conversion of the Jews. The latter of these events must be considered as a key to all the prophecies con¬ cerning the millennium. As the Jews were the ancient people of God, and as their conversion is to be the pre¬ vious step to the general knowledge of Christianity, the prophecies of the millennium have a chief relation to this important event. We have already observed, that God never interposes with miraculous power to produce what can be effected by natural means; and from what we know of human nature, we cannot but perceive that the conversion of the Jews will powerfully operate to the general conversion of mankind. Freed from those pre¬ judices which now make them the objects of hatred in all nations, and fired with that zeal by which new con¬ verts are always actuated, they will preach the gospel with a fervour of which we, who have long been bles¬ sed with its rays, can hardly form a conception; and, by their present dispersion over the whole earth, they will be enabled to adapt their instructions to every in¬ dividual of the human race in the language of his fa¬ thers. Indeed, if they are not at some future period to be employed by Providence for this purpose, it is diffi¬ cult, if not impossible, to give any reason for their dis¬ persed state and political existence. Just now it must be confessed that they are the most implacable enemies of the Christian name; but their conversion is not on that account more unlikely or improbable than were events which have taken place of nearly equal importance a very few years ago. On the whole, the perfection of Christianity is a doctrine of reasonable expectation to the church; and it is impossible for the advocates for natural religion to deny, that unlimited obedience to its precepts is consistent with the purest state of liberty' and of happiness. This is the only millennium which the prophets and apostles, as we understand them, pro¬ mise to the saints ; but as men figuring in the very first ranks of learning have thought otherwise, we Avould not be too confident that our interpretation is just.—Such of our readers as wish for further information, will find it in the works of Mr Mede, Bishop Newton, Dr Whit¬ by and Dr Gill; and to those masterly writers We refer them for that satisfaction which in such an article as this cannot be given. MILLEPES, or Wood-louse ; a species of Onis- eus. See Entomology Index. MILLEPORA, in Hatural History, a name by which Linnaeus distinguishes that genus of lithophytes, of a hard structure and full of holes, which are not stel¬ lated or radiated, and whose animal is the hydra, in which it differs from the madrepora, and comprehend¬ ing 14 different species. In the millepora, the animal which forms and inha¬ bits it occupies the substance ; and it is observed that O Z the MIL [108] MIL Millepora the milleporae grow upon one another •, their little ani- 11 mals produce their spawn *, which attaching itself either , billot, to the extremity of the body already formed, or un- v derneath it, gives a different form to this produc¬ tion. Hence the various shapes of the millepora, which is composed of an infinite number of the cells of those little insects, which all together exbibit differ¬ ent figures, though every particular cellula has its essen¬ tial form, and the same dimensions, according to its own species. MILLET. See Milium, Botany Index. MILLIARE, or Milliarium, a Roman mile, which consisted of 1000 paces, mille passus, whence the name. MILLIARIUM AUREUM, was a gilded pillar in the forum of Rome, at which all the highways of Italy met, as one common centre. From this pillar the miles were counted, and at the end of every mile a stone was put down. The milliary column was erected by Au¬ gustus Csesar, and, as we are informed by travellers, is still to be seen. MILLING of Cloth. See Fulling. MILLION, in Arithmetic, the sum of ten hundred thousand, or a thousand times a thousand. See Arith¬ metic. MILLO, a part of Mount Zion at its extremity •, and therefore called Millo of the city of David (2 Chron. xxxii.), taken in with the wall that encom¬ passed Mount Zion. Uncertain whether Beth Millo, ('Judges ix. 20.) denotes a place ; if it did, it lay near Sechem. MILLOT, Claude Francis Xavier, of the French academy, was born at Besan^on, March 1726, and was for some time a Jesuit, He was consecrated for the pulpit, and continued to preach after he left the society : But the weakness of his voice, his timidity, and the awkwardness of his manner, not permitting him to continue in this profession, he relinquished it, although he had preached Advent sermons at Versailles, and Lent sermons at Luneville. The marquis de Felino, minister of Parma, instituted an historical class for the benefit of the young nobility ; and, at the desire of M. le Due de Nivernois, he gave the charge of it to the abbe Millot. The minister having occasioned a kind of rebellion among the people by some innovations which he had made in the state, the abbe continued at¬ tached to the interests of his patron, and would not de¬ sert him till the storm was blown over. When he was told that he would lose his place by this conduct, he re¬ plied, “ My place is with a virtuous persecuted man who has been my benefactor and that I shall never lose.” At length, having filled the historical chair with great approbation, he returned to France, and was appointed preceptor to M. le Due d’Enghien. In this situation he died, A. D. 1785, aged 59. The abbd Millot did not shine in company; he was cold and re¬ served in his manner} but every thing he said was ju¬ dicious, and exactly in point.— D’Alembert said, that of all his acquaintance the abbe Millot had the fewest prejudices and the least pretension. He composed seve¬ ral works, which are digested with great care, and written in a pure, simple, and natural style. The prin¬ cipal are,. 1. Elemens de PHistoire de France, depuis Clovis jusqu"' a Louis XIV. 3 vols. in i2mo. The au¬ thor, selecting the most curious and important facts, has suppressed every thing foreign to the subject j and has Millot, not only Arranged the materials in their proper order, Milo.’ but chosen them with the greatest judgment. Querlon ’ r— thought this the best abridgement which we have of the history of France, and preferred it to that of the presi¬ dent Henault. 2. Elemens de PHistoire d'Angleterre depuis son origine sous les Remains, jusqu1 a George II. 3 vols. i2mo. In this valuable abridgement, the au¬ thor satisfies, without tiring, his readers. It is all that is necessary for those who wish to gain a general know¬ ledge of the English history, without entering minute¬ ly into its particular parts.—3. Elemens de PHistoire Universelle, 9 vols. i2mo. A certain critic maintains, that this work is merely a counterfeit of Voltaire’s ge¬ neral history. But this censure is altogether unjust. The ancient history in this work is wholly composed by the abbe Millot; and, no less than the modern part, discovers his abilities in the choice of facts, in divesting them of useless circumstances, in relating them without prejudice, and in adorning them with judicious reflec¬ tions. 4. LlHistoire des Troubadours, 3 vols. 12mo, compiled from the manuscripts of M. de Saint Palaie. This work appears rather tedious, because it treats of men almost unknown, and most of them deserving to be so. What is there quoted from the Provencal poets is not at all interesting 5 and, according to the observation of a man of wit, “ it serves no purpose to search curi¬ ously into a heap of old ruins while wre have modern palaces to engage our attention.” 5. Menioires Poli- tiques et Militairespour servir a PHistoire deLomsXIV, et de Louis XV. composed from original papers collect¬ ed by Adrian Maurice due de Noailles, marshal of France, in 6 vols. i2mo. 6. The abbe Millot pub¬ lished also several Discourses, in which he discusses a variety of philosophical questions, with more ingenuity of argument than fire of expression *, and a translation of the most select harangues in the Latin historians } of which it has been remarked, as w7ell as of the orations of the abbe d’Olivet, that they are coldly correct, and elegantly insipid. The character of the author, more prudent and circumspect than lively and animated, sel¬ dom elevated his imagination above a noble simplicity without warmth, and a pure style without ostentation. Some of the critics, however, have accused him of.de- clamation in some parts of his histories, particularly in those parts which concern the clergy. But, in our opi¬ nion, the word declamation is totally inapplicable to the writings of the abbe Millot. He flatters, it is true, neither priests nor statesmen •, and he relates more in¬ stances of vicious than virtuous actions, because the one are infinitely more common than the other: But he re¬ lates them coldly •, and he appears to be guided more by sincerity and a love of truth, than by that partial philosophy which blames the Christian religion for those evils which it condemns. MILO, a celebrated athlete of Crotona in Italy. H is father’s name was Diotimus. He early accustomed himself to carry the greatest burdens, and by degrees^ became a prodigy of strength. It is said that he car¬ ried on his shoulders a young bullock, four years old, for above forty yards 5 and afterwards killed it with one blow of his fist, and eat it up in one day. He was se¬ ven times crowned at the Pythian games, and six at the Olympian. He presented himself a seventh time y but no one had the courage or boldness to enter the lists- against M I L j)0, against him. He was one of the disciples of Pythago¬ ras ; and to his uncommon strength, it is said, the learned preceptor and his pupils owed their life: The pillar which supported the roof of the school suddenly gave way ; but Milo supported the whole weight of the building, and gave the philosopher and his auditors time to escape. In his old age, Milo attempted to pull up a tree by the roots, and break it. He partly eft’ected it 5 but his strength being gradually exhausted, the tree when half cleft re-united, and his hands remained pinch¬ ed in the body of the tree. He was then alone j and, being unable to disentangle himself, he was devoured by the wild beasts of the place, about 500 years before the Christian era. Milo, T. Annius, a native of Lanuvium, who at¬ tempted to obtain the consulship at Rome by intrigue and seditious tumults. Clodius the tribune opposed bis views *, yet Milo would have succeeded but for the following event: As he was going into the country, at¬ tended by his wife and a numerous retinue of gladiators and servants, he met on the Appian road his enemy Clodius, who was returning to Rome with three of his friends and some domestics completely armed.—A quarrel arose between the servants. Milo supported his attendants, and the dispute became general.—Clodius received many severe wounds, and was obliged to re¬ tire to a neighbouring cottage. Milo pursued his ene¬ my in his retreat, and ordered-his servants to despatch him. The body of the murdered tribune was carried to Rome, and exposed to public view. The enemies of Milo inveighed bitterly against the violence and bar¬ barity with which the sacred person of a tribune had been treated. Cicero undertook the defence of Milo j but the continual clamours of the friends of Glodius, aad the sight of an armed soldiery, which surrounded the seat of judgment, so terrified the orator, that he forgot the greatest part of his arguments, and the de¬ fence be made was weak and injudicious.—Milo was condemned, and banished to Massilia. Cicero soon af¬ ter sent his exiled friend a copy of the oration which he had prepared for his defence, in the form in which we have it now ; and Milo, after he had read it, ex¬ claimed, 0 Cicero, hadst thou spoken before my accusers in these terms, Milo would not be now eating Jigs at Marseilles. The friendship and cordiality of Cicero and Milo were the fruits of long intimacy and familiar in¬ tercourse. It was to the successful labours of Milo that the orator was recalled from banishment, and restored to his friends. Milo, (anciently Melds), an island in the Archipe¬ lago, about 50 miles in circumference, with a harbour, which is one of the largest in the Mediterranean. The principal town is of the same name as the island, and was prettily built, but abominably nasty: the houses are two stories high, with flat roofs j and are built with a sort of pumice stone, which is hard, blackish, and yet very light. This island was formerly rich and populous. From the earliest times of antiquity it enjoyed pure liberty. M I L The Athenians, not being able to persuade the Melians mp0. to declare in their favour in the Peloponnesian war, l—y—— made a descent upon the island, and attacked them vi¬ gorously. In two different expeditions they failed of their purpose : but returning with more numerous forces, they laid siege to Melos ; and obliging the besieged to surrender at discretion, put to the sword all the men who were able to bear arms. They spared only the women and children, and these they carried into captivity. This act of cruelty puts humanity to the blush, and disgraces the Athenian name. But war was then carried on with a degree of wild rage, unex¬ ampled in the present times. Republics know not how to pardon, and always carry their vengeance to an extravagant height. When Lysander, the Lacedae¬ monian general, came to give law to the Athenians, he expelled the colony which they had sent to Melos, and re-established the unfortunate remains of its origi¬ nal inhabitants. This island lost its liberty when Rome, aspiring to the empire of the world, conquered all the isles of the Archipelago. In the partition of the empire, it fell to the share of the eastern emperors, was governed bv particular dukes, and was at last conquered by Soli- man If. Since that period, it has groaned under the yoke of Turkish despotism, and has lost its opulence and splendour. At the commencement of the present century, it boasted of 17 churches and 11 chapels, and contained more than 20,000 inhabitants. It was very fertile in corn, wine, and fruits ; and the ivhole space from the town to the harbour, which is nearly two miles, was laid out in beautiful gardens. M. Tourne- fort, who visited it in the year 1700, gives a fine de¬ scription of it. “ The earth, being constantly warmed by subterraneous fires, produced almost without inter¬ ruption plenteous crops of corn, barley, cotton, ex¬ quisite wines, and delicious melons. St Elias, the finest monastery in the island, and situated on the most ele¬ vated spot, is encircled with orange, citron, cedar, and fig trees. Its gardens are watered by a copious spring. Olive trees, of which there are but few in the other parts of the island, grow in great numbers around this monastery. The adjacent vineyards afford excellent rvine. In a word, all the productions of the island are the very best of their kinds ; its partridges, quails, kids, and lambs, are highly valued, and yet may be bought at a very cheap price.” Were M. Tournefort to return to Milo, M. Savary * * Letters assures us, he would no longer see the fine island which he has described. “ He might still see alum, in the form of feathers, and fringed with silver thread, hang¬ ing from the arches of the caverns 5 pieces of pure sulphur filling the cliffs of the rocks ; a variety of mi¬ neral springs •, hot baths (though these are now only a set of small- dirty caves) ; the same subterraneous fires which in his days warmed the bosom of the earth, and were the cause of its extraordinary fertility : but instead of 5000 Greeks* all paying the capitation tax (a), he would now find no more than about 700 inhabitants [ 109 ] (a) Grown up men are the only persons who pay the capitation tax. Therefore, by adding to the number of cooo who paid the tax, the women, boys, and girls, we find that Melos, in the days of Tournefort, contained at feast 20,000 souls. MIL [ii Milo. inhabitants on an island 18 leagues in circumference. He would sigh to behold the finest lands lying unculti¬ vated, and the most fertile valleys converted into mo¬ rasses ; of the gardens scarcely a vestige is left j three- fourths of the town in ruins, and the inhabitants daily decreasing. In short, during the last 50 years, Melos has assumed a quite different appearance. The plague, which the Turks propagate everywhere, has cut oft one part of its inhabitants $ the injudicious admini¬ stration of the Porte, and the oppressive extortions of the captain pacha, have destroyed the rest. At pre¬ sent, for want of hands, they cannot cut out a tree channel for their waters, which stagnate in the valleys, corrupt, and infect the air with their putrid exhala¬ tions. The salt marshes, of which there are numbers in the island, being equally neglected, produce the same effects. Add to these inconveniences, those sul¬ phureous exhalations which arise all over the island, and by which the inhabitants of Melos are afflicted with dangerous fevers during three-fourths of the year. Perhaps they may be obliged to forsake their coun¬ try. Every countenance is yellow, pale, and livid ; and none bears any marks of good health. Ihe pru¬ dent traveller will be careful to spend but a very short time in this unwholesome country, unless he chooses to expose himself to the danger of catching a fever. To sleep over night, or to spend but one day in the island, is often enough to occasion his being attacked with that distemper. “ Yet (continues our author) a judicious and en¬ lightened government might expel those evils which ravage Melos. Its first care wmuld be to establish a la¬ zaret, and to prohibit vessels whose crews or cargoes are infected with the plague from landing. Canals might next be cut, to drain the marshes whose exhala¬ tions are so pernicious. The island w'ould then be re¬ peopled. The sulphureous vapours are not the most noxious. These prevailed equally in ancient times, yet the island was then very populous. M. Tournefort, . who travelled through it at a time less distant from the period when it was conquered by the Turks, and when -they had not yet had time to lay it waste, reckons the number of its inhabitants (as we have said) at about 20,000. The depopulation of Melos is therefore to be ascribed to the despotism of the Porte, and its detestable police.” The women of Milo, once so celebrated for their Tour beauty, are now sallow, unhealthy, and disgustingly up the ugly i an(l render themselves still more hideous by their Straits, dress, which is a kind of loose jkcket, with a white coat :p. 146. and petticoat, that scarcely covers two-thirds of their thighs, barely meeting the stocking above the knee. Their hind hair hangs down the back in a number of plaits ; that on the fore part of the head is combed down each side of the face, and terminated by a small stiff curl, which is even with the lower part of the cheek. All the inhabitants are Greeks, for the Turks are not fond of trusting themselves in the small islands $ but every summer the captain bashaw goes round with a squadron to keep them in subjection, and to collect the revenue. When the Russians made themselves mas¬ ters of the Archipelago, many of the islands declared in their favour •, but being abandoned by the peace, they were so severely mulcted by the grand signior, that they have professed a determination to remain perfectly o ] MIL / quiet in future. As the Turks, however, do not think Wite them 'worth a garrison, and will not trust them with || arms and ammunition, all those which the Russians may Mhtiadei. choose to invade will be obliged to submit. The two points which form the entrance of the harbour, cros¬ sing each other, render it imperceptible until you are close to it. Thus, while you are perfectly secure within it, you find great difficulty in getting out, par¬ ticularly in a northerly wund } and as no trade is car¬ ried on except a little in corn and salt, Milo would scarcely ever be visited, were it not that, being the first island which one makes in the Archipelago, the pilots have chosen it for their residence. They live in a little toivn on the top of a high rock, which, from its situation and appearance, is called the Par¬ tridges still abound in this island ; and are so cheap, that you may buy one for a charge of powder only. The peasants get them by standing behind a portable screen, with a small aperture in the centre, in which they place the muzzle of their piece, and then draw the partridges by a call. When a sufficient number are collected, they fire among them, and generally kill from four to seven at a shot; but even this method of getting them is so expensive, from the scarcity of am¬ munition, that the people can never afford to shoot them, except when there are gentlemen in the island, from whom they can beg a little powder and shot. Milo is 60 miles north of Candia ; and the town is situated in E. Long. 25. 15. N. Lat. 36. 27. MILSTONE. See Millstone. - MILT, in Anatomy, a popular name for the Spleen. Milt, or Melt, in Natural History, the soft roe in fishes j thus called from its yielding, by expression, a whitish juice resembling milk. See Roe. The milt is properly the seed or spermatic part of the male fish. The milt of a carp is reckoned a choice bit. It consists of two long whitish irregular bodies, each in¬ cluded in a very thin fine membrane. M. Petit consi¬ ders them as the testicles of the fish wherein the seed is preserved j the lower part next the anus, he supposes to be the vesiculcB seminales. MILTHORP, a port town of Westmoreland, at the mouth of the Can, eight miles south from Kendal. It is the only sea port in the county } and goods are brought hither in small vessels from Grange in Lan¬ cashire. Here are two paper mills. It has a market on Friday, and a fair on Old Maji day j and there is a good stone bridge over the river Betha, which runs through the town. Population 1016 in 1811. MILTIADES, an Athenian captain, son of Cyp- selus. He obtained a victory in a chariot race at the Olympic games. He led a colony of Athenians to the Chersonesus. The causes of this appointment are striking and singular. The Thracian Holonci, ha¬ rassed by a long war with the Absynthians, were di¬ rected by the oracle of Delphi to take for their king the first man they met in their return home, who in¬ vited them to come under his roof and partake his entertainments. This was Miltiades, whom the ap¬ pearance of the Dolonci, with their strange arms and garments, had struck. He invited them to his house, and was made acquainted with the commands of the oracle. He obeyed $ and when the oracle of Delphi had approved a second time the choice of the Do¬ lonci, MIL [ i jades, lonci, he departed for the Chersonesus, and was in- vested by the inhabitants with sovereign power. The first measures he took, were to stop the further incur¬ sions of the Absynthians, by building a strong wall across the isthmus. When he had established himself at home, and fortified his dominions against foreign invasion, he turned his arms against Lampsacus. His expedition was unsuccessful j he was taken in an am¬ buscade, and made prisoner. His friend Croesus king of Lydia was informed of his captivity, and procured his release. He lived a few years after he had reco¬ vered his liberty. As he had no issue, he left his kingdom and possessions to Stefagoras the son of Ci- mon, who was his brother by the same mother. The memory of Miltiades was greatly honoured by the Dolonci, and they regularly celebrated festivals and exhibited shows in commemoration of a man to whom they owed their greatness and preservation. Miltiades, the son of Cimon, and brother of Ste¬ fagoras mentioned in the preceding article, was some time after the death of the latter, who died without issue, sent by the Athenians with one ship to take possession of the Chersonesus. At his arrival Mil¬ tiades appeared mournful, as if lamenting the recent death of his bi-other. The principal inhabitants of the country visited the new governor to condole with him j but their confidence in his sincerity proved fa¬ tal to them. Miltiades seized their persons, and made himself absolute in Chersonesus. To strengthen him¬ self, he married Hegesipyla, the daughter of Olorus the king of the Thracians. His triumph was short. Jn the third year of his government, his dominions were threatened by an invasion of the Scythian No- mades, whom Darius had some time before irritated by entering their country. He fled before them y but as their hostilities were of short duration, he was soon restored to his kingdom. Three years after, he left Chersonesus; and set sail for Athens, where he was received with great applause. He was present at the celebrated battle of Marathon ; in which all the chief officers ceded their power to him, and left the event of the battle to depend upon his superior abilities. He obtained an important victory over the more numerous forces of his adversaries. Some time after, Miltiades was intrusted with a fleet of 70 ships, and ordered to punish those islands which had revolt¬ ed to the Persians. He was successful at first, but a sudden report that the Persian fleet was coming to attack him, changed his operations as he was besieging Paros. He raised the siege, and returned to Athens. He was accused of treason, and particularly of hold¬ ing correspondence with the enemy. The falsity of these accusations might have appeared, if Miltiades had been able to come into the assembly. But a wound which he had received before Paros detained him at home j and his enemies, taking advantage of his absence, became more eager in their accusations, and louder in their clamours. He was condemned to death ; but the rigour of his sentence was retract¬ ed on the recollection of his great services to the A- thenians, and he was put into prison till he had paid a fine of 50 talents to the state. His inability to dis¬ charge so great a sum detained him in confinement j and his wounds becoming incurable, he died a pri¬ soner about 489 years before the Christian era. His 11] MIL body was ransomed by his son Cimon 5 who was obli- Miltiades, ged to borrow and pay the 50 talents, to give his father Milton, a decent burial.—The accusations against Miltiades v were probably the more readily believed by his coun¬ trymen, when they remembered how he made him¬ self absolute in Chersonesus 5 and in condemning the barbarity of the Athenians towards a general, who was the source of their military prosperity, we must remember the jealousy which ever reigns among a free and independent people, and how watchful they are in defence of the natural rights which they sec wrested from others by violence. Cornelius Nepos has written the life of Miltiades the son of Cimon ; but his history is incongruous and unintelligible, from his confounding the actions of the son of Cimon with, these of the son of Cypselus. Greater reliance is to be placed on the narration of Herodotus, whose ve¬ racity is confirmed, and who was indisputably better informed and more capable of giving an account of the life and exploits of men who flourished in his age, and ot which he could see the living monuments. Herodotus was born about six years after the famous battle of Marathon : and C. Nepos, as a writer of the Augustan age, flourished about 450 years after the age of the fa ther of history. MILTON, John, the most illustrious of the Eng¬ lish poets, was descended of a genteel family, seated at a place of their own name, viz. Milton, in Oxford¬ shire. He was born December 9. 1608, and received his first rudiments of education under the care of his parents, assisted by a private tutor. He afterwarda passed some time at St Paul’s school, London j in which city his father had settled, being engaged in the busi¬ ness of a scrivener. At the age of 17, he was sent to Christ’s college, Cambridge; where he made great progress in all parts of academical learning; but his chief delight was in poetry. In 1628, he proceeded bachelor of arts, having performed his exercise for it with great applause. His father designed him for the church; but the young gentleman’s attachment to the Muses was so strong, that it became impossible to engage him in any other pursuits. In 1632, he took the de¬ gree of master of arts ; and having now spent as much time in the university as became a person who deter¬ mined not to engage in any of the three professions, he left the college, greatly regretted by his acquain¬ tance, but highly displeased with the usual method of training up youth there for the study of divinity; and being much out of humour with the public administra¬ tion of ecclesiastical affairs, he grew dissatisfied with the established form of church government, and disliked the whole plan of education practised in the university. His parents, who now dwelt at Horton, near Coin- brook, in Buckinghamshire, received him with una¬ bated affection, notwithstanding he had thwarted their views of providing for him in the church, and they amply indulged him in his love of retirement; wherein he enriched his mind with the choicest stores of Gre¬ cian and Roman literature; and his poems of Comus, PAllegro, Jl Penseroso, and Lycidus, all wrote at this time, would have been sufficient, had he never produ¬ ced any thing more considerable, to have transmitted his fame to the latest posterity. However, he was net so absorbed in his studies as not to make frequent ex¬ cursions to London; neither did so much excellence , pass Mi! ton. M I L t n pass unnoticed among bis neighbours in the country, with the most distinguished of whom he sometimes chose to relax his mind, and improve his acquaintance with the world as well as with books.—After five years spent in this manner, he obtained his father’s permission to travel for farther improvement. At Paris he became acquainted with the celebrated Hugo Gro- tius ; and from thence travelling into Italy, he was everywhere caressed by persons of the most eminent quality and learning. Upon his return home, he set up a genteel academy ig Aldersgate street.—In 1641, he began to draw his pen in defence of the Presbyterian party ; and the next year he married the daughter of Richard Powell, Esq. of Forest Hill in Oxfordshire. This, lady, however, whether from a dift'erence on account of party, her father being a zealous royalist, or some other cause, soon thought proper to return to her relations; which so incensed her husband, that he resolved never to take her again, and wrote and published several tracts in defence of the doctrine and discipline of divorce. He even made his addresses to another lady ; but this in¬ cident proved the means of a reconciliation with Mrs Milton. In 1644, he wrote his Tract upon Education ; and the restraint on the liberty of the press being continued by act of parliament, he wrote boldly and nobly against that restraint. In 1645, he published his juvenile poems j and about two years, after, on the death of his father, he took a smaller house in High Holborn, the hack of which opened into Lincoln’s- Inn Fields.-r-Here he quietly prosecuted his studies, till the fatal catastrophe and death of Charles I. ; on which occasion he published his Tenure of Kings and Magistrates, in justification of the fact. He was now taken into the service of the commonwealth, and made Latin secretary to the council of state, who resolved neither to write to others abroad, nor to receive any answers, except in the Latin tongue, which was com¬ mon to them all. The famous Eucav BxcnAtxr, coming out about the same time, our author, by command, Avrote and published his Iconoclastes the same year. It was also by order of his masters, backed by the re¬ ward of 1000I. that in 1651 he published his cele¬ brated piece, entitled Pro Popula Anglicano T)efen- sio; “ A. Defence of the people of England,” in an¬ swer to Salmasius’s Defence of the King; which per¬ formance spread his fame over all Europe. He now dwelt in a pleasant house with a garden, in Petty France, Westminster, opening into St James’s Park. In 1652 he buried his wife, who died not long after the delivery of her fourth child ; and about the same time he also lost his eye-sight, by a gu-lta serena, which had been growing upon him many years. Cromwell took the reins of government into his own > hand in the year 1-653 ; but Milton still held his of¬ fice. His leisure hours he employed in prosecuting his studies; wherein he was so far from being discouraged by the loss of his sight, that he even conceived hopes this misfortune would add new vigour to his genius ; which in fact seems to have been the case.—■Thus animated, he again ventured upon matrimony : his se¬ cond lady was the daughter of Captain Woodstock of Hackney : she died in childbed about a year after. , On the deposition of the protector, Richard Crom- , 2 2 ] MIL well, and on the return of the long parliament, Milton Milton being still continued secretary, he appeared again in —H print ; pleading for a farther reformation of the laws relating to religion; and, during the anarchy that en¬ sued, he drew up several schemes for re-establishing the commonwealth, exerting all his faculties to prevent the return of Charles IL England’s destiny, however, and Charles’s good fortune prevailing, our author chose to consult his safety, and retired to a friend’s house in Bartholomew Close. A particular prosecution was in¬ tended against him; but the just esteem to which his admirable genius and extraordinary accomplishments entitled him, bad raised him so many friends, even among those of the opposite party, that he was included in the general amnesty. This storm being over, he married a third wife, Eli¬ zabeth, daughter of Mr Minshall a Cheshire gentleman ; and not long after he took a house in the Artillery Walk, leading toBunhill Fields. This was his last stage: here he sat down for a longer continuance than he had been able to do anywhere ;, and though he had lost his fortune (for every thing belonging to him went to wreck at the Restoration), he did not lose his taste for literature, but continued his studies with almost as much ardour as ever.; and applied himself particularly to the finishing his grand work, the Paradise Lost; one of the noblest poems that ever was produced bv human genius. —It was published in 1667, and his Paradise Regained came out in 1670.—This latter work fell short of the excellence of the former production ; although, were it not for the transcendent merit of Paradise Lost, the second composition would doubtless have stood fore¬ most in the rank,of English epic poems. After this he ' published many pieces in prose ; for which we refer our readers to the edition of his Historical, Poetical, and Miscellaneous Works, printed by Millar, in 2. vols^to, ia-1753. In 1674, this great man paid the last debt to na¬ ture at his house in Bunhill Fields, in the 66th year of his age; and was interred on the 12th of Novem¬ ber, in the chancel of St Giles’s, Cripplegate.—A de¬ cent monument was erected to his memory, in 1737> ' in Westminster Abbey, by Mr Benson, one of the audi¬ tors of the imprest.—Milton was remarkably handsome ir) his person ; but his constitution was tender, and by no meana equal to his incessant application to hisstudies. Though greatly reduced in his circumstances, yet he died worth 1500I. in money, besides his household > goods.—He had. no son.; hut left behind him three daughters, whom he had by his first wife. Milton, the name of several places in England; particularly, Milton, or Middleton, in Dorsetshire, south-west of Blandford, near the road to Dorchester, 114 miles from London. It is chiefly noted for its abbey, built by King Athelstan. The church stands, near the south side of the abbey. It is a large and magnificent pile of Gothic architecture, and contains several ancient monuments. Here is an almshouse for. six people, who have 12s. a-week, and three yards of cloth for a gown, one pair of shoes and stockings, and 10s. each on St Thomas’s day yearly. Here is a free school, and a market on Tuesdays. Milton, in Kent, near Sittingbourn and the Isle of Sheppey, 6 miles north-west of Feversham, and 40 from M I M [ i Milton fr°m I-l011^on- It is also called Middleton from its si¬ ll tnation near the middle of the county, i. e. from Dept- tlimncr- foril to the Downs. The kings of Kent had a palace mils- here, which was castellated, and stood below the church j jjUj was |jUrnt down in Edward the Confessor’s time by Earl Goodwin, &c. Its church stands near a mile off. On approaching the town up the Thames, by the East Swale, it seems hid among the creeks: yet it is a large town j and has a considerable market on Sa¬ turdays, and a fair on J uly 24. The oysters taken here are the most famous of any in Kent. This town is governed by a portreeve, chosen yearly on St James’s day, who supervises the weights and measures all over the hundred. Population 2470 in 1811. Milton, in Kent, a mile on the east side of Graves¬ end, was incorporated with it in the reign of Queen Elizabeth, by the name of the portreeve, jurats, and inhabitants of the towns of Gra%resend and Milton. King Henry VIII. raised a platform or blockhouse here, for the defence both of this town and Graves¬ end, and the command of the river. It has a fair, Ja¬ nuary 25. MILVIUS, Molvius, or Mulvius, Pons; a bridge on the Tiber, built by TEmilius Scaurus the censor, in the time of Sylla, at two miles distance from the city, on the Via Flaminia, and repaired by Augus¬ tus. From this bridge the ambassadors of the Allobro- ges were brought back to Rome, by Cicero’s manage¬ ment, and made a discovery of Catiline’s conspiracy (Sallust). Near it Maxentius was defeated by Con¬ stantine (Eutropius). Now called Ponte Mode. Milvius, a species of Falco. See Falco, Or¬ nithology Index. MIMI, Mimes, in the ancient comedy, were buf¬ foons or mimics, who entertained the people by taking off certain characters, using such gestures as suited the persons or subjects they represented. There were on the Roman stage female performers of this kind, called mimee. The word is derived from pipiapcu, I imitate. Some of the mimi acted their parts to the sound of the tibia ; these they called mimauH. Mimi were also a kind of farces or ludicrous come¬ dies, generally performed by one person.. They had no acts, nor any exordium.—The mimi were, introduced upon the Roman stage long after comedv and tragedy had arrived at their full perfection. The actor wore no mask, but smeared his face with soot, was dressed in lambskin, wore garlands of ivy, and carried a basket of flowers and herbs, in honour of Bacchus, and di¬ verted the audience with apish tricks and ridiculous dances. This was the state of the mimi soon after their first introduction j but they underwent lYiany altera¬ tions, which it would take up too much room to relate, and which are not of sufficient importance to justify a detailed account. See PANTOMIMES. MIMESIS, in Rhetoric, the imitating the voice and gestures of another person. MIMNERMUS, an ancient poet and musician, flourished about the beginning of the sixth century B. C. He was of Smyrna, and cotemporary with Solon. A- thenaeus gives him the invention of pentameter verse. His elegies, of which only a few fragments are pre- § served, were so much admired in antiquity, that Ho¬ race preferred them to those of Callimachus. He com¬ posed a poem of this kind, as we learn from Pausanias, Vol. XIV. Part I. 3 ] MIN upon the battle fought between the people of Smyrna, Mirauer and the Lydians under Gyges. He likewise was au- mus thor of a poem in elegiac verse, quoted by Strabo, Mina||lls,]u which he entitled Nanno, and in which we may sup- ‘1 nim ' pose he chiefly celebrated a young and beautiful girl of that name, who, according to Athenaius, was a player on the flute, with whom he was enamoured in his old age. With respect to love matters, according to Pro¬ pertius, his verses were more valuable than all the writings of Homer. Plus in amore valet Mimnermi versus Homero. Lib. I. Eleg. ix. v. ir. And Horace bears testimony to his abilities in describ¬ ing that seducing passion : Si Mimnermus uti ccnset, sine amoi'e jocisque Nil est juciindum, vivas in amore jocisque. Lib. I. Epist. vi. v. <5.5- If, as wise Mimnermus said, Life unblest with love and joy Ranks us with the senseless dead, Let these gifts each hour employ. Alluding to some much admired lines of the Greek poet, which have been preserved by Stobaeus. Ti? $e fites, ti riQTrvov atrjjg XZv. Alternate oblique angular, as in copper pyrites. d. Unequiangular, as in the hexagonal table of preh- nite. C. Angles of the summit, which are confined to the pyramid, and present the following varieties. a. Very obtuse, when the angle is from 150° to 130°, as in tourmalin. b. Obtuse, when the angle is from 130° to no0, as in calcareous spar. c. Rather obtuse, from no0 to 90°, as in honey stone. d. Rectangular, as in zircon. e. Rather acute, from 90®, to 70°, as in quartz. f. Acute, from 70° to 5©0, as in calcareous spar. g. Very acute, from 50° to 30°, as in sapphire. 6. The direction of the lateral planes. These are ei¬ ther straight or curvated. A. Straight planes are even surfaces, and are the most common. B. Curvated planes are distinguished according to position and form. a. Position, which is, u. Inwardly curvated or con¬ cave $ or, |S. Outwardly curvated or convex j and, y. Inwardly and outwardly curvated, or concave and con¬ vex. The first is observed in fluor spar, the second in diamond, and the third in sparry iron stone. b. The form is either, <*. Spherical, as in broivn spar; /3. Cylindrical, in which the curvature runs, 1. Parallel to the sides, as in iron pyrites, or, 2. Pa¬ rallel to the diagonal, as in fluor spar $ and, y. Conical, as in gypsum. 7. The fulness of the crystal. Crystals are either full and perfect, or hollowed at the extremity, or through¬ out. A. Full or perfect crystals, which is most commonly the case. B. Hollowed 'art I. lassifica- tisn. MINERALOGY. B. Hollowed at the extremity, as in calcareous spar, green lead ore, &c. C. Hollow through the whole crystal, as in prisma¬ tic beryl. /3. Modifications of the primary form. The changes or alterations which take place on the principal or fundamental form, are three j truncation, bevelling, and acumination. I. Truncation. In the truncation are to he con¬ sidered the parts and the determination. 1. The parts of the truncation are the planes, the edges, and the angles. 2. The determination of the truncation relates to, a. The situation as it occurs at the angles or edges of the primary form. b. Its magnitude, which, in relation to the planes of the primary form, is small or large : in the one case the angles or edges are said to be slightly, in the other deeply truncated. c. The application of the truncation, which is either direct or oblique. The edges of cubical iron pyrites afford an example of oblique truncation. d. The direction of the truncation, which presents either an even or a curvated surface. Cubical galena, with truncated angles j tetrahedral prismatic tin stone crystals, with truncated edges j double tetrahedral pyramidal tin stone crystals, with truncated edges, are instances of truncation. II. Bevelling, in which the parts and determina-* tion are also to be considered. 1. The parts of the bevelling are, the planes, the edges, and the angles. The bevelling edges are di¬ stinguished into the proper bevelling edge, which is formed by the conjunction of the bevelling planes, and the bevelling edges formed by the junction of the bevel¬ ling planes with the lateral planes of the primary form. 2. The determination of the bevelling, in which is to be observed, A. Its situation as it takes place, a. At the extreme planes, which is confined to the prism and table j b. At the edges, which is met with in the hexahedron, prism, pyramid, and table: and, c. At the angles, which is a very rare occurrence. B. Its magnitude, which is said to be slight or deep. C. The angle under which the bevelling planes con¬ join, which is said to be, a. Acutely, b. Rectangularly, or, c. Obtusely bevelled. I). The continuation of the bevelling, which is ei¬ ther uninterrupted, or interrupted. Of the latter case there are two varieties, when it is once or twice inter¬ rupted. The lateral edges of double trihedral pyrami¬ dal calcareous spar are once interruptedly bevelled ; and the obtuse extreme edges of quadrangular tabular heavy spar, are twice interruptedly bevelled. E, The application, a. Of the bevelling itself, which is either direct or oblique (the former is the most com¬ mon, and the latter occurs in prismatic basaltic horn¬ blende) j and, b. Of the bevelling planes, which are set, either on the lateral planes, or on the lateral edges. III. The acumination, in which are also to be considered the parts of the acumination and the deter¬ mination. i. The parts of the acumination consist of, A. The acuminating planes. B. The acuminating edges *, which are distinguished into, a. Proper edges of acumination, formed by the junction of the acuminat¬ ing planes $ b. The extreme edges of acumination •, c. The edges between the acuminating and lateral planes. C. The angles of acumination. 2. The determination of the acumination relating to, A. Its situation, as it occurs at a. The solid angles; or, b. At the extreme planes of the primary form. The acumination of the prism is always at the extreme planes j of the cube usually at the angles, and of the pyramid generally at the summit. B. The planes themselves, in which are to be ob¬ served, c. Their number, which is either equal to, or fewer than those of the primary form. In the hexahedral prism of calcareous spar and garnet, and in the trihedral prism of tourmaline, the acumination is by three planes \ in the tetrahedral prism of jargon and hyacinth, by four planes j in the hexahedral prism of calcareous spar and rock crystal, by six planes j and in tetrahedral prisma¬ tic topaz,, by eight planes. b. Their relative size, which is either equal or un¬ equal. In quartz and rock crystal, the planes of acu¬ mination are generally indeterminately unequal j and in heavy spar they are determinately equal. c. Their form, which is determinate, as in hyacinth and calcareous spar } or indeterminate, as in jargon and Wolfram. d. Their application, which is either on the lateral planes of the primary form, as in jargon and hyacinth, or on the lateral edges, as in calcareous spar and garnet. C. The summit of the acumination, which is, a. Ob¬ tuse, as in hexahedral prismatic garnet $ b. Rectangu¬ lar, as in tetrahedral prismatic jargon j or, c. Acute, as in hexahedral prismatic calcareous spar. D. The magnitude of the acumination, which is said to be, a. Slightly acuminated, as in gray copper ore and copper pyrites 5 or, b. Deeply, as in fiuor spar, with the angles acuminated by 6 planes. E. Determination of the acumination ; which is ei¬ ther a point or a line. The first is the most common ; and the last is met with in prismatic white lead ore and heavy spar. y. Manifold modifications of the primary form. In these modifications crystals are either, I. Situated beside each other j or, 2. Placed the one above the other. But in describing a crystallization, the number of its planes in general, and of each kind in particular, and their figure, if determinate, may be noticed, to render the description more accurate. As, for instance, cubi¬ cal galena, with truncated angles, consist of 6 octan¬ gular and 4 triangular planes. And still farther, in explaining the form of crystal¬ lizations, by way of addition may be mentioned, i. The different modes of determination of which they are capable. Two different modes may in some cases be adopted. a. The representative, by which is understood the description of a crystallization according to its apparent form 5 or, b. The derivative, which is founded on the conside¬ ration of its derivation, and its relation to the other crystals of the same mineral. The prismatic crystalli¬ zation of the tourmaline is representatively anenneahe- S 2 dral MINERALOGY. Part dral prism, and derivatively a trihedral prism, with the three lateral sides bevelled. But, in general, the chief or essential form of a cry¬ stallization is determined by, a. The largest planes ; b. The greatest regularity; c. The most frequent oc¬ currence of the crystallizations 5 d. The affinity to the other primary forms ; e. The suitableness and peculia¬ rity of its modifications •, and,yi The greatest simplici¬ ty in the mode of determination. 2. The transitions from one primary form into an¬ other. These arise, a. From the gradually increased extent of the mo¬ difying planes, and the decreased extent of the primary planes 5 or, b. From a change in the relative size of the planes} ®r> c. From a change in the angles under which the planes are associated ; or, d. From the convexity of the planes ; or, e. From the aggregation of crystals. 3. The difficulties which are opposed to the exact de¬ termination of crystals. These proceed, a. From their compression, some planes being uncommonly large or small; or, b. From their penetrating each other, as in tin-stone crystals 5 or, c. From their partial conceal¬ ment, as in feldspar, hornblende, and garnet} or, d. From their being broken, as often happens in the crystallization of precious stones j or, e. From their extreme minuteness. C. The aggregation of crystals. According to this, crystals are either, a. Single, in which case they are, <*. Loose or de¬ tached, as in precious stones, cubical iron pyrites, &c.; /3. Inhering or inlaying in another mineral, as feld¬ spar in porphyry 3 or, y. Adhering, as in quartz cry¬ stals 3 or, b. Aggregated, which are either regular or irregu¬ lar. <*. Regular or detei*minate 5 such are, 1. Twin cry¬ stals, as in staurolite or cross stone ; and, 2. Triple crystals, as in calcareous spar and ruby : but this is very rare. /3. Many singly aggregated crystals, are such crystals as are, 1. Heaped upon one another, as in calcareous and fluor spars 3 2. Adhering laterally, as in amethyst crystals 3 and, 3. Implicated one in the other, as in gray antimonial ore, and in the hexahedral prisms of calcareous spar. y. Many doubly aggregated crystals are distributed according to the form they assume 5 such as the follow¬ ing, are enumerated. 1. Scopiform, when aggregated, needle-like, and ca- pilliform crystals diverge from a common centre, as in zeolite, striated red cobalt ore, and capilliform py¬ rites. 2. Fasciform, which is composed of double scopiform, with a common centre, as in calcareous spar, zeolite, and prehnite. 3. Acicular or columnar. Elongated, equally thick prisms adhering laterally together, are of this descrip¬ tion, as in acicular heavy spar, and a variety of white lead ore. 4. In a row, like a string of pearls, as in pyramidal crystals of quartz. y. Bud-like, in simple pyramids whose bases are con¬ nected, and whose joints are directed towards each Classifier other, as in bud-like drusen of quartz. tion. 6. Globular, a casual aggregation, consisting mostly w“~v—' of tables or cubes, arranged in a globular form, as in octahedral iron pyrites. 7. Amygdaloid, when tbe tables are externally ac¬ cumulated, smaller upon smaller, as in heavy spar. 8. Pyramidal, which takes place chiefly m prisms nearly parallel, the summits inclining to each other 3 the central prism being the highest, as in calcareous spar. 9. Rosc-like, composed of thin tables, on whose late¬ ral planes others are assembled, and arranged in a rose¬ like appearance. D. The magnitude of crystals, which is deter¬ mined, a. According to the greatest dimension, as a. Of an uncommon size, in crystals which exceed two feet, as in quartz and rock crystal 3 /3. Very large, from two feet to six inches, as in rock crystal and calcareous spar 3 y. Large, from six to two inches, as in iron py¬ rites, fluor spar, and garnet 3 S. Of a middling size, from two inches to half an inch, which are very com¬ mon 3 s. Small, from half an inch to one-eighth of an inch, also very common 5 £. Very small, from one-eighth of an inch to such as may be distinguished by the na¬ ked eye, as in corneous silver ore, and very small tin stone crystals 3 »). Minute, whose form cannot be di¬ stinguished by the naked eye, as in native gold and green lead ore. h. According to relative dimensions, when compared with others 3 and this is distinguished into «. Short or low, and long or high 3 Broad and narrow, or lon- gated 5 y. Thick and thin, or slender; $. Needle-like and capilliform 3 8. Spicular, and £. Globular ortessular. 4. Extraneous external forms, or petrifactions, which are divided into petrifactions of animals, and petrifac¬ tions of vegetables. A. Petrifactions of animals, or zeolites, as a. Of the class mammalia, the parts of which com¬ monly found are the bones, the teeth, horns, and skele¬ tons. Such are the bones of the elephant and the rhino¬ ceros, which are found in Siberia, and the bones of the mammoth from North America. b. Of birds, petrifactions of which are very rare. Some skeletons of aquatic birds have been met with in limestone near Oening. c. Of amphibious animals, such as those of the tor¬ toise, found in the same vicinity as the bones of the ele¬ phant 3 of frogs and toads, in the swine stone of Oen¬ ing 3 and of an animal resembling a crocodile in alumi¬ nous shale near Whitby in Yorkshire. d. Of fishes, of which whole fishes, skeletons, and im¬ pressions, have been found in different places. e. Of insects, petrifactions of which are not very common, excepting insects, such as crabs, which have been frequently observed. f Of vermes, of which numerous petrifactions are found belonging to the orders testacea, Crustacea, and corallina or corals. B. Petrifactions of vegetables, which are less nume¬ rous in the mineral kingdom than those of animals. These are distinguished into, a. Petrified tvood, the most usual of which are pe¬ trifactions of the trunk, branches, or roots of trees, and commonly irt I. M I N E B assifica- commonly consisting of siliceous substances, as wood¬ men. stone, jasper, horn stone. ; b. Impressions of leaves and plants, which are not uncommon in the strata of coal countries, particularly in the shale, sand stone, the argillaceous iron stone, and the coal itself. II. The external surface, which is the. second particular generic character of solid minerals ; and this is, x. Uneven, having irregular elevations and depres¬ sions, as in calcedony. 2. Granular, when the elevations are small, round, and nearly equal, as in stalactitical brown haematites. 3. Dr'usy, having minute, prominent, equal cry¬ stals on the surface, as in iron pyrites and quartz crystals. 4. Rough, when the elevations are minute and almost imperceptible, as in cellular quartz. 5. Scaly, when the surface is composed of slender splinters like scales, as in chrysolite. 6. Smooth, as in haematites and fluor spar. 7. Streaked, which is either singly or doubly streaked. A. Singly streaked surfaces are, a. Transversely, as in rock crystals; b. Longitudi¬ nally, as in topaz and prismatic sborl j c. Diagonally, as in specular iron ore } and d. Alternately, as in iron pyrites. B. Doubly streaked, which is, a. Plumiformly, or like a feather, as in native silver and native bismuth 5 and, b. Rctifa'mly, as in gray cohalt ore. 8. Rugose. Of slight linear elevations, as in calce¬ dony. III. The external lustre, in which are to he determined, 1. The intensity of the lustre, which is distinguished into different degrees, as A. Resplendent, which is the strongest kind of lustre, as in native quicksilver, galena, and rock crystal. B. Shining, as in gray copper ore, heavy spar, and pitch-stone. C. Weakly shining, as in iron pyrites, fibrous gypsum, and garnet. D. Glimmering, as in earthy talc, in the fracture of flint, and of steatites. E. Dull, as in most friable minerals, as in earthy lead ore, mountain-cork, chalk, &c. 2. The kind of lustre, which is either common or metallic. A. The common lustre belongs chiefly to earthy stones and salts. It is distinguished into a. Glassy, as in quartz and rock crystal. b. Waxy or greasy, as in opal, and in yellow and green lead ores. c. Pearly, as in zeolite. d. Diamond, as in white lead ore and diamond. c. Semimetallic, as in mica and haematites. B. Metallic lustre, which is peculiar to metals and most of their ores, as native gold and native silver, cop¬ per pyrites, and galena. Appearance of the fracture.. Here, as in the external appearance, three kinds of A L O G Y. characters present themselves ; I. The internal lustre j II. The fracture ; III. The form of the fragment. I. The interned lustre, the characters of which are to be determined in the same manner as the external lustre. II. The fracture, which is either compact or jointed. 1. The compact fracture, which is distinguished into splintery, conchoidal, uneven, earthy, and hackly. A. Splintery, which is either a. Coarse splintery, as in quartz, prase, and jade ; or b. Fine splintery, as in hornstone and fine splintery limestone. B. Even, which happens in minerals that are usually opake, and have only a glimmering lustre, as in com¬ pact galena, calcedony, and yellow carnelian. C. Conchoidal, which is distinguished, a. According to the size, into large and small. b. According to the appearance, into perfect and imperfect; and c. According to the depth, into deep and flat. Flint, opal, jasper, and obsidian, afford examples of the conchoidal fracture. D. Uneven, which is either, a. Of a coarse grain, as in copper pyrites. b. Of a small grain, as in gray copper ore, and c. Of a fine grain, as in arsenical pyrites. E. Earthy, which is the common fracture in earths and stones, as in marl, chalk, limestone. F. Havkly, in which the fracture exhibits sharp points, which is peculiar to the metals, as in native gold and native copper. 2. The jointed fracture. This is divided into the fibrous, striated, foliated, and slaty. A. The fibrous fracture, in which are to be ob¬ served, a. The thickness of the fibres, as they are coarse, fine, or delicate, as gypsum, fine fibrous malachite, and in wood-tin-ore. b. The direction of the fibres, which are straight, As in red haematites, and gray antimonial ore ; or curved, as in black haematites, and fibrous rock salt. c. The position of the fibres, which is x. Parallel, as in rock salt and amianthus: /3. Diverging, which is, 1. Stelliform, as in black haematites, and fibi’ous zeolite ; or, 2. Scopiform, as in fibrous malachite : or y. Promis¬ cuous, as in gray antimonial ore. d. The length of the fibres, which is x. Long, as in gypsum and amianthus 5 or g. Short, as in red haema¬ tites. B. Striated, in which are to be considered, a. The breadth of the striae, which are, x. Narrow, as in azure copper ore ; g. Broad, as in actynolite and hornblende ; or y. Very broad, as in sapphire and zeo¬ lite. b. The direction of the striae, which is either,«. Straight, as in gray ore of manganese 5 or, g. Curved, as in zeolite and actynolite. c. The position of the striae, which is x. Parallel, as in asbestus and hornblende ; g. Diverging, which is dis¬ tinguished into stelliform, as in iron pyrites and zeo¬ lite, or scopiform, as in actynolite and limestone; or y. Promiscuous, as in gray antimonial ore and actynolite. d. Length of the strive, as being x. Long striated, as in asbestus and gray antimonial ore j mg. Short striated, as in actvnolite. C, The 142 miner Classifica- C. The foliated fracture, in which arc to be deter- tion. mined, a. The magnitude of the folia, as being Large fo¬ liated, as in mica and specular gypsum. /3. Scaly foli¬ ated, which is distinguished into I. Coarse, 2. Small, and 3. Fine scaly foliated, as in micaceous iron ore and gypsum, y. Granularly foliated, which is distin¬ guished into 1. Gross, 2. Coarse, 3. Small, and 4. Fine granularly foliated, as in sparry iron ore, blende, and calcareous spar. h. The perfectness of the folia, as being a. Perfectly foliated, as in feldspar •, /3. Imperfectly foliated, as in topaz *, or, y. Concealed foliated, as in emerald. c. The direction of the folia, which is «. Straight, as in large foliated blende 5 or /3. Curved foliated. T he latter is distinguished into 1. Spherically curved, as in heavy spar ; 2. Undularly curved, as in talc ; 3. Peta- loidally curved, as in galena j or, 4. Indeterminately curved, as in mica and specular gypsum. d. The passage or cleavage of the folia, which is, «. According to the angle which one passage forms with another ; and this is either, 1. Rectangular, or, 2. oblique angular j or, /3. According to the number of the cleavages, and is •either, 1. A single cleavage, as in mica and talc j 2. A double cleavage, as in feldspar and hornblende } 3. A triple cleavage, as in calcareous spar and sparry iron ore *, 4. A quadruple cleavage, as in fluor spar •, 5. A sextuple cleavage, as in yellow, brown, and black blende. D. The slaty fracture, in which are to be deter¬ mined the thickness and direction of the lamellae. a. The thickness of the lamellae, which is either, «. Thick, or £. Thin slaty. b. The direction of the lamellae, as being either, •t. Straight, or /3. Curved slaty j the latter being dis¬ tinguished into 1. Undularly, or 2. Indeterminately curved. In some minerals -which possess distinct parts, two kinds of fracture may be observed. Thus, in fibrous gypsum, and in red and brown haematites, both the fibrous and foliated fracture appear j the fibres are then intersected by the folia under a certain angle. In to¬ paz, the transverse fracture is foliated, and the longitu¬ dinal fracture is concboidal. III. The form of the fragments, which is either re¬ gular or irregular. 1. Regular fragments, as when they are, A. Cubical, as in galena and rock salt. R. Rhomboidal, in which case the fragments are a. Specular on all the planes, as in heavy spar $ b. On four planes, as in feldspar and hornblende j and, r. On two planes, as in specular gypsum. C. Trapezoidal fragments, &c. D. Trihedral pyramidal fragments are rarely to be seen distinctly, excepting in fluor spar. D. Dodecahedral fragments, as in blende. 2. Irregular fragments, as when they are, a. Cuneiform, as in wood-tin-ore, and malachite. B. Specular, as in amianthus. C. Tabular, as in mica and talc. D. Indeterminate, which are the most common among solid minerals, and are distinguished into 3 A L O G Y. Part a. Very sharp edged, as in obsidian, common opal, classifk and rock crystal. bon. b. Sharp edged, as in hornstone and quartz. c. Moderately sharp edged, as in limestone. d. Rather blunt edged, as in steatites ; and e. Blunt edged, as in chalk and fullers earth. 3. The appearance of the distinct concretions. In determining this character, the form of the dis¬ tinct concretions, the surface of separation, and the lustre of separation, are to be considered. I. The form of the distinct concretions, which is either granular, lamellar, columnar, or pyramidal. 1. Granular, distinct concretions are distinguished, A. With respect to the form, into a. Round granular, which is either «e. Spherically round, as in roe stone and pisolite ; or f3. Lenticularly granular, as in argillaceous iron stone ; or y. Elongated round granular, as in quartz : and, b. Angularly granular, which is either «. Common, as in galena and calcareous spar *, or 0. Elongated an- nularly granular, as in hornblende and granular lime¬ stone. B. With regard to the size of the concretions. These are, a. Gross granular, as in zeolite and blende. b. Coarse granular, as in mica, galena, and piso¬ lite. c. Small granular, as in roe stone and garnet; and d. Fine granular distinct concretions, as in granular limestone and galena. 2. Lamellar distinct concretions. The differences to be observed here are, with respect to the direction or form, and the thickness. A. With respect to the direction or form, they are either, a. Straight lamellar : and again either quite straight, as in some galena and heavy spar 5 or foi'tification-like, as in some amethyst and calcedony. b. Curved lamellar, which is either indeterminate, as in galena and specular iron ore; reniform, as in fibrous malachite and native arsenic ; or concentric, which is either spherical concentric, as in calcedony and piso¬ lite, or conically concentric, as in some stalactites and haematites. B. With regard to the thickness, as being a. Very thick, the concretions exceeding one-half inch, as in amethyst and heavy spar. b. Thick, the concretions being between one-half and one-fourth inch, as in heavy spar and native ar¬ senic. c. Thin, between one-fourth and one-half inch, as in calcedony. d. Very thin, from a line to a thickness just percep¬ tible to the naked eye, as in specular iron. 3. Columnar distinct concretions, which are distin¬ guished with regard to the direction, thickness, form, and position. A. The direction, which is either, a. Straight columnar, as in schorl and calcareous spar, and, b. Curved columnar, as in argillaceous iron stone, and specular iron ore. B. The thickness is distinguished into, a. Very thick, when the diameter exceeds two inches, as in basalt and quartz. b. Thick lit I. ssifica- Thick columnar, from two inches to one-fourth |j:ion. inch, as in amethyst and calcareous spar. 'Hf""""' c. Thin, from one-fourth to onerhalf inch, as in cal¬ careous spar and argillaceous iron stone. d. Very thin, the thickness being less than a line, as in schorl and columnar argillaceous iron stone. C. The form of the concretions being either a. Perfectly columnar, as in argillaceous iron stone. b. Imperfectly, as in amethyst. c. Cuneiform columnar, as in calcai’eous spar and arsenical pyrites. D. The position of the concretions, which is either a. Parallel columnar, as in schorlite, or b. Diverging or promiscuous columnar, as in schorl and arsenical pyrites. 4. Pyramidal distinct concretions. This form of con¬ cretion is very rare, and has been observed only in the basalt of Iceland, Faro, and Bohemia. II. The surface of separation, which is distinguished into 1. Smooth, as in wood tin ore. 2. Bough, as in native arsenic. 3. Uneven, as in galena and blende j and ' 4. Streaked, which is either, A. Longitudinally streaked, as in schorl and schoidite. B. Transversely and fortification-like, as in amethyst and specular iron ore. III. The lustre of separation. This character is to be determined in the same manner as the external lustre. 4. The General Appearance. This comprehends three particular generic characters, the transparency, the streak, and the stain. 1. The transparency, which is distinguished into the following five degrees. 1. Transparent, which is either, A. Common, as when objects appear single thi'ough a transparent mineral j or, B. Doubling, when objects appear double, as in cal¬ careous spar, or double refracting spar, jargon, and chrysolite. 2. Semitransparent, as in opal and calcedony. 3. Translucent, as in flint, cat’s eye, and fluor spar. 4. Translucent at the edges, as in hornstone and fo¬ liated gypsum. 5. Opake, which is peculiar to minerals of a metayic lustre, as in malachite and jasper. II. The streak, which is either, 1. Of the same colour, or, 2. Different from that of the mineral, and whose lus¬ tre is the same j or, B. More or less different. In red silver ore the streak is a dark crimson red j in cinnabar, scarlet red ; in green lead ore, greenish- white ; in red lead ore, clear lemon yellow. III. The stain. With respect to this character, mi¬ nerals are distinguished into such as, 1. Simply stain, and this either strongly or weakly, as gray oi’e of manganese, and red scaly iron ox-e j and into such as 2. Both stain and mark, as chalk and plumbago j and 3. Such as do not stain. Characters for the Touch. Characters of this description are, hardness, soli- 143 dity, frangibility, flexibility, and adhesion to the Classifica- tongue. tion. I. The hardness, which is determined by the follow- v ing degrees. 1. Hard, as when a mineral gives fii’e with steel, but cannot be scraped with the knife. This character is distinguished into, A. Hard, when the file makes a considerable impres¬ sion, as in feldspar and schorl. B. Very hard, on which it makes a weak impression, as in rock crystal and topaz. C. Extremely hard, on which the file makes no im¬ pression, as diamond and emery. 2. Semihard may be slightly scraped with a knife, but gives no fire with steel, as red copper ore, blende, limestone. 3. Soft, easily scraped with the knife, as in galena, mica, asbestus. 4. \ ex-y soft, which receives an impression from the nail, as in gypsum, chalk, talc. H. The solidity, according to which solid minerals -are distinguished into, I. Brittle, when the particles are in the highest de¬ gree coherent and immoveable, as in quartz, gray cop¬ per ore, and copper pyrites- 2. Sectile, when the particles are coherent but not perfectly immoveable among one another, as in plum¬ bago and galena. 3. Malleable, when the integrant particles are cohe¬ rent and also more or less moveable among one another, as in the most of the native metals. III. The frangibility, with regard to which solid minerals are either, 1. Very difficultly frangible, as native metals, and massive common hornblende. 2. Difficultly frangible, as in prase, massive quartz, and asbestus. 3. Rather easily frangible, as iron pyrites, vitreous copper ore. 4. Easily frangible, as in galena, opal, and heavy spar. 5. Very easily frangible, as in amber and pitcoal. IV. The flexibility, according to which solid mine¬ rals are, 1. Flexible, which is distinguished into, A. Common, as in malleable minerals, amianthus, gold ore. B. Elastic, as in mica, elastic mineral pitch from Derbyshire. 2. Inflexible, such minerals as break when the direc¬ tion of the fibres is changed. V. The adhesion to the tongue, according to which some minerals possess this property 1. Strongly, as in hydrophane. 2. Rather strongly, as in bole and lithomai’ga. 3. Weakly, as talc. 4. Very weakly, as in clay. 5. No adhesion at all, as is the case with most mi¬ nerals. Characters for the Hearing. I. The sound, which is distinguished into 1. Ringing or sounding, as in native ax-senic and com¬ mon slate. 2. Creaking, as in native amalgam when pressed with the finger. 3. Rustling, mineralogy. [44 MINER Classifies.- 3. Rustling, as in passing the finger over mountain tiou. cork and farinaceous zeolite. ' r- * Particular generic characters of friable nunerals. The characters included under this title are the ex¬ ternal form, the lustre, the appearance of the particles, the stain and the friability. I. The external form, which is either massive, as in porcelain earth } interspersed, as in black silver ore j as a thick or thin crust, as in black copper ore ; spuvni- form, as in red and brown scaly iron ores 5 dendritic, as gray ore of manganese *, or rcniform, as pure clay and earthy talc. . • II. The lustre, which is determined as in solid mine¬ rals ; but here it is distinguished, 1. With regard to intensity, as A. Glimmering, as in earthy talc and scaly iron ore $ and, 13. Dull, as in earthy lead ore and lithomarga. 2. With regard to the kind, as it is common or me- 10 HI. The appearance of the particles, which is either, 1. Dusty, as in black copper ore, iron ochres. 2. Scaly, as in earthy talc. IV. The stain is distinguished in friable minerals as being either 1. Strong, as in scaly iron ore. 2. Weak, as in earthy lead ores. V. The friability, with regard to which friable mi¬ nerals are either, 1. Pulverulent, as earthy lead ores, and blue martial earth. . 2. Loosely coherent, as scaly iron ore and clays. 3. Particular generic characters of fluid minerals. These characters relate to the external form, the lustre, the transparency, the fluidity, and the wetting of the fingers. . . . , I. The external form, which is eitner, I. In globules j and, 2. Liquiform > both which cha¬ racters belong to native mercury. II. The lustre, which is determined as formerly ex¬ plained, and is either, 1. Common ; or, 2. Metallic, as in native mercury. III. The transparency, of which three degrees are distinguished in fluid minerals: 1. Transparent, as in naphtha ; 2. Turbid, as in petroleum 5 3. Opake, as in native mercury. . IV. The fluidity, which is characterised by being, I. Perfectly fluid, as mercury, and, 2. Cohesive, as in mineral tar. . V. The wetting of the fingers. 1. Some fluid minerals wet the fingers, as mineral tar j and, 2. Some do not, as native mercury. Remaining Common Generic Rxternal Characters. The remaining common generic characters are the unctuosity } the coldness 5 the weight 5 the smell j and til6 tjtst.0* - III. The unctuosity, of which there are four degrees, j. Meagre, as is the case with most minerals. 2. Rather greasy, as pipe clay. 3. Greasy, as fullers earth and steatites. 4. Very greasy, as talk and plumbago. _ IV. The coldness, which includes three degrees. 1. Cold, having the coldness of quartz, as hornstone, jasper, marble. 2. Rather cold, as serpentine, gypsum, A L O G Y. Part 3. Slightly cold, as amber, pitcoal, and chalk. _ Classifier jjy tilts character cut andpolished stones may be dis- tion. tinguished, where some of the other characters are lost;' v~ and bv it also natural gems may be distinguished from those which are artificial. V. The weight.—This character is most accurately discovered by taking the specific gravity of a mineral by means of a hydrostatic balance. See Hydrodyna¬ mics. But when this cannot be had recourse to, a mi¬ neral is examined by lifting it in the hand, and compar¬ ing its weight, thus estimated by the feeling, with its volume, by which means an approximation may be made to its specific gravity. Five degrees of this mode of estimating the weight of minerals have been assumed. 1. Supernatant, such minerals as swim in water, as naphtha, mountain cork. 2. Light, such minerals as have a specific gravity be¬ tween 1.000 and 2.epo, (taking wrater at 1.000) as am¬ ber, mineral pitch, and pitcoal. 3. Rather heavy, are-such minerals as have a specific gravity between 2.0OQ and which is the case with most kinds of stones, as amianthus, rock crystal, mica, fluor spar, diamond. 4. Heavy, when the specific gravity is from 4.000 to 6.000, as in most metallic ores, such as gray copper ore, red haematites, white lead ore, and in some others as heavy-spar. 5. Extremely heavy, when the specific gravity ex¬ ceeds 6.000, which includes the native metals, as native gold, native copper, and native silver, and some others, as galena, tinstone crystals, sulphurated bismuth, and vi¬ treous silver ore. VI. The smell is characteristic of only a small num- .. her of minerals. It is observed either, 1. Of itself without addition, and is, A. Bituminous, as mineral pitch and naphtha. B. Slightly sulphureous, as in native sulphur and gray antimonial ore. C. Bitterish, as in ochre kept dose shut up for some time. D. Clayey, as in yellow chalk. 2. After breathing on a mineral, which should be cold and breathed upon strongly and quickly, when the smell perceived is, A. Clayey hitter, as in hornblende and some sie- nites. 3. After rubbing or striking, when the smell emit¬ ted is, A. Urinous, as in swinestone after rubbing. B. Sulphureous, as in pyrites. C. Garlic, as in arsenical pyrites and white cobalt ore. D. Empyreumatic, as in quartz and pitcoal. VII. The taste, which is characteristic of one class of minerals, only, viz. the salts; and it is eithei, 1. Sweetish saline, as rock salt. 2. Sweetish astringent, as native alum. 3. Sourish astringent, as native vitriol. 4. Bitter saline, as native Epsom salt. 3. Cooling saline, as native nitre. 6. Lixivious, as native alkali. 7. Urinous, as native sal ammoniac. Beside the characters which we have now illustrated, some others are occasionally and successfully employed in the description of minerals. These have been brought under art I. MINER under the denomination of physical, chemical, and em¬ pirical characters. 1. Physical. The most common of the physical cha¬ racters is the property which some minerals possess of exhibiting signs of electricity and magnetism. Some minerals become electric by being heated, and others by friction ; and the electricity thus excited is* in some vitreous or positive, and in others resinous or negative. Some minerals, too, and particularly some varieties of iron ore, are distinguished by being attracted by the magnet. Such are magnetic pyrites, and magnetic iron sand. By filing a mineral so line that the particles shall swim on water, and then applying a magnet, the slightest degree of magnetic effect may be observed. Among the physical properties of minerals also, may be reckoned the phosphorescence, which is produced by- friction, as in some varieties of blende ; or by exposure to heat, as fluor spar, and some calcareous spars. To these characters also belongs the peculiar property of Lemnian earth and some other boles, which being thrown into water split into pieces with a crackling noise j and the property of some opals and other stones, of acquiring a higher degree of transparency when they are immersed in water, hence called hydrophanes. 2. Chemical characters.—By some simple experi¬ ments, the nature of many mineral substances may be easily and quickly ascertained, and particularly by means of acids. Thus, the nitrous acid is employed to discover whether a mineral effervesces, from which cha¬ racter the nature of the mineral can be more certainly known than by any other. Ammonia, or the volatile alkali, dissolves copper, and assumes a blue colour. A- tetic acid is successfully employed as a test of lead, which communicates to the acid a sweetish taste. By means of heat, and particularly by the use of the blow¬ pipe, much knowledge may be obtained of the nature of minerals. Some are volatilized; in others the colour is changed j and while some are nearly fused at dif¬ ferent temperatures, others burn with a flame of pecu¬ liar colours. 3. Empirical characters.—Among these characters, the most common is the peculiar efflorescence which takes place in some ores. In copper ores the efflores¬ cence is green or blue •, in iron ores, brown, yellow, or red j in cobalt, peach blossom red } and in arsensic, white. Characters for the distinction of minerals may be ob¬ tained from the circumstance of certain minerals being found generally accompanying others 5 as native arsenic with orpiment 5 gray copper ore with copper pyrites, A L O G Y. H5 and gray silver ore ; red copper ere with native copper : ciassifica white cobalt ore is rarely found without nickel • and tion by attending to this circumstance, it will not be mis-' V taken for arsenical pyrites. For the sake of brevity, Mr Kirwan, and others after him, have adopted a method of expressing some of the characters by means of numbers. The following table exhibits some of these characters and correspon¬ ding numbers. Resplendent, denoted by the number 4 Shining ^ Weakly shining 2 Glimmering; T Dull 0 Fragments, when the form is indeterminate. Very sharp-edged 4. Sharp-edged Bather sharp-edged Rather blunt Perfectly blunt Transparency. Transparent Semitransparent Translucent Translucent at the edges Opake Hardness. Of chalk, denoted by Yielding to the nail May be sci’aped with a knife Y ields more difficultly to the knife Scarcely yields to the knife Does not give fire with steel Gives feeble sparks with steel Gives lively sparks 4- 3- 2. x. o. But it is obvious that this abridged mode of expres¬ sing these characters, by means of numbers, can only be advantageously employed by those who have made them¬ selves quite familiar with the different numbers corres¬ ponding to the different shades of character, and who can thus recollect them with facility and px-ecision. To others tins method of description, by requiring constant lefeience to the explanation, may prove rather embar¬ rassing, so that what is gained in brevity may be lost in perspicuity. We propose, therefore, still to retain the verbal mode of expression in preference to the numerical. Table of Minerals arranged in the order of their Genera and Species, each Genus beino; divided into Families or Groupes, the characters of which latter are derived from their external properties according to the method of Werner. First Class. EARTHS & STONES- I. Diamond Genus. Diamond. II. Zircon Genus. Zircon. Hyacinth. Vol. XIV. Part I. III. Siliceous Genus. Chrysolite Family. Chrysoberyl. Chrysolite. Olivine. Coccolite. Augite. Vesuvian. t Garnet Family. Leucite. Melanite. Garnet. a. Precious. b. Common. c. Bohemian or Pyrope. Grenatite or Staurolite. T Ruby Family, Ceylanite. Spindle. Sapphire. Corundum. Adamantine spar, Emery. RchorL 146 Classifica- Schorl Family, tion. Topaz, v ■ ' Pyrophysalite. Fuel ase. Emerald. Beryl. Schorlite, Schorl. a. Common. b. Electric or Tourma¬ line. Pistazite. Zoisite. Axinite or Thumerstone. Quart* Family. Quartz. a. Amethyst. Common. Fibrous. b. Rock crystal. c. Rose-coloured or milk . quartz. d. Common quartz. e. Prase. f Ferruginous quartz, or iron flint. Hornstone. a. Splintery. b. Conchoidal. c. Ligniform. Flinty slate. a. Common. b. Lydian stone. Flint. Calcedony. a. Common. b. Carnelian. Opal. a. Precious. b. Common. d. Ligniform. Menilite. Jasper. a. Egyptian. b. Ribband. c. Porcelain. d. Common. e. Agate. f. Opal. Heliotrope or Bloodstone. Chrysoprase. Plasma. Cats eye. Pitchstone Family. Obsidian. Pitchstone. Pearlstone. Pumice. Zeolite Family. Prehnite. a. Fibrous. b. Foliated. Zeolite. L Ss} MINERALOGY. Fart I 1 Stilbite. c. Radiated d. Foliated Cubizite, Chabasie or A- nalcime. Cross-stone, Staurolite. Laumonite. Hipyre. Natrolite. Azurite. Lazulite. Hydrargillite. Feldspar Family. Andalusite. Feldspar. e. Adularia. b. Labradore stone. c. Common feldspar. d. Compact. e. Hollow spar, chiasto- lite. Scapolite. Arctizite or Wernerite. Diaspore. Spodumene. Meionite. Sommite. Ichthyophthalmite. IV. Argillaceous Gen. Clay Family. Native alumina. Porcelain earth. Common clay. a. Loam. b. Pipe clay. c. Potters clay. d. Variegated clay. c. Slaty clay. Claystone. Adhesive slate. Polishing slate. Tripoli. Floatstone. Alum stone. Clay Slate Family. Aluminous schistus. a. Common. b. Shining. Bituminous sehistus. Drawing slate. Whet slate. Clay slate. Mica Family. Lepidolite. Mica. Finite. Potstone. Chlorite. a. Earthy. b. Common. c. Foliated. d. Schistose. Trap Family. Hornblende. a. Common. v b. Basaltic. c. Labradore. d. Schistose. Basalt. Wacken. Phonolite or Clinkstone. Lava. Lithomarga Family. Green earth. Lithomarga. a. Friable. b. Indurated. Rock soap. Umber. Yellow earth. V. Magnesian Genus. Soap Stone Family. Native magnesia. Bole. Sea froth. Fullters earth. Steatites. Figure stone. Tale Family. Nephrite. a. Common. b. Axe-stone. Serpentine. a. Common. b. Precious. Schillerstone. Talc. a. Earthy. b. Common. c. Indurated. Asbestus. a. Mountain cork. b. Amianthus. c. Common asbestus. d. Ligniform asbestus. Actynolite Family. Cyanite. Actynolite. a. Asbestous. b. Common. c. Glassy. Tremolite. a. Asbestous. b. Common. c. Glassy. Smaragdite. Sahlite. Schalstone. VI. Calcareous Genus. Family of Carbonates. Agaric mineral. Chalk. Limestone. a. Compact. a'. Common. , b'. Oolite or roe-stone. b. Foliated. a!. Granular. b'. Calcareous spar. c. Fibrous. a'. Common. Classify b'. Calcareous sinter. tion. d. Pisolite or pea-stone, Calcareous tufa. Foam earth. Slaty spar. Arragonite. Brown spar. Dolomite. Rhomb or bitter spar. Swinestone. Marl. a. Earthy: b. Indurated. Bituminous marl slate. Family of Phosphates. Apatite. Asparagus stone. Phosphorite. Family of Fluatcs. Fluor. a. Earthy. b. Compact. c. Fluor spar. Family of Sulphates. Gypsum. a. Earthy. b. Compact. c. Foliated. d. Fibrous. Selenite. Anhydrite. Cube spar. VII. Barytic Genus. Family of Carbonates. Witherite. Family of Sulphates. Heavy spar. a. Earthy. b. Compact. c. Granular. d. Foliated. e. Common. f. Columnar. g. Fibrous. h. Bolognian. VIII. Strontian Genus. Family of Carbonates. Strontites. Family of Sulphates. Celestine. a. Fibrous. b. Foliated. Second Class. SALTS. I. Genus Sulphates, Native vitriol. Native alum. Mountain butter. Capillary salt. Native Epsom salt. Native Glauber salt. II, irt I. Lata. ,JT: Gem* Nitrates. j tion. Native nitre. j-r-1^ III. Genus Muriates. Rock salt. a. Foliated. b. Fibrous. Sea salt. Native sal ammoniac. IV. Genus Carbonates. Native soda. Native magnesia. V. Genus Borates. Boracite. VI. Genus Fluates. Cryolite. Third Class. COMBUSTIBLES. I. Genus Sulphur. Native sulphur. a. Common. b. Volcanic. II. Bituminous Genus. Petroleum, or mineral oil. Mineral pitch. a. Elastic. b. Earthy. c. Slaggy. Amber. a. White. b. Yellow. Brown coal. a. Common. b. Bituminous wood. c. Earth coal. d. Alum earth. e. Moor coal. Black coal. a. Pitch coal. b. Columnar coal. c. Slaty coal. d. Cannel coal. e. Foliated coal. Coarse coal. Coal blende. a. Conchoidal. b. Slaty. III. Graphite Genus. Graphite. a. Scaly. b. Compact. Mineral charcoal. Fourth Class. METALLIC ORES. I. Platina Genus. Native platina. II. Gold Genus. Native gold. a. Golden yellow. b. Brass yellow. c. Grayish yellow. III. Mercury Genus. Native mercury. Native amalgam. Corneous ore of mercury. mineralogy Liver ore of mercury. a. Compact. b. Slaty. Cinnabar. a. Common. b. Fibrous. IV. Silver Genus. Native silver. a. Common. b. Auriferous. Antimonial silver ore. Arsenical silver ore. Corneous silver ore. Sooty silver ore. Vitreous silver ore. Brittle vitreous silver ore. Red silver ore. a. Dark red. b. Bright red. White silver ore. Black silver ore. V. Copper Genus. Native copper. Vitreous coppe^pre. a. Compact. b. Foliated. Variegated copper ore. Copper pyrites. White copper ore. Gray copper ore. Black copper ore. Red copper ore. c. Compact. b. Foliated. c. Capillary. Brick red copper ore. a. Earthy. b. Indurated. Emerald copper ore. Azure copper ore. a. Earthy. b. Indurated. Malachite. c. Fibrous. b. Compact. Green copper ore. Ferruginous green copper ore. a. Earthy. b. Slaggy. Micaceous copper ore. a. Foliated. b. Lenticular. Muriate of copper. VI. Iron Genus. Native iron. Iron pyrites. a. Common. b. Radiated. c. Capillary. d. Hepatic. Magnetic pyrites. Magnetic iron ore. a. Common. b. Arenaceous. Specular iron ore. a. Common. d. Compact. b'. Foliated. b. Micaceous iron ore. Red iron ore. a. Red iron froth. b. Compact. e. Red haematites. d. Red ochre. Brown iron ore. a. Brown iron froth. b. Compact. c. Brown haematites. d. Brown ochre. Sparry iron ore. Black iron ore. a. Compact. b. Black haematites. Argillaceous iron stone. a. Red chalk. b. Columnar argillace ous iron stone. c. Granular. d. Common. e. Reniform. f. Pisiform. Bog iron stone. a. Morassy. b. Swampy. c. Meadow. Blue earthy iron stone. Green earthy iron stone. VII. Lead Genus. Galena. a. Common. b. Compact. Blue lead ore. Brown lead ore. Black lead ore. White l\ead ore. Green lead ore. Red lead ore. Yellow lead ore. Native sulphate of lead. Earthy lead ore. a. Friable. b. Indurated. VIII. Tin Genus. Tin pyrites. Common tinstone. Grained tin ore. IX. Bismuth Genus. Native bismuth. Vitreous bismuth. Ochre of bismuth. X. Zinc Genus. Blende. a. Yellow. b. Brown. c. Black. Calamine. a. Compact. b. Foliated. XI. Antimony. Native antimony. Gray ore of antimony. T a a. Compact. b. Foliated. c. Radiated. d. Plumose. Red ore of antimony. White ore of antimony. Ochre of antimony. XII. Cobalt Genus. White cobalt ore. Gray cobalt ore. Shining cobalt ore. Black cobalt ochre. a. Friable. b. Indurated. Brown cobalt ochre. Yellow cobalt ochre. Red cobalt ochre. a. Earthy. b. Radiated. XIII. Nickel Genus. Copper-coloured nickel. Nickel ochre. XIV. Manganese Genus. Gray ore of manganese, a. Radiated. b. Foliated, r. Compact. d. Earthy. Black ore of manganese. Red ore of manganese. XV. MolybdenaGenus, Sulphuret of molybdena. XVI. Arsenic Genus. Native arsenic. Arsenical pyrites. a. Common. b. Argentiferous. Orpiment. a. Yellow. b. Red. Native oxide of arsenic. XVII. Tungsten Genus. Wolfram. Tungstate of lime. XVIII.Titanium Genus, Menachanite, Octahedrite. Titanite. Nigrine. Brown ore. Iserine. XIX. Uranium Genus. Pitchy ore. Micaceous uranite. Uranite ochre. XX. Tellurium Genus* Native tellurium. Graphic ore. Yellow ore. Black or foliated ore. XXI. Chromium Genus. Needle ore. Ochre of chromium. XXII. Columbium Gen. XXIII. Tantalium Gen. XXIV. Cerium Genus. I. Genus, 14-8 MINEKALOG Y. Parti Diamond , ^e“us- . L Genus. DIAMOND. One Species. Diamond. Id. Kirwin, I. 393. Ze Diamant, Brochant, II. 153. Haiiy, III. 287. Essential character.—Scratches all other minerals. External characters.—Its most common colours are grayish white and yellowish white j smoke gray and yellowish gray j clove brown; sometimes asparagus green, passing to pistachio green and apple green j sometimes a wine yellow and citron yellow, and also blue and rose red. When the diamond is cut, it presents a splendid and varied play of colours, which is one of its most striking characters. It is found sometimes in rounded grains, which are supposed to have been crystals with the edges worn 5 but it is most frequently met with crystallized. The primitive form is a regular octahedron, the in¬ tegrant molecule a regular tetrahedron j but the form which it commonly assumes is the spheroidal, with 48 curvilineal faces, six of which correspond to the same face of the primitive octahedron. Besides this form there are various others, as the double three-sided py¬ ramid, the dodecahedron, &c. All the modifications of the crystals of the diamond, Hauy observes, seem to be the effects of its tendency to crystallize in a regular figure of 48 plane faces, which, if it ever has existed, has not yet been discovered; and it is easy to conceive that this form would be produced by intermediate decre¬ ments on all the angles of the nucleus j but the devia¬ tions from this form seem to have been occasioned by its precipitate formation. The external lustre is from four to one 5 internal four. The fracture is straight foliated, with a fourfold cleavage, parallel to the faces of the octahedron 5 trans¬ parency four to three 5 hardness ten; brittle; specific gravity 3.518 to 3.600. Becomes positively electric by friction, even before it is polished. Chemical character.—When exposed to a sufficient temperature, it is entirely consumed. This has been fully ascertained by the experiments of modern che¬ mists, from which it is concluded, that the diamond is entirely composed of pure carbone. See Chemistry. Mr Boyle was the first, according to Henckel, who subjected the diamond to the action of heat, and in his experiments he found that it exhaled very copious and acrid vapours. This was about the year 1673 ; but in the year 1694 the experiment was repeated .by the order of Cosmo III. grand duke ofTuscany. Diamonds were exposed to the heat of the powerful burning glass of Tschirnhausen, the action of which was even aided by means of another burning glass ; and about the end of 30 seconds a diamond of 20 grains lost its trans¬ parency, separated into small pieces, and was at last entirely dissipated. The same experiment was repeated on other diamonds, always with the same result, and without exhibiting the least sign of fusion. Newton, in his treatise on Optics, has placed the diamond among combustibles, supposing that it is a coagulated unctu¬ ous substance. He had been led to this by observing its extraordinary refractive power, which in combusti¬ ble bodies he found to be in a ratio considerably higher I than their density. According to this general law he classifies concluded, that the diamond as well as water contained tion. an inflammable principle, both oi which have since w been verified. Newton’s treatise was not published till 1704 ; but it appears that part of it was composed and read to the Royal Society in the year 1675* nearly 20 years before the Florentine experiments were made. But nearly 70 years before this latter period, Boetius de Boodt, in his History of Stones, appears to have been perfectly satisfied, from an experiment which he describes, that the diamond was of an inflammable na¬ ture. This document, which we presume will gratify the curiosity of many of our readers, is too singular to be omitted. “ Mastix deinde calefieri par urn, quemad- modum et adamas debet, idque, ut impositus ac supra positus mastici statim illi unione vera uniatui;, ac vivos undique radios a se jaceat. Hanc umonem respuunt aliae omnes gemmae diaphanae—cur vero legitimus ada¬ mas solus tincturam illam recipiat, aliae gemmae non, difficile est scire. Existimo mutuum ilium et amicum amplexum propter similitudinem aliquam quam habent in materia et qualitatibus; hoc est, tota utriusque na- tura fieri, quod itaque mastix quceignece natures est ada- manti facile jungi possit, signum est; id propter ma- teriae similitudinem fieri, ac adamantis materiam ig- ?iea?n, et sulphuream esse, atque ipsius humidum intrin- sicum ec primogenium cujus beneficio coagulatus est, plane fuisse oleosum et igneum, aliarum vero gemmarum aqueum.—Non mirum itaque si pinguis, oleosa, et ignea masticis substantia illi absque visus termino adpingi et applicari, aliis vero gemmis non possit.” Boetius de Boodt, Gem. et Lapid. Hist. Hanoviae, 1609. 4to. lib. ii. cap. I- For the sake of the English reader we shall translate this curious document. “ It mastich and the diamond be exposed to heat, and brought into contact, they enter into perfect union, and emit a very lively flame, which does not take place in any other gem. But what is the reason that the diamond alone possesses this pro¬ perty P I am of opinion that this mutual combination arises from a certain resemblance which each of the substances possesses in its nature and properties : on this account, therefore, the mastich, which is of a combusti¬ ble nature, may be united to the diamond from a simi¬ larity in their nature, w'hich shows that the diamond is composed of combustible and sulphureous matter; and that the humid and original particles of its composition, by means of which it was coagulated, or assumed a so¬ lid form, have been decidedly of an oily and inflamma¬ ble nature, while those of other gems have been of an aqueous nature. It is not, therefore, surprising that the fat, oily, and combustible substance of mastich may enter into intimate union with the diamond, but cannot be combined with other gems.” Localities, &c.—The diamond is found in various places of the East Indies, as in the provinces of Gol- conda and Visapour, in the peninsula of Hither India; and in the kingdoms of Pegu and Siam, in the penin¬ sula of Farther India, and nearly, it is observed, in the same degree of latitude. In 1728 the diamond was discovered in Brasil, in the district of Serro-do-Frio, which is situated in the same southern latitude as the countries which produce the diamond on the north side of the equator. The native repository of the diamond, so far as is known, is a ferruginous soil, but whether it trt I. M I N E R Lssifica- be produced on the spot where it is discovered, or have .’lion. been transported from the place of its origin, has not ' been ascertained. It is found also in veins filled with soil of a similar nature. We shall here add a short his- ^ tory of the diamond mines. mond The diamond mines are found only in the kingdoms its. of Golconda, Visapour, Bengal, the islandof Borneo, and Brasil. There are four or five mines, or rather three mines and two rivers, whence diamonds are obtained. The mines are, I. That of Raolconda, in the province of Carnatica, five days journey from Golconda, and eight from Visapour. It has been discovered about 200 years. 2. That of Gani, or Coulour, seven days journey from Golconda eastward. It was discovered 150 years ago by a peasant, who digging in the ground found a na¬ tural fragment of 25 carats. 3. That of Soumelpour, a large town in the kingdom of Bengal, near the Dia¬ mond-mine. This is the most ancient of all: it should rather be called that of Goual, which is the name of the river, in the sand whereof these stones are found. 4. The fourth mine, or rather the second river, is that of Succudan, in the island of Borneo j and, 5. That of Serro-do-Frio in Brasil. Diamond-mine of Raolconda.—In the neighbour¬ hood of this mine the earth is sandy, and full of rocks and copse-wood. In these rocks are found several lit¬ tle veins of half and sometimes a whole inch broad, out of which the miners, with a kind of hooked irons, draw the sand or earth wherein the diamonds are j breaking the rocks when the vein terminates, that the track may be found again, and continued. When a sufficient quantity of earth or sand is drawn forth, they wash it two or three times, to separate the stones. The miners work quite naked, except a thin linen cloth before them ; and besides this precaution, have likewise inspectors, to prevent their concealing diamonds, which, however, they frequently find means to do, by watching opportunities when they are not observed, and swallow¬ ing them. Diamond-mine of Gani or Coulour.—In this mine are found a great number of diamonds from 10 to 40 ca¬ rats, and even more. It was here that the famous dia¬ mond of the Great Mogul, which before it was cut weighed 793 carats, was found. The diamonds of this mine are not very clear: their water is usually tinged with the quality of the soil *, being black where that is marshy, red where it partakes of red, sometimes green and yellow, if the ground happen to be of those colours. Another defect of some consequence is a kind of greasi¬ ness appearing on the diamond, when cut, which takes off part of its lustre.—There are usually no less than 60,000 persons employed in this mine. When the miners have found a place where they in¬ tend to dig, they level another somewhat bigger in the neighbourhood thereof, and inclose it with walls about two feet high, only leaving apertures from space to space, to give passage to the water. After a few su¬ perstitious ceremonies, and a kind of feast which the master of the mine makes for the workmen, to encou¬ rage them, every one goes to his business, the men digging the earth in the place first discovered, and the women and children carrying it off into the other walled round. They dig a few feet deep, and till such time as they find water. Then they cease dig¬ ging; and the water thus found serves to wash the A L O G Y. 149 earth two or three times, after which it is let out at Diamond an aperture reserved for that end. This earth being genus, well washed, and well dried, they sift it in a kind of ^ open sieve, and lastly, search it well with the hands to find the diamonds. This mine is in a plain of about one league and a half in extent, bounded on one side by a river, and on the other by a range of lofty moun¬ tains, which form a semicircle. It is said that the nearer the digging is carried to the mountains, the diamonds are the larger. Diamond-mine of Soumelpour, or river Gouah— Soumelpour is a considerable town near the river Goual, which runs into the Ganges. It is from this river that all our fine diamond points, or sparks, called natural sparks, are brought. They never begin to seek for diamonds in this river till after the great rains are over, that is, after the month of December ; and they usually even wait till the water is grown clear, which is not be¬ fore January. The season at hand, eight or ten thou¬ sand persons, of all ages and sexes, come out of SoumeL- pour and the neighbouring villages. The most expe¬ rienced among them search and examine the sand of the river, and particularly where it is mixed with py¬ rites, going from Soumelpour to the very mountain whence it springs. When all the sand of the river, which at that time is very low, has been well examin¬ ed, they proceed to take up that wherein they judge diamonds likely to be found ; which is done after the following manner: They dam the place round with stones, earth, and fascines, and throwing out the water, / dig about two feet deep: the sand thus got is carried into a place walled round on the bank of the river. The rest is performed after the same manner as at other mines. Diamond-mint in the island of Borneo, or river of Succudan.— We are but little acquainted with this mine ; strangers being prohibited from having access to it: though very fine diamonds have been brought to Ba¬ tavia by stealth. They were formerly imagined to be softer than those of the other mines ; but experience shows they are in no respect inferior. Diamond-mine of Serro-do-Frio.'—A description of this mine was given by D’Andrada in J792> t^ie ■^a~ tural History Society of Paris. The mine is situated to the north of Villa Rica, in the 18th degree of south latitude. The whole country in which the diamonds are found abounds with ores of iron ; and the stratum of soil, immediately under the vegetable soil, contains diamonds disseminated in it, and attached to a gaugue or matrix which is more or less ferruginous ; but they are never found in veins. When this mine was first discovered, the searching for diamonds was so successful, that the Portuguese fleet which arrived from Rio de Janeiro in 1730 brought no less than 1146 ounces of diamonds. This unusual quan¬ tity introduced into the market immediately reduced the price ; and to prevent this circumstance recurring, the Portuguese government determined to limit the number of men employed in the mines. ^ As the diamond is the hardest of all substances, it Method of can only be cut and polished by itself. To bring it cutting and to that perfection which augments its price so consi-Phishing derably, the lapidaries begin by rubbing several against (1*amond3‘ each other, while rough; after having first glued them to the ends of two wooden blocks, thick enough to be held ,lSi 150 Diamond held ill the hand. It is this powder thus rubbed off genus the stones, and received in a little box for the purpose, i'" y“"~' ‘ that serves to grind and polish them. Diamonds are cut and polished by means of a mill, which turns a wheel of soft iron sprinkled over with diamond-dust mixed with oil of olives. The same dust, well ground, and diluted with water and vine¬ gar, is used in the sawing of diamonds j which is performed with an iron or brass wire, as fine as a hair. Sometimes, in lieu of sawing the diamonds, they cleave them, especially if there be any large shivers in them. The method of cutting and polishing the diamond was not discovered till the 15th century. The dia¬ monds which were employed as ornaments before that period, were in their rough and natural state. The invention is ascribed to Louis Berguen, a native of Bruges, who in the year 1476, cut the line diamond of Charles the Bald, duke of Burgundy, which he lost the same year at the battle of Morat. This diamond was then sold for a crown, but afterwards came into the possession of the duke of Florence. The first water in diamonds means the greatest pu¬ rity and perfection of their complexion, which ought to be that of the purest water. When diamonds fall short of this perfection, they are said to be of the second or third water, &c. till the stone may be properly called a 17 coloured one. Of estimat- The value of diamonds is estimated by Mr Jefferies ins- by the following rule. He first supposes the value of a rough diamond to be settled at 2l. per carat, at a medium j then to find the value of diamonds of greater weights, multiply the square of their weight by 2, and the product is the value required. E. g. to- find the value of a rough diamond of two carats : 2 X 2=4, the square of the weight 5 which, multiplied by two, gives 81. the true value of a rough diamond of two carats. For finding the value of manufactured diamonds, he supposes half their weight to be lost in manufacturing them ; and therefore, to find their value, we must multiply the square of double their weight by 2, which will give their true value in pounds. Thus, to find the value of a wrought diamond weighing two carats ) we first find the square of double the weight, viz. 4x4—16', then 16x2—32. So that the true value of a wrought diamond of two carats is 32I. On these principles Mr Jefferies has constructed tables of the price of diamonds from 1 to 100 carats. Celebrated The greatest diamond ever known in the world is diamonds, one belonging to the king of Portugal, which was found in Brasil. It is still uncut : and Mr Magellan informs us, that it was of a larger size } but a piece was cleaved or broken off’ by the ignorant countryman, who chanced to find this great gem, and tried its hard¬ ness by the stroke of a large hammer upon the anvil. Tb is prodigious diamond weighs 1680 carats : and although it is uncut, Mr Rome de I’Isle says, that it is valued at 224 millions sterling; which gives the esti¬ mation of 79,36 or about 80 pounds sterling for each carat: viz. for the multiplicand of the square of its whole w-eight. But even in case of any error of the press in this valuation, if we employ the general rule above mentioned, this great gem must be worth at least 5,644,800 pounds sterling, which are the product of 1680 by two pounds, viz. much above five millions Part and a half sterling. But this gem is supposed by some classify to be a white topaz. tion j The famous diamond which adorns the sceptre of'~~v^*i the empress of Russia under the eagle at the top of it weighs 779 carats, and is worth at least 4,854,728 pounds sterling, although it hardly cost 135,417 gui¬ neas. This diamond was one of the eyes of a Mala- barian idol, named Scharingham. A French grenadier, who had deserted from the Indian service, contrived so w'ell as to become one of the priests of that idol, from which he had the opportunity to steal its eye : he run away to the English at Trichinopoly, and thence to Madras. A ship-captain bought it for twenty thousand rupees : afterwards a Jew gave seventeen or eighteen thousand pounds sterling for it : at last a Greek merchant named Gregory Suffras, offered it to sale at Amsterdam in the year 1766 : and Prince Or- loff made this acquisition for his sovereign the empress of Russia. This diamond is of a flattened oval form and of the size of a pigeon’s egg. The diamond of the Great Mogul is cut in rose ; weighs 279/0 carats, and it is worth 380,000 guineas. This diamond has a small flaw underneath near the bottom : and Tavernier, page 389, who examined it, valued the carat at 150 French livres. Before this diamond was cut, it weighed 7934 carats, according to Rome de I’Isle : but Tavernier, page 339, of his se¬ cond volume, says that it weighed 900 carats before it was cut. If this be the very same diamond, its loss by being cut was very extraordinary. Another diamond of the king of Portugal, -which weighs 215 carats, is extremely fine, and is worth at least 369,800 guineas. The diamond of the grand duke of Tuscany, now of the emperor of Germany, weighs 1394- carats ; and is worth at least 109,520 guineas. Tavernier says, that this diamond has a little hue of a citron colour j and he valued it at 135 livres iournoises the carat. Robert de Berquen says, that this diamond was cut into two : that the grand Turk had another of the same size : and that there were at Bisnagar two large diamonds, one of 250 and another of 140 carats. The diamond of the late king of France, called the Eitt or Regent, weighs 1364 carats : this gem is worth at least 208,333 guineas, although it did not cost above the half of this sum. Patrin says, that it is believed to be at Berlin, (I. 226.) and we may add, that it has pro¬ bably been carried back to France among other spoils. The other diamond of the same monarch, call¬ ed the Sancy, weighs 55 carats ; it cost 25,000 gui¬ neas : and Mr Duten says, that it is worth much above that price. Brilliant Diamond, is that cut in faces both at top and bottom ; and whose table, or principal face at top, is flat. To make a complete square brilliant, if the rough diamond be not found of a square figure, it must be made so; and if the work is perfectly executed, the length of the axis will be equal to the side of the square base of the pyramid.—Jewellers then form the table and collet by dividing the block, or length of the axis, into 18 parts. They take Ts-g- from the upper part, and t1^ from the lower. This gives a plane at T\ distance from the girdle for the table; and a smaller plane at -rg- distance from the collet; the breadth of which will be MINERALOGY. irt I. ssifica- MINERALOGY. be J- of the breadth of the table. In this state the stone is said to be a complete square table diamond.—The brilliant is an improvement on the table-diamond, and was introduced within the 17th century according to Mr Jefferies. has been found in Norway, in a rock composed of feld¬ spar and hornblende. Uses.—The zircon is employed as a precious stone, and particularly as an ornament in mourning. 2. Species. Hyacinth. II. Genus. ZIRCON. 1. Species. Zircon. Jargon^ Kirw. I. 257. Zircon, Haiiy. II. 465. Id, Brochant, I. 159. Essen. Char.—Its specific gravity about 4.4 ; the joints natural, some of which are parallel, and others are oblique to the axis of the crystals. E.vter. Char —Colours reddish and yellowish, green¬ ish, greenish yellow, and whitish. The colour in gene¬ ral varies from green to gray, and is most commonly pale; and the polished stone exhibits in some degree the play of colours of the diamond. > It is found in rounded, angular, or flattened grains, or in small angular fragments with notched edges, and also crystallized. The primitive form is an octahedron with isosceles triangles, and the integrant molecule is an irregular tetrahedron. The following are the most common forms of its crystals. 1. A prism with four rectangular faces, each base of which has a pyramid with four faces placed on the four lateral faces, which terminates sometimes in a line, but most frequently in a point. 2. The preceding crystal, in which the opposite late¬ ral edges of the prism are truncated. 3. The crystal (1.) in which the edges of the faces of the pyramid are bevelled. 4. The crystal (1.) having the lateral edges of the prism, and the summit of the pyramid trun¬ cated. 5. The crystal (1.) in which the angles between the prism and the pyramid are bevelled. 6. A prism with four faces, having the two opposite narrow, and the two others broad. 7. A double pyramid with four faces, with the edges of the common base truncated. 8. The perfect octahedron with obtuse angles. The crystals are commonly small 5 the surface smooth, but that of the angular fragments is rough. Lustre, 3 and 4 j internal lustre 4 and 3 ; somewhat vitreous, or approaching to that of the diamond. Fracture imper¬ fect or flat conchoidal; fragments, 3. Transparency, 4, 3. Causes double refraction. Hardness, 9 j brittle. Spec. grav. 4 416 to 4.4700. Chem. Char.—Infusible by the blow-pipe without ad¬ dition, but with borax it forms a transparent colourless glass. The following are its constituent parts. Zirconia, Silica, Iron, Loss, Localities.—The zircon was first found in Ceylon, ac¬ companied with crystals of spinelle and tourmaline, in a river near the middle of the island ; and more lately it 70 26 1 3 100 Id. Kirw. I. 257. Zircon, Hairy, II. 465. DHyacinthc, Brochant, I. 163. Essen. Char.—Uhs same as the first species. Exter Char.—The most common colour is what is called hyacinth red, blood red, and yellowish brown. It is found in rounded grains, and frequently in cry¬ stals, the primitive form of which is the same as the first species. The crystals are, 1. A prism with four faces. 2. The same slightly truncated on its edges. 3. The double pyramid with four faces, or a very ob¬ tuse octahedron, which is a rare variety. 4. A prism with six faces, each base of which is ter¬ minated by an acumination with three faces, placed al¬ ternately on the three lateral edges, forming the rhom- boidal dodecahedron. The crystals are commonly small, the surface smooth j external lustre, 3, 4; internal, 44 greasy, fracture straight foliated j cleavage double, rectangular ; frag¬ ments, 3 5 transparency, 4, 2; causes double refraction; hard and brittle; unctuous to the touch when cut; spec grav. 4.385 to 4.620. Chem. Char.—By the action of the blow-pipe the hyacinth loses its colour, but retains its transparency. It is infusible without borax, which converts it into a transparent colourless glass. Constituent Parts. From Ceylon. Zirconia, 70 Silica, 25 Oxide of iron, 0.5 Loss,. 4.5 From Expailly. 64.5 66 32 31 2 2 1‘S 1 100 Klap. iooVauq. JOoVauq,. Localities.—It is found in Ceylon in similar situations with the former; in Brazil, Bohemia, and in the rivulet Expailly, in Velay in France ; and also in the neigh¬ bourhood of Pisa in Italy. Uses.—As it is susceptible of a fine polish, the hya¬ cinth has been ranked among precious stones. Remarks.— I he analogy between the crystalline forms of the zircon and hyacinth; their double refrac¬ tion ; the similarity of their other characters, and parti¬ cularly the results of chemical analysis, have led Haiiy to form them into one species. A variety, under the name of cinnamon stone, has been considered as a distinct species ; but the differences are so very slight, that it may be included in.the descrip¬ tion of the preceding. III. Genus. SILICEOUS. 1. Species. Chrysoberyl. Id. Emm. Wid. Lenz. Kirw. Chrysopale, Lara. Cy~ mophane, Hairy. Exter. Char.—’The colour is an asparagus green; passing Zircon genus. I V. Siliceous passing sometimes to a greenish white, and sometimes to genus. an olive green } sometimes bright brown and yellowish “v brown, passing to yellowish gray } affords a feeble change of colour from bluish to milky white. It is found in angular or rounded grains, which ap¬ pear to have been water worn •, and in crystals, exhi¬ biting, l. A table with six faces, elongated, of various thickness, truncated on the terminal edges. 2. A prism with four rectangular faces. 3. A prism with six faces, of which four are broader and two are narrower oppo¬ site to each other. The grains are slightly rough, and have a consider¬ able external lustre. The crystals are striated length¬ wise on their lateral faces 5 the other faces are smooth *, lustre external very shining—internal the same, inter¬ mediate between that of the diamond and the vitreous lustre. The fracture is in all directions perfectly conchoidal; the fragments are indeterminate with sharp edges. It has little transparency, but a considerable degree of hardness. Spec. grav. 3.698 to 3.719 Wern. 3.710 Klap. 3.796 Hauy. Chan. Char.—It is infusible without addition by the action of the blow-pipe. By Klapi'oth’s analysis, the following are its constituent parts. MINERALOGY. Part In another variety the summit of the pyramid is ctasnfie Alumina, Silica, Lime, Oxide of iron, Loss, 71-5 18 6 *•5 3 truncated by a convex cylindrical plane, the convexity of which passes from one of the small opposite lateral ~ planes towards the other. 4. In some instances the crystals are so small, that the same lateral faces almost entirely disappear, while the two larger assume a curved form, giving such crys¬ tals a tabular appearance. The external surface of the angular fragments and of the rounded crystals is scaly, which affords an essen¬ tial character to this mineral. The small lateral planes are smooth, the broad ones are distinctly striated length¬ wise. Externally the surface is shining j internally shining and vitreous. The fracture in all directions is perfectly conchoidal •, the form of the fragments is indeterminate, with very sharp edges. It is almost always transparent, and re¬ fracts double} it is not so hard as quartz. Brittle. Spec. grav. 3.340 to 3.420 Wern. 3.428 Hauy. Chem. Char.—By the action of the blow-pipe it is fused with borax without effervescence, and affords a greenish, transparent glass. tiou. Constituent parts. Crystallised. Silica, 38 Magnesia, 39*5 Oxide of iron, 19. Loss, 3.5 Cut. 39 43-5 J9 Crystallised. '38 5°-5 9*5 2. IOO Klap. 100.5 Vtmff. 100 Vauq. IOO ■Localities.—Brazil, Ceylon, Siberia. Uses.—The hardness of the chrysoberyl, and change of colour which it exhibits, have procured it a place among precious stones of inferior value. It is known in commerce under the name of changeable opal or oriental chrysolite. 2. Species. Chrysolite. Id. Emm. Wid. Lenz, Mus. L'esk. Kirw. Peridot, Daub. Hauy. Exter. Char.—The most common colour is a bright pistachio green, passing to an olive green ; sometimes of a bright asparagus or clear meadow green ; rarely the green approaches to brown and almost to a cherry red. It is found in angular fragments with the edges a little notched, or in rounded grains, or in crystals hav¬ ing the angles and edges a little notched. The forms of its crystals are, 1. A large rectangular prism having its lateral edges truncated and sometimes bevelled, and terminated by a six-sided prism, of which two opposite sides are placed on the small lateral faces of the prism. The four others on the lateral truncated faces, the latter forming a more acute angle than the two for¬ Localities, &c.—This mineral is brought from the Levant, but it is not known whether it is found in Asia or Africa. It has been discovered in Bohemia j and crystallised specimens included in a kind of lava have been brought from the isle of Bourbon. As it is usually found in rounded fragments, in the midst of earthy substances, its relative situation is scarcely known. Uses.—The chrysolite has been often employed for various purposes as a precious stone, but as it possesses no great degree of hardness, it is not much esteemed. Substances of a very different nature have been, at different times, described under the name of Chrysolite. It appears that the yellow chrysolite of the ancients is the same with our topaz, and that their green topaz is our chrysolite. Plin. lib. xxxvii. cap. 8. 3. Species. Olivine. Id. Emm. "Wid. Lenz. Kirw. Lameth. Chrysolite en grains irreguliers, De Born. Peridot Granuh- formc, Hauy. Chrysolith des Volcans, of many mi¬ neralogists. Exter. Char.—The most common colour is a bright olive green, sometimes of an apple green, pistachio, or mountain green j a wine, honey, or orange yellow, and sometimes also a reddish brown, and brownish mer. 2. The next form varies from the preceding, in hav¬ ing tw’o additional terminating faces, placed on the broad faces of the prism, each of which is consequently situated between two of the planes corresponding to the- truncated planes. black ; but these latter varieties are rare. It is found in rounded pieces, from the size of the head to that of a grain of millet, most commonly included, and disseminated in basalt. It has been found crystal¬ lized. Internally, art I. MINERALOGY. ilassifica- Internally, this mineral varies in its lustre between tion. shining and weakly shining; in the yellow varieties the lustre is between vitreous and resinous. The fracture is more or less conchoidal ; sometimes uneven 5 the shape of the fragments is indeterminate, with sharp edges. The rounded pieces of a certain size are composed of distinct granular concretions, with small grains. It is sometimes transparent, and varies to semitrans¬ parent and translucent. It. is brittle, and not so hard as quartz. Spec. gray. 3.225 to 3.265. Chem. Char.—Olivine is infusible by the action of the blow-pipe ; in nitric acid it loses its colour, giving to the liquid a pale yellow colour. Constituent Parts. Klaproth. Silica, 48 to 52.O 52 Magnesia, 37 38.5 37.75 Lime, 00.25 00.25 0.25 Oxide of iron, 1^.5 12. IC).75 Loss, 2-25 — 100.00—102.75 100.75 Localities, &c.—Olivine is found in different coun¬ tries, as in Bohemia and Saxony, and in Vivarais in France, and most commonly in rounded pieces in the cavities of basalt. Brochant says that it has not been discovered in the basalts of Ireland, England, Sweden, Norway, and Italy. We have, however, collected specimens of olivine among the basaltic rocks of the Giant’s Causeway in Ireland. Olivine and chrysolite are considered by Hauy as one species, and described under the name peridot. 4. Species. Coccolite. Coccolithe, Brochant, ii. 504. Hally, iv. 355. D’An- drada. Nich. 4to. Jour. v. 495. Exter. Char.—Colour, meadow green, olive, or blackish green. It is found in masses which are com¬ posed of separate pieces, granular, in small grains, which may be easily separated j these grains are angu¬ lar, and discover some appearance of tendency to cry¬ stallization. Lustre, resplendent, vitreous; fracture foliated 5 cleavage double, as examined by Haiiy, but single ac¬ cording to D’Andrada : it is hard, scratches glass j the grains are often -translucent. Spec. grav. 3.316 to 3*373- Chem Char.—Coccolite is infusible without addition before the blow-pipe. With borax it melts into a pale yellow transparent glass, and with carbonate of potash into an olive green vesicular glass. Constituent Parts. Silica, 50.0 Lime, 24.O Magnesia, 10.0 Oxide of iron, 7.0 Oxide of manganese, 3.0 \Alumina, 1.5 Loss, 4.5 100 Vou XIV. Part L Localities.—It is found in the iron mines of Hel- lesta and Assebo in Sudermania, at Nerica in Sweden, and near Arendal in Norway. 5. Species. Augite. Octahedral Basaltine, Kirw. i. 219. VAugite, Bro¬ chant, i. 179. Pyroxene, Haiiy, iii. 80. Essen. Char.—Divisible, parallel to the sides of an oblique rhomboidal prism, of about 920 and 88°, whicli is subdivided in the direction of the great diagonals of the bases. Exter. Char.—Colour, olive green, black, white, and gray. It is found sometimes in rounded pieces, and in grains, but most frequently crystallized. The primi¬ tive form is an oblique-angled prism, the bases of which are rhombs : the integrant molecule is an oblique tri¬ angular prism. The form of the crystals is generally a six and eight-sided prism, which is terminated by a two-sided summit. The crystals are commonly small, smooth, and brilliant, sometimes a little shining. In¬ ternal lustre shining, and almost resplendent, resinous. Fracture perfectly foliated ; cleavage double j trans¬ lucent at the edges j harder than olivine ; gives lively sparks with steel, and scratches glass 5 rather brittle ; spec. grav. 3.226 to 3.777. Chem. Char.—Fusible before the Wow-pipe with dif¬ ficulty, and only in small fragments, .which melt into a black enamel. Constituent Parts. From _ & Colour white, grayish or bluish white, yellowish or blackish: various colours appear in spots, clouds, stripes, and veins. Sometimes when it is cut it is iridescent j commonly translucent, rarely semitransparent. Harder -han flint. Brittle. Spec. grav. 2.600 to 2.700. C/iem. Crtar.—Before the blow-pipe it is infusible. Constituent Farts. Bergman. Silica, 84 Alumina, 16 A trace of iron, — loo A L O G Y. 1(5 Localities, &c.—Calcedony is most usually met with Siliceous in globular masses in amygdaloid, as at Oberstein, in genus the duchy of .Deux Pouts. It is found also in Saxony, v—— Silesia, and Siberia, in Iceland and the Faro islands •, in the north of Ireland ; and in several of the western islands of Scotland. The cavities of the balls of calce-< dony are often lined with crystals of quartz and ame¬ thyst. Uses.—Calcedony takes a fine polish, and is therefore employed in jewellery. 2. Subspecies. Carnehan. Id. Kirw. i. 300. La Cornaline, Brochant, i. 272; Quarto-Agathe Cornaline, Hauy, ii. 425. This mineral is found in masses, or disseminated, hut most frequently in rounded pieces of a globular, kidney form, or stalactitical shape. External surface rough and uneven j internal lustre glimmering, or slightly shining j fracture perfectly conchoidal ; fragments very sharp- edged 5 most common colour blood red of various shades, and sometimes reddish brown or wax and honey yel¬ low ; semitransparent, hard, and brittle. Spec. grav. 2.59 to 2.73. Chem. Char.—Carnelian is infusible before the blow- pijie, but loses its colour, and becomes white. Localities, &c.—Carnelian is found in similar cir¬ cumstances, and in similar places with common calce¬ dony, but is of less frequent occurrence. The finest carnelians are brought from the east, and thence they are denominated oriental. Uses.—The carnelian is employed for the same pur¬ poses as common ealcedony. Observations on Agate.—As common calcedony and earnelian, along with jasper, constitute the base of the greater number of agates, it may be here proper to in¬ troduce a few remarks on the mineral substances which are included under this name, and on the theories of their formation. The term agate is of very general application, com- Varieties-. prebending numerous varieties, which are chiefly distin- of agate, guished by the arrangement and disposition of the co¬ lours with which they are marked, and from which they have derived particular names. The following are seme of the principal varieties of agate. 1. Fortification- agate, in which the different coloured stripes are ar¬ ranged in a zigzag manner, presenting something of the appearance of a fortified town. 2. Landscape agate, in which the colours and shades are so arranged as to exhibit the appearance of a landscape. 3. Band or ribbon agate, in which the various colours are disposed in stripes or zones, which are usually in straight lines, but sometimes concentric. To this variety of agate, when the zones or stripes are arranged parallel to each other, and distinctly marked, the name of onyx was gi¬ ven by the ancients. The name onyx, which signifies the nail of the finger, is derived from the whitish co¬ lour resembling that part of the body. They also gave the name of sarde to a variety of the same stone, of a flesh colour, and afterwards the compound name sardo^ nyx was given to another variety, in which a whitish layer of the onyx, having some degree of transparency, covered another layer of a flesh red, the colour of winch latter appeared through the former in the same manner 33 the colour of the flesh appears through the nail. But *68 MINERALOGY. Part in the end, the name of onyx seems to have been ap¬ plied to all stones formed of layers of different colours. 1 4. Moss agate. In some varieties of agate filaments of a greenish or other colour, having the appearance of some species of confervae or musci, are observed, and these have been denominated moss agates, borne have supposed that these filaments have been real mosses or confervse, enveloped by the siliceous matter. In some also delineations of a brown or black colour, exhibit the appearance of trees or shrubs. This dendritical ap¬ pearance is ascribed by some to the infiltration of iron or manganese into the natural fissures of the stone. 1 he finest-agates of this variety, it is said, are brought from Arabia, by the way of Mocha, on the coast of the Red and hence they are known by the name of Mocha 26 by fusion, sea, dun v..^ — j stones. Besides these varieties, there are several others, as tubular agate, Avhen it is composed of calcedony, which seems to have been in the form of stalactites, and afterwards filled up with a different mineral substance, or at least of a different colour j clouded agate, pre¬ senting the appearance of clouds ; radiated or stellated, when the different colours are arranged in rays; breccia agate, composed of fragments of different kinds of agate, and cemented together by siliceous matter, and consti¬ tuting a real breccia j spotted agate, when the colours are disposed in points or spots •, petrified agate, which seems to have been wood penetrated with the matter of agate j -coral agate, having the appearance of eoralloid; jasper agate, in which the predominant part of its com¬ position is jasper. . 'Formation The formation of agate has been the subject of muck of a^ate, controversy among contending theorists j for while one party conceives that it affords the strongest proofs of being produced by means of heat, or from a state °‘^u' sion, another party seems to be equally convinced that it supplies them with the most certain evidence of hav- ing been formed from an aqueous solution. ^Besides other strong objections that might be urged a- gainst the opinion of agate being formed from a state of fusion, the uniformity and regularity in the arrangement of the different kinds of matter of which it is composed, seem quite hostile to it, and, excepting to those who are previously prepossessed with such an opinion, will, we presume,' appear altogether insurmountable *, for it is inconceivable, that a mass of melted matter, whether it have been in a state of fusion in the place where it is now found, or projected from the bowels of the earth into the strata which are now its repository, while m a soft state, could arwnge itself into layers, some of them often extremely thin, and disposed in stripes, concentric circles, spots, while these various kinds of matter exhi¬ bit very slight shades of difference in their constituent parts. ; It cannot even be imagined that all this could have been effected, even by the slowest and most gra¬ dual process of cooling. . , 1 . • In accounting for the formation of agate by solution nfiltratiop. in water, it is said that the cavities in the rocks which contain agate, were formed 111 consequence ol the evo¬ lution and extrication of air, while those rocks were in a state of softness j and that the matter of which agate is composed, was introduced In the state of an aqueous solution by means of infiltration. But objections, equal¬ ly insurmountable, might easily be adduced against this theory : and one of the first that presents itself is de¬ sired from the diversity of matter deposited in masses of Z 27 ^by aqueous agate. This objection, indeed, is attempted to be ob- ckssiiio viated by supposing that the agate composed of different lion, kinds of matter was derived from different kinds of sue-u—“v- cessive solutions : but this is only removing the diffi¬ culty a step farther j for, can it easily be conceived, that a very thin layer of one kind of matter being deposited, and this, let it be supposed, of a white colour, the solu¬ tion was changed, from which proceeded another thin layer; that the solution was again changed, and depo¬ sited a third kind of matter ; and after another change, a fourth kind, or perhaps that the deposition of the first kind of matter again commenced. But if infiltration from an aqueous solution have really been the mode of formation of this mineral, how comes it, it may be fairly asked, that the depositions from the different kinds of solution have not been arranged, at least in the larger cavities, in strata or zones parallel to the horizon ; be¬ cause it seems natural to suppose that the deposition of stony matter, from a state of solution in water, would be influenced by gravitation, and thus be horizontally arranged ? We are arvare, indeed, of an objection which may be made to this observation. It will be said that the influence of gravity has in this case been counteracted by the action of affinity between the stony matter in solution, and the sides of the cavity in which the agate is formed ; but whatever effect this might have in the smaller cavities, its influence would be di¬ minished in those of larger capacity. To what we have now said on this subject, which, it must be acknowledged, is more curious than useful, we shall only add a circumstance which, so far as we know, has not been noticed by geologists ; but it seems to be of considerable importance to the establishment or sub¬ version of the theory of the formation of agate by means of infiltration in the state of aqueous solution, it will be allowed, we presume, that all agates found in the same horizontal position, or at the same depth from the surface, from which the aqueous solution is under¬ stood to have proceeded, were formed from the same so¬ lutions ; at least those agates which are contiguous to each other, that is, within the space of a few yards, or even of a single yard. Now, if this be admitted, all the agates which have derived their materials from the same solutions, ought to be exactly of the same kind, because their origin is cotemporaneous, and it is derived from the same solutions. To ascertain this point with precision, it will be necessary to examine agates in their native repositories; and although we shall not pretend confidently to decide the question, because our observa¬ tions with this view have not been sufficiently varied and extensive, yet wre strongly suspect, that it will ap¬ pear, from future investigations, that agates, and even such as are almost contiguous to each other, have been formed of very different materials, or of similar mate¬ rials arranged in a very different manner. To those who are fond of such speculations we recommend this as a subject of investigation. Localities.—Agates are found in great abundance in different parts of the w'orld. They are sometimes di¬ stributed indiscriminately with the rocks which contain them, sometimes in beds or layers, in interrupted masses, and sometimes in thin beds, where there is scarcely any interruption of continuity. This last mode of arrange¬ ment, however is rare. Agates are sometimes found in metallic veins, or are mixed with metallic substances, .as rt I. MINER ,ssiflca- as the sulphurets of leail and silver. It would appear, Lion. too, that agates also exist in primitive rocks. Saus- "v —JJsiire has observed them in granite, containing no¬ dules of the same granite, and penetrated with iron py¬ rites. He has observed also at the same place, near Vienne, in the department of Iserc, thin layers of cai- cedony alternating .with gneis ; but porphyries and similar rocks are the usual repositories of agate. These stones are found in great variety and abundance at Oberstein, in the department of 'Mont-Tonerre, in France, in a rock of amygdaloid of a peculiar nature, and lull ol cavities o.f all sizes. Tins rock is considered by Dolomieu as a volcanic tufa •, but according to other mineralogists, and particularly Faujas de St Fond, who 'lum 1)!1S gIvcn a m*nute description of it*, it is considered as a porphyry or amygdaloid, with a basis of trap, pi. which is very subject to decomposition. The globular masses of agate are disposed in this rock without any or¬ der, and are usually enveloped with a peculiar greenish earth, but which contains no copper. In the geodes of agate found at Oberstein, jasper, amethyst, carbonate of lime in crystals, chabasie, a species of zeolite, and some portion of titanium, have been observed ; but not the least trace of any organized body. Digging, polishing, and forming into a great variety of ornamental objects, constitute the chief employment of tire inhabitants of Oberstein. Agates are found in abundance in different parts of Scotland : but the largest and finest are met with in the neighbourhood of Montrose and Stonehaven; in the rocks near Dunbar on the east coast, and in the rocks about Dunure, on the shore of Carrick in Ayrshire. 32. Species. Hyalite. Itl. Kirw. i. 296. Muller'1 s glass of the Germans. La¬ va glass of many, Exter, Char.—1 his substance is found in grains or masses, or in thin layers on other minerals. It has much the appearance of gum, and is usually cracked. The lustre is shining and vitreous; fracture conchoidal, sometimes foliated ; fragments sharp-edged. Colour gi-ayish white or yellowish; and, according to Kirwan, pure white. Translucent, sometimes semi- transpai’ent; has considerable hardness, and is brittle. Spec. grav. 2.no. Chem. C/iar.-—Infusible at 150° Wedgwood, but melts with soda. Constituent Parts. Silica, 57 Alumina, 18 Lime, I ij With some traces of iron. Localities, &c.—Hyalite is found in rocks of amyg¬ daloid, or wacken, near Franckfort on the Maine. 33. Species. Opal, This species is divided into four subspecies or varie¬ ties. Subspecies 1. Precious Opal. Opal, Kirw. i. 289. L'Opale Noble, Brochant, i. 341. Quartz-resinite Opalin, Hauy, ii. 434. Vol. XIV. Part I. i A L O G Y. 1 Exter. Char.—This mineral is found massive or disse- rsiliceous rnmated, and sometimes in veins ; internal lustre splen- genus, dent and vitreous; fracture perfectly conehoidal; lVa«--~~y— njents sharp-edged. Colour milk-white, clear or pale, and sometimes .bluish gray; and by holding it in different lights, a very brigi:!; and varied play of colours, the principal of wbieh ate golden yellow, scarlet red, bright blue, green and gray, is seen. It is commonly translucent, rarely semitrans¬ parent; pretty hard and brittle. Spec. grav. 2.114 Chan. Char.—The precious opal treated with the* blow-pipe splits and cracks, and loses its transparency, but is not melted. Constituent Parts. Klaproth. Silica, 90 Water, 10 100 Localities.—The finest .opals are found at Czerwenitza net far from Caschau in Upper Hungary, in an argilla¬ ceous decomposed porphyry, which according to some mineralogists is a gray stone (graustein of the Germans), and are disposed in veins, nests, and grains. When the opal adheres in small particles ctosely together in the stone, it forms what is called mother of opal. It is found in the same manner in a kind of breccia of this decomposed porphyry. (Townson’s Travels in Hun- gary, p. 307.). It is found also at Eibenstock, Johann- Georgenstadt, and Freyberg in Saxony. At this latter place the repository of the opal is porphyry. The opal also is met with in Iceland. The opal mines described by Dr Townson are situat¬ ed in a hill of some miles in extent not far from the village of Czerwenitza. This hill has been opened in several places, but in three with the greatest success. Guards are placed upon it to prevent any person from digging this precious stone ; for as it is situated in part of the royal domain, the peasants who were formerly permitted to search for it on their own account are now prohibited by tlie emperor. But even at the time Dr Townson visited the mines the work had been disconti¬ nued for three or four years as unprofitable. The usual mode of conducting the operations in searching-for the opal is by quarrying to the depth of three or four yards, rarely deeper. The rock is thus thrown out, broken to pieces, and afterwards examined. In one place the search had been made by mining; but the gallery was only a few yards in length. From this account it ap¬ pears that the rock containing the opal lies near the surface, and seldom, it is said, extends deeper than a few fathoms. The opals denominated oriental by the lapidaries, a term expressive of their value rather than of their origin, are supposed to be from these mines, in which, according to records still in existence, 300 men were employed not less than 400 years ago. Uses.—On account of the fine play of colours, the opal is held in great estimation for the purposes of jewellery, and the opals which reflect green colours in most abundance are most highly valued. The finest opals are called oriental; but this epithet is given by the lapidaries to the more perfect precious stones, and is not to be understood as denoting that they have been brought from eastern countries. Y The MINER The ancients, it would appear from the account of Pliny, attached an immense value to this stone } tor he informs us that a senator called Nonius rather submit¬ ted to banishment than give up an opal which he had in his possession to Mark Anthony. I his opal was es¬ timated at 20,000 sesterces. Lib. xxxvii. cap. 6. Subspecies 2. Common Opal. Semi-opal, Kirwan, i. 290. L'Opale Commune, Bro- chant. i. 344. Quartz resinite Hydrophone et Quartz rcsinite Girasol, Hauy, ii. 433. Exter. Char.—Common opal is found in masses, or disseminated, sometimes in rounded or angular pieces, and sometimes kidney-shaped or botryoidal. Internal lustre splendent, and intermediate between vitreous and resinous. Fracture conchoidal, but sometimes uneven. Fragments sharp-edged. Colour milk-white, and varieties of this colour held in certain directions appear ol a wine yellow. The other shades of colour are yellowish or reddish white, and wax or honey yellow. Semitransparent and sometimes trans¬ parent. Specific gravity from 1.958 to 2.015. In other characters the same as the precious opal. Chem. Char.—Infusible before the blow-pipe, but melts with borax, and without swelling up. Constituent Parts. Klaproth. From Kozemutz. Silica, 98.75 Alumina, 0.10 Oxide of iron, 0.10 Loss, 1.05 100.00 From Telkobanya. Silica, 93.50 Oxide of iron, 1.00 Water 5.00 Loss 100.00 Localities, &c.—The common opal is found in veins,, chiefly in amygdaloid rocks, and sometimes also, it is said, in granites and porphyries. It is of most frequent occurrence in Bohemia ; in Saxony, as at Freyberg, Eibenstock, &c. j in Hungary, in Poland, in Scotland, and the Faroe islands. The amygdaloid rocks in the vicinity of the Giants Causeway in the north of Ireland also afford a repository for this mineral. Uses.—It is employed as well as the former for the purposes of jewellery, but is esteemed of inferior value. It has been observed of some varieties of common opal that they are hydrophanous, that is, they possess the property of becoming transparent when immersed in water, a. property which it is supposed depends on the absorption of the water in the pores of the opal. When similar varieties of opal are dipped in melted wax, they are impregnated with it, and become in like manner transparent, but on cooling resume their opaci¬ ty. To such varieties He Born has given the name of Pyrophane. Subspecies 3. Semi-opal. Id. Kirwan, i. 290. La Demi-opale, Brochant, i. 347. Quartz Resinite Commune, et Menilite, Hauy, »i- 433- Exter. Char.—This mineral is found in masses or disseminated, in angular fragments, stalactitical, botry- A L O G Y. Parti oidal, or in superficial layers. Lustre glimmering or Classifica., shining, and intermediate between vitreous and resi- tion. nous. Fracture conchoidal, and frequently even. Frag- 'r^' ments sharp-edged. Colours extremely various, but in general duller and less vivid than common opal. The most predominant are yellowish, grayish and reddish white, more rarely milk white. Various colours are sometimes disposed in spots, stripes, and clouds. Translucent at the edges, and sometimes, but rarely, semitransparent. Pretty hard and brittle. Spec. grav. 2.540. Chan. Char.—Infusible before the blow-pipe, but melts with borax and without frothing up. Constituent Parts. Klaproth. Silica, 43.50 Oxide of iron, 47.00 Water, 7*5° Loss, 2.00 100.00 Localities, &c.—-The semi-opal is found in the same places and in similar rocks with the common opal, as in basalt and amygdaloid, but chiefly in granite and porphyry, and particularly in the veins of such rocks containing silver. Some varieties of pitch stone have been ranked with semi-opal by mineralogists ; and menilite, a mineral to be afterwards described, has been also considered mere¬ ly as a variety of it. ' Subspecies 4. Wood Opal. Ligniform Opal, Kirwan, i. 295. Opale Ligniforme, Brochant, i. 350. Quartz resinite Xijloide, Hauy, ii. 439* Exter. C/mr.—This variety of opal is found in masses of dift’erent sizes, retaining the form and texture of the wrood which is supposed to be penetrated with the stony opaline matter. Lustre interally weakly shining, be¬ tween vitreous and resinous. Transverse fracture con¬ choidal, longitudinal fracture shows the woody texture. - Fragments sharp-edged. Colours grayish and yellowish white, yellowish brown and ochre yellow. Different colours are sometimes ar¬ ranged in concentric circles, in spots, and stripes. Of¬ ten opake, but rarely translucent except at the edges. Intermediate between hard and semi-hard. Brittle. Spec. grav. 2.600. Localities, &tc.—The wood opal is found at Pornick near Sehemnitz in Hungary, and at Telkobanya in the. same country. 34. Species. Menilite. Pifchstone, Kirwan, i. 292. Variety of Jlint of some, and Semi-opal of Klaproth. Exter. Char.—This mineral is found in tuberose mas¬ ses, which have a smooth ribbed surface, and are some¬ times covered with a whitish, crust. Internal lustre weak¬ ly shining. Transverse fracture flat, conchoidal; lon¬ gitudinal, coarse, splintery. Fragments sharp-edged. Chesnut brown colour, and marked with alternating stripes of pearl gray and reddish brown. Translucent. Pretty hard and brittle. Spec. grav. 2.185. Constituent art I. jassifica- tion. MINERALOGY. Constituent Parts. Klaproth. Silica, 85.50 Alumina, 1. Oxide of iron, .50 Lime, .50 Water and carbonaceous matter, 11.50 Loss, 1. Localities, &c.—This variety of jasper abounds in Si¬ beria : it is found also in Saxony, in the Hartz, where it reposes on gray wacken j in Sicily j and in the hills in the vicinity of Edinburgh. Subspecies 3. Porcelain Jasper. Porcellanne, Kirw. i. 313. Le Jaspe Porcelaine, Broch, ' 336- I'hermantide Porcellanite, Hauy, iv. 510. 171 Siliceous , genus. 100.00 Localities, &c.—This mineral is found at Menil- Montant, from which it derives its name, near Paris, in nodules disposed in interrupted strata, in the middle of a foliated, argillaceous schistus, which is interposed between the beds of gypsum. 35. Species. Jasper. Jasper has been divided into six subspecies, 1. Egyp¬ tian ; 2. Striped j 3. Porcelain j 4. Common j 5. Agate j and, 6. Opal. Subspecies 1. Egyptian Jasper. Egyptian Pebble, Kirwan, i. 312. Le Jaspe Egyptien, Brochant, i. 332. Exter. Char.—This variety of jasper is found in rounded pieces, which are generally spherical, and have a rough surface. External lustre glimmering or weakly shining; internal weakly shining. Fracture per¬ fect conchoidal j fragments sharp-edged. The colours of this variety are disposed in zones or irregular stripes, which are nearly concentric. These colours are yellowish brown on a ground of chesnut brown •, usually opaque, or slightly translucent at the edges. Spec. grav. 2.56 to 2.6. Chem. Char.—Infusible before the blow-pipe. Localities, &c.—-This mineral, as its name imports, is brought from Egypt, where, as was observed by Cor- dier, it constitutes part of a breccia which is entirely composed of fragments of siliceous stones, immense stra¬ ta of which abound in that country, and the deserts of Africa in the vicinity. The masses of jasper are found among the sand which has been derived from the decomposition of this breccia, and particularly near Suez. Uses.—This variety, on account of its hardness and beautiful colours, is in considerable estimation for orna¬ mental purposes. Subspecies 2. Striped Jasper. U Kii ’W. i. 312. Le Jaspe Rubane, Broch. i. 334. Quai'tx-Jaspe Onyx, Hauy, ii. 436. Exter. Char.—This variety of jasper is found massive, and sometimes forms entire beds. It has no lustre, ex¬ cept from the mixture of extraneous substances. Frac¬ ture conchoidal, sometimes splintery or earthy. Frag¬ ments sharp-edged. To the variety of colours of this mineral it owes its name. These are pearl gray, yellowish and greenish gray, with shades of red and blue, and these different colours are arranged in straight or curved lines ; gene¬ rally opaque, translucent only at the edges. . Exter. Char.—Usually found in masses or angular pieces, in which rents or fissures are often observed, and also in whole beds. Internal lustre glimmering or weakly shining $ resinous. Fracture imperfect conchoi¬ dal or uneven. Fragments sharp-edged. The colour exhibits great variety j pearl, ash, yel¬ lowish and bluish gray, with shades of yellow, red, and rarely green. The colour is generally uniformly the same, but sometimes it is striped and dotted, flamed and clouded; impressions of vegetables of a red colour are observed on the blue varieties, and the rents or fissures are of a red colour in the grayish specimens ; is entire¬ ly opaque $ pretty hard, and easily frangible. Chem. F/ir/r.—-Melts before the blow-pipe into a black slag. Constituent Parts. Rose. Silica, 60.7 5; Alumina, 27-27 Magnesia, 3. Fotash, 3.66 Oxide of iron, 2.50 T 97’o8 .Loss, 2.82 100.00 Localities, &c.—This mineral is abundant in different parts of Bohemia ; it is met with also in Saxony, in the rocks in the vicinity of Edinburgh, and on the coast of Fife near Dysart in Scotland. This jasper derives its name from its fracture, which resembles that of porcelain $ and as it is frequently found in places where subterraneous fires have existed, such as beds of coal which have been kindled by ac¬ cident, it is ascribed to their action j and according to Werner, it is nothing more than a slaty clay altered by fire, Subspecies 4. Common Jasper. Id. Kirw. i. 310. Jaspe Commun, Broch. i. 338. Exter. Char.—This variety is usually found massive, sometimes disseminated, or alternating in thin layers with other stones. Lustre glimmering or shining, be¬ tween vitreous and resinous. Fracture more or less per¬ fectly conchoidal, sometimes splintery or earthy. Frag¬ ments sharp-edged. Colours extremely various, exhibiting different shades of red, yellow, and black $ and several of these are united together, presenting clouds, spots, and stripes. Usually opaque, or slightly translucent at the edges. Is scratched by quartz. Easily frangible. Spec. grav. 2.3 to 2.7. Chem. Char.— Entirely infusible before the blow- Y 2 pipe. 172 Siliceous genus. MINERALOGY. Part pipe. Its constituent parts are extremely variable. The following were obtained by the analysis of Kirwan. Silica, 7 5 Alumina, 20 Oxide of iron, 5 100 Localities, &c.—This jasper is very common in diffe¬ rent parts of the world ; in Saxony, Bohemia, Hungary, France, Spain, Italy, Siberia, and also in Scotland, as among the basaltic rocks in the vicinity of Edinburgh, and at Dunbar. It is usually found in veins, especially such as contain ores of iron. It is often traversed with veins of quartz, or mixed with pyrites, lithomarga, semi¬ opal, brown spar, native and vitreous silver. It has been taken for the basis of some porphyries, but these turn out to be indurated clay, pitch stone, and horn stone. Subspecies 5. Jasper Agate. Exter. Char.—Heliotrope is found massive or in an- C]assii. gular pieces j external lustre glimmering er shining, tion. and resinous } fracture conchoidal, sometimes uneven. Fragments very sharp-edged. Colour chiefly deep green, but of various shades, with spots of olive and yellow, but most frequently scarlet or blood red : translucent at the edges : hard, easily fran¬ gible. Spec. grav. 2.62 to 2.7. Chcm. Char.—Entirely infusible before the blow-pipe. Localities, &c.—This mineral was originally brought from the east, but it has since been found in Siberia, in Bohemia, where it is met with in a vein, and in Ice¬ land. Uses.—It is employed for similar purposes with jasper or agate. By many mineralogists this mineral is considered as a variety of jasper ; hence it has been called oriental jasper j and it is supposed by some to be a calcedony penetrated with green earth. Exter. Char.—This variety seems to be the same as that already mentioned under the name of agate jasper, in speaking of agates at the end of the description of calcedony. It is found massive, and possesses no lustre. Fracture conchoidal, generally opaque, pretty hard, and sometimes adheres to the tongue. The colours are yellowish or reddish white, which are disposed in stripes and circles. Localities, &c.—It is met with in many places in agate balls, in amygdaloid rocks. Subspecies 6. Opal Jasper. Exter. Char.—This variety of jasper seems to possess many common characters with some varieties of opal. It is found massive. Internal lustre between vitreous and resinous, is shining or resplendent. Fracture con¬ choidal. Fragments very sharp-edged. Colours scarlet red, blood red, brownish red, more rarely yellow. Colours disposed in veins, spots, and clouds. Opaque, or translucent at the edges. Brittle, and easily frangible. Localities, &c.—This mineral is found in Hungary, in Siberia, and other places, and is usually in nests in porphyry. Beside the localities of the different varieties of jasper already mentioned, we may notice that it is met with in Siberia of a white and bluish colour. The hill on which the fortress of Orskaia stands on the left bank of the river Jaik, in the government of Orembourg, is en¬ tirely composed of a pale green and deep red jasper, disposed in inclined beds ; and on the most elevated parts of the Altaian mountains, near the source of the river Korgou, a jasper has been discovered of an ivory white colour, which is remarkable for being penetrated with black dendrites. Uses of Jasper.—It is valued according to its hard¬ ness, the degree of polish of which it is susceptible, and the beauty and variety of its colours ; and it is employ¬ ed in foi-ming vases, handles for swords and knives, and other smaller ornamental purposes. 36. Species. Heliotrope, or Bloodstone. lleliotropium, Kirw. i. 3I4* L'Heliotrope, Broch. i. 276. 0'iiart‘Z jaspc Sanguin, Hauy, ii 436. 37. Species. Chrysoprase. Chrysoprasmm, Kirw. i. 284. La Chrysoprase, Broch. i. 280. Quart'z Agathc Prase, Hauy, ii. 426. Exter. Char.—This mineral is found massive, or in angular fragments : internal lustre rarely glimmering ~r fracture even, sometimes splintery ; fragments sharp- edged. Colour apple-green, greenish gray, or leek-green ; translucent, sometimes semitransparent; less hard than calcedony and flint. Spec. grav. 2.25. Chem. Char.—Infusible before the blow pipe, but loses its transparency, and becomes white. Constituent Parts. Klaproth. Silica, 96.16 Alumina, .08 Lime, .82 Oxide of iron, .08 Oxide of nickel, 1.00 Loss, 1.86 loc.ca Localities, &c.—Chrysoprase is found at Kosemufz, in Upper Silesia, in a mountain composed of serpentine, asbestus, indurated talc, and lithomarga. Uses.—It is employed for similar purposes as jasper, and it is greatly esteemed when it is of a fine apple- green colour. It is said that some varieties of this mi¬ neral lose their colour by being exposed to moisture, so that the jewellers, before using them, put them to tire test, by keeping them for some time in a moist place. 38. Species. Plasma. Id. Broch. i. 278. Silcx Plasmc, Brongniart, ii. 398. Exter Char.—This mineral is found disseminated, in rounded pieces, and also in angular pieces. Internal lustre glimmering or weakly shining; resinous. Fracture conchoidal, even, and sometimes splintery. Translu¬ cent, and sometimes even transparent in thin pieces. Colour various shades of green ; and sometimes dif¬ ferent colours are disposed in spots, stripes, and points. Nearly art I. MINER assifica- Nearly equally hard with ealcedony. Brittle, and easily tion. frangible. '-y—* Chem. Char.—It is infusible before the blow-pipe, but becomes white. Localities, Sec.—It is said by some, that this mineral has only been found among the ruins of Rome, but ac¬ cording to Brougniart and others, it has been found in the Levant, in Upper Hungary, and in Moravia, in a mountain of serpentine, where it is accompanied with hint. Uses—It appears that this mineral was much em¬ ployed by the ancients for ornamental purposes. 39. Species. Cat’s Eye. Id. Kirw. i. 30t. VOcil dc Chat, Brochant, i. 292. Quarto-Agathe Chatoyant, Hauy, ii. 427. Exter. Char.—This mineral, as it is brought from its native country, is usually cut and polished,, so that its natural form is unknown j but it is supposed that itrs met with in grains or rounded pieces. A mass describ¬ ed by Klapx-oth, which seemed to be in its natural state, had a quadrangular form, a rough surface, and consider¬ able brilliancy. The lustre is resplendent and resinous. The cross fracture is uneven, the longitudinal fracture imperfectly foliated. Fragments more or less sharp- edged. The colour is greenish yellow and smoke gray, of various shades, and sometimes, but rarely, grayish or silvery white. It is translucent, rarely semitransparent. When it is cut, it reflects different rays of light by changing its position, a character by which it is easily known. This is ascribed to small parallel fibres which appear in the interior of the stone. It is hard, easily frangible. Spec. grav. 2.625 to 2.660. Chem. Char.—It melts with great difficulty by the action of the blow-pipe. Klaproth subjected it to the heat of a porcelain furnace, but it was not melted 5 it only lost its hardness, lustre, and transparency, and the colour became of a pale gray. Constituent Parts. Klaproth. Silica, 95.00 94.50 Alumina, 1.75 2.00 Lime, 1.50 1.50 Oxide of iron, 0.25 0.25 Loss, 1.5a 1.75 100.00 100.00 Localities.—Cat’s eye is brought from Ceylon and the Malabar coast, and also, it is said, from Egypt and Arabia $ but always in the polished state. The only one known in its natural state was that above mention¬ ed, which was presented to Klaproth by Mr Greville of London. Uses. —This mineral is in great estimation as a pre¬ cious stone, and it is usually cut for ring-stones. The name is derived from its possessing th» property of reflecting the light similar to the eye of the cat, and hence the term chatoyant among jewellers, which is ex¬ pressive of that effect. 49. Species. Obsidian. Id. K irwan, i. 265. Iceland agate vulgo. Z’ Obsidienne, A L O G Y. Brochant, i. 288. Lave vitreuse Obsidienne, Hauy, iv. 594- Exter. Char.—This mineral is found in masses, and sometimes in rounded pieces. Lustre resplendent, vi¬ treous j fracture perfectly conchoidal j fragments very sharp-edged. The most common colour of obsidian is perfectly black, sometimes greenish and grayish, black, blueish, greenish and smoke gray, and yellow and red, accord¬ ing to Humboldt: most commonly opaque, but some¬ times translucent on the edges. It is hard and easily frangible. Spec. grav. 2.348. Chon. Char.—Before the blow-pipe obsidian melts into an opaque porous glass, of a grayish white co¬ lour. '73 Siliceous genus. Silica, Alumina, Oxide of iron, Constituent Parts. Bergman. Abilgaard. 69 22 9 74 12 I4 Silica, Alumina, Lime, Oxide of iron and manganese, Potash and soda, Loss, 100 Descotils. 72.O 12.5 100 } 2.0 10.0 3-J Drappier. 74- 14. 1.2 3- 3 4- 5 71.0 i3-4 1.6 4.0 4.0 6.0 100.0 100.0 100.0- Localities, &c.—This mineral is found in Iceland, in Siberia, in the Lipari islands, in Hungary, in Ma¬ dagascar, the island of Teneriffe, in Mexico, Peru, a>nd some of the South sea islands. Humboldt discovered a variety of obsidian in New Spain, which was chatoyant in a considerable degree. The obsidian from Hungary is found in insulated pieces among detached masses of granite, gneiss, and decomposed porphyry. Obsidian was long supposed to have a volcanic origin ; but it ap¬ pears, from the accounts of those who have visited Ice¬ land, that it is not only found in the vicinity of Hecla, but everywhere, distributed like quartz and flint j and besides it is not unfrequent in countries where volcanoes were never known to exist. Uses.—The fine colour and hardness of this stone have brought it into use for ornamental purposes. Among the ancient Mexicans and Peruvians it was em¬ ployed as mirrors, some of which, it is said are some¬ times still found in the tombs of their ancient sovereigns {Faujas Miner, des Volcans, p. 308.) j and also for cut¬ ting instruments as knives and even razors. Hernan¬ dez saw the Mexican cutlers make a hundred knives of obsidian in the course of an hour. Obsidian, it is said, has also been used as mirrors for telescopes. 41. Species. PlTCKSTONE. Id. Kirwan, i. 292. La pierre depoix. Brochant, i. 353. Petrosilcx rcsiniformc, Hauy, iv. 386. Exter. Char.—Pitchstone, which has received its name MINER name from its resemblance to pitch, is found massive sometimes in extensive beds and veins, and also forming entire mountains. Internal lustre shining and resin¬ ous. Fragments sharp-edged. In coarse and frequent¬ ly small granular distinct concretions which have a smooth surface. The colours are various shades of black, green, brown, red, and gray. Translucent, but commonly at the edges only. Brittle, and rather easily frangible. Spec. grav. of pitchstone from Saxony, 2.314 j of black pitchstone from Arran, 2.338 j of pitchstone from Meis¬ sen 1.645, Klaproth. Chem. Char.—Fusible by the blow-pipe, and is con¬ verted into a white porous ■enamel. Constituent Parts of pitchstone from Meissen of an olive green colour. Klaproth, Transl. ii. -207- Silica, 73 Alumina, I4*5° Xime, 1 Oxide of iron, I Oxide of manganese, 0.10 Soda, ‘I*75 Water, 8.50 Loss, 1.5 100.00 Silica, Alumina, Oxide of iron, Lime, Potash, Water, Loss, 75*25 12. i.6o •50 4*5° 4-50 1*65 100.00 tion. A L O G Y. Part Localities, &c.—Pearlstone is found near Tokay in Classif;t; Hungary, in strata alternating with those of argilla¬ ceous porphyry, and containing in its vesicles nodulesv of obsidian ; it is also met with in Iceland, and in the north of Ireland. 43. Species. Pumice. Id. Kirwan, i. 415. La Pierre ponce, Brochant, i. 443. Ponce, Brongniart, i. 332. Lave vitreuse pumicec, Hauy, iv. 495. Exter. Char.—This mineral is found massive or dis¬ seminated, and it is always of a porous or vesicular 'texture. Lustre glimmering, or a little shining and silky. Fracture fibrous $ fragments blunt-edged. Colour grayish white, bluish, or yellowish gray. Opaque, rarely translucent at the edges, sometimes se- mihard, but generally soft, very brittle, and very easily frangible. Spec. grav. 0.914. Chem. Char.—Fusible before the blow-pipe, and is converted into a white glass. Constituent Parts. Klaproth, ii. 208. Localities, &c.—-Pitchstone is found in great abun¬ dance in Saxony, in Hungary, and also in Siberia. It abounds also in Scotland, particularly in the island of Arran, where it is met with in beds, but chiefly in veins traversing the strata in the less elevated parts of the island. Pitchstone also forms the basis of a porphyry. 42. Species. Pearlstone. •Obsidienne Perlee, Brongniart, ii. 340. Lave Vitreuse Perlee, Hauy, iv. 495. Volcanic Zeolite, Fichtel. Zeolitic Pitchstone of others. See Klaproth, Transl. ii. 263. Exter. Char.—Pearlstone almost always forms the .ground or basis of a species of porphyry which contains roundish or longish vesicular cavities. Lustre pearly. Fracture seems imperfectly conchoidal j but is not very perceptible. Fragments blunt-edged. Colour bluish, ash, greenish gray. Translucent at the edges. When breathed upon, gives out the argilla¬ ceous odour. Not brittle, but easily frangible. Soft. •Spec. grav. 2.340 to 2.548. Chem. Char.—Before the blow-pipe froths up like zeolite, but is not fused. Constituent Parts. Klaproth, ii. 267. Silica, Alumina, Oxide of iron, Soda of potash. Loss, 77*50 n-s° *‘15 3* .25 100.00 Localities, Stc.—Pumicestone has been supposed ia be a volcanic production, because it is found in the vi¬ cinity of volcanoes; the Lipari islands are almost en¬ tirely composed of it, and there it is accompanied with obsidian. It is also found in Iceland and Tenerifie; in Hungary $ and on the banks of the Rhine between Andernach and Coblentz.. Uses.—Pumice is very much employed in polishing stones, metals, glass, ivory, and in the preparation of parchment. A rare variety of pumice is described by Brongniart in the form of vitreous filaments as fine as hair ; the colour is a deep bottle green, and it melts by heat into a white enamel. This pumice is supposed to be pro¬ jected from the volcano in the isle of Bourbon. 44. Species. Prehnite. Id. Kirwan, i. 274. La Prehnite, Brochant, i. 295. Prehnite, Hauy, iii. 67. Essen. Char.—Divisible by one distinct line only, and pretty clean j electric by heat. Exter. Char.—Prehnite is found either massive or crystallized. The principal form of its crystals is a four-sided rhomboidal table, which is either perfect or truncated on all its edges, or a table with six faces, and an equal angle, or a large rectangular prism termi¬ nated by a bevelment which is somewhat obtuse. The crystals are usually grouped together, and united by their lateral faces j face of the crystals smooth ; exter¬ nal lustre shining j internal weakly shining and pearly j principal fracture foliated, cross fracture fine-grained uneven j fragments but little sharp-edged. Colour :rt I. MINER ;sifica- Colour green, olive green, mountain green, and ion. greenish white ; semitransparent, and sometimes trans- ''•V"-"' parent. Scratches glass slightly. Brittle, and easily frangible. Spec. grav. 2.609 to 2.696. Chem. C/zar.—Fusible before the blow-pipe, into a white porous enamel. Constituent Parts. Silica, Alumina, Lime, Oxide of iron, Water, Magnesia, Loss, Hassenfratz. 5°* 20.4 23-3 4.9 •9 •5 Klaproth. 43*83 3°-33 J8*33 5.66 1.83 0.02 xoo.o 100.00 Localities.—Prehnite was brought first from the Cape of Good Hope, by Colonel Prehn, whose name it now bears. It is also found in France, as in Dauphiny, where it exists in veins. It is not unfrequent in dif¬ ferent parts of Scotland, as among the porphyry rocks six miles to the south oLPaisley; in the neighbourhood of Dunbarton j and in the rocks round Edinburgh. 45. Species. Zeolite. This species has been divided into four subspecies. Subspecies 1. Mealy Zeolite. Zeolite, Kirwan, i. 278. La Zjeolite Farineuse, Bro- chant, i. 298. Mesotype, Hauy, iii. 151. Fxter. Char.—This variety is found massive or dis¬ seminated, and sometimes it is branched or coralloidal, and sometimes also it envelopes other zeolites with a thin crust. It is dull j fracture earthy $ fragments blunt-edged. Colour usually reddish or yellowish white, or flesh red, opaque, very brittle $ does not adhere to the tongue. When scratched with the finger nail it gives out a dull sound. Constituent Parts. Pelletier* Silica, 56 Alumina, 20 Lime, 8 Water, 22 100 Localities, Sic.—This variety of zeolite is found xn Ireland, the Faro islands, and Sweden. It is frequent in different parts of Scotland, as at Dunbar, and seve¬ ral of the Western islands. Subspecies 2. Fibrous Zeolite. Zeolithc Fibreuse, Brochant, i. 299. Mesotype, Hauy* i. 151. Fxter. Char.—This variety is found massive, and sometimes in rounded pieces, composed of capillary cry¬ stals, divergent and radiating; internal lustre glimmer- 3 A L O G Y. 17-5 ing, or weakly shining, pearly or silky £ fraciure fi- Siliceous brous 5 fibres divergent; fragments wedge-shaped. genus. Colour yellowish white, yellowish brown, snow white,1" and sometimes honey yellow, translucent $ semihard, brittle, and easily frangible. Light. Constituent Parts. Meyer, Silica, 41 Alumina, 31 Lime, 11 W'ater, 1 y Loss, 2 100 Subspecies 3. Radiated Zeolite. Zeolithc Payonnee, Brochant, i. 301. Mesotype, Hauy, iii. iji. Essen. Chart'.—Divisible parallel to the faces of a rectangular prism ; electric by heat in two opposite points. Exter. Char.—This variety is found massive, but most frequently crystallized : the primitive form is a rectangular prism with square bases ; its common forms are a rectangular prism, truncated at each extremity by a four-sided pyramid, corresponding to the lateral faces $ a four-sided rectangular prism with two broad and two narrow sides, and also tei-minated by four-sided pyra¬ mids, or a four-sided prism, nearly rhomboidal, the two sharp lateral edges of which, as well as the two ob¬ tuse terminal angles, are truncated. The crystals are united together in bundles ; so that the acuminations only can be seen ; the crystals are commonly smooth and shining y the internal lustre is weakly shining and pearly ; fracture radiated : the rays broad or narrow $ fragments wedge-shaped. Colour yellowish, grayish, reddish, and snow-white 5 translucent,sometimes transparent5 semihard; scratches calcareous spar; brittle, and easily frangible. Spec, grav. 2.0833. Chem. Char.—Before the blow-pipe it froths up, gives out a phosphorescent light, and is converted into a porous enamel. With acids it forms a gelatinous sub¬ stance. Constituent Parts. Silica, Alumina, Lime, Water, Loss, Vauquelin. 50.24 29.30 946 10. 100.00 Subspecies 4. Foliated Zeolite. Zeolithe Lamelleuse, Brochant, i. 302. Stilbite, Hauy in. 161. Essen. Char.—Fusible into a spongy enamel, but not electric by heat. Exter. Char.—This variety of zeolite is usually found in amygdaloidal or globular pieces, and also crystalliz¬ ed ; primitive form of its crystals is a rectangular prism with rectangular bases: the usual forms of its crystals are, T 76 Siliceous genus. MINER are, a short equiangular six-sided prism with two broad, two narrower, and two very narrow laces ; a table with six equal faces, and a rhomboidal prism. Surface of the crystal smooth and shining j internal lustre shining and pearly 5 fracture foliated 5 the plates most frequently curved with a simple cleavage. Colour similar to the former ; it is translucent or semitransparent j semihard, and easily frangible. Spec, grav. 2.5. Chon. Char.—Froths up and phosphoresces, under the blow-pipe ; placed on hot coals, it becomes white and is easily reduced to powder. It is not converted into a jelly by acids. Constituent Tarts. Vauquelim ' Silica, 52 Alumina, 17.5 Lime, 9 Water, 18.5 ’ Loss, 3 100 A L Q G Y. By many mineralogists cbabasie and analcime are considered as one species ; but more nearly investigated, as has been done by Hauy and others, they must ap¬ pear very difierent. The preceding description refers chio#y;to.ana]cime. We shall shortly state the princi¬ pal characters of chabasie from Hauy, iii. 176. Essen. Char.—Divisible into a rhomboid slightly ob¬ tuse, and easily fusible by heat. Exter. Char.-—Chabasie is commonly crystallized. Primitive form of the crystals is a slightly obtuse rhom¬ boid, whose, plane angle at the summit is about 93Y, so that it approaches nearly to the cube; integrant mo¬ lecule is the same. Six of the edges are truncated, the truncations uniting three and three at the two opposite angles, and the remaining six angles are also truncated. It appears also in the form of double six-sided pyramids applied base to base, having the six angles at the base, and the three acute edges of each pyramid truncated. Colour whitish, sometimes reddish, but this seems to be owing to a superficial crust. Lustre shining or re¬ splendent and vitreous. Transparent or translucent. Chcm. Char.—Vs easily fusible before the blow-pipe, and melts into a whitish spongy mass. Part Ctftisifie, tion. Localities, &c.—The different varieties of zeolite are usually found in amygdaloid rocksj basalts, porphyry, slate, wacken, and green stone. I hey olten line the sides of fissures passing through these rocks, and are accompanied with calcareous t spar, calcedony, some¬ times with native copper and native sil\ei, as in Ice¬ land. The finest zeolites are brought from the islands of Faroe, Iceland,, iEdelfors in Sweden. The differ¬ ent varieties, are, not unfrequent in Scotland. 'I he fibrous and radiated kinds are met with extremely beautiful in the islands of Cannay and Skye ; the toh- ated oi’ sjtdbite- in the island of Staffa, m Skye, and in the lead yeins at Strontian. 46. Species. Cubizite. ; La 7.eolithe Cubiquc, Brochant, i. 304. Analcime, S)- Chabasie, Hauy. iii. 180. Essen. Char.—Original forms of the cube, fusible into a glass. Foxier. r-This-mineral is found massive or cry¬ stallized j the form of the crystals is a perfect cube, ■which is its primitive form. This is sometimes truncat¬ ed on all its angles by three small triangular faces, or with twenty-four equal and similar trape/.ouls like the garnet. The external lustre is resplendent, vitreous, or pearly. Internal shining or weakly shining. Fracture imperfectly foliated, almost uneven. Fragments im¬ perfect cubes. _ _ ... Colour white, yellowish, grayish, or reddish white. It is translucent or opaque. Semihard. Spec. grav. about 2 (Hauy). Difficult to produce any signs of electricity j hence the name analcime, signifying want of power, given to it by Hauy. < Chem. Char.—Froths up before the blow-pipe, and melts into a porous glass. . _ Localities, &c.—Cubizite is found in Skye, in Staffa, and in the Salisbury rocks near Edinburgh. Fine spe¬ cimens of cubizite are abundant at the Giants cause¬ way in the north of Ireland. Chabasie is found also at Oberstein in Germany. 47. Species. Cross-stone. Stauroiite, Kirwan, i. 282. Pierre Cruciforme, Bro¬ chant, i. 311. Harmolome, Hauy, iii. 191. Essen. Char.—Divisible into a rectangular octahe¬ dron, which maybe subdivided on the angles contiguous to the summits. Exter. Char.—This mineral is always crystallized. Its usual forms are, a double crystal composed oi two broad prisms, with four rectangular faces, and terminat¬ ed at each extremity by a four-sided obtuse pyramid placed on the lateral edges. These two prisms cross each other -by their broader faces, so that the laces of the acumination meet together, and the double crystal thus formed having four right-angb d re-entering angles, resembles a cross. The crystals are obliquely streaked. External lustre shining and resplendent, vitreous. In¬ ternal weakly shining. Fracture foliated. Colour grayish or milky white, translucent, some¬ times semi-transparent. Semi-hard, scratches glass slightly. Spec. grav. 2.333 to 3.61. _ Chcm. Char.—Before the blow-pipe it is fusible, and froths up. The powder thrown on hot coals is phos¬ phorescent, giving out a greenish yellow light. Constituent Parts. Klaproth. Tassaert. Silica, 49 47-5 Barytes, 18 16 Alumina, 16 19.5 Water, IJ I3-S Loss, a 3*5 100 100 Localities.—This mineral has been found in veins at Andreasberg in the Hartz, accompanied by carbonate of lime, from which it is sometimes called andreolite. It is also found in the lead veins at Strontian in Scot¬ land, and in balls of agate at Oberstein. In the latter place, crystals are single. 48. Species 2 MINERALOGY. rt I. ijsiiica- :ion. 48. Species. Laumonite. Zcvlithc Effloj'escente, Hauy, iv. 410. Id. RrocJicinty n. 530. Exter. Char.—This mineral is found in masses which are composed of irregular groups of crystals crossing each other in all directions. Form of the crystals is a four-sided prism, nearly rectangular, and terminated by a base inclined to one of the lateral edges under an angle of 1330; frequently the acute angle is truncated, and thus terminating in a bevelment placed on the acute lateral edges. The lateral faces are longitudinally streak¬ ed, and the lustre is shining. The faces of the summit are also shining, but smooth. Fracture foliated, and parallel to the lateral faces. Colour grayish white, somewhat pearly. Is translu¬ cent, rather soft $ sectile, and easily frangible. But all these characters are considerably different by the action of the air. The whole mass is gradually se¬ parated, and the crystals become opaque, falling into friable folia, which are in a short time reduced to a snow-white powder, from which it derives the name given to it by Hauy. Chcm. Char.—Fusible before the blow-pipe, without frothing up, into a white enamel, and forms a jelly with acids. Localities.—This mineral W'as found in 1788 by Gillet Laumont, in the lead mines of Iluelgoet in Brittany in France, and from him it derives its name. It forms a small vein contiguous to the vein of galena. We have collected specimens of a mineral, whose cha¬ racters correspond with laumonite, in a vein traversing a basaltic rock in the island of Skye. After being kept for some years it appeared equally liable to disintegra¬ tion by exposure to the air. 49. Species. Dipyre. Id. Brochant, ik 508. Id. Hauy, iii. 242. Essen. Char.—Divisible parallel to the faces of a re¬ gular 6-sided prism. Fusible with intumescence. Exter. Char.—This mineral is found in small fasci¬ cular masses or crystals. Lustre shining, vitreous. Longitudinal fracture foliated. Colour grayish or reddish white, and sometimes pale rose red. Semi-hard j scratches glass, and is easily' frangible. Spec. grav. 2.630. Chem. Char.—Fusible. The powder thrown on hot coals produces phosphorescence. Constituent Parts. Vauquelin. Silica, 60 Alumina, 24 Lime, 1 o Water, 2 Loss, 4 10O Localities, &c.—This mineral has only been found at Mauleon, in the Pyrenees, in a rock of steatites. It was discovered by Lelievre and Gillet Laumont, in 1786. Vol. XIV. Part I. f 50. Species. Natrolite. Id. Klaproth. Id. Brongniart, i. 370. 'I77 Siliceous genus. Exter. Char.—This mineral is found in masses, in a rock of amygdaloid. External surface somewhat rough j internal lustre glimmering j fracture fibrous and radia¬ ted. Colour browmish yellow, inclining to olive, and dif¬ ferent colours appear in parallel and w'aved zones; is translucent at the edges ; scarcely scratches glass $ is easily frangible. Sp. grav. 2.16. Chcm. Char.—Is reduced by the blow-pipe to a white glass. Nitric acid produces no efiervescence, but con¬ verts it in a few hours to a thick jelly. Constituent Parts. Klaproth. Silica, 48 Alumina, 24 Soda, j 6 Water, 9 Oxide of iron, 1.73 Loss, 1.73 100.00 Localities, &c.—Natrolite has been found only at Boegau, near the lake of Constance in Switzerland, in the cavities of an amygdaloid rock. The name is de¬ rived from natron or soda, of which it contains so large a proportion. 51. Species. Azurite. La%ulite, Klaproth, Analyt. Essays, i. 170. Le La-zu- lithe, Broch. i. 313. Exter. Char.—This mineral has been found dissemi¬ nated, massive, and crystallized in rectangular four¬ sided prisms. Lustre glimmering and shining. Frac¬ ture imperfectly conchoidal. Colour indigo, Prussian, or deep smalt blue ; streak lighter blue ; nearly opaque, or translucent at the edges $ hardness, nearly that of quartz. Brittle and easily frangible. Chcm. Char.—Infusible before the blow-pipe, but loses its colour, becomes earthy, and of a clear gray. With borax it produces a bright yellow glass. Acids have a very feeble action upon it. Klaproth ascertained that it is composed of silica, alumina, and oxide of iron j but the quantity which he operated on was too small to ascertain the proportions. Localities, See.—This mineral lias been found at Vorau in Styria, in a rock of micaceous schistus, w here it forms, along with grayish quartz and silvery white mica, a vein of about half an inch thick. 52. Species. Lazulite. Lapis Lazuli, Kirw. i. 283. La Pierre d'Azurc, Broch. i. 313. Lazulite, Hauy. iii. 143. Exter. Char.—This mineral is found massive, dissemi¬ nated, and in rounded fragments ; internally dull, and rarely glimmering. Fracture earthy, or fine-grained uneven ; fragments sharp-edged. C61 oar / l78 Siliceous genus. MINER epaque, or translucent on the Colour azure blue j - edges j hard, or semihard $ brittle and easily frangible. Spec. grav. 2.76 to 2.94- Chem. Char.—It retains its colour at the temperature of ioo° Wedgewood j but with a stronger heat froths up into a yellowish hard coloured mass. By increasing the heat, it changes to a white enamel; with acids after calcination, forms a jelly. A L G G Y. Constituent Parts Davy, Isich. Jour. xi. 153 Part Classitic Constituent Parts. Alumina, Silica, Lime, Oxide of iron, — Water, 26.2 A portion of fluoric acid, 70. 1.4 Gregor, ibid. xiii. 24“ 58.7° tion. •30 12 37 l9 75 Klaproth. Analyt. Ess i. 169. Silica, 46 Alumina, 14.5 Carbonate of lime, 28 Sulphate of lime, 6.5 Oxide of iron, 3 Water, 2 Localities, &c.—This mineral was first discovered by Dr Wavell, in a quarry near Barnstaple. Mr Hatchett found it, in 1796, filling the cavities and veins of a soft argillaceous schistus. It has since been found in Stenna-Gwyn mine, in the parish of St Ste¬ phen’s, Cornwall, where it is accompanied with sulphu¬ r'd of tin, copper, and iron. 100.0 Localities, &c.—-This mineral is found in Persia, Natolia, and China, and it is supposed that its re¬ pository is among granite. It has been found also in Siberia, near the lake Baikal, where it forms a vein along with garnets, feldspar, and pyrites. It is fre- quentlv mixed with pyrites, and a grayish white feld- spar. Uses.—This stone, when it is of a fine blue colour, and free from white spots, is held in great estimation for various ornamental purposes •, but it derives its greatest value from its use in painting. The colour which it furnishes is called ultramarine. To prepare it, the stone is first calcined, and then reduced to an impalpable powder, which is mixed with a paste com¬ posed of resinous matters, of wax and linseed oil. f rom this mixture a powder is obtained by washing, which being dried affords the colouring matter. Ilns^ colour, when used in painting, is not susceptible of change. 53. Species. Hydrargillite. Wavellite of Dr Babington and others. Exter. Char.—This mineral is found crystallized. The crystals are very minute, and are attached to quartz, in tufts or bundles, which diverge from a com- ,mon centre. It is also found closely compacted to¬ gether, in the form of mammillary protuberances ot the size of small peas, and adhering to each other. The crystals, when magnified, appear to be four-sided, and, when broken, the section seems to be rhomboidal. The crystals have sometimes the appearance ot fine down, and sometimes are of the size ot a hair. Lustre silky. The colour is white, with a shade of gray or green j usually opaque, and sometimes semitranspa¬ rent. The texture is loose but the small fragments are so hard as to scratch agate. Spec. grav. 2.25 to 2.7°. Chem. Char.—Infusible before the blow-pipe j but the crystals, exposed suddenly to strong heat, decrepi¬ tate. 54. Species. Andalusite. Adamantine Spar, Kirwan, i. 337. Spath Adamantin, Bournon, Jour, de Phys. 1789. Feldspath Apyre, Hauy, iv. 362. Exter. Char.—This mineral is found massive, and crystallized in rectangular four-sided prisms, the sum¬ mits of which are obliterated. Lustre weakly shining and resinous. Longitudinal fracture foliated. Cross fracture a little splintery. Colour reddish brown or violet j translucent at the edges. Very hard ; scratches quartz, and sometimes even spinelle. Difficultly fran¬ gible. Spec. grav. 3.165. Chem. Char.—Infusible before the blow-pipe. Localities, &c.—This mineral was first discovered by Bournon in the granitic rocks of f orez, where it occu¬ pies a vein of common feldspar. It has been found al¬ so in Spain, where it enters into the composition of a ranite. It is also met with in Aberdeenshire. When rst discovered it was supposed to be a variety of ada¬ mantine spar, or corundum 5 but its inferior spec. grav. and the difference in the structure of its crystals, afford sufficient characteristic differences. V 55. Species. Feldspar. This species is divided into the five following subspe¬ cies : 1. Adularia. 2. Labradore stone. 3. Common feldspar. 4. Compact feldspar. 5. Hollow spar. Subspecies 1. Adularia. Moonstone, Kirwan, i. 322. UAdulaire, Brochant, i. 371. Eeldspath Nacre, Hauy, ii. 606. Exter. Char.—This mineral is found massive or cry¬ stallized. The forms of its crystals are, 1. A four-sided rhomboidal prism. 2. A perfect rhomb, more or less oblique. 3. A rectangular four-sided table, with ob¬ lique terminal faces. 4. A six-sided prism. 5. A six- sided table. Surface of the crystals smooth or longitu¬ dinally streaked. Lustre shining or resplendent. Inter¬ nal lustre resplendent, vitreous, or pearly. Fracture foliated. Cleavage double. Fragments rhomboidal. Colour yellowish, greenish, or milk-white : is some¬ times |rt I. MINERALOGY. s;gca. times chatoyant. Is always translucent; sometime^ sc¬ on. mitransparent. Hard ; scratches common feldspar, '•■v'—*'Brittle, and easily frangible. Spec. grav. 2.500 to 2.561. Chem. Chat\—Adularia before the blow-pipe cracks and splits, and then melts into a white glass. Constituent Parts. Silica, Alumina, Lime, Potash, Magnesia, Oxide of iron. Sulphate of barytes, Water, Loss, Yauquelin. 64 20 2 14 Westrurab. 62. CO 17.50 6.5® 6. 1.40 2. •25 3.85 100.00 Subspecies 3. Common Feldspar. JTt/. Kirwan, i. 316. Le Feldspath Commuti, Brochant, i. 362. Feldspath, Hauy, ii. 590. Fxter. Char.—Feldspar is found massive, disseminat¬ ed, in rounded pieces, or crystallized. Its forms are, 1. A broad six-sided prism with unequal angles, termi¬ nated at each extremity by an obtuse bevelment, whose faces are placed on the two lateral edges. 2. A four¬ sided rhomboidal prism. 3. A four-sided rectangular prism, having the lateral edges sometimes truncated ; and, 4. A six-sided table. Double crystals are some¬ times met with. Lustre shining; internal lustre also shining; sometimes resplendent, vitreous or pearly. Fracture perfectly foliated ; fragments rhomboidal. Colours milk-white, yellowish, grayish, reddish, ami greenish. Translucent; scratches glass ; brittle, ami easily frangible. Spec. grav. 2.437 to 2.704. Chem, Char.'—Before the blow-pipe melts into a white glass. 179 Siliceous genus. Localities, &c.—This mineral was first found by Pi- Mi in one of the summits of St Gothard in Switzerland ; this summit is called Adula, and from this it takes its name. It is said that it forms particular beds, inter¬ posed between micaceous schistus and gneis. It is ac¬ companied with quartz, mica, and common feldspar. Subspecies 2. Labradore Stone. Id. Kirwan, i. 324. La Piet're de Labrador, Bro¬ chant, i. 369. Feldspath Opalin, Hauy, ii. 607. Extcr. Char.—This mineral is found massive, and in rounded pieces. Internal lustre shining, sometimes re¬ splendent; pearly, or vitreous. Fracture perfectly fo¬ liated, with a double cleavage. Colour most commonly dark or deep ash gray; but by varying its position it reflects dift’erent colours, as blue, green, yellow, brown, and red ; and these colours exhibit stripes, spots, and dots. It is strongly translu¬ cent. Spec. grav. 2.6 to 2.7. Chem. Char.—Before the blow-pipe fusible into a white enamel. Constituent Parts. Bindheim. Constituent Parts. Vauqueliu. Silica, 62.83 Alumina, 17.2 Lime, 3. Oxide of iron, x. Potash, 13. Barytes, — Magnesia, — Loss, 3.15 1-00.00 Kirwan. Chenevix. 67 64. 14 24. 6.25 2. II 8 3-75 100 100.00 Localities, Sac.—Feldspar is one of the most common substances, and the most universally distributed in na¬ ture. It does not exist, however, in large masses. It forms one of the component parts of granite, gneis, sye¬ nite and porphyry. When exposed to the action of the air, it is very li¬ able to decomposition, and then it is converted into a white earthy mass, which is employed in the manu¬ facture of porcelain. This is the kaolin of the Chi nese. Silica, Alumina, Sulphate of lime, Oxide of copper, Oxide of iron, Loss, 100.00 Localities, &c.—This stone was first brought from the island of St Paul, near the coast of Labradore, whence its name. It has been since found in Bohemia, and near the lake Baikal in Siberia. It is rarely found in its native repository, but it is supposed to belong to pri¬ mitive rock ; for it is accompanied with schorl, mica, and hornblende. Uses.—The brilliancy of its colours, and particularly its chatoyant property, have brought it into use in jewel¬ lery. Subspecies 4. Compact Feldspar. Continuous Feldspar. Kirw. i. 323. Le Feldspath Com- pacte, Broch. i. 367. Feldspath Compacta Bleu, Hauy, ii. 605. Ester. Char.—This variety is found massive, and ak so in rounded pieces. Lustre weakly shining, or only glimmering. Fracture imperfectly foliated, sometimes splintery. Fragments not very sharp edged. Colour bluish white, greenish or yellowish ; translu¬ cent, but sometimes only at the edges. Streak white ; is scratched by quartz. Chem. Char.—Fusible before the blow-pipe. Localities, &c.—Compact feldspar is found in Sax¬ ony, and in the Tyrol. It is not uncommon in Scot¬ land, as in the Grampian mountains, and on the Pent- land hi'ls in the neighbourhood of Edinburgh. The crystals of feldspar observed in antique green porphyry, are supposed to belong to this variety. Z 2 Subspecies 69 5 13.6 •3 3-90 MINE fl A L O G Y. 1B0 Siliceous genus. Subspecies 5. Hollow Spar, or Chiastolite. Made, Broch. 11. 514. Id. Hauy, Hi. 267. Essen. Chav.—Divisions parallel to the faces of a prism, slightly rhomboulal. A. black, substance sui* rounded by another of a whitish colour. Exter. Char.—This mineral lias been found only cry¬ stallized in four-sided, nearly rectangular prisms. The summit is always broken, by which the arrangement of the two substances is observed. The white part is the outermost; the black matter forms in the centre a small prism, whose sides correspond with those of the outer crystal. From the angles of the central prism proceed four narrow lines, which extend to each ot the angles of the outer prism 5 and sometimes this black substance forms at the extremity of these lines, or in the angles of the large prism, a similar small prism of black mat¬ ter. The black matter is an argillaceous schistus, simi¬ lar to the repository of the crystals. The white part is sometimes weakly shining ; internal lustre glimmer¬ ing, resinous. The black part is'nearly dull. Fracture foliated ; the black part earthy. The colour of the white part, yellowish, or grayish white ; that of the black part, grayish, or bluish black. Opaque, or translucent, Semihard: scratching glass when foliated. Streak white. Brittle ; not very fran¬ gible. Spec. grav. 2.944. Communicates to sealing wax, negative electricity by friction. Chart. Char.—Before the blow'-pipe, the white part melts into a whiter glass ; the black part into a black glass. localities, &c.—This mineral has been found in Brittany in France, imbedded in argillaceous schistus j in the Pyrenees, in a similar rock, lying immediately on granite, near St Jacques de Compostella in Spain j and in the mountains of Cumberland, also imbedded in argillaceous schistus. The name chiastolite is derived from the appearance of the section of the crystal, which is supposed to have some resemblance to the Greek letter %. 56. Species. Scafolite. Scapolithe, Brochant, ii. 526. Id. Hauy, iv. 493. Rapi- dolithe, Abilgaard. Exter. Char.—This mineral has been found massive, but most frequently crystallized in rectangular, four- sided prisms, having the lateral, edges truncated. The crystals are small, sometimes acicular, commonly elon¬ gated and aggregated. Their surface is longitudinally streaked and glimmering. Internal lustre weakly shin¬ ing,, vitreous or resinous. Fracture foliated. Colour grayish white 5 translucent, or rarely transpa¬ rent. Scratches glass, and is brittle. Spec. grav. 3.68 to 3.70. Chem Char.—Froths up before the blow-pipe, and melts into a white enamel. Localities, &c.—This mineral has been found in the mines of iron ore near Arendal in Norway. The cry¬ stals are mixed with mica and calcareous spar. Part! 57. Species. Arctizite. Ckssific; tion. Wernerite, Hauy, Hi. 119. Id. Brochant, ii. 529. Essen. C/wr.—Spec. grav. 3.6. Phosphorescent by heat, but not by percussion. Exter. Char.—This mineral is found massive, or cry¬ stallized in four-sided rectangular prisms, terminated by an obtuse four-sided pyramid. The lateral^ edges are truncated, so that the prism appears to be eight-sided. Crystals small j lustre resplendent, sometimes weakly shining, and pearly or resinous. I racture foliated. 10- lia curved in two directions. Colour between pistachio green and isabella yellow. Translucent. Scratches glass, and strikes fire with steel. The powder thrown on hot coals phosphoresces in the dark. Chem. Char.—Before the blow-pipe it froths up, and easily melts into an imperfect white, and opaque ena¬ mel. Insoluble in nitric acid. Localities, &c.—This mineral is found in the iron mines of Northo and Ulrica in Sweden. Bouoen near Arendal in Norway, and at Campo Longo in Switzerland. 38. Species. Diasporet. Id. Brochant, ii. 507. Id. Hauy, iv. 358. Exter. Char.—This mineral is of a gray colour. Lustre shining, pearly. I racture foliated, with the folia a, little curved ; separates into rhomboids, with' angles about 130° and 50°; scratches glass. Spec, grav. 3.432. Chem. Char.—A fragment of this stone heated for a little in the flame of a candle decrepitates and disper¬ ses in all directions ; from this property is obtained its name, which signifies to disperse. Heated in a close crucible to prevent the fragments from flying off, they were reduced to white shining particles, somewhat re sembling boracie acid. Constituent Parts. Yauquelin. Alumina, 80 Oxide of iron, 3 Water, 17 100 Localities^ &c.—The repository of this mineral is unknown. It was connected with an argillaceous, ochrey rock. - This mineral approaches nearly to hydrargillite or wavellite, described above, in its constituent parts } but the proportions and some of the external characters are different. 59. Species. SPODUMENE. Id. D’Andrada, Jour, de Phys. an 8. p. 240. Triphane, Hauy, iv. 407. Id. Brochant, ii. 528. Exter. Char.—This mineral is found in small masses, which present some appearances of crystallization. Lus¬ ter shining, pearly. Fracture in the mass radiated, 01 singb irt I. MINER assifica- single crystals foliated and divisible in three directions, tion. which sometimes afford an oblique angled prism of about ioo° and 8o°. Cross fracture dull, rough, and splintery. In larger masses the fracture is radiated. Lustre shining pearly. Scratches glass. Colour greenish white or leek green. Translucent at the edges. Brittle. Spec. grav. 3.192 to 3.218. Chem. Char.—Before the blow-pipe it separates at first into small yellowish plates, and then melts into a grayish white transparent glass. Constituent Parts. Vauquelin. Silica, 56.5 Alumina, 24 Lime, _ 5 Oxide of iron, 5 Loss, 9.5 100.0 Localities, &c.— This mineral has been found in the mines of Utoe near Dalero in Sweden. Its repository seems to be a vein, where it is accompanied with quartz, and black mica. The name triphane has been given to this mineral by Hauy from its peculiar three-fold natural divisions. It received the name spodumene, which signifies covered with ashes from iJ’Andrada. 60. Species. Meionite. Id. Hauy, ii. 586. Id. Brochant, ii. 519. Essen. Char.—Divisible parallel to the faces of a prism with square bases. Easily fusible into a spongy white glass. Exter. Char.—It is found crystallized in four-sided rectangular prisms whose lateral edges are always trun¬ cated. It is terminated by an obtuse tour-sided pyramid set on the lateral edges. Sometimes the lateral edges are doubly truncated, thus forming a sixteen-sided prism. The crystals are small, adhering laterally and arranged in rows to the matrix. Lustre shining, vitreous. Longitudinal fracture foliated, and parallel to the four faces of the prism. Cross fracture slightly conchoidal. Colour grayish white. Semi-transparent. Scratches glass. Chcm. Char.—IVIelts very easily before the blow-pipe with considerable intumescence accompanied with a hissing noise. Localities, &c.—This mineral has only been found on ’Vesuvius near Mount Somma. The crystals are usual¬ ly attached to fragments of foliated limestone. 61. Species. SoMMITE. Hephehnc, Hauy, iii. 186. Id. Brochant, ii. 522. Essen. Char.—Divisible parallel to the sides and bases of a regular six-sided prism. With difficulty scratches glass. Exter. Char.—This mineral is found disseminated in grains or in small crystals, which are commonly perfect six-sided prisms. '1 he lateral faces are smooth and shining with a vitreous lustre. Longitudinal fracture foliated. Cross fracture conchoidal and shining. Co¬ lour grayish white. Translucent, rarely semitranspa- A L O G Y. 181 rent. The sharp points scratch glass, the others leave Siliceous only a white trace. Easily frangible. Specific gravi- genus ty 3.2441. _ t ' Chem. Char.—Fusible into a glass by long continued heat. Becomes opake in nitric acid, hence the name nepheline, signifying cloudy, given to it by Hauy. Constituent Parts. Vauquelin. Silica, 46 Alumina, 49 Lime, 2 Oxide of iron, 1 Loss, 2 IOO Localities, &c.—This mineral is found lining the- cavities of rocks on Mount Somma, from whence its name sommite. It is accompanied with vesuvian and black schorl, all which are supposed by some to be ejec¬ ted matters from Vesuvius. 62. Species. Ichthyophthalmite. Id. D’Andrada. Ichthyophthalme, Brochant, ii. 552. Apophyllite, Hauy. Id. Brongniart, i. 385. Exter. Char.—This mineral is found massive, and crystallized in rhomboids which approach nearly to the cube 3 in thick six-sided tables, and in rectangular four-sided tables, with truncated edges. Lustre shin- ing, pearly. Fracture foliated j cleavage single; cross' fracture fine grained uneven, and weakly shining. Colour yellowish or greenish white; translucent or semitransparent. Scratches glass; not easily frangible. Spec. grav. 2.46. Chem. Char.—Exposed to the blow-pipe, is with difficulty reduced to a white enamel. In nitric and muriatic acids it forms a jelly. Constituent Parts. Silica, Lime, Potash, Water, Fourcroy and Vauquelin. 5r 28 4 *7 100 Localities, &c.—This mineral is found in the iron mine of Utoe in Sweden, imbedded in a violet-colour¬ ed limestone, and accompanied with greenish hornblende and oxide of iron. IV. ARGILLACEOUS Genus. 1. Species. Native Alumina. Native Argil, Kirw. i. 175. VAlumine Pure, Bro¬ chant, i. 318. Exter Char.—This mineral is found in kidney-form masses ; it has no lustre ; fracture earthy ; fragments blunt edged. Colours snow or yellowish white ; opaque; stains a little ; tender or triable; adheres a little to the tongue, feels meagre ; gives out an earthy smell when breathed on. Spec. grav. 1.305 to 1.66.. Client. i82 MINER Argillacc- Ehcm. Char.—Before the hlow-pipe is absolutely in- oiis genus, fusible, but dissolves almost entirely in acids. Constituent Parts. Fourcroy. Alumina, 45 Sulphate of lime, 24 Water, 27 Lime and silica, 4 100 But according to the analysis of others, it is composed almost entirely of pure alumina, "mixed only with a small proportion of lime and silica. Localities, &c.—It is found at Halle in Saxony, in part of the garden belonging to the college, immediate¬ ly under the soil; but being only in small quantity, and in the neighbourhood of a large laboratory, has led to the supposition that it is an artificial production. It is said that it has been also found at Magdeburg in Lower Saxony, in Silesia, near Verona, and in England. 2. Species. Porcelain Earth. Porcelain Clay, Kirw. i. 178. La Terra Porcelaine, Brochant, i. 320. Argile Kaolin, et Feldspath Ar~ gillifarme, Hauy, ii. 616. Extcr. Char.—This mineral is found massive, or dis¬ seminated j has no lustre ; stains strongly ; has little co¬ herence ; adheres a little to the tongue. Colour reddish, yellowish, or grayish white. Chan. Char.—Infusible in the strongest heat of a furnace. Constituent Parts. Vauquelin. Silica, 55. 71-15 Alumina, 27- Lime, 2. 1-92 Oxide of iron, .5 Water 14. 6.73 Loss, 1.5 4-34 100.0 100.00 Localities, &c.—This mineral is found in consider¬ able abundance in beds and veins, in granite and gneis, especially when the proportion of feldspar is consider¬ able. It abounds in China and Japan, where it is known by the name of kaolin ; in Bohemia, Saxony, Denmark, and particularly in many places of France, as at Limoges and Bayonne, and in Cornwall in Eng¬ land. In many cases it seems to be owing to the de¬ composition of granite. Uses.—Porcelain earth, as its name imports, is em¬ ployed either as it is found nati ve, or mixed in certain proportions with other earths, in the manufacture of por¬ celain. That from Limoges in France is employed without any addition. 3. Species. Common Clay. This species is divided into five subspecies : 1. loam; 2. pipe clay ; 3. potters clay ; 4. variegated clay ; and^ 5. slaty clay. A L O G Y. Part ,, , T Classific Subspecies 1. Loam. iion Exter Char.—This mineral is found massive and in ^ great abundance ; has no lustre ; fracture uneven or fine earthy; fragments very blunt-edged ; has little coherence ; stains. Colour yellowish-gray, or spotted -with yellow and brown, feels somewhat greasy, and adheres strongly to the tongue. Localities, &c.—Loam is found in great abundance every where, and perhaps it ought to be considered as a mixture of different substances, rather than as a sim¬ ple mineral. Subspecies 2. Pipe Clay. Exter. Char.—This variety is found in great masses; has scarcely any lustre ; fracture fine earthy, or fine grained uneven j fragments sharp-edged ; has some co¬ herence. Colour grayish or yellowish white; streak shining ; feels greasy, adheres strongly to the tongue, and is easily frangible. Localities, &c.—It is very abundant in most countries, and is usually found in alluvial land. Subspecies 3. Potters Clay. Id. Kirw. i. 180. Argile a Poticr, Brochant, i. 322. Exter. Char.—This variety is also found massive, and in great abundance. It is intermediate between solid and friable ; has no lustre j fracture fine grained ear¬ thy, sometimes coarse grained uneven; fragments blnnt- edged. Colour yellowish, greenish, or grayish white ; some¬ times reddish or ochrey yellow of various shades. It is opaque, stains a little ; streak a little shining ; very brittle, and easily frangible ; is somewhat ductile ; ad¬ heres a little to the tongue, and feels greasy. Chan. Char.—Is differently affected by the blow¬ pipe, according to the proportion of the different sub¬ stances of which it is composed ; but in general is diffi¬ cult of fusion. Effervesces with acids when the pro¬ portion of lime is considerable. Constituent Pai'ts. Vauquelin. Silica, 43.5 Alumina, 33*2 Lime, 3.5 Oxide of iron, 1. Water, 18. Loss, .8 100.0 The proportions of silica and lime vary consider¬ ably ; the silica is very often the predominant ingredi¬ ent. Kirwin examined a potters clay, in which. he found 63 parts of silica. Localities, &c.—Potters clay is found in great abun¬ dance in most countries, and in similar situations with the former. It often forms thick beds in alluvial land, alternating with beds of sand. Subspecies 4. Variegated Clay. Exter. Char.—This mineral is found massive. Has an 4 art I. MINER assifica- an earthy fracture, a shining streak, and is soft or fri- tion. able. —v——* The colour is white, red, or yellow, and these dif¬ ferent colours are sometimes in stripes, veins and spots. Adheres a little to the tongue, and feels somewhat greasy. It is sectile and light. As this variety of clay forms with water a less tena¬ cious mass than some of the other varieties, it probably contains a greater proportion of siliceous earth. Localities, &c.—This mineral is found in Upper Lu- satia. Subspecies 5. Slaty Clay, Slate Clay, Shale, Kirwan, i. 182. L'Argile Schis- teuse, Brochant, i. 327. Argile Schisteuse Impres- sionSe, Hauy, iv. 448. Exter Char.—This subspecies is found massive j in¬ ternally dull, when free from mica ; fracture slaty or earthy ; fragments in tables. Colour grayish, yellowish, or blackish, sometimes reddish or brownish 5 opaque 5 soft, sectile, and easily frangible. Adheres to the tongue j feels meagre. Sp. grav. 2.6 to 2.68. Localities, &c.—Usually accompanies coal, so that it abounds in all coal countries. It is sometimes mix¬ ed with sand, mica, and iron pyrites. It is known in this country under the name of shale, and in Scotland particularly by that of till, or described under the more general denomination of one of the coal metals. Slaty clay is still farther distinguished by impressions of ferns, reeds, or grasses. When it is of a black colour, it seems to be owing to a greater proportion of coaly matter. 4. Species. Clay Stone, or Indurated Clay'. Indurated Clay, Kirwan, i. 181. DArgile Endurcie, Brochant, i. 3 25. A L O G Y. 5. Species. Adhesive Slate. Lc Schiste a Polir, Brochant i. 376. Schiste a Polir, Hauy, iv. 449. Polishing Slate, Klaproth, i. 455. Analyt. Ess. Transl. Exter. Char,—This mineral is found massive j is al¬ ways internally dull j has a slaty or fine earthy frac¬ ture j fragments slaty or in tables. Colour clear gray, whitish or reddish j opaque or slightly translucent at the-edges j gives a shining streak 5 is sectile, soft, and very easily frangible j ad¬ heres strongly to the tongue: feels meagre. Specific gravity 2.08. Chem. Char.—Immersed in water, adhesive slate ab¬ sorbs it greedily, air bubbles being rapidly disengaged and with noise j but does not become tenacious. When reduced to powder and calcined, it loses about one-fifth of its weight. Exposed to strong heat, it is converted in¬ to a dark gray or yellowish and porous slag. (Brochant). Constituent Parts. Klaproth. 66.5 I. Silica, Alumina, Magnesia, Lime, Oxide of iron, Carbone, Water and air, Loss, 62.5 7 8 1.25 2-5 22. 19. 2.25 100.00 100.0 Localities, &c.—Adhesive slate forms considerable beds at Menil-Montant near Paris. In these beds me- nilite already described is found. 183 Argillace¬ ous genus. Exter. Char.—Indurated clay is always found mas¬ sive j it is dull j fracture compact, or fine earthy; but sometimes splintery or even, and also sometimes slaty. Fragments more or less sharp edged, and sometimes in tables. Colour usually bluish, yellowish, or greenish gray, and sometimes pearl gray, grayish red, whitish, and brownish. These colours are often mixed, and are ar¬ ranged in spots and stripes. Opaque, soft, rather brittle ; easily frangible ; adheres slightly to the tongue ; feels greasy. Spec. grav. inconsiderable. Gradually sails to pieces in the water, or crumbles into powder. Has but little ductility. Localities, &c.—Indurated clay is very common. It as found in veins, and sometimes in very extensive beds. It constitutes the basis of many porphyries, especially in Saxony, where it is abundant. It is found in many parts of Scotland, as on the Pentland hills in the neigh¬ bourhood of Edinburgh. Stourbridge clay, according to Mr Kirwan, may be included under this variety. It is of a gray colour ; does not adhere to the tongue ; part is soon diffused in water, and another part falls into powder. Mr Kiir- wan found it to contain 12.5 of moisture, 12 of a coarse white sand, 30 of a fine brownish sand, and even the remaining or argillaceous part was not entire¬ ly freed from sand but by boiling in acids. 6. Species. Polishing Slate. Le Polierschicfer, Brochant, i. 376. Exter. Char.—This mineral is found massive ; inter¬ nally it is dull. Fracture slaty, but in some directions earthy. Fragments slaty or in tables. Colour yellowish gray or white; and different co¬ lours appear disposed in stripes ; is soft; adheres to the tongue ; feels meagre, and is rather light. Localities, &c.—This mineral has been found only, it is said, in Bohemia, near pseudo volcanoes, and it is sup¬ posed, that it is nothing more than indurated coal-ashes. It approaches so near in the characters that are given of it to the following, that it might be included under the same species, or considered as a variety of it. 7. Species. Tripoli. Id. Kirw. ii. 202. Le Tripoli, Broch. i. 379. Quartz, Aluminifete Tripoleen, Hauy, iv. 467. Exter. Char.—This mineral is found massive; is dull internally ; has a coarse earthy fracture, sometimes slaty; fragments blunt-edged. Colour yellowish gray, and sometimes brownish red. Is soft and somewhat friable ; meagre to the feel, but does not adhere to the tongue. Chem. Char.~—\t is almost infusible before the blow- pipe. 134 MINE Argillace- pipe- I<- melts with borax without frothing up. ousgetms. does not form a paste with water. K ■it Constituent Parts. Haasse. A L O G Y. Part:! been supposed that the excellence of the alum is owing Ciassificaji to the mineral containing within itself all the ingredients [ lion necessary in the formation of that triple salt. Silica, Alumina, Oxide of iron, 90 7 3 10. Species. Aluminous Schistus. This is divided into tv/o varieties or subspecies 5 1, common *, and, a. shining. 100 Localities,&c.—This substance Was formerly brodght to Europe from Tripoli 5 hence tne name j but it Iras since been found in many other places, as in Bavaria, Saxony, and Bohemia ‘y in B.ussia and in England.. It is found in the neighbourhood of basalts, sometimes forming veins j at Potschappel it is disposed in beds among the strata of coal, and neat those places where strata of coal have been on fire. Uses.—Tripoli is employed in polishing metals, pre¬ cious stones, and glasses for optical instruments. 8. Species. FloatstonE. Exter. r/iar.-^-This mineral has been found in tu¬ berose porOus masses ; it is dull, has an earthy fracture, and blunt-edged fragments. The colour is yellowish gray or grayish white. It is soft and brittle 5 rough to the feel, and gives out a creaking sound. It is very light, from which it has its it name. Localities, &c.—Has been only found at St Omcrs near Paris. 9. Species. Alum Stone. 'La Pierre Alumineuse, Broch. i. 381. Exter. Char.—This stone is found massive ; is ge¬ nerally dull, rarely a little glimmering 5 fracture un¬ even, sometimes splintery } fragments not very sharp- edged. Colour grayish or yellowish white : it is soft, and Sometimes semihard 5 stains a little, and adheres to the tongue. Chem. Char.—This mineral does not effervesce With acids 5 but after being heated and dissolved in water, it affords alum. According to Bergman it contains 43 of sulphur, 35 of alumina, and 22 of silica ; but the fol¬ lowing is the result ot Vauquelin’s analysis. Constituent Parts. Alumina, 43‘92 Silica, 24. Sulphureous acid, 25. Sulphate of potash, 3.08 'Water, 4 100.00 Localities, See.—This mineral has been long known under the name of the stone of Tolfa, from the name of the place where it is found near Borne, and where it forms a mountain which is traversed by veins of whitish gray quartz. It is from this stone that the Roman alum, so celebrated in commerce, is manufactured 5 and it has Subspecies 1. Common Aluminous Schistus* Lc Schiste Alumineux, Broch. i. 386. Exter. Char.—This mineral is found in masses, which often contain pieces of a globular form4 It is some¬ times glimmering, amd sometimes dull} fracture com¬ monly slaty, and sometimes a little earthy •, fragments in tables j streak the same as the colour ot the mineral, a little shining. Colour grayish black or brownish } is soft 5 meagre to the feel, and easily frangible. Chem. Char.—When exposed to the air for some time it separates and 'yields alum by lixiviation. Localities, Sec.—Aluminous schistus is abundant in Saxony, Bohemia, France, England, and some parts of Scotland. It is disposed in beds among stratiform rocks, and in transition rocks, and it is often traversed by veins of quartz. Being mixed with pyrites, the decom¬ position is thus promoted when exposed to the air. Uses.—This mineral is dug out lor the purpose of ex¬ tracting alum, first by exposing it to the air or heat, and then by lixiviation. Subspecies. 1. Shining Aluminous Schistus. Lc Schiste Alumineux Eclatant, Broch. i. 388. Exter. Char.—This mineral approaches very nearly to the former in most of its characters, but in the di¬ rection of its principal fracture the external surface is smooth 5 lustre shining, or resplendent, resinCuS, and even sorUewhat metallic ; in the opposite directions it is dull. Fracture commonly slaty, and somewhat curved j fragments in tables. Colour intermediate between bluish and grayish black, and sometimes iron black. Colours in the rents iridescent. In other characters and circumstances it resembles the fdrmer. 11. Species. Bituminous Sckistus. Lc Schiste Bitumineux, Broch. i. 289. Bituminous Shale, Kirw. 183. Exter. Char.—This mineral is found massive 5 lustre glimmering j fracture most commonly thin, raxely thick j fragments in the form of tables, sonietitnes tra¬ pezoidal. . Colour brownish black, sometimes gray or blackish brown j soft and easily frangible ; adheres slightly to the tongue •, streak shining ; feels greasy. Chem. Char.—When placed on burning coals it gives out a pale flame with a sulphureous odour, becomes white, and loses a good deal of its weight. Localities, Sec.—This mineral is peculiar to coal countries, which it always accompanies, and alternates With MINE R A L O G Y. rt I. ssifica- with slaty clay and coal. It is not unfrequent in Bohe- kion. mia, Poland, England, and Scotland. 12. Species. Drawing Slate. Black Chalk, Kirwan, i. 195. Le Schiste a Dcssincr, Broch. i. 391. Argile Schisieuse Graphique, Hauy, iv. 447. Extcr. Char.—This mineral is found massive, usually dull 5 but in the direction of the principal fracture a little glimmering j fracture in certain directions curved slaty; in others fine grained earthy j fragments splin¬ tery or tabular. Colour grayish or bluish black; opaque ; stains black; soft ; meagre to the feel. Chem. Char.—Before the blow-pipe it becomes co¬ vered with a kind of varnish. Constituent Parts. Wiegleb. Silica, 64.50 Alumina, 11'25 Carbone, 11 Oxide of iron, 2.75 Water, 7.50 Loss, 3 100.00 Localities, &c.—Drawing slate frequently accompa¬ nies aluminous schistus. It forms along with it beds which are subordinate to clay slate. It is found in Ita¬ ly, where it is an object of commerce. It is also found in Spain, France, and some parts of Scotland. Uses.—As its name indicates, it is employed like black chalk in drawing. 13. Species. Whet Slate. Novaculite, Kirw. i. 238. Le Schiste a Aiguiser, Bro- chant, i. 393. Argile Schisteuse Novaculaire, Hauy, iv. 448. Exter. Char.—This mineral is found massive ; is scarcely glimmering ; fracture in large masses slaty, in small pieces splintery ; fragments tabular. Colour commonly greenish gray, or smoke gray. Sometimes mountain green : translucent at the edges : semihard, but varying between hard and soft; rather easily frangible; streak grayish white ; feels greasy; does not adhere to the tongue. Specific gravity 2.722. Chem. Char.—Does not effervesce with acids, and is infusible before the blow-pipe. Localities, &c.—Whet slate is found in primitive mountains, where it forms beds which are subordinate to clay slate. It was originally brought from the Le¬ vant ; but has since been discovered in Bohemia, Saxo¬ ny, in Bayreuth, where it is wrought, and in Siberia. An efflorescence has been observed on the surface, which is found to be sulphate of magnesia ; from which at is naturally supposed that the base of that salt forms one of its constituent parts. Uses.—Whet slate, as its name imports, is cut and polished for the purpose of sharpening knives and other Vol. XIV. Part r. f instruments; and, reduced to powder, is employed in Argillacc- polishing steel. ous genus. 14. Species. Clay Slate. Argillite, or Argillaceous Schistus, or Slate, Kirwan, i. 234. L.e Schiste Argilleux, Brochant, i. 395. Ar¬ gile Schisteuse Tegulaire, Hauy, iv. 447. Extcr. Char.—Clay slate is found massive, or disse¬ minated, or in rounded pieces ; internally it is a little shining or glimmering ; rarely dull ; the more the struc¬ ture fs foliated, the greater is its lustre. Lustre some¬ times silky, pearly, or semiinetallic. Fracture more or less slaty, sometimes curved and waved, sometimes ear¬ thy or splintery ; fragments tabular, rarely splintery ; sometimes cubic or rhomboidal. Colour chiefly gray of various shades ; but sometimes it is reddish, brownish, or yellowish, or reddish brown. Different colours are so disposed as to appear striped, waved, spotted, or dendritic. It is in general soft; sometimes semihard, sectile, and easily frangible. Gives a grayish white streak ; feels greasy. Spec. grav. 2.6'" to 2.88. According to Kirwan, clay slate is composed of silica, alumina, lime, magnesia, and iron, with some bitumi¬ nous particles. Localities, &c.—Clay slate belongs equally to the primitive, transition, and stratiform rocks, and frequent¬ ly forms entire mountains. Primitive clay slate is some¬ times mixed with quartz, mica, hornblende, garnets, limestone, pyrites, cinnabar as at Idria; in general it abounds with metallic ores, either in veins or in beds. Clay slate is very abundant in most countries; it is not uufrequent in many parts of Scotland ; but the slate of Easdale, and the contiguous islands on the west coast, has long maintained a decided superiority and preference to all others in this coun¬ try. Uses.—Clay slate is in extensive use for covering- houses, and then it is known in this country by the single word slate. It is also employed in large plates for writing on, or tracing characters that are afterwards to be effaced. 15. Species. Lepidolite. Id. Kirwan, i. 208. Id. Hauy, iv. 375. La Lepido- lithe, Brochant, i. 399. Exter. Char.—Lepidolite is found massive, and disse¬ minated in small plates, which might be taken for mi¬ ca. It is usually glimmering, rarely shityng. Lustre semimetallic. Fracture fine grained uneven, rarely fo¬ liated. Fragments blunt edged. Colour lilac blue, grayish and reddish brown ; trans¬ lucent. Semihard; sometimes soft; easily frangible; and feels meagre. It is easily scraped with the knife; but is with difficulty reduced to powder by trituration. The powder rubbed between the fingers has a greasv feel. Spec. grav. 2.816 to 2.854. Chem. Char.—Froths up under the blow-pipe, and melts into a transparent colourless globule ; but writh the addition of a little nitre it becomes vio¬ let. A a Constituent 186 Argillace¬ ous genus. Constituent Parts. Klaproth. 54*5 38*25 4* Silica, Alumina, Potash, Fluate of lime, Oxide of iron and manganese, .75 "Water and loss, 2.5 100.00 Localities, &c.—This mineral was first discovered in the mountain Gradisko near Rosena in Moravia, where it is found in considerable masses included in blocks of granite. It is found also in Sweden. Sometimes it is disseminated in quartz rock. The name, from terns, “ a scale,” is derived from its scaly structure. Lepidolite was at first taken for fiuate of lime or zeolite. A red coloured variety of sehorlite was also supposed to be crystallized lepidolite. 16. Species. Mica. Id. Kirw. i. 21. Id. Broch, i. 402. Id. Hauy, iii. 208. Exter. Char.—Mica is most commonly disseminated in thin tables, rarely massive or crystallized. The pri¬ mitive form of its crystals is a rectangular prism, whose bases are rhombs with angles of 120° and 60 the integrant molecule is the same. The usual forms of its crystals are, a six-sided table with equal angles, sometimes very thick, which produces a six-sided prism, and the want of two of the faces produces the table with four rhomboidal faces j but the most common form of mica is in thin plates or scales of no determi¬ nate figure. The lateral faces of the basis of the ta¬ llies are smooth and resplendent *, lustre metallic ; frac¬ ture foliated, sometimes curved or waved, and sometimes radiated 5 fragments in the form of plates. Colour usually gray, ash, yellowish, greenish, and blackish gray 5 in thin plates semitransparent, or even transparent 5 otherwise, only translucent on the edges*, semihard, very easily frangible j flexible and elastic. Spec. grav. 2.79 to 2.93. Physical Char.—Mica rubbed on Spanish wax com¬ municates to it negative electricity. Chem. Char.—Before the blow-pipe it is with dif¬ ficulty fusible into a whitish gray or green enamel. Black mica yields a black enamel, which is attracted by the magnet. MINERALOGY. Part Localities, See.—Mica is one of the most common Classify minerals, forming one of the constituent parts of gra- tion. nite, gneis, micaceous sclnstus, and other pi inntive locks, . and in some of them sometimes forms particular small veins. Mica also enters into the composition of strati¬ form rocks, as green stone, basalt, wacken. Cat gold and cat silver are varieties of mica of a gold or silver colour, which have a considerable lustre, but inferior to that of these metals. It may be easily di¬ stinguished by the streak, which in the mica affoids a whitish powder without any lustre. Uses.—When mica is obtained in large and thin plates, it is employed as a substitute lor glass, and for this purpose it has been used for windows of men of war, as on account of its elasticity it is less subject to be broken from the concussion produced by the firing of cannon. too Silica, Alumina, Lime, Magnesia, Oxide of iron, Loss, Constituent Parts. Bergman. Muscovy Glass. 40 45 Vauquelin. 50. 35* i*33 i*35 7* 5*32 100.00 JOO 17. Species. Finite. Micarelle, Kirw. i. 212. La Finite, Broch. i. 456. Exter. Char.—This mineral has been usually found crystallized in six-sided prisms, having all the lateral edges truncated, or only three alternating edges, or in four-sided rhomboidal prisms, xhe sen faces of the cry¬ stals smooth and a little glimmering 5 internally it is dull, sometimes a little shining in the cross fracture 5 the fracture is fine grained, uneven, or small conchoidal) fragments blunt-edged. Colour reddish or blackish brown $ opaque 5 the brown variety is slightly transparent 5 so soft as to be cut with a knife, when it becomes of a bluish black *, powder bright grav 5 adheres a little to the tongue j feels greasy ; sp. grav. 2.98. Constituent Parts. Klaproth.. Alumina, Silica, Oxide of iron, 63-75 29.50 6*75 100.00 Kirwan. Colourless Mica. 38 28 20 J4 100 Localities, Sec.—Finite is found only near Schnee- berg in Saxony, in the mine called Pim ; hence its name. It is accompanied by quartz, feldspar and mica, which constitute a small grained granite. 18. Species. Fotstone. Id. Kirw. i. 155. La Pierre Ollaire, Broch. i. 405. Talc Ollaire, Hauy, iii. 257. Exter. Char.—Potstone is found'massive j internally it is dull, sometimes glimmering or a little shining, pearly -, fracture curved slaty, rarely foliated or wa¬ ved ; fragments blunt edged, in the form of tables or scales. Colour greenish gray, sometimes reddish or yellow¬ ish j opaque, rarely translucent on the edges y soft, sec- tile, and mild -, feels greasy y by being breathed upon it emits the argillaceous smell. Spec. grav. 2.76 to 2.86. Chem. Char.—Infusible before the blow-pipe y some varieties absorb a little water. Constituent Constituent Pai'ts. Silica, Magnesia, Alumina, Lime, Oxide of iron, Fluoric acid ? Loss, MINER Wiegleb. 3S.12 38-54 6.66 .41 I5.Q2 .41 .84 100.00 Localities, &e.—Potstone is found at Cliiayenna, in the Valteline, from which the specimen above analyzed was obtained ; at Como, in Switzerland, hence called Como stone. It is also found in Saxony, Hungary, and on the banks of Loch Fine opposite to Inverary in Scot¬ land. Potstone forms entire beds, and is usually ac¬ companied by serpentine, or it is in nests ; it is rarely pure, but mixed with chlorite, talc, asbestus, &c. Vses.—On account of the refractory nature of this stone, it is employed in the construction of furnaces where great heat is required $ and as it may be cut or turned on the lathe, it has been formed into utensils for the kitchen, and hence the name, potstone. 19. Species. Chlorite. Id. Kirw. i. 147. La Chlorite, Broch. i. 408. Talc Chlorite, Hauy, iii. 257. Chlorite is divided into four subspecies : 1. earthy j 2. common 5 3. foliated j 4. schistose or slaty. Subspecies 1. Earthy Chlorite. Exter. Char.—This mineral is composed of small, scaly, thin, and slightly glimmering particles, cohering together, rarely in the form of powder. Colour intermediate between mountain green and dark leek green ; sometimes brownish ; does not stain; feels greasy, but does not adhere to the tongue; gives an earthy smell by breathing on it. Chem. Char.—-Melts before the blow-pipe into a gray or black enamel. Constituent Parts. Vauquelin. Silica, 26. Alumina, 18.50 Magnesia, 8. Muriate of soda, 2. Oxide of iron, 43. Water, 2. .Loss, .50 100.00 Localities, &c.—Earthy chlorite is always found in primitive mountains, forming beds which are subordi¬ nate to clay slate. It is found in Saxony, Switzerland, Savoy, and in Scotland. Subspecies 2. Common Chlorite. Exter. Char.—This is found massive and disseminated, or in thin superficial layers on other stones j internal lustre slightly glimmering, resinous ; fracture earthy, or A L O G Y. 187 foliated j fragments blunt-edged j soft, sometimes semi- Argillace- hard. ous genus. Colour similar to the former, and sometimes gravish white j is opaque, easily frangible ; gives a light green streak without lustre. Constituent Parts. Hoepfner. Silica, 41 Magnesia, 39 Alumina, 6 Lime, 1 Oxide of iron, 10 Loss, 3 100 Localities, &c.—Common chlorite is found in tint same places with the former, and indeed it is supposed to be earthy chlorite indurated. At Altenberg in Saxony, it is mixed with pyrites of copper and arsenic, and common hornblende. Subspecies 3. Foliated Chlorite. Exter. Char.—This variety is found massive, dissemi¬ nated, and crystallized in the form of a six-sided table somewhat elongated j several of these tables being uni¬ ted together, frequently form globular, kidney-form, or hotryoidai groups. External lustre glimmering or weakly shining; internal shining, resinous, or pearly ; fracture foliated $ folia curved j cleavage simple 5 frag¬ ments in tables. Colour intermediate between leek and dark green j opaque, or translucent at the edges ; streak light green 5 is soft, sectile, easily frangible, and feels a little greasy. Constituent Parts. Lampadius. Silica, . 35. Magnesia, 29.9 Alumina, 18. Oxide of iron, 9.7 Water, 2.7 Loss, 4.7 100.0 Localities, &C,-—This mineral has been only found on St Gothard in Switzerland; it lines the sides of a vein which traverses micaceous schistus. It is accom¬ panied by crystals of green mica, adularia, and quartz. Brochant suggests that foliated chlorite may perhaps be nothing else than a crystallized mica. Subspecies 4. Schistose Chlorite. Exter. Char.—This variety is found massive j inter- pal lustre weakly shining, sometimes shining, resinous $ fracture curved slaty, sometimes waved, or a little splintery; fragments tabular, Colour green j is soft, sectile, and easily frangible $ streak light green } feels a little greasy j gives the earthy smell by breathing. Localities, &c._—Slaty chlorite is found in Norway, Sweden, Switzerland, in different parts of Scotland, as on the banks of Loch Lomond, and in the islands of A a 2 Bute MINE li illace- Bute and Arran. Sometimes it forms very extensive genus, beds in mountains of clay slate, to which it is subordi- nate j and it is frequently accompanied by garnets and magnetic iron, crystallized in octahedrons. The name is derived from the Greek word which signifies green. 20. Species. Hornblende. This is divided into four subspecies*, I. common 5 2. basaltic ; 3.1abradore ; and, 4. schistose. Subspecies 1. Common Hornblende. .Hornblende, Kirw. i. 163' Hornblende Commune, Broch. i. 415. Amphibole, Hauy, iii. 58. Exter. Char.—Hornblende is found massive or disse¬ minated, and sometimes crystallized. The forms are a four-sided prism, of which the acute opposite lateral edges are strongly truncated j a six-sided prism with four broad and two narrow faces, slightly truncated on the lateral edges 5 a similar six-sided prism, shorthand having the extremities bevelled 5 an eight-sided prism, having at its extremities, a convex bevelment. _ Some- times the crystals are acicular and in groups *, internal lustre shining, vitreous, or pearly ; fracture foliated,^ sometimes radiated, and sometimes fibrous j surlace or the fracture longitudinally streaked ; fragments sharp- edged, sometimes rhomboidal. Colour deep black, greenish black, or greenish gray *, usually opaque. The green varieties translucent at the edges. Soft or semihard j not easily frangible ; streak greenish gray* j gives an earthy smell by breathing on it: sp. grav. 3.6 to 3-88. Chan. Char.—Before the blow-pipe it melts easily into a grayish black glass. Constituent Parts. Kirwan. Hermann. Silica, 37 37 Alumina, 22 27 Magnesia, 16 3 .Lime, 2 5 Oxide of iron, 23 25 Loss, 3 100 100 Localities, See.—Hornblende is one of the constitu ent parts of primitive rocks, as in sienite; and it seems also to be an accidental substance, as in gneiss, primi¬ tive limestone, porphyries, and micaceous schistus. It is found also in masses or entire beds, as in Saxony ; and is very common in most countries, as in Norway, Hungary, and Britain. Uses.—Sometimes employed as a flux for ores of iron. Subspecies 2. Basaltic Hornblende. Basal tine, Kirw. i. 219. Hornblende Basal tique, Iloeli. i. 424. Exter. Char.—This mineral is most frequently found crystallized in equal six-sided prisms, variously modified or with equal sides *, having two narrow and four broad ; or four narrow and two broad 5 or three broad and three narrow alternately. The crystals are imbedded, insulated, or grouped. Surface smooth, shining •, in¬ ternal lustre resplendent, in the cross fracture weakly A L O G Y. _ part shining, vitreous*, fracture foliated*, cross fracture Clarsifk small grained, uneven, or concboidal. Fragments near-1 ly rhomboidal. Colour velvet black, and sometimes with a shade of green *, opaque 5 streak grayish white ; semihard j earthy smell by expiration. Spec. grav. 3.22 to 3.33. Chan. Char.—Before the blow-pipe melts less easily than the preceding, into a black glass. Constituent Parts. Bergman. Silica, 58 Alumina, 27 Lime, 4 Magnesia, 1 Oxide of iron, 9 Loss, 1 ICO Localities, &c.—This mineral, as its name imports, is usually found in basalt. It is also met with in wacken, and in the lava of Vesuvius, it is not un¬ common in the basaltic rocks ol Silesia, Saxony, and Bohemia, as well as in those of this country. As it is less liable to decomposition than the rocks which con¬ tain it, detached crystals are frequently found among decayed basalt. Subspecies 3. Labradore Hornblende. La Hornblende du Labrador, Broch. i. 419. Exter. Char.—This mineral is found massive, disse¬ minated, in rounded pieces, and very rarely crystallized in four-sided rectangular prisms. Internal lustre shin¬ ing, somewhat metallic j fracture toliated, sometimes curved. Colour blackish green, or greenish black j sometimes bronze yellow j scarcely translucent at the edges j se¬ mihard j not difficultly frangible j streak greenish. Spec. grav. 3.38. Localities, &c.—This mineral is found in the island of St Paul on the Labradore coast, but nothing is known of the nature of its repository. Subspecies 4. Schistose Hornblende. Id. Kirw. i. 222. La Hornblende Schisteuse, Broch. i. 428. Exter. Char.—This variety is found massive; inter¬ nal lustre weakly shining ; fracture in masses slaty ; in small pieces radiated, sometimes fibrous ; fragments in plates. Colour greenish, or grayish black; opaque *, semi¬ hard ; streak greenish gray ; rather difficultly fran¬ gible ; breathed on, gives the earthy smell. Localities, &c.—Schistose hornblende forms exten¬ sive beds in primitive mountains, to which it is subordi¬ nate. It seems to be common hornblende more or less mixed with quartz. It is found in Bohemia, Norway, Sweden, in the isle of Skye, and other places of Scot¬ land. 21. Species. Basalt. Figurate Trap, Trap, Whinstone, &c. Kirw. 1. 2.25* —233. Le Basalte, Broch. i. 430. La Lithbide Prismatique, Hauy, iv. 474. Exter. rtl, MINERALOGY. i8g ssifica- Exter. C/icr.—-Basalt forms entire monntains, in the ion. neighbourhood of which it is found in rounded pieces, -v—; or in large globular masses; internally it is dull; some¬ times glimmering from a mixture of hornblende ; frac¬ ture uneven, sometimes fine splintery or conchoidal ; fragments not very sharp-edged. It is most frequently in distinct concretions, which are prismatic or columnar, more or less regular; sometimes also in globular distinct concretions. Colour grayish or bluish black, sometimes brownish on the surface ; opaque ; semihard ; brittle, and very difficultly frangible ; streak light ash gray; gives a ringing sound under the hammer. Spec. grav. 2.86 to 3. Chcm. Char.—Melts very easily before the blow¬ pipe into an opaque black glass which acts on the magnet. Physical Char.—Many basalts affect the magnetic needle, reversing the poles when it is brought near them. This is ascribed to the great proportion of iron which enters into their composition. Localities, &c. Basalt is not uncommon in every part of the globe, and in many places it is very abun¬ dant. It is found in regular columns in several of the Hebrides on the west coast of Scotland, as in Cannay, Eigg, the Schant isles, but particularly beautiful in Staf- fa. Pretty regular columns are observed also at Dunbar, and on the south-wrest side of Arthur’s seat near Edin¬ burgh ; but the Giant’s causeway and the rocks about Fairhead on the north coast of Ireland, exhibit the finest and most extensive ranges of columnar basalt in the world. Basalt, besides being in the columnar form, is of¬ ten disposed in beds and veins; both of which are very common in different places in Scotland, particularly on the western coast, and in the western islands. See Dr Millar’s edition of Williams's Mineral Kingdom. No subject, in geological speculation, has produced more controversial discussion than the origin of basalt; one party asserting that it is the effect of fusion, while another contends that it must have been deposited from an aqueous solution. Our limits preclude us even from barely stating the arguments which have been proposed by naturalists in support of the theories which different parties have embraced. For an account of some of them, see Geology Index; and for the constituent parts of basalt, and some other facts connected with its natural history, see Basalt. Uses.—Basalt is sometimes employed as a touchstone, as a flux for ores of iron, and in the manufacture of common bottles. It is also employed for millstones. The ancients employed it in sculpture, for it would ap¬ pear that some of their vases and statues were formed of it. 22. Species. Wacken. Id. Kirw. i. 223. La Wahke, Broch. i. 434- Exter. Char.—Wacken is found massive ; it is fre¬ quently vesicular, and the cavities are often filled with other minerals; internal appearance dull; fracture even or earthy; fragments rather blunt-edged. Colour grayish green, grayish black, reddish, or brownish ; opaque ; streak a little shining ; soft or se¬ mihard ; easily frangible; feels a little greasy. Spec. Argillace- grav. 2.35 to”2.89. yas genus. Chan. Char.— Fusible like basalt. Vj"“"v J Localities, &c.—Wacken belongs to the stratiform rocks. It contains sometimes petrified wood, and the bones of animals. It constitutes beds sometimes in the middle of basalt, but is oftener in the form of veins, and is the basis of amygdaloid, the cavities of wdiich are filled with green edrth, calcareous spar, &c. Wack¬ en is met with in Saxony, Bohemia, Sweden, and many places of Scotland. 23. Species. Phonolite, or Clinkstone. Id. Daubuisson, Jour, de Phys. lx. 74. La Pierre Son- nante, Broch. i. 437. Klingstein and Porphyrschic- fer of the Germans. Exter. Char.—This mineral is always found massive; internal lustre glimmering ; fracture slaty, sometimes uneven or conchoidal; fragments sharp-edged ; compo¬ sed of distinct concretions, which are either in the form of tables, or are columnar, and somewhat regularly grouped together. Colour gray, ash, greenish, or bluish gray; the co¬ lours sometimes have a dendritical appearance; opaque, or translucent at the edges ; semihard, or hard ; not difficultly frangible ; in thin plates it emits a sound when struck with a hammer, and hence its name. Spec. grav. 2.575. # . Chan. Char.—Melts before the blow-pipe into a co¬ lourless glass. Constituent Parts. Klaproth. Bergman. Silica, 57-25 58- Alumina, 23.5 24.5 Lime, 2.75 3-5 Oxide of iron, 3.25 4.5 manganese, .25 — Soda, ~ 8.1 6. Water, 3- 2- Loss, *-9 I-5 100.00 100.o The stone analyzed above by Bergman, was from Puy in Velay, in France, and is considered by Dolo- mieu as volcanic. The other by Klaproth, is from Bohemia. Excepting the small proportion of manga¬ nese detected in the latter, the coincidence of the two analyses is very striking. Tnrnlities &c.—Phonolite is not uncommon in many parts of the’world. It is met with in Scotland, in the island of Lamlasb near Arran ; and it constitutes the greater part of Traprene Law in East Lothian ; in both places it is columnar. 24. Species. Lava. Id. Kirw. i. 400. La Lave, Broch. i. 440. La Scon- jiee, Hauy, iv. 497. Exter. CAar.—This mineral is generally of a porous texture, with cavities of different sizes; lustre glimmer- mineralogy. ing or a little sinning, vitreous j fracture imperfectly coRchoidal; fragments not very sharpredged. Colour blackish gray, perfect black, or brownish black, sometimes greenish, and rarely white.j opague} semihard j brittle"; not difficultly frangible; light. Chem. Char.—Lava is very fusible, and yields a com¬ pact black glass. Constituent Parts. Bergman. Silica, 49 Alumina, 35 Lime, 4 Oxide-of iron, 12 lOO Localities, &c.—Lava being a volcanic product, is only found in the vicinity of volcanoes. t/ses.—Lavas are employed for the purposes of build¬ ing ; their lightness, arising from the numerous cavities, renders them proper for the construction of vaults. 25. Species. Green Earth. Id. Kirw. i. 196. La Terre Verte, Epoch ant, i. 445* Talc Chlorite Zographiqms,,Hauy, iii. 257. Exter. Char.—-Green earth is found massive, or dis¬ seminated, or in superficial crusts on balls of agate; internally it is dull; fracture earthy; fragments blunt- edged. Colour celadon green, or blackish green ; opaque; soft; feels slightly greasy; adheres a little to the tongue; streaks weakly shining. Chem. Char.—Before the blow-pipe it becomes black, but is infusible. It is not acted on by acids, and ab¬ sorbs water. Constituent Parts. Klaproth. Silica, 53. Alumina, 12. Lime, ✓ . 2.5 Magnesia, 3*5 Oxide of iron, 17* Water, 12. Loss, 1. , 100.00 Localities, &c.—Green earth is found at Verona, where it is wrought, and constitutes an article of com¬ merce ; and it is met with in all amygdaloid rocks. Uses.—Green earth is employed as a colouring mat¬ ter in painting. 26. Species. Lithomarga. Id. Kirw. i. 187. La Moelle de Pierre, Brochant, i. 447. Argile Lithomarge, Hauy, iv. 444. This is divided into two subspecies, chiefly distin¬ guished by their cohesion. These are, 1. friable j 2. indurated. Subspecies 1. Friable ' Lithomarga. Exter. CAar.—This is found massive or disseminat¬ ed; is slightly glimmering ; adheres strongly to . the tongue) feels greasy. Colour yellowish white, snow' white, sometimes red¬ dish the particles have very little cohesion. Subspecies 2. Indurated Lithomarca. Exter. Char.—This is also found massive or disse¬ minated; is dull; has a fine grained earthy fracture, sometimes conchoidal ; blunt-edged. Colour white, yellowish, or reddish white ; brownish red, and several shades of yellow. Different colours are disposed in spots, veins, dots, stripes; or clouds ; opaque ; very soft ; streak shining; adheres to tire tongue; feels greasy. Chem. Char.—Infusible before the blowr-pipe ; falls to pieces in water without forming a paste. Accord¬ ing to some analyses, it contains a large proportion of magnesia. Physical Char.—Some varieties when rubbed with .a feather in the dark, give a little light. Localities, &e.—Lithomarga or stone marrow, de¬ rives its name from its being found in nodules in amyg¬ daloid rocks ; it occupies veins or small fissures in por¬ phyry, gneis, and serpentine. It is found in Bohemia, Saxony, France, England, and at the Giant’s causeway in Ireland. A variety of lithomarga, which exhibits many fine colours, particularly violet or lavender blue, is found in beds reposing on coal at Planitz, near Zivickau in Saxony. It has been called, from its beautiful appearance, wonder earth of Saxony (Terra miraculosa). 27. Species. Mountain or Bock Soap. Le Savon de Montague, Brocbant, i. 453. Exter. Char.—This mineral is found massive; is dull internally ; has an earthy, and sometimes an imper¬ fectly conchoidal fracture ; fragments blunt-edged. Colour brownish black, spotted ochrey yellow. O- paque; very soft; easily frangible ; streak shining, and resinous ; stains and writes on paper; feels greasy, and adheres strongly to the tongue. Localities, &c.—This mineral is rare ; has been found at Olkutsch in Poland, and also, it is said, in England. 28. Species. Umber. Exter. Char.—This mineral is found massive ; frac¬ ture conchoidal; fragments blunt-tedged. Colour brownish, of various shades ; soft; adheres a little to the tongue, and has a meagre feel. Localities, &c.—Umber is found disposed in beds, in the island of Cyprus ; and it is employed as a pig¬ ment. 29. Species. Yellow Earth. Id. Kirw. i. 194. La Terre Jow«e, Broch. i. 455. Exter. Char.—Yellow earth is found massive; itis dull, or in the principal fracture, which is slaty, glim¬ mering ; cross fracture earthy; fragments very blunt- edged. Colour ochrey yellow; very soft; streak shining; feels greasy, and adheres a little to the tongue. Localities, &c.—It has only been found in small beds in, stratified mountains, at Wehraw in Upper Lu- satia, rt I. MINER iSgifica. satxa, and it is said, in the cavities of gray wacken, and rion. in the fissures of a sandstone rock. •'V—,J Uses.—It is employed in the arts as a pigment. V. MAGNESIAN Genus, i. Species. Native Magnesia. Magnesie Native, Brochant, ii. 449. Extcr. Char.—Native magnesia is found massive, tu¬ berous or carious. Surface uneven and dull. Fracture flat, conchoidal, splintery or earthy. Fragments sharp- edged. Colour yellowish gray, with spots and dendritic deli¬ neations of black or blackish brown. Opaque, soft and easily frangible. Feels greasy; adheres to the tongue, and is rather light. Constituent Parts. A L O G Y. 191 Colour yellowish brown or reddish, with spots and Magnesian dendritical figures of black ; opaque, rarely translucent genus, at the edges ; very soft; easily frangible 3 adheres to the tongue; feels greasy 3 streak shining : sp. grav. 1.4 to 2. Chan. Char.—Before the blow-pipe it becomes black or gray, and melts into a greenish gray slag. Falls to pieces in water with a crackling noise, and without forming a paste. Constituent Parts. Bergman. Silica, Alumina, Magnesia, Lime, Oxide of iron, Water, 47* 19. 6.2 5-4 54 I7- 100.0 Carbonic acid, 51. Magnesia, 474 A trace of iron, Loss, i4>- 100.0 Localities, Sec.—This mineral was discovered by Dr Mitchell in a serpentine rock at Roubschitz in Mora- via. Ihur.de A mineral in many respects similar to this has |h. Is. been analyzed by Giobert*. It was long known un¬ der the name of porcelain earth, and was successfully employed in that manufacture. Giobert supposes that the external characters, and particularly the colours, of the mineral found in Moravia, seem to indicate the ex¬ istence of other substances beside those detected by Dr Mitchell’s analysis. Exter. Char.—The mineral described by Giobert is found massive or in mammillary fragments, some of which are tuberculated. Surface dull. Fracture con¬ choidal or uneven. Colour pure white. Opaque. Spec. grav.. variable. Hard, sometimes soft. Feels greasy ; adheres slightly to the tongue. The softer varieties absorb water greedi¬ ly and with a hissing noise. Chem. Char.—Infusible before the blow pipe. Constituent Parts. Magnesia, 68; Carbonic acid, 12. Silica, 15-6 Sulphate of lime, 1.6 Water, 3* 100.2 Localities, &c.—This mineral is found at BaudiSsero, in a vein which traverses a steatitic rock of which the mountain is composed. 2. Species. Bole. Id. Kirw. i. 190. Le Bol, Broch. i. 459. Argile Ochi'eusc, Hauy, 445. Exter. Char.—Found massive and disseminated 3 surface dull, sometimes a little glimmering 3 fracture conchoidal 3 fragments sharp-edged. 2 Localities, &c.—The chief places which yield bole are tire island of Lemnos, hence called Lemnian earth ; Sienna in Italy, and Strigau in Silesia, in which latter place it is deposited on indurated clay 3 in Upper Lu- satia it forms nests in basalt. Uses.—Bole and similar earths were formerly em¬ ployed in medicine 3 it is now only used in the prepara¬ tion of colours. ClMOLXTE. This is a mineral which in many of its characters is closely connected with the preceding. Exter. Char.—It is found massive 3 fracture earthy uneven, or slaty 3 colour grayish white, pearl gray, and exposed for some time to the air, reddish 3 opaque 3 does not stain 3 adheres strongly to the tongue 3 is soft, and difficultly frangible : sp. grav. 2. Chem. Char.—Before the blow-pipe it becomes at first of a deep gray colour, but afterwards white. Constituent Parts. Klaproth. Silica, 63. Alumina^ 23. Oxide of iron, 1.25 Water, 12. Loss, .73 100.00 Localities, Sec.—This mineral was brought by Mr Hawkins from the island of Argentiers, formerly Ci- molo, from whence it has its name. Olivier found a similar substance in the island of Milo, but which was very friable. Uses.—This substance is employed in whitening woollen stuffs. It is described by Pliny under the name Cimolia, as being applied to the same purpose, and also as a medicine in his time. It is to be observed that cimolite contains, according to the above analysis, no magnesia. 3. Species. Sea Froth. Keffekill, Kirw. i. 144. VEcume de Mer, Brcch. i. 462. Argile glaisc, Hauy, iv. 433. Meerschaum of the Germans. . ■ ' Exter* 192 Magnesian genus. MINERALOGY. Part Extcr. Char.— ’This mineral is found massive, disse¬ minated, or in superficial layers. Surface dull. 1 racture fine earthy, sometimes slaty. Fragments sharp edged. Colour yellowish white. Opaque. \ery soft. Easily frangible. Streak shining. 1 eels greasy 5 and adheres to the tongue. Sp. gr. 1.6. Chem. Char.—Infusible before the blow-pipe. Constituent Parts. Klaproth. Silica, Magnesia, Lime, Water, Carbonic acid, Loss, 50-5 I7,25 •5 1:} '-IS 41. 18.25 •5 39- 1.25 Enter. Char.—Steatites is found massive, dissemina- classicJ ted, and crystallized. Forms of the crystals, a six-sided tion. | prism terminated by a six-sided pyramid } a rectangular and rhomboidal four-sided prism; and a double six-sided pyramid. The crystals are small, generally imbedded in the massive variety ; but they are very rare ; and it is supposed, with some probability, that they are pseudo¬ crystals. Surface of the crystals smooth and shining. Internally dull; fracture coarse splintery, rarely earthy or slaty. Fragments blunt-edged. Colour greenish, yellowish, reddish or grayish. Co¬ lours sometimes mixed, and spotted or dendritical. Translucent at the edges. Soft, sometimes friable. Streak shining. Feels greasy. Sp. gr. 2.614. Chem. Char.—Infusible before the blow-pipe ; hut becomes white and very hard. 100.00 100.00 Localities, &c.—Sea froth is found in Natolia, in the Crimea, in Spain and some other places. It appears to be distributed in hnv grounds in thin beds ; and it is said to be in the state of soft paste which hardens in the air. Uses.—It is employed in Turkey, in the manufacture of the heads of tobacco pipes ; and as a detersive sub¬ stance, like fullers earth, by the Tartars. 4. Species. Fullers Earth. Id. Kirw. i. 184. La Terre a Toulon, Broch. i. 464. Argile Smectique, Hauy, iv. 443. Extcr. Char.—Found massive. Surface dull. Frac¬ ture fine grained earthy, conchoidal or slaty. Frag¬ ments blunt edged. Colour olive green, yellowish or reddish. Colours sometimes mixed and disposed in spots or stripes; opake; soft or friable. Streak somewhat shining. Sometimes adheres to the tongue ; feels greasy, Chem. Char.—Does not effervesce with acids ; melts into a brown spongy clay ; falls to pieces in water with¬ out forming a paste, and does not froth up like soap. Constituent Parts. Bergman. Silica, Alumina, 25. Lime, _ 3.3 Magnesia, .7 Oxide of iron, 3.7 Water, 15.5 Constituent Parts. From Cornwall. Silica, 48. Magnesia, 20.5 Alumina, 14. Oxide of iron, 1. Water, 15.5 Loss, 1. Klaproth. From Bayreuth. 59-5 3°'5 2-5 5-5 2. 100,0 100.0 Localities, &c.—Steatites is found in primitive moun¬ tains, forming beds and veins in serpentine rocks ; some¬ times in metallic veins, as in the tin mines near Frey- berg. It is also imbedded in wacken, as in the island of Skye, and in veins of serpentine at Portsoy in Scot¬ land. Steatites is also found in Cornwall in England, and in Sweden, Norway, Saxony, and France. Uses.—Steatites is sometimes employed in the manu¬ facture of porcelain, and some varieties of it answer for the same purpose as fullers earth. 6. Species. Figure Stone. La Pierre a Sculpture, Broch. i. 451. LePildstein of the Germans. E.vter. Char.—This mineral is found massive. Inter¬ nal lustre sometimes glimmering, sometimes dull, greasy. Fracture slaty ; cross fracture splintery. Colour olive green, greenish gray, yellowish brown, sometimes reddish, and veined. Semitransparent, or translucent at the edges, and sometimes opake. Soft; sectile ; feels greasy. Sp. gr. 2.78 to 2.81. 100.00 Localities, &c.—Fullers earth is found in Sweden, Saxony, and France, forming beds ; but the best fullers earth is found between strata of sandstone in Hampshire and some other places of England. Uses.—Fullers earth is of great importance in woollen manufactures, on account of its detersive properties. It is extensively employed in the process of fulling or clean¬ sing woollen stuffs from greasy matters. 5. Species. Steatites. La Pierre de Lard, ou Steatite, Broch. i. 474. Semi- indurated and Foliated Steatites, YUivvi.i. 151, and 154. Talc Steatite, Hauy, iii. 256. I Constituent Parts. Klaproth. Translucent, Silica, Alumina, Lime, Oxide of iron, Water, Loss, 54- 36- •75 5-5 3-75 100.00 Opaque Figure Stone. 62. 24. I. 10. 2-5 100.0 Localities, &c.—This mineral is brought from Chi¬ na, and is always cut into various, often singular, figures; and hence the name bildstein, or sculpture stone. 7. Species. it I. MIN sifica- on. 7. Species. NEPHRITE, or Jade. Jade, Kirw. i. 171. Le Nephrite, Broch. i. 467. Hauy, iv. 368. E R A L O G Y. Jade, cutting instruments by the natives of those countries where iron is little known. 8. Species. SERPENTINE. I93 M agnesiau genus. This species is divided into two subspecies. Subspecies 1. Common Nephrite. Exter. Char.—This variety is found massive, disse¬ minated, or in rounded pieces. The surface is smooth, glimmering, and unctuous j internally it is dull 5 frac¬ ture slaty or coarse splintery, rarely fibrous j fragments sharp-edged. Colour leek green, sometimes inclining to blue, green¬ ish or yellowish white ; translucent, sometimes only at the edges j hard j very difficultly frangible $ feels grea- sy. Sp. grav. 2.97 to 4.38. QJiem. Char.—t usible before the blow-pipe, and melts into a semitransparent white glass. Constituent Parts. Silica, Magnesia, Alumina, Lime, Oxide of iron, Hoepfner. IOO Id. Kirw. i. 156. La Serpentine, Brochant, i. 481. Roche Serpentineuse, Hauy, iv. 436. This species is divided into two subspecies. Subspecies 1. Common Serpentine. Exter. Char.—This mineral is found massive, very rarely disseminated ; internal lustre slightly glimmering, or only dull 5 fracture splintery, or fine grained uneven, rarely conchoidal; fragments sharp-edged. Colour blackish green, leek green, grayish, greenish, or bluish gray j in some varieties, red of various shades. These colours are mixed and disposed in spots, stripes, veins, and dots. Translucent at the edges, or opaque j semihard ; not difficultly frangible ; feels greasy. Spec, grav. 2.57 to 2.7. Chetn. Char.—Infusible before the blow-pipe. Constituent Parts. Kir wan. Silica, 4^ Alumina, 18 Magnesia, 22 Oxide of iron, o Water, 12 Localities, &c.—The repository of nephrite is un¬ known. It was originally brought from the Levant, East Indies, and China. It is found also iu the Alps, in Switzerland, and in Piedmont. The water-worn pebbles which are collected on the banks of the lake of Geneva often contain this mineral. It is found also in a similar form at a particular place on the shores of Iona, one of the Hebrides, in Scotland. Uses.—Oriental nephrite, long known under the 1 name of Jade, is held m considerable estimation on ac- | count of its hardness and tenacity. It is employed by the Turks for the handles of knives and sabres, and frequently by others for various ornamental pur¬ poses. The property of curing diseases of the kidneys is as¬ cribed to this mineral by ancient authors, and hence the name nephritic stone, or nephrite. Subspecies 2. Axe Stone. La Pierre de hache, Brochant, i. 470. Beilstein of the Germans. Exter Char.—This is also found massive, but most frequently in rounded pieces j lustre glimmering, or weakly shining ; fracture in large masses, slaty 5 in small, splintery 5 fragments in the form of plates. Colour deep meadow-green, sometimes olive green ; translucent 5 semihard, and sometimes hard 5 not very brittle 5 more difficultly frangible than the preceding variety. Localities, &c.—This mineral is found in China, the East Indies, and South America, on the banks of the river Amazons. It is found also in some of the islands in the South Sea, as well as in Corsica, Switzer¬ land and Saxony. kJscs. Axe stone is employed as hatchets and other Vol. XIV. Part I. f 100 Localities, &c.—Serpentine belongs to the class of primitive rocks, and it constitutes entire mountains. It is found in Saxony, Bohemia, Italy, Corsica, and Siberia 5 in Cornwall in England, where it contains native copper, and at Portsoy in the north of Scotland, where it is known by the name of Portsoy marble. Common serpentine is frequently mixed with steatites, talc, asbestus, garnets, and magnetic iron, but never contains limestone. I his variety, in the language of Werner, is of a newer formation than the following sub¬ species. Uses.—Serpentine is susceptible of a fine polish j on account of which, and its beautiful colours, it is em¬ ployed for various ornamental purposes. Subspecies 2. Precious Serpentine. Exter. Char.—This also is found massive or disse¬ minated ; internal lustre glimmering, rarely weakly shining, resinous j fracture conchoidal, even or splintery j fragments sharp-edged. Colour dark leek green of various shades j trans¬ lucent ; semi-hard ; easily frangible j feels slightly greasy. Localities, &c.—This subspecies is found in similar places with the preceding. It is distinguished from it by being always connected with limestone. The stones known in Italy by the name of verde di Prop verde Antico, verde de Suza, which are very often accompa¬ nied by limestone, may be included under precious ser¬ pentine. 9. Species. Schiller Stone. Schillerspath, or Spath Chatoyant, Brochant, i. 421. Schiller Spat ', Kirw. 221. B b Exter. IJ4- Magnesian genus. MINERALOGY. Part Extcr. C/mr.—This mineral is found disseminated in thin plates, which assume a crystallized form, as in that of a table with six sides,or a short six-sided prism ; lustre shining, sometimes resplendent, and semi-metallic frac¬ ture foliated. ' Colour olive green, bronze yellow, or silvery white j soft} easily frangible j somewhat elastic j feels greasy. Chem. Char.—Before the blow-pipe it melts with borax, into a glass which becomes opaque on cooling. Constituent Parts. Heyer. Silica, 52 Alumina, 23*33 Magnesia, 6 Lime, 7 Oxide of iron, 11.67 100.00 Localities, &c.—Schiller stone is found at Basta in the Hartz, in Moravia, the Tyrol, in Corsica, and in Cornwall. It is usually imbedded in serpentine, and is accompanied by quartz, mica, and copper pyrites. It is supposed by some to be crystallized serpentine. 10. Species. Talc. Localities, &c.—Common talc is always found in ciassifii serpentine rocks, where it accompanies actynohte, stea- tion. tites, and indurated talc. \Y hat is called \ enetian talc r* is brought from the mountains ol Saltzburg and the Tyrol. Uses.—Talc is sometimes employed as a substitute for chalk, enters into the composition of crayons, and is mixed with some kinds of paint. Subspecies 3. INDURATED Talc. Le Talc Endurci, Broch. i. 489. Extcr. Char.—This is found massive, and sometimes, it is said, crystallized j lustre shining and resplendent, resinous or pearly fracture curved foliated, or slaty y fragments blunt-edged, tabular. Colour greenish white, snow white, or apple green j translucent j in thin plates semitransparent j very soft j smooth, and greasy to the feel. Localities, &c.—Indurated talc forms beds in moun¬ tains of argillaceous schistus, gneis, and serpentine, in the Tyrol. Italy, and Switzerland, and also in the wes¬ tern parts of Scotland. Uses.—It is applied to the same purposes as the pre¬ ceding. This species is divided into three subspecies j 1. earthy, 2. common, and 3. indurated talc. Subspecies i. Earthy Talc. Talcite, Kirw. i. 149. Le Talc Tcrrcux, Broch. i. 486. Talc Granukuv, Hauy, iii. 255. Exter. Char.—Earthy talc is found disseminated in kidney-form masses, or in superficial layers j lustre glim¬ mering, pearly •, friable y the particles scaly, pulveru¬ lent, or slightly cohering. Colour greenish, reddish, or silvery white; stains y feels greasy, and is light. Localities, &e.—This mineral is found in Piedmont, Saxony, Bohemia, and in the western parts of Inverness- shire in Scotland, where it exists in veins or cavities of primitive rocks. Subspecies 2. Common Talc. Id. or Venetian Talc, Kirw. i. 150. Le Talc Commun, Broch. i. 487. Talc Luminaire, Hauy, iii. 255. Exter. Char.—This mineral is found massive, dis¬ seminated, and rarely crystallized in very small six-sid¬ ed tables ; lustre shining or resplendent, pearly or me¬ tallic *, fracture straight or curved foliated y fragments wedge-shaped. Colour greenish white, pale apple green, reddish or yellowish white j translucent or semitransparent, in thin plates transparent, soft, flexible, but not elastic y feels greasy. Spec. grav. 2.7 to 2.8. Chem. Char.—Infusible before the blow-pipe, which, distinguishes it from chlorite y does not effervesce with acids. 11. Species. Asbestos. This is divided into four subspecies: 1. mountain cork y 2. amianthus y 3. common ashestus y and, 4. lig- niform asbestus. Subspecies 1. Mountain Cork. Suher Montanum, Kirw. i. 163. Le Liege de Mon¬ tague, Broch. i. 492. Asheste Tresse, Hauy, iii. 247. Exter. Char.—This mineral is found massive, often, in small plates, which are sometimes thin, and are then denominated mineral paper ; sometimes thick, and then called mineral leather ; more rarely in porous or cellular pieces, when they are denominated mineralJlesh ; some¬ times it is marked with impressions y the lustre is weak¬ ly glimmering or dull j fracture to appearance compact and uneven, but it is fibrous, and the fibres are some¬ times parallel, and sometimes interwoven y fragments very blunt-edged. Colour yellowish or grayish white y opaque y very soft, extremely difficult to break y in thin plates flexi¬ ble and elastic y creaks when handled y feels meagre.. Spec. grav. 0.68 to 0.993. Chem. Char.—Melts before the blow-pipe with dif¬ ficulty. Constituent Parts. Bergman. Silica, 56.2 Magnesia,. 26.1 Alumina, 2 Lime, 12.7 Oxide of iron, 3 Constituent Parts. Silica, Magnesia, Alumina, Hoepfner. 50 44 6 500 100.0 Localities, &c.—This mineral is found in thin veins in serpentine rocks : it is often mixed with quartz, talc, and silver ores, as in Saxony. It is also found in Swe¬ den, Norway, Siberia, Hungary, and in the lead veins at Leadhills in Scotland. Subspecies irt I. :;;sifica- MINERALOGY. 195 Subspecies 2. Amianthus. Id. Kirw. i. 161. VAmianthe, Broch. i. 494. Flexible, Ilauy, iii. 247. Asbeste Localities.—Yi is found in similar situations with the Magnesian preceding, in Saxony, Russia, Sweden, and in the west- genus, ern parts of Scotland. ’V~“" Exter. Char.—This variety is also found massive, more rarely disseminated, and in small detached bundles; lustre glimmering, or a little shining and silky ; fracture fibrous straight or parallel. Colour greenish or silvery white, yellowish white, or greenish gray ; opaque ; rarely translucent at the edges ; very flexible, and even elastic in thin fibres; feels greasy. Chern. Char.—Melts with difficulty before the blow¬ pipe, into a white, gray, yellow, and sometimes black enamel. Constituent Parts. Silica, 64 Magnesia, 17.2 Alumina, 2.7 Lime, 13.9 Barytes, Oxide of iron, -2.2 Loss, 100.0 Bergman. Chenevix. 64 59- 18.6 25. 3-3 3* 6.9 9.25 6. 1.2 2.25 r.50 100.0 100.00 Localities, &c.—Amianthus is usually found in pri¬ mitive rocks, but particularly those of serpentine. It is found in Saxony, Bohemia, Italy, Spain, France, Sweden, and in the western parts of Scotland; but the finest specimens of amianthus are brought from the island of Corsica. Uses.—On account of the flexibility of this substance it is spun into threads; for this purpose it is mixed with lint, to render the threads less brittle in working them into cloth, which is afterwards passed through the fire that the vegetable matter may be consumed, and the amianthus, which is infusible, remains ; and thus an incombustible cloth is obtained. The ancients manu¬ factured this cloth for the purpose of wrapping round their dead bodies, that their ashes might be preserved unmixed with the wood employed in burning them. Subspecies 3. Common Asbestos. Asbestus, Kirw. i. 159. L1 Asbeste Commune, Brochant, i. 497. Asbeste T)ur, Hauy, iii. 247. Exter. Char.—This also is fouud massive ; lustre shining and weakly shining, silky or resinous ; surface fibrous, the fibres being parallel, straight, or curved ; the fibres are more strongly united than in amianthus, and hence sometimes a splintery fracture. Colour leek green, greenish, or yellowish gray ; trans¬ lucent at the edges ; soft, or semihard; rather easily frangible ; little flexible ; feels greasy ; spec. grav. 2.54 to 2.99. Chetn. Char.—Melts with difficulty before the blow¬ pipe, into a dark gray slag. Constituent Parts. Wiegleb. Silica, 46.66 Magnesia, 48-45 Oxide of iron, 4-79 Loss, .1 100.00 Subspecies 4. Ligniform Asbestus. Id. Kirw. i. 161. Le Bois de Montague, Brochant i. 499. Asbeste Ligniforme, Hauy, iii. 248. E.rter. C/zar.—This also is found massive ; lustre glimmering, silky ; fracture in large masses, curved slaty; in small pieces fibrous, and having the ap¬ pearance of a woody texture; fragments in elongated plates. Colour yellowish brown of different shades; opaque ; soft; not difficultly frangible ; in thin fragments a little flexible, but not elastic ; feels meagre ; adheres to the tongue ; streak shining. Chan. Char.—Before the blow pipe is only fusible at the edges. Localities, &c.—This variety is found in the Tyrol, where it is accompanied by galena, black blende, and a grayish white quartz. 12. Species. Cyanite. Id. Kirw. i. 209. La Cyanite, Broch. i. 501. Sappare, Sauss. § 1900. Disthene, Hauy, iii. 220. Exter. Char.—This mineral is found massive, disse¬ minated, or crystallized, in four-sided prisms, of which two are broad and two narrow, and having the four la¬ teral edges, or only the two opposite edges, truncated. This prism is often so flattened, as to have the appear¬ ance of a table. The broad faces of the crystals are smooth and shining, the narrow faces streaked and only glimmering, almost dull. Internal lustre shining and pearly; fracture curved radiated ; that of the crystals foliated ; fragments tabular, sometimes splintery, or im¬ perfectly rhomboidal. Colour blue of various shades, sometimes bluish and pearl gray; and different colours are arranged in stripes, spots, or clouds; translucent, or when crystallized se¬ mitransparent, or transparent; semihard, and some ¬ times soft; easily frangible ; feels greasy. Spec. grav. 3.51 to S-62* Chem. Char.—Entirely infusible before the blow-pipe, on which account this mineral was employed by Saussure as a support for other substances in experiments with that instrument. Constituent Parts. Saussurc. Silica, 29.2 Alumina, 55. Lime, 2.25 Magnesia, 2. Oxide of iron, 6.65 Water and loss, 4.9 100.03 Localities, &c.—-Cyanite is found on St Gothard m Switzerland, in crystals mixed with quartz, garnets, and granite, and imbedded in indurated talc. It is also found in Spain, France, Carinthia, Bavaria, Siberia, and in the north of Scotland, and always in primitive, mountains. 13. Species. B b 2 i96 M I N E K Magnesia genus. Species. Actynolite. This is divided into three species j I. asbestous, 2. common, and 3. glassy. Subspecies 1. Asbestous Actynolite. Amianthinite, Kirw. i. 164. and MetaUiform Asbestoul, ibid. 167. La Rayonnante Asbestiforme, Broch. i. 504. Actinote Aciculaire, Hauy, iii. 75. Exter. Char.—This mineral is found massive, and rarely crystallized in rhomboidal six-sided prisms, two of which are about 1240 30', and four about 1170 45^ j lustre glimmering 5 internal lustre weakly shining, some¬ times shining, pearly} fracture radiated 5 fragments wedge-shaped. Colour white, or greenish, reddish, or yellowish gray $ commonly opaque ; sometimes translucent at the edges ; streak greenish white \ soft, rarely semi-hard 5 rather difficultly frangible. Specific gravity 2.58 to 3-33- . . . Chan Char.—Fusible before the blow-pipe into a black slag, or grayish white enamel. Localities, &c.—Found in the neighbourhood of Bayreuth and the Bannat, in beds of serpentine and steatites. Subspecies 2. Common Actynolite. Asbcstinitc, Common, Asbestoid, and Schorlaceons Achjno- lite, Kirw. i. 165—168. La Rayonnante Commune, Broch. i. 507. Actinote Hexaedre, Hauy. iii. 74. Exter. Char.—Massive, disseminated, crystallized in elongated, very oblique, six-sided prisms, having the acute lateral edges truncated. The crystals are acicu- lar, and longitudinally streaked j lustre shining and vitreous ; fracture radiated, parallel or divergent, stel¬ lated ; fragments rather blunt-edged. Colour olive green, pistachio green, reddish brown crystals translucent or semitransparent j semihard ; dif¬ ficultly frangible j rarely feels greasy. Spec. grav. 3, to 3-31- Chem. Char.—Fusible before the blow-pipe into a black slag, a white transparent glass, or a grayish white enamel, Constituent Parts. Bergman, Silica, 64 Magnesia, 20 Alumina, 2.7 Lime, 9.3 Oxide of iron, 4 100*0 Localities, Sic.—It is found in Saxony, Switzerland, Norway, and west side of Inverness-shire in Scotland. Its repository is in primitive mountains, where it is ac¬ companied with ores of lead and iron, as well as with quartz and brown blende. Subspecies 3. Glassy Actynolite. Id. Kirw. i. 168. La Rayonnante Vifreuse, Broch, i. A L O G Y. Part 510. Thallitc, Lametherie, ii. 319. Epidote, Hauy, ciassif, iii. 102. tion, Exter. Char.—Found massive or crystallized in thin six-sided prisms, whose surface is smooth and re¬ splendent •, internal lustre shining, vitreous 5 fracture radiated or wedge-shaped, fibrous 5 fragments splin¬ tery. Colour olive green, leek green, and asparagus green; translucent, or semitransparent •, semihard, or hard j very brittle, and very easily frangible. Spec. grav. 2.95 to 3'49- ... . „ ..." Localities, See.—This variety is found in similar rer positories, and in similar places with the preceding. 14. Species. Tremolite. This is also divided into three subspecies j 1. asbes¬ tous, 2. common,, and 3. glassy. Subspecies 1. Asbestous Tremolite. La Tremolithe Asbestiforme, Broch. i. 514. Gramma- tite. Hauy, 227. Exter. Char.—Found massive, disseminated, and crystallized ; and the crystals are capillary or acicu- larj lustre weakly shining, silky or pearly j fracture radiated or fibrous 5 fragments splintery and wedge- shaped. Colour yellowish white, reddish, greenish, or gray¬ ish j opaque, translucent at the edges j very soft j easily frangible. Subspecies 2. Common Tremolite. La Tremolithe Commune, Broch. i. 515. Exter. Char.—Massive, or crystallized in rhomboidal prisms, with angles of 126° 52' 12", and 530 7' 48". The crystals are deeply striated longitudinally •, exter¬ nal lustre resplendent j internal shining, pearly; frac¬ ture radiated, either parallel, divergent, or promiscu¬ ous ; surfaces of the fracture longitudinally streaked; fragments splintery. Colour greenish white, reddish, or yellowish ; rarely pearl gray ; always translucent; in crystals semitrans¬ parent; semihard; brittle; easily frangible; meagre to the feel. Subspecies 3. Glassy Tremolite. La Tremolithe Vitreuse, Broch. i. 516. Exter. Char.—Massive, or crystallized in long needle or awi-shaped prisms ; internal lustre shining, and sometimes resplendent; vitreous or pearly ; fracture radiated ; cross fracture even, and a little oblique ; fragments splintery. Colour greenish or yellowish white ; translucent; crystals sometimes transparent; semibard ; brittle; easily frangible ; feels meagre. Spec. grav. 2.90 to 3-2, Hauy. Chem. Char.—Before the blow-pipe it melts into a porous white slag. Constituent irt I. MINERALOGY. Constituent Parts. Klaproth. Silica* Lime, Magnesia, Oxide of iron, Carbonic acid 1 and water, j XjOSS, 65. 18. 10.33 .16 6.5 .01 Kaugier. White. 35-5 26.5 16.5 23- Gray Tremolite. 50 18 25 5 2 100.00 101.5 IOO- Physical Char.—By percussion or friction in the dark, a reddish phosphorescent light appears ; and the powder thrown on burning coals yields a greenish Localities, &c,—Tremolite is found imbedded in limestone, in primitive mountains. It was first discover¬ ed in the valley of Tremola by Pini, and hence its name* It is also found in Hungary, Bohemia, and Ca- rinthia, and in the mountains six miles south of Pais¬ ley in Scotland, where it is accompanied with, prehr nite. 15. Species. Smaragdite. Id. Saussure Voy. § 1313. Diallage, Hauy, iii. 125* Id. Brochant, i. 423. and ii. 506. Exter. Char.—Smaragdite has been found massive and disseminated. Internal lustre shining. Fracture foliated. Cleavage single. Fragments rather sharp edged. Colour, grass or emerald green. Slightly translu¬ cent. Semi-hard or soft. Brittle. Spec. grav. 3. Chem. Char.—Before the blow-pipe melts into a gray w greenish enamel. Constituent Parts. Vauqnelin. Silica, 50. Alumina, II. Lime, 13. Magnesia, 6. Oxide of iron, 5.5 ■ chromium, 7.5 —copper, 1.5 Loss, 5.5 ed. Lustre slightly glimmering, resinous. Fracture foliated. Cleavage threefold. Fragments sometimes rhomboidal. Colour grayish green or bluish gray. In thin plates translucent. Scarcely scratches glass. Very soft to the touch, from which it has the name malacolite. Spec, grav. 3.2307 to 3.2368. Chem. Char.—Fusible before the blow-pipe into a porous glass. Constituent Parts. Van quel in. Silica, Lime, 20 Magnesia, 1 q Alumina, 3 Iron and manganese, 4 Loss, 1 100 Localities, &c.—This mineral was discovered by D’Andrada in the silver mines of Sahla in Sweden, and hence it derived its name. It was found by the same naturalist at Busen in Norway. It appears from the observations of Hauy that sahlite and augite are very closely allied, not only in structure and external cha¬ racters in general, but also in their constituent princi¬ ples ; the only difference in their composition is in the proportions of the lime and magnesia, which are small¬ er in augite than in sahlite; but the proportion of iron in the former is considerably greater than in the lat¬ ter. 17. Species. Schalstone, or Tabular Spar. Exter. Char.—This mineral is found massive j lustre shining and pearly ; fracture foliated or splintery, and coarse fibrous ; consists of separate large-grained pieces implicated in each other; and according to Karsten, are very regular. Colour milk white, yellowish or reddish white;. translucent; semi-hard ; brittle. Constituent Parts. Silica, 50 Lime, 45 Water, 5 100 100.0 Localities, &c.—This mineral was found by Saus¬ sure in the vicinity of Turin, imbedded in nephrite clouded white and blue. It has also been found near the lake of Geneva among the rounded pebbles, and in Corsica in primitive rocks. In Italy, tables and orna¬ mental pieces of furniture are made of smaragdite; and the Italian marble-cutters call it verde di Corsica. 16. Species. Sahute. It/. D’Andrada, Jour, de Phys. An. 8. p. 241. Mala- colithe, Hauy, iv. 379. Id. Brochant, ii. 518. Exter. C/kw.-—Found massive or crystallized in six- sided prisms, having two opposite lateral edges truncat- Localities, &c.—This mineral was fii’st noticed by Stutz. It is found in the bannat of Temeswar, and is accompanied by crystallized garnets and calcareous spar. VI. CALCAREOUS Genus. 1. Species. Agaric Mineral, or Mountain Milk. Id. Kirwan, i. 76. Id. Brochant, i. 519. Chaux Car¬ bonate Spongieuse, Hauy, ii. 167. Exter. Char.—This mineral is composed of fine pul¬ verulent particles* slightly united together, and nearly friable. Colour yellowish white, or snow white ; stains strong- iy; i93 * * * * 8 Calcareous genus. MINERALOGY. Part ] K- • feels ir.erigvc; does not adhere to the tongue $ near- larly alumina and silica. The following are the const!- Classifies ly floats on water. tue«t parts of magnesian limestone examined by Mr tion. Chcm. Char.—Effervesces with acids, and is entirely Tennant. 'r| dissolved, so that it is chiefly composed of lime and car¬ bonic acid. Localities, &c.—This mineral is found in the fis¬ sures and cavities of calcareous mountains, and it is supposed that it originates from the destruction of the rocks, the particles of which are carried down to the fissures and cavities by rain water. Abundant in Swit¬ zerland. 2. Species. Chalk. Id. Kinvan, i. 71. La Craie, Brochaut, i. 521. Chaux Carbonate Cray ease, Hauy, ii. 166. Exter. Char.—Found massive; has a dull appear¬ ance ", fracture earthy, and fragments blunt-edged. Colour usually snow or yellowish white, sometimes gray or brown j opaque j stains and writes j very soft, and easily frangible ; feels meagre j adheres a little to the tongue. Spec. grav. 2.31 to 2.65. Chem. Char.—Effervesces with -acids *, before the blow-pipe is calcined, and converted to quicklime. It is almost entirely composed of lime and carbonic acid, with a mixture of a little oxide of iron and some other- substances. Localities, &c.—Chalk forms peculiar stratiform mountains which contain many petrifactions, the mat¬ ter of which is almost always siliceous. They contain also flints arranged in regular strata. No metallic sub¬ stances are found in chalk. A great body of chalk traverses France from south to north, extending from Champaghy to Calais, and continued to England, in the south of which it forms extensive beds. Chalk is also found in the island of Zealand, in the Baltic, in •Poland and many other places. 3. Species. XlMESTONE. This is divided into four subspecies, which arc, I. compact, 2. foliated, 3. fibrous, and 4. pea stone. Subspecies 1. Compact Limestone. This subspecies is again divided into two sections j the first including common compact limestone, and the second roe-stone. Lime, 29.5 Magnesia, 20.3 Carbonic acid, ff?’2 Alumina and oxide of iron, .8 Loss, 2.2 100.0 Localities, &c.—Forms veiy extensive stratiform mountains, and is usually met with along with coal and sandstone. It is very abundant in Saxony, Bohemia, Sweden, France, Switzerland, and Britain. The mag¬ nesian limestone is abundant in Yorkshire and Notting¬ hamshire. Uses.—The uses of limestone for the purposes of building, and when reduced to the state of quicklime, to form the basis of mortar, as wrell as in various arts, are well known. This variety of limestone, when susceptible of a po¬ lish, furnishes marbles ; which name, although it be ap¬ plied to very different stones which are susceptible of a polish, and are fit for sculpture, or ornamental archi¬ tecture, is frequently applied to limestone of this de¬ scription. B. Oolite, or Roe Stoke. Id. Brochant, i. 529. Oviform Limestone, Kirw. i. 91. Chaux Carbonate Globuliforme, Flauy, ih 171. Exter. Char.—This is found massive; internally dull; fracture compact; fragments blunt-edged. Colour yellowush, smoke gray, hair, or reddish brown; opaque ; rarely translucent at the edges; semihard; consists of small globular, distinct concretions : the size of the concretions are very various. Spec. grav. 2.4 to 2.5. Localities, &c.—Roe stone is found in Sweden, Swit¬ zerland, Saxony, and in the south of England. The ketton stone of England, and the celebrated Portland stone, belong to this variety. Of the latter some of the principal public buildings in England and Ireland are constructed. Uses.—It is employed as a building stone ; and when of a fine grain, it is polished and employed as marble. A. Common Compact Limestone. Id. Kirw. i. 82. Id. Broch. i. 523. Chaux Carbonate Compacte, &c. Hauy, ii. 164. Exter. Char.—Found massive ; external form fre¬ quently figured from the numerous petrifactions which it contains ; internally dull; rarely glimmering; frac¬ ture compact, splintery, uneven or earthy ; fragments not very sharp-edged. Colour usually gray, sometimes reddish or yellowish; different colours exhibit spots, stripes, veins, and den- dritical figures; translucent at the edges ; semihard ; brittle ; easily frangible ; feels meagre; gives a grayish white streak. Spec. grav. 2.6 to 2.7. Chem. Char.—Dissolves in acids with effervescence. The constituents of limestone are carbonate of lime, with variable proportions of other earths, and particu- Subspecies 2. Foliated Limestone. Of this there are two varieties, granularly foliated, and calcareous spar. A. Granularly Foliated Limestone. Rierre Calc air e Grenue, Broch. i. 531. Chaux Carlo- nate Sacchardide, Hauy, ii. 164. Exter. Char.—Found only massive; lustre shining, or strongly glimmering ; between pearly and vitreous; fracture straight foliated ; fragments rather blunt- edged ; in granular, distinct concretions, small or fine grained. Colour usually snow white, grayish, yellowish, green¬ ish, and rarely reddish white, and sometimes it is spot¬ ted, veined, or striped ; usually translucent; semihard; feels meagre^ brittle, and easily frangible. Spec. grav. 2.7 to 2.8. Chem. ’art I. MINER Irissifica- Chem. Char.—Effervesces with acitls, and is almost tion. entirely dissolved. Some varieties, however, from an ''■'v ' admixture of other substances, are very slowly acted on by acids. Localities, &c.—Granularly foliated limestone be¬ longs almost exclusively to the primitive and transition mountains, reposing on gneis, micaceous schistus, and clay slate, containing, beside other mineral substances, various metallic ores. It is found in Italy, Saxony, Bohemia, Sweden, Norway, France, and Britain. Uses.—This variety of limestone is applied to the same purposes as the former. Oj Marbles.—In the language of the architect and statuary, all stones come under the name of marble which are harder than gypsum, are found in large masses, and are susceptible of a good polish. On this principle many varieties of limestone, granite \lso and porphyry, serpentine, and even fine-grained basalts, are denominated marbles. But the word among mineralogists is taken in a more restricted sense, and confined to such varieties of dolomite, swinstone, and compact and granularly foliated limestone, as are capable of receiving a good polish. The most valuable of the calcareous marbles, for hardness, durability and colour, are brought from Italy, the Greek islands, and from Syria. When the ancient Homans were at the height of their civilized luxury, they obtained some varieties of marble from Numidia and other countries, which w'ere very much esteemed. The sculptors of ancient Greece and modern Europe have always held the white grannlarly foliated limestone in the highest estimation, both on account of its pure colour, delicate translucence, and granular texture, which make it much easier to work than compact limestone. The species called dolomite is softer and of a finer grain, so that it is even more manageable under the chissel, and therefore many of the smaller works of the Greek sculptors are of this stone *, but Paros and Carrara furnish Europe with the greatest quantity of statuary marble. The Parian marble, which consists almost entirely of carbonate of lime, is the purest, softest, and has some degree of transparency; that of Carrara is often mixed with granular quartz in considerable proportion. The following are the archi¬ tectural marbles which are held in greatest estimation. 1. Phe marble called bai'diglio, from Carrara, is of a deep blue colour, and seems to be the same with the white statuary marble of that place, with the addition of some colouring matter. 2. That variety of marble called cipolin, is statuary marble traversed by veins of mica. 3. Lvmachella marble. This is a compact limestone of a brownish gray colour, containing shells which often retain the original pearly lustre. To this variety belongs the fire marble ol Bleyberg in Carinthia, in which the imbedded shells are beautifully iridescent. 4. Florentine marble. This is a grayish, compact, argillaceous limestone, exhibiting designs of a yellowish brown colour, and resembling the ruins of houses : hence it is called ruin marble. 5. The marbles of Syria, Sienna, and Arragon, are ol a yellow colour, and are in considerable estimation. 6. Brocatello marble. This is a breccia limestone, composed of fragments of a yellowish red and purple 4 A L O G Y. colour which are cemented by semitransparent, white calcareous spar. 7. The marbles known by the names of vcrde antic he, vcrde di Corsica, are composed of limestone, calcareous spar, serpentine, and asbestus. 8. The British islands afford many fine marbles, of which that of Tiree is the finest and most beautiful. It has often a delicate flesh-coloured ground, spotted with green ; but its colours, it is said, are apt to fade. Marbles have also been found in the island of Skye, and in the counties of Ross and Sutherland. For a particular account ol these, see Williamses Mineral Kingdom. Marble is not uncommon in different parts of England 5 and in particular Devonshire and Derby¬ shire afford varieties which are held in considerable es¬ timation on account of their beauty. Elastic marble. Some varieties of granular limestone, when cut into thin plates, possess a certain degree of elasticity. I he marble in which this property was observed, was in the Borghese palace at Rome. It was got flora an a„ncient building. Dolomieu supposed that ni'11 ble acquired this property by bcmi^ deprived of moisture, and Fleuriau de Bellevue confirmed this opinion, by subjecting certain marbles to heat. He found also a natural elastic marble in Mount St Got- hard. *99 Calcareous genus. B. Calcareous Spar. Common Spar, Kirw. i. 86. Le Spat/i Calcaire, Broch. i. 536. Chaux Carbonates, Hauy, ii. 127. Essen. Char.—Divisible into a rhomboid of and 785°: soluble with effervescence in nitric acid. F.xter. Char.—Calcareous spar is found massive, or disseminated in various forms, as globular, kidneyform, cellular, and stalactitical j but it is most frequently cry¬ stallized. The primitive form of its crystals is an obtuse rhomboid, whose angles are ioi° 32' 13,' and 78° 47 1 ? integrant molecule the 'same. The variety of forms of calcareous spar is very great. Werner reduces them to three principal or prevailing forms, and from these he deduces the variations and modifications which take place. His principal forms are, 1. The six-sided pyramid; 2. The six-sided prism ^ and, 3. The three- sided pyramid. But according to others following the same method, the principal forms are the five follow¬ ing: 1. The six-sided pyramid ; 2. The six-sided prism j 3. 1 he six-sided table; 4. The three-sided pyramid; and, 5. The hexahedron, including the rhomboid and cube. 1. The six-sided pyramid is either simple or double. A. Simple. Simple pyramids are the summits of other pyramids, or of prisms, and they are variously modified in being equal sided, acute, or obtuse, having the angles at the base truncated, or having an obtuse three-sided summit slightly convex. B. Double ; in which two pyramids are obliquely united, and variously modified, by having the angles at the base truncated, or the faces of the summit a little convex. 2* I he six-sided prism, is also variously modified, by having at each extremity a six-sided acute summit, or a second obtuse summit of three sides, placed alternately on three edges of the first. 3. A six-sided table, which is either perfect with equal or unequal sides, or rounded, or lenticular. 4. The 200 mineralogy. Part I Calcareous 4- The three-sided pyramid, which is either simple genus, or double, and is also variously modified. ' " v ' 1 -' The hexahedron, which includes the rhomboid, and this is either perfect, or has convex faces, or has six obtuse edges truncated j and the cube, which is some¬ what rhomboidal. But for a full account of all the va¬ rieties and modifications in the crystallization of calca¬ reous spar, the reader is referred to the treatises of Ilauy and Brochant. The crystals of calcareous spar exhibit also a simi¬ larity of arrangement. The simple six-sided pyramids are frequently disposed in a globular, fascicular, or stellated form. The six-sided pyramids are disposed in rows; the six-sided prisms are often disposed like steps of stairs, or . are fascicular, or kidney-form $ some acute three-sided pyramids of calcareous spar have been found hollow, and in some prisms the centre has been observ¬ ed of another colour. The surface of the crystals com¬ monly smooth ) lustre shining or resplendent 5 internal lustre resplendent or shining, vitreous, and sometimes pearly j fracture foliated ; cleavage threefold j frag¬ ments always rhomboidal. Colour usually white, grayish, reddish, greenish, or yellowish, white, rarely violet blue, or yellowish brown. Various degrees of transparency y when perfectly trans¬ parent, refraction is double. It was in this substance that the property of double refraction was first observed, and hence it was called double spar. T-his singular pro¬ perty engaged the attention and mathematical skill of Newton, Huygens, Buffon, and more lately the cele¬ brated Hauy. Calcareous spar is semihard, brittle, and easily frangible. Sp. grav. about 2.7- Chem. Char.—Soluble with effervescence in nitric acid, and reduced by calcination to quicklime. * VHl Mag. xiv. apo. Constituent Parts. Lime, Carbonic acid, Water, Bergman. 55 33 11 100 Phillips*. 55-5 44. •5 100.0 Physical Char.—Some varieties of calcareous spar, and particularly those from Derbyshire, give out, when heated, a phosphorescent light. Localities, &.C.-—Calcareous spar is very common in all kinds of rocks, in veins and cavities, and particularly in mineral veins, accompanied with quartz, fluor spar, heavy spar, and metallic ore. The finest specimens of rhomboidal spar are brought from Iceland, Derbyshire, the Hartz, as well as Saxony, France, and Spain. The crystallized sandstones of Fontainebleau are real rhomboidal crystals of calcareous spar, which, during the process of crystallization, have been penetrated with particles of sand. Subspecies 3. Fibrous Limestone. Id. Kirw. i. 88. La Pierre Calcaire Fibreuse, ou la Stalactite Calcaire, Broch. i. 549. C/taux Carbonatee Conoretionnee, Hauy, ii. 168. Of this subspecies two varieties have been formed, ’Common fibrous, and calcareous sinter. 3 A. Common Fibrous Limestone:. ciassifica, tien. Fxter. Char.—Found massive-, lustre weakly shining Y i and pearly ; fracture fibrous, sometimes coarse and deli¬ cate, straight or parallel, and sometimes radiated j frag¬ ments splintery. Colour usually grayish, reddish, and yellowish white j generally translucent rarely semitransparent. Localities, &c.—This variety is found in veins -, and some of it is susceptible of a fine polish, and was known to the ancients under the name of calcareous alabaster, to distinguish it from gypseous alabaster. Sat tin spar, a beautiful mineral, which is also sus¬ ceptible of a fine polish, and has a sickly lustre, from which it derives its name, belongs to this variety. It was first discovered in Cumberland, and is but rarely met with in other places. B. Calcareous Sinter. This variety is usually found stalactitical or tuberose, and also sometimes kidney-shaped, botryoidal, tubular, and coralloidal. Surface uSually rough, or drusy, rare¬ ly smooth j internal lustre glimmering, sometimes weak¬ ly shining, silky, or pearly ; fracture fibrous, which is either straight, scopiform, or stellular; fragments wedge-shaped and splintery. Colour snow white, grayish green, or yellowish white, and these are sometimes arranged in stripes or veins j translucent, sometimes only at the edges j rarely semi¬ transparent 5 between semihard and soft j brittle and easily frangible. Sp. grav. 2.728. Localities, &c.—This mineral seems to be a depo¬ sition of calcareous particles, formed by the gradual in¬ filtration of water into the cavities and fissures of lime¬ stone mountains. They are either deposited in layers on the floor, or suspended from the roof of those grottoes, and in this latter case they assume a great variety of imitative forms. It is found therefore in the celebrat¬ ed grottoes of Auxelles, Arcy, and Antiparos, and in the cavities of mineral veins at Leadhills. The singular mineral substance, known by the name oijlos Jerri, belongs to this variety. This is found in the cavities of veins of spathose iron ore, from which it has derived its name. It is of a branched or coralloidal form. Subspecies 4. Pisolite or Pea-stone. Oviform Limestone, var. Kdnv. i. 91. La Pierre depots, Broch. i. 555. Chaux Carbonatee Globidiforme, Hauy, ii. 171. Fxter. Char.—This mineral is found massive, and in the cavities in which it is formed, the surface is kidney¬ shaped ; internally dull; fracture difficult to determine, but appears even j fragments rather sharp-edged. Colour white, snow white, grayish, reddish or yel¬ lowish white j opaque 5 rarely translucent at the edges j soft, and brittle. Localities, &.c.—Pisolite is found at Carlsbad in Bohemia, where it has been long known, and where an entire bed was discovered in digging the foundations for a church. Each of the grains of pisolite contains for a nucleus a particle of sand. These have been in- crusted with the carbonate of lime held in solution by water, irt I. tssifica- water, and particularly by the warm springs of Carls- tion. bad. New concentric layers being deposited, they at -y-““,/last fall to the bottom, and are there united into larger masses by new depositions of the same calcareous matter. Pisolites are also found in Hungary and in Silesia. 4. Species. Calcareous Tufa. Extet\ Char.—This mineral has usually the form of the substance on which the calcareous matter has been deposited, as that of moss which is most com¬ mon, grass or leaves ; internally dull, or weakly glim¬ mering ; fracture uneven or earthy; fragments blunt- edged. Colour yellowish gray of various shades ; opaque, or translucent at the edges 5 soft, sectile, and easily fran¬ gible j light; almost swims on water. Localities, &c.—This substance is found in all lime- stQue countries, through the strata of which water passes, thus forming springs impregnated with carbonate of lime, which is aftei*wards deposited on plants or other substances. This mineral, therefore, is found in alluvial land, and the process of its formation is constantly rm- ing on. 5. Species. Foam Earth. Silvery Chalk, K_irw. i. 78. L'Ecumede Terre, Broch. *• SSI- Exter. Char.—This mineral is found massive, dis¬ seminated, or in scaly particles, which are somewhat friable; internal lustre shining or semimetallic; the solid varieties have a curved foliated fracture ; frag¬ ments blunt-edged. 5 Colour yellowish or greenish white, sometimes silvery white ; opaque ; stains ; very soft or friable ; feels a little greasy or silky. Chem. Char.—Effervesces and dissolves in acids. MINERALOGY. Chem. Char.—Effervesces briskly with acids. Constituent Parts. Lime, Carbonic acid Silica, Oxide of iron, Water, S'-S 39- 5-7 3-2 1. Constituent Parts. 201 Calcareous genus. Carbonate of lime, Silica, Oxide of iron, Loss, 98.11 •05 .8 1.04 100.00 Localities, &c.—This mineral is found in Saxony, in a bed of limestone, where it is accompanied with ga¬ lena ; in Norway; and in Cornwall in England. 7. Species. Arragonite. Arragon Spar, Kirw. i. 87. 576. Id. Haiiy, iv. 337. VArragonite, Broch. i. 100.5 Exter. Char.—^Ihis mineral is always found crystal¬ lized in six-sided equiangular prisms, or with two op¬ posite laces broader, to which correspond the two faces 01 an acute bevelment, which terminates the prism. I he edges of the bevelment are also truncated. The crystals are variously grouped, and commonly in tire form of a cross; crystals streaked longitudinally; lustre shining or resplendent, vitreous ; fracture foliated. Colour grayish or greenish white; translucent and semitransparent; refraction double; hard, scratches calcareous spar ; brittle, and easily frangible. Speci¬ fic gravity 2.946. Chem. Char.-—Effervesces with acids, and is entire¬ ly dissolved. The constituent parts, according to nu¬ merous and accurate analysis, are the same as those of calcareous spar; but its superior hardness, diver¬ sity of form, and other external characters, have long puzzled chemical philosophers ; and it still remains un¬ determined to what that diversity is owing in this mi¬ neral. Localities, &c.—Arragonite was first found imbed¬ ded in foliated and fibrous gypsum, in the province of Arragon in Spain, from which it derives its name. It has been also found in France, the Pyrenees, in Saltzburg, sometimes in an argillaceous schistus, and sometimes in quartz, accompanied by calcareous spar and pyrites. localities, &c.—This mineral has been found in mountains of stratified limestone at Jena in Misnia, and at Eisleben in Thuringia. ^ This is considered by some as belonging to the fol- -owing species, and by others as merely a variety of a- garic mineral. 6. Species. Slaty Spar. Argentine, Kirw. i. 105. Le Spathe Sc hist tux, Broch. ]- SS*‘ Schiefer Spath of the Germans. Id. Phillips, I hil. Mag. xiv. 289. and 293. Exter. Char.—Found massive or disseminated ; in- ternal lustre shining, pearly ; fracture curved foliated; uagments wedge-shaped, or blunt-edged. , 7lour grayish, reddish, or yellowish white ; translu- 6 VolS°XIV 11paert’ /Cels £reasy* Sljec- £rav* 2.723. 8. Species. Brown Spar. Sutcro-Calcite, Kirw. i. 105. Le Spath Erunissant, Broch. i. 563. Chaux Carbonates Ferrifere Perlee, Hauy, ii. 179. , Exter. Char.—Found massive or disseminated, or in kidney-shaped, globular, or carious pieces ; very often crystallized. The forms are lenses or rhomboids, which latter have either convex or concave faces ; double pyramids composed of two pyramids with three obtuse faces: simple three-sided pyramids, and oblique six- sidca pyramids. I lie surface of the crystals drusy, laiely smooth ; lustre weakly shining or shining ; in¬ ternal lustre shining, pearly, or vitreous; fracture fo¬ liated ; fragments rhomboidal. Colour milk-white, grayish, yellowish, or reddish ■white; bright or brownish rod; translucent at the € c edges; 20 2 Calcareous genus. MINER edges j semihard; brittle, easily frangible j streak grayish white. Spec. grav. 2.83. Chem. Char.—Becomes black and hard berore the blow-pipe, and unless reduced to powder, effervesces slowly with acids. A L O G Y. , Pan blow-pipe without splitting or fusion. Effervesces a class little with acids. tied Constituent Parts. Carbonate of lime, Oxide of iron, Oxide of manganese, Bergman. 50 22 28 100 Localities, &c.—Brown spar is found in Bohemia, Saxony, France, Sweden, and Britain. It is usually found in metallic veins. 9. Species. Dolomite. Id. Kirw. i. Hi. Dolomie, Brochant, i. 334. Chaux Carbonatee Aluminifere, Hauy, ii. 173. Ex ter. Char.—Found massive y fracture appears to be foliated ; fragments blunt-edged. Colour grayish or yellowish white, translucent on the edges j semihard y rather difficultly frangible , ieels meagre. Spec. grav. 2.85. Constituent Parts. Saussure. Lime, Alumina, Magnesia, Oxide of iron, Carbonic acid, Loss, 44.29 5.86 I-4 •74 46. I*7I 100.00 10. Species. Rhomb or Bitter-Spar. Constituent Parts. Klaproth. Carbonate of lime, . 52 73 magnesia, 45 25 Oxide of iron and manganese, 3 100 100 Localities, &c.—Found in the Tyrol and Saltzburg, and in Sweden. It is always accompanied with asbestus, talc, and tremolite, and imbedded in chlorite schistus* serpentine, and indurated talc. 11. Species. Swine Stone. Id. Kirw. i. 89. La Pierre Puante, Brochant, i. 567. Chaux Carbonatee Fvctide, Hauy, ii. 288. Exter. Char.—Found massive ; internal lustre glim¬ mering or dull ; fracture splintery, sometimes earthy or foliated ; fragments splintery. Colour grayish black, or blackish brown ; opaque, rarely translucent at the edges} streak grayish white y semihard, sometimes soft j easily frangible. Spec. grav. 2.71. Phys. Char.—When rubbed with a hard body, it gives out a very foetid odour of rotten eggs. & Chem. Char.—Soluble with effervescence in nitric acid •, before the blow-pipe is deprived of its odour, which is supposed to be owing to sulphurated hydro¬ gen. Localities, &c.—Forms entire beds in stratiform limestone rocks, as in trance, Saxony, and Sweden. 12. Species. Marl. Chem. Char.—Effervesces slowly in nitric acid. Phijs. Char.—Phosphoresces in the dark by the per¬ cussion of a hard bodv. Localities, &c.—This stone was first observed by Dolomieu, among the ancient monuments of Rome and afterwards he discovered similar stones in the mountains of the Tyrol and the Alps. It is found abundantly on St Gothard and other primitive mountains. Dolo- mieu’s attention was first attracted to it by its supe¬ rior hardness and slow effervescence in acids, and ana¬ lysis shews that it is different from limestone in its com¬ position. This is divided into two subspecies 5 1 earthy 5 and, 2 indurated. Subspecies 1. Earthy Marl. Id. Kirw. i. 74. La Marne Terreuse, Brochant, i. 569. Argile Calcariferc, Hauy, iv. 455. Crystallised Muricalcite, Kirw. i. 92. Le Spath Mag- nesien, Brochant, i. 560, Chaux Carbonatee Mag- nesifere, Hauy, ii. 187. Exter. Char.—This variety is composed of loose or slightly coherent particles ; stains a little ; feels meagre and rough ; is light; almost swims on water. Colour yellowish gray, or grayish white. Localities, &c—lound m many places of Iiance and Germany, as well as in different places of England and Scotland, forming beds in limestone countries, and often immediately under the soil. Uses.—It is sometimes employed in the manufacture of pottery, but its principal use is for the purposes of agriculture. Exter. Char.—Found massive or disseminated in rhomboidal pieces, which have a crystallized appear¬ ance lustre shining or resplendent, and vitreous or pearly *, fracture foliated } cleavage threefold 5 frag¬ ments rhomboidal. Colour grayish white, yellowish or reddish brown •, translucent at the edges •, semibard 5 brittle ; streak snow-white. Spec. grav. 2.48. Chem. Char.—Becomes gray or brown before the Subspecies 2. Indurated Marl. Id. Kirw. i. 95. La Marne Endurcie, Brochant, i. 571 Exter. Char.—Found massive, dull, or slightly glim mering*, fracture earthy, splintery, or slaty ; fragments blunt-edged. Colour yellowish, or smoke gray *, opaque} streaK grayish white } soft 5 not very brittle ; easily frangible. Spec. grav. 1.6 to 2.8. ^ lift I. i'siilca- ton. r Chan. Char.—-Melts before the blow-pipe into a grayish black slag; effervesces briskly with acids. Marl is considered as a mixture of carbonate of lime and alumina j and according to the different proportions of these ingredients, it is denominated calcareous marl or clay marl, and sometimes it is known in agriculture by the names of soft and hard marl. Localities, &c.—Found in Bohemia, Saxony, Swe¬ den, Italy, France, and Britain, in stratiform mountains, sometimes in extensive beds, frequently accompanying limestone, coal, and basalt. Uses.—It is employed in agricultui’e for improving the soil, sometimes for building, and sometimes as a limestone. It serves also as a flux for some ox-es of iron. 13. Species. Bituminous Marl Slate. Marno-bituniineux, Brochant, i. 574. Chaux Carbonatee JSituminifere, Hauy, ii. 189. Exter. Char.—Found massive j surface rough, dull, rarely glimmerings or when divided into curved plates, smooth and shining 5 fracture slaty 5 straight or waved j fragments tabular. Colour grayish or brownish black j opaque ; streak shining j soft; easily frangible ; feels rather meagre. Chan. Char.—Effervesces with acids j inflames be¬ fore the blow-pipe 5 gives out a bituminous odour, and then melts into a black slag. Localities, &c.—Foilnd in diffei'ent places of Thu¬ ringia, in mountains of stratiform limestone, forming particular beds, which repose frequently on a species of sandstone. It is frequently mixed with different ores of copper, so that it is sometimes wrought as a copper ore. In this bituminous schistus, petrified fishes and marine plants are frequently found, disposed in regular order, from which some have conjectured that they must have died a violent death j or, according to others, that they have been poisoned by the copper with which it abounds. 14. Species. Apatite. Phospholite, Kirw. i. 128. L'Apatite Commune, Bro¬ chant, i. 580. Chaux Phosphate'e, Hauy, ii. 234. Exter. Char.—Found almost always crystallized, rare¬ ly disseminated. The forms of its crystals are, 1. A regular six-sided prism 5 2. The same prism truncated on its lateral edges j 3. Also on its angles and terminal edges j 4. Bevelled on each of the lateral cdges ; 5. V\ ith an obtuse and regular six-sided pyramid, and one or both extremities, the summit being slightly truncated j 6. A three-sided prism with the lateral edges bevelled, and the terminal edges truncated ; 7. A six-sided table, having its terminal edges strongly, and the lateral edges slightly truncated. Lateral faces of the prisms longitu¬ dinally streaked ; faces of the pyramid smooth \ lustre shining and resplendent; internal lustx-e shining, be¬ tween resinous and vitreous. Cross fracture foliated ; in other directions fine gx-ained, uneven,' or conchoidal. Fragments rather sharp-edged. Colour green of various shades, blue, sometimes pearl gray, and greenish gray 5 semitransparent, some¬ times transparent, or only translucent; semihard 5 is scratched by fluor spar; brittle, and easily frangible. Spec. grav. 2.8 to 3.2. MINERALOGY. 203 Chem, Char.—Thrown on hot coals it gives out a Calcareous greenish phosphorescent light $ infusible before the blow- genus, pipe, but loses its coloux*. It is almost entirely soluble '——v— in nitric acid. Constituent Parts. Klaproth. . . 55 i hosphoric acid, 45 IOO Phys. Char.—Becomes electric by friction, but not by heat. Localities, &e.—Apatite is found in diffei'ent places of Germany, chiefly in tin mines, where it is accom¬ panied by fluor spar, quartz, and metallic ores. It is also found in Cornwall in similar circumstances. 15. Species. Asparagus Stone. LaPierre (TAsperge, Broch. i. 586. Chaux Phosphate'e, Hauy, ii. 234. Exter. Char.—This mineral has been only found crystallized in equiangular six-sided prisms, terminated by a slightly obtuse six-sided pyramid ; lateral edges sometimes truncated j lateral faces longitudinally streak¬ ed, the others smooth ; external lustre shining or re¬ splendent 5 internal, resplendent and resinous; fractux-e foliated, cross fractux-e imperfectly conchoidal j frag¬ ments not very sharp-edged. Colour asparagus green, greenish white 3 commonly transparent, often only semitransparent, or even trans¬ lucent; semihard. Spec. grav. 3.09. Chem. Char.—Infusible before the blow-pipe; solu¬ ble with effervescence in nitric acid, but thrown on hot coals does not phosphoi'esce. Constituent Parts. Vauquelin. Lime, Phosphoric acid, Loss. 53-32 45-72 .96 100.00 Localities, &c.-—This stone has been found at Ca- prera, near Cape de Gates in Spain, and also, it is said, near Arendal in Norway. 16. Species. Phosphorite. L*Apatite Terreuse, Broch. i. 584. Chaux Phosphate? Terrcilse, Hauy, ii. 239. Exter. Char.—Found massive, and having little co- hex*ence ; dull; fracture earthy, or fine grained uneven; fragments blunt-edged, sometimes wedge shaped. Colour yellowish or grayish white; opaque; semi¬ hard ; often friable ; easily frangible ; feels meagre. Spec. grav. 2.82. Chem. Char.—Before the blow-pipe it phosphoresces, and according to some, melts into a white glass, but according to others, infusible. Soluble in acids, and with sulphuric acid gives out white vapours. C c 2 Constituent 204 Calcnreous genus. MINERALOGY. Part Constituent Pa?'ts. Pelletier. Jjime, 59- Silica, 2. Phosphoric acid, 34. Fluoric acid, 2.5 Carbonic acid, I. Muriatic acid, .5 Oxide of iron, 1. 100.0 Localities, &c.—This mineral is found in the north of Scotland, and in the province of Estremadura in Spain, where it forms an entire mountain. It is mixed with quartz 5 has been long known by the inhabitants of the country for its property of phosphorescing when thrown on hot coals. 17. Species. Fluor. This has been divided into three subspecies ; 1. earthy j 2. compact j and, 3. fluor spar. Subspecies 1. Earthy Fluor. Sandy or Earthy Fluor, Eirw. i. 126. Le Fluor Ler- reu.v, Broch. i. 593. Chaux Fluatee Amorphe, Hauy, ii. 260. Exter. Char.—Is composed of particles which are slightly cohering *, dull, or scarcely glimmering. Colour greenish white, sometimes bluish green j stains a little ; feels rough. Chem. Char.—Thrown on hot coals, it gives out a bluish green light. Localities, &c.—Has been found in Hungary, in a vein accompanied with quartz. Subspecies 2. Compact Fluor. Id. Kirw. 127. Id. Broch. i. 594. Exter Char.—Is found massive j dull, lustre some¬ times glimmeiing, vitreous ; fracture even, conchoidal, and rarely splintery fragments sharp-edged. Colour greenish gray, or greenish white } sometimes different colours are disposed in spots j translucent 3 streak shining j hard, and brittle. Chem. Char.—Phosphoresces on hot coals. Localities, &c.—This mineral is found in the Hartz, in Sweden, and Siberia, always accompanying fluor its angles a three-sided pyramid, corresponding to the Classi{. faces of the cube. 2. The octahedron, which is either tioiuj perfect, or has its angles or its edges, or both, trunca- 'T' ted. Surface of the crystals smooth, shining or re¬ splendent, sometimes drusy 3 internal lustre shining, re¬ splendent, and vitreous or pearly 3 fracture foliated, straight or curved 3 cleavage fourfold, in the direction of the faces of the regular octahedron 3 fragments te¬ trahedral, or rhomboidal. Colours of fluor spar extremely various and beautiful. The principal are, greenish white, grayish, or yellow¬ ish 3 blue, green, brown, and red, of various shades 5 and different colours are sometimes arranged in stripes and spots. Most commonly translucent, sometimes transparent, or only translucent at the edges. Semi- hard 3 brittle 3 easily frangible. Spec. grav. 3.09 to Chem. Char.—Fusible before the blow-pipe into a transparent glass 3 decrepitates when heated. I he powr- der thrown on hot coals gives out a bluish or greenish phosphorescent light 3 and two pieces rubbed against each other, shine in the dark. Constituent Parts. Scheele. Lime, 57 Fluoric acid, 16 Water, 27 100 Localities, &c.—Fluor spar is sometimes found in beds, but most frequently in mineral veins. It is very common in many places of the world, particularly in Cornwall and Derbyshire, and also in the counties of Durham and Cumberland in England 3 at Chamouni in Savoy, the octahedral variety of a rose red colour is found. Fluor spar is found also in the interior part of Aberdeenshire in Scotland. Uses.—This mineral is successfully employed as a flux for different metallic ores. As it is susceptible ot a fine polish, it is cut and formed into a great variety oi ornamental objects, as pyramids, vases, &c. which, on account of the beauty of the colours, are greatly es¬ teemed. 18. Species. Gypsum. This species is divided into four subspecies: I. earthy 3 2. compact 3 3. foliated 3 and, 4. fibrous. spar. Subspecies 3. Fluor Spar. Foliated or Sparry Fluor, Kirw. i. 127. Le Spath Fluor, Broch. i. 595. Chaux Fluatee, Hauy, ii. 247. Essen. Char.—Insoluble in water, and divisible into 3 regular octahedron. Exter. Char.—Fluor spar is found massive or dissemi¬ nated, but most frequently crystallized. Primitive form a regular octahedron, which is easily obtained by me¬ chanical division 3 integrant molecule a regular tetra¬ hedron. The usual forms are, 1. The cube, which is sither perfect, or with truncated edges or truncated angles, or with the edges bevelled, having on each- of Subspecies 1. Earthy Gypsum. Farinaceous Gypsum, Kirw. i. 120. Le Gypse Ter- reux, Broch. i. 601. Chaux Sulphatee Terreuse, Hauy, ii. 278. Exter. Char.—This is composed of particles which are more or less cohering 3 dull, in some places weakly glimmering ; feels meagre and rough. Colour white, gray, or yellowish. Localities, &c.—This substance is rare ; it is only found in the fissures and cavities of gypsum rocks, and is supposed to be a deposition of loose particles of gyp¬ sum, carried along by water. Found in Saxony, and Monte Martre near Paris. Subspecies MINE BALOG Y. j t I. jiiifiea- on. Subspecies 2. Compact Gypsum. L-—' , Id. Kirw. i. 121. Id. Broch. i. 602. Id. llauy, ii. 278. Extei\ Char.—Found massive } lustre weakly glim¬ mering, almost dull ; fracture compact, even, or splin¬ tery ; fragments blunt-edged. Colour yellowish and grayish white, sometimes red¬ dish 5 and different colours exhibit stripes ; translucent at the edges j solt, and easily frangible. Spec. grav. about 2.3. Localities, &c.——Found in Italy, Germany, France, Spain, and England. Subspecies 3. Foliated Gypsum. Granularly Foliated Gypsum, Kirw. i. 123. Id. Broch. 'i. 606. Exter. Char.—Found massive or disseminated, and sometimes, it is said, crystallized in six-sided prisms, obtusely bevelled at each extremity ; lustre glimmering or shining, between vitreous and pearly j fracture fo¬ liated, sometimes radiated ; fragments blunt-edged. Colour usually snow white, grayish, yellowish, or reddish white ; and several colours are arranged in spots, stripes, and veins. Translucent, rarely semitransparent j refraction double 5 very soft j easily frangible. Spec, grav. 2.27 to 2.31. Foliated gypsum has some resemblance to granular limestone, but may be readily distinguished from it by its softness. Subspecies 4. Fibrous Gypsum. Id. Kirw. i. 122. Id. Broch. i. 604. Id. Hauy, ii. 278. Exter. Char.—This is found massive, but in thin layers j lustre shining, or weakly shining, pearly ; frac¬ ture fibrous j in some varieties the longitudinal fracture is loliated 5 cross fracture fibrous j fragments long, splintery. Colour snow white, grayish, yellowish, or reddish white ; translucent j very soft; easily frangible. Chem. Char.— T.he different varieties ot gypsum pos¬ sess nearly the same chemical characters. When pure, there is no effervescence with acids. Before the blow- PlPe gypsum immediately becomes white, is converted into a white enamel, which, at the end of 24 hours, falls into powder. Localities, &c.—Gypsum, in general, constitutes mountains or beds, which are subordinate to sandstone, or limestone. It is found in all kinds of rocks. Gyp¬ sum is lound in great abundance in the neighbourhood of Paris, in several parts of England, but sparingly in •Scotland. Uses.—Gypsum is employed along with lime as a ce¬ ment. It is also very extensively employed under the name of plaster of Paris, for .Laking casts and models. With this view it is exposed to a strong heat, to drive ('ff the water of crystallization. It is then in the state of powder, which being again mixed with water, is put snto the mould in the form ot paste ; and, from its strong affinity for water, it soon becomes solid.. 20 c . - Calcareous Ip. DpecieS. OELENITE. genus. Broad Foliated Gypsum, Kirw. i. 123. La Selenite, v ' " ' Broch. i. 609. Chaux Sulfatee, Hauy, ii. 266. Essen. Char.—Divisible into smooth plates, which break under angles of 1130 and 67°. Exter.Char.—Seleniteisfoundmassive; andfrequent- ly also crystallized. The primitive form of its crystals is a four-sided prism, whose bases are obliquely parallelo¬ grams ; the integrant molecule is the same. The usual ioims are, a six-sided prism, having two broad and two nanow faces, and terminated by an oblique bevelment, whose sides correspond to the broad sides of the prism ; a similar prism terminated by a four-sided pyramid ; double crystals composed of two of the former united by their smaller lateral faces, so that the summits united form on one side a salient angle, and on the other a re¬ entering angle ; another form is a spheroidal or conic lens. 1 hese crystals arc often grouped, divergent, fas- cicular, or stellated ; and of the six sides of the prism, the two opposite are smooth, and the four others longi¬ tudinally streaked ; lustre resplendent or shining, be¬ tween vitreous and pearly ; fracture foliated, straight or curved ; cleavage threefold ; fragments rhomboidal, with two faces smooth and shining, and two others streaked. Colour usually white, grayish, yellowish, or snow white, sometimes iridescent ; transparent, sometimes only translucent; very soft; in thin plates, flexible, but not elastic ; easily frangible. Spec. grav. 2.32. Chem. Char.—Before the blow-pipe more easily fusi¬ ble than gypsum, and splits into thin plates. Constituent Parts. Lime, Sulphuric acid, Water, Bergman. 32 46 22 100 Localities, &c—Selenite is found among beds of gypsum, and particularly among those which alternate with clay and sand-stone. It is also found in nests in clay. It is not uncommon in many places, as among the gypsum rocks near Paris, in different parts of Eng¬ land, and at Lord Glasgow’s coal works in Scotland, where it is found among clay, and in the cavities or on the surface of the limestone which reposes on the strata of coal. Uses.—Selenite also, after calcination, is employed in modelling; but it is said that it possesses less solidity than what is obtained from gypsum. 20. Species. Anhydrite. Chaux SulfatSe Anhydre, Hauy, iv. 348. Exter. Char.—This mineral is found massive ; lustre shining or weakly shining, and pearly ; fracture curved foliated, sometimes radiated, and fine splintery : frao-- ments sharp-edged; translucent; semihard; not very brittle, rather easily frangible. Spec. grav. 2.964. Chem. Char.—Before the blow-pipe it neither exfoli¬ ates nor becomes white, like selenite. Constituent :o6 mineralogy. Fart I Constituent Parts, Yauquelin. Klaproth. Lirr.e, 4° Sulphuric acid, 60 57* Oxide of iron, — 'l Silica, “ Loss, — *65 100 100.CO Localities, &c—This mineral has been found in Switzerland, in the salt pits in the canton of Berne. 2i. Species. Cube Spar. Chaux Sulfatee Anhjdre, Hauy, iv. 348. Saude Muri- atee Gypsifere, Id. ii. 3^5* Munacite, Klaproth. Exter. Char.—This mineral is found massive, and al¬ so crystallized, in four-sided prisms, which are nearly cubical •, two of the opposite lateral faces are broader than the other two. The lateral edges are sometimes truncated, and hence arises an eight-sided prism : some¬ times also the truncations are so great as to destroy the narrow lateral faces, and form again a six-sided prism. External lustre of the broad faces resplendent and pear¬ ly ; of the narrow, shining. Internal lustre shining and pearly j fracture foliated cleavage threefold j fragments cubical. Colour milk-white, grayish, yellowish, and reddish white 5 sometimes pearl gray } translucent 5 semihard. Spec. grav. 2.92 to 2.96. Constituent Parts. Klaproth. Sulphate of lime, Carbonate of lime, 11. Muriate of soda, 31,2 100.0 Localities, &c.——1 ound in the salt pits at Halle in the Tyrol, where it is called splintery gypsum. 22. Species. Datholite. Localities, &c.~—Found near Arendal 10 -Norway, Classifica. and some specimens are accompanied by greenish-co- t don, loured, foliated talc. VII. BARYTIC Genus. I. Species. Witherite, or Carbonate of Barytes. Barolite, or Aerated Barytes, Kirw. i. 134, La Iff therite, Brochant, i. 613. Baryte Carbonatee, Haiiy, ii. 308. Essen. Char.—Forming a white precipitate in weak nitric acid before solution. Exter. Char.—Found massive,or disseminated, rarely crystallized *, forms of its crystals are, a six-sided prism, with a six-sided pyramid set on the lateral faces ; the same prism having all the angles truncated j a double six-sided pyramid. The crystals, which are small, are usually imbedded in the mineral itself; sometimes group¬ ed in bundles, or crossing each other. Surface smooth; lustre of the principal fracture shining,orweaklyshining, resinous ; fracture between radiated and foliated; cross fracture fine grained uneven ; fragments wedge-shaped. Colour yellowish gray, grayish, or yellowish white } translucent, or semitransparent; semihard, or soft; brittle ; easily frangible. Spec. grav. 4.3 to 4.33. Chem. Char.—Infusible according to Hany before the blow-pipe ; but according to Brochant, melts before the blow-pipe to a white enamel. Constituent Parts. Pelletier. Vauquelin. Barytes, 62 74*5 Carbonic acid, 22 25-5 Water, 16 — 100 100.0 Constituent Parts according to Elaproth. Carbonate of barytes, 98.246 Carbonate of strontites, I-703 Alumina iron, *043 Carbonate of copper, .008 Chaux Datholite, Brochant, ii. 397. Chaux Boratee Si- liceuse, Haiiy. Exter. Char.—This mineral has only been found crystallized ; the primitive form is a rectangular prism, with rhomboidal bases, whose angles are 109° 18' and 70° 42'; lustre shining, vitreous ; fragments conchoi- dal. Colour grayish or greenish white ; translucent ; scratches fluor spar. Spec. grav. 2.98. Chem. Char.-—In the flame of a candle it becomes dull white, and is easily reduced to powder. Before the blow-pipe it melts into a glass ol a pale rose-red ‘Colour, 100.000 Localities, &c.—This mineral was discovered by Dr Withering at Anglesark in Lancashire, in lead veins, which traverse the coal strata, and it is accompanied with heavy spar and blende. Uses.—Barytes acts as a strong poison on the animal economy. It has been long employed at Anglesark for the purpose of destroying rats. It has also been tried as a medicine in scrofula, hut seemingly with little effect ; and it ought to he had recoui'se to with extreme caution. 2. Species. Heavy Spar, or Sulphate of Barytes. Constituent Par ts. Klaproth, Lime, 35.5 Silica, 36.5 Boracic acid, 24. Water, 4. 100.0 This species has been divided into eight subspecies; earthy, compact, granulw, foliated, common, columnar, prismatic, and bolognian. Subspecies 1. Earthy Heavy Spar. Earthy Baroselenite, Kirwan, i. 138. Le Spath Pesant Terreux, Brochant, i. 617. 4 Exter. irt I. issiiica- Ex ter. CAar.—-Found massive j lustre scarcely glim- ition. mering, or dull j consists of earthy pai’ticles, which are slightly cohering j stains a little j feels meagre. Colour snow white, grayish, yellowish, or reddish white. Localities, &.c.—This a rare mineral. It has been found in Saxony, covering masses of heavy spar, and al¬ so in Derbyshire and Staffordshire in England. Subspecies 2. Compact Heavy Spar. Compacts Baroselenite, Kirw. i. 138. Baryte Sulfatce Compacts, Hauy, ii. 303. Id. Broch. i. 618. Exter. Char.—Found massive, sometimes in kidney- form or globular pieces, with cubical impressions 5 lustre glimmering, sometimes dull, and sometimes weakly shining y fracture coarse earthy, sometimes uneven ; fragments not very sharp-edged. Colour yellowish, grayish white, sometimes pale flesh red } opaque, or translucent at the edges j soft j not very brittle ; easily frangible 5 feels meagre. Localities, &c.—Found in mineral veins in Saxony, and in England ; in clay slate, in Savoy; and we have found it in sand stone in Northumberland. 207 four-sided prism, rectangular or oblique ; 3. A four- Barytic sided table, rectangular or oblique ; 4. A six-sided genus, prism ; 5. A six-sided table ; and, 6. A long eight- v-—y-—^ sided table. These forms are variously modified by truncations and bevelments, and they are differently grouped together ; the prisms cross one another $ the tables are attached by their lateral faces, and form glo¬ bular or kidney-shaped groups $ surfaces smooth, some¬ times rough and drusy. Lustre resplendent, shining, glimmering, or only dull : internal lustre shining or re¬ splendent, between pearly and resinous : fracture straight foliated 5 cleavage threefold ; fragments some¬ what rhomboidal. Colour commonly white, snow-white, milk-white, grayish, yellowish, or reddish ; in masses translucent y in crystals transparent or semitransparent y refraction double; soft 5 brittle. Spec. grav. 4.29 to 4.47, and 4-5- Chcm. Char.—Fusible before the blow-pipe into a solid white enamel, which being moistened, gives out the odour of sulphurated hydrogen. Does not effer¬ vesce with acids. Constituent Barts. MINERALOGY. Subspecies 3. Granular Heavy Spar. Exter. Char.—This also is found massive y lustre glimmering, nearly shining, and pearly 5 fracture foli¬ ated, or splintery y fragments blunt-edged. Colour snow-white, milk-white, yellowish, or red¬ dish •, translucent y soft y not very brittle j easily fran¬ gible. Spec. grav. 3.8. Constituent Parts. Barytes, Sulphuric acid, Silica, Klaproth. 60 3° 16 100 Withering. Bergmans Barytes, 67.2 84 Sulphuric acid, 32.8 13 Water, — 3 100.0 100 Localities, 8zc.-—This is a very common mineral,, and particularly in metallic veins that traverse primi¬ tive mountains. It accompanies ores of silver, copper, lead, and cobalt, as well as fluor spar, calcareous spar, and quartz. Subspecies 6. Columnar Heavy Spar. Le Spath Pesant en Barrcs, Broch. i. 631. Baryte Sulphates Bacillaire, Hauy, ii. 302. Localities, &o.—Found in mineral veins in Saxony, along with galena, and in-Siberia, accompanied by cop¬ per and silver ores. Subspecies 4. Foliated Heavy Spar. Exter. Char.—Found massive, and in kidney-shaped, globular, and cellular pieces, composed of four-sided tables, or lenses, with a drusy surface; lustre glimmer¬ ing or shining, between pearly and vitreous ; fracture curved foliated, sometimes splintery; fragments not very sharp-edged, sometimes wedge-shaped. Colour yellowish, reddish, or grayish white, some¬ times flesh or brownish red ; translucent; soft ; not very brittle ; easily frangible. Localities, &c.—Is not uncommon in mineral veins ; sometimes also in beds, in many countries. It is also found in Britain. Subspecies 5. Common Heavy Spar. Foliated Baroselenite, Kirw. i. 140. Broch. i. 624. Exter. Char.—This mineral is found in masses, or disseminated, and very often crystallized. Its princi¬ pal forms are, 1. A double four-sided pyramid; 2. A Exter. Char.—Found always crystallized : 1. In ob¬ lique four-sided prisms; 2. The same prism terminated by an acute bevelment; 3. The same prism terminated by a four-sided pyramid placed on the lateral edges; and, 4. A six-sided prism bevelled at the extremity. The crystals are acicular, and are grouped together in bun¬ dles; surface shining, or weakly shining ; internal lustre shining ; longitudinal fracture radiated ; cross fracture even. Fragments rhomboidal. Colour silvery, grayish or greenish white ; translu¬ cent ; soft, and brittle. Localities, &c.—Found in Saxony, and Derbyshire in England, accompanied by other varieties of heavy spar, quartz, and fluor spar. Subspecies 7. Prismatic Heavy Spar. Exter. Char.—Found massive, and frequently cry¬ stallized. The usual forms are, 1. An oblique four-si¬ ded prism, bevelled at the extremities; 2. An oblique four-sided prism, terminated by a four-sided pyramid placed on the lateral edges ; 3. An elongated octahe¬ dron; and, 4. A six-sided prism. Lustre shining or re¬ splendent, between resinous and pearly; fracture folia¬ ted ; cleavage threefold. Colour 208 Strontian genus. mineralogy. Colour yellowish, greenish, or pearl gray, sometimes pale blue, and rarely flesh red ; translucent ^ when cry¬ stallized, transparent j soft, and not very brittle j very easily frangible. .... Localities, &c.—‘■Sometimes found in mineral veins, as in Saxony. Constituent Parts. Klaproth. Strontites, 69.5 Carbonic acid, 30. Water, .5 Pelletier. 62 3° fi- ' Subspecies 8. Bolognian Heavy Spar. Le Spat/i de Bologne, Brochant, i. 633. Striated or fibrous heavy spar, Kirwan, i. 141. Baryte sulfatee radiee, Hauy, ii. 302. Exter. Char.—This is found in rounded pieces; ex¬ ternal surface uneven, dull, or glimmering j internal lustre shining, or weakly shining, between adamantine and pearly •, fracture radiated, parallel, diverging, or fibrous, sometimes foliated ; fragments splintery, some¬ times rhomboidal. Colour, smoke or yellowish gray 5 translucent, soft, very brittle, and easily frangible. Chem. Char.—This mineral has been long known by its property of shining in the dark, after being heated. Other heavy spars, indeed, have a similar pro¬ perty. Constituent Parts. Arvidson. Sulphate of barytes, 62. Silica, 15^ Alumina, *4*75 Gypsum, 6. Oxide of iron, .25 Water, 2. 100.00 Localities, &c.—This mineral is found at Monte Paterno near Bologna in Italy, in rounded masses, which have an uneven surface : they are imbedded in an argillaceous or marly rock, which is a kind of amyg¬ daloid, and from which they are detached by the action of the waters. 100.0 100 Localities, &c.—This mineral has been hitherto found only at Strontian in Scotland, in a lead vein which traverses a gneiss rock. It is said also to have been found at Leadhills. . 2. Species. Celestine, Sulphate of Strontites. La Celestine, Brochant, i. 640. Strontiane sulfatee, Hauy, ii 313. Essen. Char.—Divisible into a rhomboidal prism, with angles of about 105° and 7 50; gives a light red colour to the blue part of the flame produced by the blow-pipe. Exter. Char.—Primitive form of its crystals a rect¬ angular prism, whose bases are rhombs } integrant mole¬ cule a triangular prism with square bases. The forms under which it generally appears are four or six-sided prisms, which are terminated by a two-sided bevelment, a four-sided, or an eight-sided pyramid. This species has been divided into two subspecies : 1. fibrous j and, 2. foliated. Subspecies 1. Fibrous Celestine. Exter. Char.—Found massive or crystallized 5 lustre of the longitudinal fracture shining 5 that of the cross fracture, weakly shining between pearly and resinous. Longitudinal fracture foliated j cross fracture fibrous, curved j fragments splintery j rather blunt-edged. Colour indigo blue, bluish gray, and sometimes with whitish bands, or with yellowish brown spots 5 translu¬ cent j soft, and easily frangible. Spec. grav. 3.83. Constituent Parts. Klaproth. VIII. STRONTIAN Genus. 1. Species. Strontites, Carbonate. La Strontianitc, Brochant, i, 637. Id. Kirw. i. 332. Strontiane Carbonatee, Hauy, ii. 327. Essen. Char.—Soluble in nitric acid with efferves¬ cence j paper dipped in the solution, and dried, burns with a purple flame. Exter. Char.—Found massive, and sometimes cry¬ stallized in needles, which are grouped together j form of the crystals a regular six-sided prism j lustre weak¬ ly shining, or only glimmering j internal lustre shin¬ ing, and weakly shining, between resinous and pearly j fracture radiated, straight, diverging, or fibrous ; cross fracture fine grained, uneven, or splintery 5 fragments wedge-shaped, or sharp-edged. Colour asparagus green, greenish, whitish, or yel¬ lowish gray ; translucent; semihard, brittle and easily frangible j feels a little greasy. Spec. grav. 3.4 to 3-67- Chem. Char.—Before the blow-pipe whitens without fusion, and afterwards exposed to the air, falls to powder. Strontites, 58 Sulphuric acid and oxide of iron, 42 100 Localities, &c.—Has been found in Pennsylvania in America, and near Toul in France. Subspecies 2. Foliated Celestine. Extern Char.—This is also found massive and crystal¬ lized j lustre weakly shining, or shining j that of the crystals resplendent; fracture foliated, straight, or radi¬ ated •, cleavage threefold. Colour milk-white, grayish, and bluish-white : semi¬ transparent, or translucent j semi-hard j very easily fran¬ gible. The following are the constituent parts of a variety of sulphate of strontites, which is found at Mont Mar- tre near Paris. Sulphate of strontites, 91.42 Carbonate of lime, 8.33 * pauqu*- Oxide of iron, .25 lin,Jonr‘ de i 00.00* _ s3. Localities f |r. I. MINER . I'ca- Localities, &C.—This variety is found in great abun- n dance near Bristol in England, where the sulphate of • ' strontites was first discovered by Mr Clayfield. It has been since found in Sicily, where it is accompanied *,rith fibrous gypsum and native sulphur. SECOND CLASS. SALTS. I. Genus. SULPHATES. 1. Species. Native Vitriol. Mixed vitriol, or sulphate of iron, copper and zinc, Kirwan, ii. 24. Vitriol Natif, Brochant, ii. 2. E.vter. Char.—This mineral is found massive or dis¬ seminated, and also in a stalactitical, cylindrical, and capillary form ; internal lustre shining, or weakly shin¬ ing, between silky and vitreous ; external surface rough and* uneven ; fracture usually fibrous, sometimes foliat¬ ed. Colour grayish, or yellowish white, sometimes differ¬ ent shades of sky blue ; the colour varies by exposure to the air. Soft 5 semi-transparent or translucent 5 taste sour and astringent. Chon. Char.—’1 hese are different, according to the proportions of the constituent parts. Before the blow¬ pipe, sulphurated hydrogen gas is given out; the iron is detected by giving a black colour to the solution of nut galls *, the copper, by immersing a plate of iron j and the zinc, by a white efflorescence, which appears when the native salt is exposed to the air. This substance is a mixed salt, composed of the sul¬ phates of iron, zinc and copper, in variable propor¬ tions, so that its appearance and characters must also be Variable. Localities, &c.—Native vitriol is not uncommon in mountains of clay slate which contain metallic ores, and particularly those of copper and iron pyrites, and blende; by the decomposition of which it’is formed. It is found in Bohemia, Saxony, and Hungary, as well as in the mines of Britain, where such metallic ores abound. 1 he native sulphate of iron is common in coal mines which contain iron pyrites, as in many of the coal mines of Britain. I he substance is very abundant in the earl of Glasgow’s coal mines near Paisley, where the manufacture of copperas, by purifying and crystallizing the native salt, has been long car¬ ried on. Uses.—1 he mixed substance, native vitriol, can only e,nP'°ye(i to any useful purpose, by obtaining the dmerent salts in a separate form. The uses of these salts are well known in various arts, but particularly in dyeing, and some of them in medicine. 2. Species. Native Alum. Ahim, Kirwan, ii. 13. VAlun Natif, Brochant, ii. 6. Alumvne Sulfatee alkaline, Hauy, ii. 387, 388. Lxter. Char.—Native alum is usually found in small capillary crystals, sometimes adhering to other minerals, and veiy rarely in stalactitical masses. The form of . ie crystal of alum is the regular octahedron, which is usually obtained artificially. Externally it is dull, or slightly glimmering, but internally shining, with a VOL. XIV. Part I. ' f A L O G Y. silky or vitreous lustre, fracture fibrous; very soft; taste astringent. Chem. Char.—Before the blow-pipe melts easily in its water of crystallization, then froths up, and becomes a white spongy mass. Alum is a triple salt, a sulphate of alumina and pot¬ ash. It rarely happens that all the three ingredients exist together in nature. The potash is usually added during the preparation of artificial alum. According to the examination of native alum by Klaproth, from the alum cavern at Cape Miseno near Naples, it appears that from 1000 lbs. of the material furnished by nature, 470 lbs. may be obtained, having the requisite quantity of potash ; and by an addition of potash to promote the crystallization, 290 lbs. more may be obtained. Analyt. Ess. i. 268. The following is the analysis of the aluminous schistusfrom Freyenwaldr by the same chemist. Alumina, IS-2S Oxide of iron, 7-5° Potash, Sulphuric acid and water of crystallization, 77. IOO.OO* * Analyt. Localities, &c.—Native alum is found in those pla¬ ces where the aluminous stones, already described, a- bound, as in the neighbourhood of volcanoes, and in Coal mines. An extensive alum manufactory has been carried on for several years with great skill and success, at Lord Glasgow’s coal work near Paisley, mentioned above. The materials are obtained from the rubbish in the old wastes, which consists of the aluminous schistus from the roof and pavement of the coal. These mines also abound with iron pyrites ; and from the decompo¬ sition of all these substances the native vitriol and na¬ tive alum are obtained. Uses.—The uses of alum in various arts a*e too well known to require any enumeration. 3. Species. Mountain Butter. La Bear re de Montague, Broch. ii. 10. Exter. U/iar.—Found massive; internal lustre strong¬ ly glimmering, waxy; fracture foliated; fragments blunt-edged. Colour grayish white, sulphur yellow, or yellowish brown ; translucent at the edges ; feels greasy; taste astringent. Localities, &c.— This species is found in similar situ¬ ations with the former. In its native repository it is nearly as soft as butter, and has something of the ap¬ pearance, from which it has its name. Perhaps it ought to be considered merely as a variety of the former. The same remark may be applied to another variety called plumose alum. 4. Species. Capillary Salt. Sulphate of Magnesia. Le Sel Capillaire, Broch. ii. 8. Haar Salz, or Hair Salt, of the Germans. Exter. Char.—This salt is always found in fine capil¬ lary crystals, so closely united together as to form a compact mass ; lustre shining, or weakly shining, silky ; fracture fibrous. D d Colouf ?\/f T M V. R A L n G Y, Colour white, sometimes greenish, grayish, or yellow¬ ish 5 translucent, friable 5 taste astringent. Constituent Parts.—This salt was supposed to be a plumose or native alum j but it appears from the analysis of Klaproth, to be a sulphate of magnesia, with a small proportion of iron. We have examined a similar ca¬ pillary salt from the coal mines near Paisley, which also appeared to be a sulphate of magnesia, but with a 'rreater proportion of sulphate of non. ° Localities, &c.—This native salt is found in similar situations with the former species. 5. Species. Native Epsom Salt, or Sulphate of Magnesia. Le Sel amerNatif Broch. ii. 1 t . Epsom Salt, Kir. ii. 12. Exter. Char.—The characters already given of the former species are equally applicable to this, except¬ ing that it is said to exist sometimes in an earthy form, when it has a dull appearance. Localities, &c.—Found in a state of efflorescence on limestone, porphyry, sandstones *, and it exists in solu¬ tion in many mineral wTaters, as in that of Epsom in England, from which it has its name. This salt also constitutes part of the efflorescence which is observed on walls built with lime. 6. Species. Native Glauber Salt, or Sulphate of Soda. Glauber Salt, Kirw. ii. 9. Le Sel de Glauber Nat if, Broch. ii. 14. Exter. Char.—This salt is sometimes found massive or earthy,rarelystalactitical or crystallized. The crystals are often acicular, or in irregular, six-sided prisms, ter¬ minated by a three-sided pyramid, placed on the lateral edges or sides. Lustre shining, vitreous j but exposed to the air becomes dull. Fracture uneven 5 that of the crystals conchoidal. Fragments blunt-edged. Colour yellowish or grayish white ; opaque or trans¬ parent brittle taste cooling or bitter. localities, &c.—This salt is usually found in the neighbourhood of mineral springs which hold common salt in solution, from the decomposition of which, and the combination of its base with sulphuric acid, it is ob¬ tained. It is not unfrequent on the banks of salt lakes, and in a state of efflorescence on sandstone, marl, some¬ times on the surface of the ground, and sometimes on walls built with stone and mortar. It is found in most countries in the world. II. Genus. NITRATES. Parti J; lucent $ soft; easily frangible or friable j taste saline, ciassiftC; cooling. tion. IP Constituent Parts. Klaproth. Nitrate of potash, 42>55 Muriate of potash, .20 Sulphate of lime, 25-45 Carbonate of lime, 30.40 Loss, 1.40 j 00.00* *AmlJ Ess. i,. ■ I Exter. Char. See.—Native nitre is found in Italy near Molfetta, in Naples, from which that analyzed by Klaproth was obtained, and which is disposed in small beds, or more rarely in veins, on limestone. Na¬ tive nitre is also not uncommon in Hungary, Spain, France, and Peru, in which latter country, and in the East Indies, where it is very abundant, it is found ef¬ florescent on the surface of the ground at certain seasons of the year. Uses.—The uses of nitre for some economical pur¬ poses, in various arts, in medicine, but particularly ia the manufacture of gunpowder, are well known. III. Genus. MURIATES. 1. Species. Rock Salt. Common Salt, Sal Gem, Kirw. ii. 31. Le Sel de Cui¬ sine, Broch. ii. 20. Soude Muriatee, Hauy, ii. 356. Essen. Char.—Soluble in water, and divisible into cubes. This species is divided into two subspecies:. 1. folia¬ ted, and 2. fibrous rock salt. Subspecies 1. Foliated Rock Salt. Le Sel Gemme Lamelleux, Broch. ii. 21. Lamellar Sal Gem, Kirw. ii. 32. Soude Muriatee, Amorphe, Hauy, ii. 359. Exter. Char.—Usually found massive in considerable beds, sometimes disseminated in large masses, or kidney- form, stalactitical, or crystallized in perfect cubes ; sur¬ face of the crystals smooth 5 lustre shining, vitreous; fracture foliated ; cleavage threefold and rectangular *, fragments cubic. Colour grayish, yellowish, or reddish white, flesh or brownish red j transparent or translucent 5 soft; streak grayish white ; taste saline. Chem. Char.—This salt decrepitates violently when thrown on burning coals. Constituent Parts. 1. Species. Native Nitre, or Nitrate of Potash. Nitre, Kirw. ii. 25. Le Nitre Natif Broch. ii. 17. Po- tasse Nitratee, Hauy, ii. 346. Saltpetre. Essen. Char.—Does not deliquesce, and detonates with a combustible body. Exter. Char.—This salt is commonly found superficial, i,n acicular crystals, rarely massive, and more rarely cry¬ stallized in six-sided prisms-, lustre shining, vitreous j fracture conchoidal y fragments sharp-edged. Colour snow white, grayish or yellowish white 3 trans- Kirwan. Bergman. Soda, 35 42 Muriatic acid, 40 52 Water, 25 6 100 100 The above are the analyses of pure salt; for as it is found in nature, it contains several other ingredients. Localities, &c.—Foliated rock salt constitutes a pe¬ culiar kind of stratiform mountain, in which it usu¬ ally ft I. MINER silica- a^ernates of clay, which are more or pn less penetrated with salt. It is also accompanied with y—- gypsum, sandstone, limestone. It is sometimes also found in veins. Rock salt is found in most countries of the world j the most celebrated mines are those of Wiliezka, which have been wrought for 500 years. There are mines of this mineral in Poland, Silesia, and in Bavaria and Si¬ beria j at Cordova in Spain it constitutes an entire mountain, four or five hundred feet high. Rock salt is also found in abundance in Cheshire in England. It is found also in Africa, Asia, as well as in North and South America. Subspecies 2. Fibrous Rock Salt. Fibrous Sal Gem, Kirw. ii. 32. Le Sel Gemme Fi- breux, Broch. ii. 25. Soucle Muriatee Fibreuse, Hauy, ii. 379. Exter. Char.—This variety is found massive, in small wedge-shaped veins j lustre glimmering, rarely weakly shining j fracture fibrous, curved parallel or divergent} fragments wedge-shaped, with sharp edges. Colour grayish white, yellowish or pearl gray, la¬ vender blue, violet blue, or flesh red } varies between translucent and semitransparent. The other characters of fibrous rock salt correspond with those of the pre¬ ceding subspecies, and it is found in similar situations accompanying it. 2. Species. Sea Salt. Ihis salt can perhaps scarcely be considered as a se¬ parate species. It is found on the shores of the ocean, or of salt lakes during the dry seasons of the year, in consequence of the evaporation and diminution of the water which holds it in solution. Uses.— file various uses of salt in domestic economy and many of the arts are well known. 3. Species. Native Sal Ammoniac. Sal Ammoniac, Kirw. ii. 33. Le Sel Ammoniac ~Na- tif, Broch. ii. 27* Ammoniaque Muriate'e, Hauy, ii. 380. ^ Essen. Char.—Entirely volatile by the application of Exter. Char.—Most commonly found in superficial layers, or efflorescent} sometimes also massive or sta- lactitical, and rarely crystallized. Primitive form of ib crystals a regular octahedron ; integrant molecule a regular tetrahedron. rIhe crystals are described to be in t ic form of cubes, six-sided pyramids, and dodecahedral} ustre shining, often only glimmering or dull and vitre- ousl Fracture even 5 fragments sharp-edged. Colour white, grayish, or yellowish} soft, and often triable } taste saline, pungent, and bitter. Chem, Char.—Very soluble in water, producing a considerable degiee of cold ; rubbed with lime, gives a pungent odour of ammonia. Constituent Parts. Klaproth. Muriate of ammonia, Sulphate of ammonia, A L O G Y. Localities, &c,——T. his salt is a voicanic production, and found deposited in the cavities-of lava, as on Ve- suvius and iEtna, and in the Lipari islands. It is also met with in Iceland, 111 Persia, and different places of Asia. The substance analyzed by Klaproth was from Paitary. This salt has also been discovered in the neighbourhood of coal mines in Britain, which have been accidentally on fire. Sal ammoniac from Egypt may be considered rather as an artificial production. IV. Genus. CARBONATES. I. Species. Native Soda, ot Carbonate of Soda. Natron, Kirw. ii. 6. VAlkali Mineral, Broch. ii. 30. Soude Carbonatee, Hauy, ii. 373. . Essen. C/^or.—Soluble in water, and effervesces with nitric acid. Exter. Char.—Found in small particles, which are usually in the state of pow'der} is dull and meagre to the touch. Colour grayish white, or yellowish gray} taste sharp alkaline. 1 them. Char.—A ery fusible before the blow-pipe} the solution renders vegetable blues green. 'Ihe following are the constituent parts of Egyptian natron or soda, analysed by Klaproth. 1 1 Carbonate of soda, Sulphate of soda, Muriate of soda, Water, 32.6 20.8 I5* 31.6 100.0 Localities, &c.—-Native soda is found on the surface of the soil, or on the borders of lakes which evaporate during the summer, in Egypt, where it has been long collected, and known under the name of natron. In the neighbourhood of Debreczin in Hungary, it is found efflorescent on a heathy soil} in Bohemia, in decom¬ posed gneiss rock, where it is annually collected in con¬ siderable quantity in the spring of the year. Natron is also found near Naples, in Persia, Bengal, and China. It exists also in solution in many mineral waters. Uses.—This salt is very extensively employed in many arts. Another variety of native soda has been described. This is in the form of radiated masses, which are com¬ posed of acicular crystals. It seems to be a purer car¬ bonate of soda. I he following are the constituent parts according to the analysis of Klaproth. Soda, Carbonic acid, W ater, Sulphate of soda, 37- 38. 22.5 2-5 100.0 100.0 2. Species. Native Magnesia, or Carbonate of Magnesia. \fvXty Pure carbonate of magnesia, discovered by Hr Mitchell 5 and another which contains an admixture D d 2 of Salts. 212 Salts. of silica discovered by Giobert, has been already^de¬ scribed under the magnesian genus, species I. 'vvluch jVI INK 1^ A LOGY. Constituent Paj-ts. Westrumb. Part fJ Classing lion. V. Genus. BORATES. i. Species. Borax. Id. Kirw. ii. 37- Borax Notify Broch. ii. 33. Soude Boratec, Hauy, ii. 366. Essen. Char.—Taste sweetish j fusible with consider¬ able intumescence into a vitreous globule. Extcr. Char.—This salt is found massive and disse¬ minated, but most frequently crystallized ; the forms are a six-sided prism with the two opposite taces broader j the same prism having its lateral edges truncated, or having its too narrow terminal edges truncated ; the crystals are usually imbedded in an earthy mass ; sur¬ face a little rough, sometimes smooth, and usually co¬ vered with a white earthy crust 5 lustre shining, waxy j fracture foliated. ... Colour grayish white, yellowish or greenish ; semi¬ transparent, or only translucent; refraction double ; soft j brittle •, greasy to’the feel. Spec. grav. 1.740. _ _ Constituent Parts.—When borax is purified, it is a compound of soda and boracic acid} but in its na¬ tive state it is always contaminated with earthy mat- ters. Localities, &c.—Borax is brought from Persia and Thibet. According to some travellers, it is got from the waters of a lake by evaporation in the open air j but according to others it is ready formed on the borders of the lake, where common salt is also col- , lectcd* Uses.—Borax is still farther purified after it is brought to Europe, for the purposes of employing it in the arts, particularly as a flux in metallurgical opera¬ tions. 2. Species. Boracite, or Borate of Magnesia. Boraeitc, Kirw. i. 1^2. Id. Brochant, i. 389. Magnesia, Lime, Silica, Alumina, Oxide of iron, Boracic acid, Loss, '3-S 11. 2. 1. •7 68. 3-8 100.0 Phys. Char.— Boracite has the property of becoming electric by heat, and exhibiting both kinds oi electri¬ city by opposite points. These electric poles are the extremities of the axes of the cube, each axis giving out at one extremity positive, and at the other negative electricity. Localities, &c.—This mineral has been only found at Lunebourg in Lower Saxony, in a mountain compo¬ sed almost entirely of foliated gypsum, in which the de¬ tached crystals are imbedded. VI. Genus. ELUATES. Species. Cryolite, or Fluate of Soda and Alumina. Id. Brochant, ii. 505. Alumine Fluate'e Alkaline, Hauy, ii. 398. Exter. Char—Found massive $ lustre shining, vitre¬ ous 5 fracture foliated j fragments cubical. Colour grayish white translucent; immersed in wa¬ ter, transparent; semihard ; streak snow-white. Spec, grav. 2.94. Chem. Char.—Melts in the flame of a candle, and from its easy fusibility it derives its name. It then be¬ comes hard, and is changed into a slag, which is some¬ what elastic. Soluble with effervescence in sulphuric acid, and gives out white vapours that corrode glass. Constituent Parts. Exter. Char.—Always found crystallized .. 1. In cubes, having the edges and four of the angles trunca¬ ted 5 2. The cube, having all the edges and angles truncated. When these truncations are increased on the edges, a dodecahedron is nearly formed, or when they increase on the angles, the resulting form is an oc¬ tahedron. Surface of the crystals smooth, sometimes rough } lustre shining or resplendent •, internal lustre shining, resinous 5 fracture conchoidalj fragments shaip- edged. Colour ash or yellowish gray, grayish or greenish white ; semitransparent or translucent, oftener opaque semihard y rather easily frangible. Spec. grav. 2.56. Chem Char.—Melts before the blow-pipe, froths up, and yields a yellowish enamel, on which small rough points appear, and are thrown off like sparks by conti¬ nuing the heat. Klaproth. Soda, 36. Alumina, 23.5 Fluoric acid and water, 40.5 Vauquelin. 32 21 47 100.0 100 Localities, &c.—Cryolite was brought to Copenha¬ gen from Greenland, but nothing is known of its re¬ pository (b). THIRD CLASS. COMBUSTIBLES. I. Genus. SULPHUR. 1. Species. Native Sulphur. Id. Kirwan, ii. 69. Le Sotifre Fiatif, Brochant, ii. 37; This species is divided into two subspecies } 1. Com¬ mon ; 2. Volcanic native sulphur. Subspecies (b) Boracite and cryolite do not certainly possess all the characters that entitle them to a place among the salts; but as magnesia is the predominant base of. the one and soda of the other, it was thought better to m ro~ duce them here than to multiply divisions. it I. MINER issifiea- Subspecies i. Common Native Sulphur. Ion. '••v 1 Essen. Chav.—The sulphurous odour when heated j colour yellow. Extcr. Char.—Sulphur is found massive,disseminated in superficial layers, or crystallized. Primitive form of its crystals is an octahedron,’whose sides are scalene tri¬ angles 5 the integrant molecule is an irregular tetrahe¬ dron. The usual forms of the crystals are, i. That of the primitive form, in which two four-sided oblique- angled pyramids arc joined base to base, of which the common base is a rhomb, whose two diagonals are as 5 to 4 ; 2. The same form having its summits truncat¬ ed ; 3. The first form having its summit surmounted by an obtuse fbur-sided aeumination, set on the lateral faces j 4. Or, having the common case truncated; or, 5. Having its obtuse lateral edges truncated j or, 6. Having the obtuse angles of the common base truncat- ed.v The crystals are of various sizes, most frequently grouped: surface smooth •, lustre resplendent j internal lustre shining, or weakly shining, between resinous and adamantine $ fracture fine grained, uneven, sometimes conchoidal or splintery ; fragments sharp-edged. Colour yellow, greenish, or grayish yellow j translu¬ cent or semitransparent; refraction double ; soft; brit¬ tle, and very easily frangible j gives out by rubbing a sulphureous smell. Spec. grav. 19 9 to 2.03. Chon. Char.—Burns with a peculiar blue flame, and gives out a pungent odour, which is well known. Native sulphur is not always pure ; it is often conta¬ minated with earthy matters. Phys. Char.—Sulphur becomes electric by friction, and its electricity is negative. Localities, &c.—Native sulphur is most commonly found in stratiform mountains, chiefly in those of gyp¬ sum, marl, and compact limestone, and there it exists in the form of nodules. Found also, but rarely, and in. small quantity, in the veins of primitive moun¬ tains. Sulphur is found in many countries of the world, as in Poland, Hungary, Switzerland, Spain, and Sicily, where the finest crystals yet known are found. Subspecies 2. Native Volcanic Sulphur. Extcr. Char.—Found massive, in rounded pieces, stalactitical, cellular, or in thin sublimed layers, some¬ times also crystallized in confused groups j internal lustre weakly shining or shining j fracture uneven } fragments blunt-edged. Colour the same as the former, but inclining sometimes a little towards gray •, translucent ; in other characters it resembles the preceding. Localities, &c.—As its name imports, this variety is found near volcanoes, where it is sublimed among the lava. The sulphur of iEtna and Vesuvius chiefly, and also that of Iceland, and of some of the islands in the West Indies, is collected, and forms a very important article in commerce. Uses—Sulphur is one of the most valuable substances in various arts. It is employed in the bleaching of woollen stufts and silks ; it forms an essential ingredient m gunpowder, and it is the base of sulphureous and sul¬ phuric acid, which are so extensively employed in tan¬ ning, hat-making, dyeing, and other arts and manu¬ factures. 3 A L O G Y. II. BITUMINOUS Genus. I. Species. Petroleum, or Mineral Oil. Le Naphte, and L'fL/nle Minerale Commune, Broch. i*. 59’ and 60. Naphtha and Pctrole, Kirwan, ii. 42 and 43. Bitume Liquide Prune, ou Noiratrc, Many, iii. 312. Lxtcr. Char.—Found fluid and somewhat viscid. Colour blackish or reddish brown j almost opaque j feels very greasy.j exhales a strong bituminous odour : taste pungent, acid. Spec. grav. 0.708 to 0.854. Chem. Char.—Burns easily with a dense smoke, and leaves some earthy residue. When exposed to the air it becomes thicker and less fluid. its constituent parts are carbone, hydrogen, and a small portion of oxygen. . Localities, &c.—Petroleum is generally found in the vicinity of coal, rising to the surface of the water which flows from coal strata. It is not uncommon in different parts of the world. It is found in Lancashire in Eng* land,.and at St Catharine’s well near Libberton, in the vicinity of Edinburgh. Naptha, which is considered merely as a purer kind of mineral oil, is found in. considerable abundance in different parts of Persia, on the shores of the Caspian sea, in Calabria, Sicily, and America. In 1802, a spi ing of naphtha of a topaz yellow colour, burning easily, and leaving little residue, with a specific gravity of 0.83, was discovered in the state of Parma in Italy, and afforded such a quantity as to be sufficient to illu¬ minate the streets of Genoa. Uses.—Naphtha has been sometimes employed in the composition of varnish, in that of fire-works, for the purpose of heating rooms, when it is mixed with a smaU quantity of earth ; and in Persia and other countries it is burnt in lamps as a substitute for oil. Formerlv it was employed in medicine as a vermifuge. 2. Species. Mineral Pitch. This is divided into three subspecies j 1. elastic; 2. earthy j and, 3. slaggy. Subspecies 1. Elastic Mineral Pitch. Mineral Caoutchouc, Kirw. ii. 48. Jxi Poiv Minerale Elastique, Broch. ii. 64. Bitume Elastique, Hauy, iii- 313. Exter. Chur.—Found in masses of different sizes, dis¬ seminated, sometimes superficial, or stalactitical; lustre dull, rarely glimmering ; internal lustre shining, resin¬ ous. Colour brownish black, hair-brown, often veined yel¬ low translucent at the edges 5 soft consistence like elastic gum, and also elastic. It gives odt the smell of leather. Spec. gfav. 0.902 to 1.23. I^oculities, &c.—Ibis mineral was discovered in 1785 in the mine of Odin in Derbyshire in England, where it is accompanied with galena, calcareous spar’ heavy spar, fluor spar, and blende. * rhis substance effaces the marks of black lead on paper, like elastic gum \ but stains the paper. Subspecies 213 Combus¬ tibles. < i 214 Combus- tiblrs Subspecies 2. ^EARTHY MINERAL PITCH. Semicompact Mineral Pitch, or Maltha, K iivv. ii. 46. La Pout Minerals Terreuse, Br ch. 11. 65. Exter. Char.—Found massive •, internally dull j frac¬ ture earthy, sometimes uneven •, fragments blunt-edge . Colour blackish brown, sometimes clove brown j streak shining, and darker coloured j very soft j feels greasy \ smell bituminous. Chem. Char.—Burns with much flame and smoke; exhales a strong odour, and leaves carbonaceous and earthy matter. .... r xr r Localities, &c.—Found in the principality of JNem- 'chatel in Switzerland. mineralogy. Patt Colour yellowish white, or straw-yellow J slightly classifti translucent; soft; easily frangible ; by friction, or re- ducing to powder, it gives out an agreeable odour. Spec. grav. 1.07 to 1.08. Chem. Char.—Burns with a yellow flame, without melting, giving out at the same time a peculiar odour; leaves very little residue. Subspecies 3 Slaggy Mineral Pitch. Compact Mineral Pitch, Kirw. ii. 46. La Poix Minerals Scoriacee, Broch. ii. 66. Bitumc Solicfe, Hauy 111. 313. Asphaltum, or Jews Pitch, of others. Exter. Char.—Found massive and disseminated, su¬ perficial or stalactitical ; lustre resplendent, resinous) fracture conchoidal ; fragments sharp-edged. Colour perfectly black, sometimes brownish black; Opaque, rarely translucent at the edges ; lustre remains in the streak ; soft; feels greasy ; by rubbing gives out a bituminous odour. Spec. grav. 1.07 to 1.6. Localities, &c.—This variety frequently accom¬ panies the preceding. It is found at Morsfeld in t le Palatinate, at Neufchatel in Switzerland It isTound floating on the surface of the lake Asphaltum in Judea, from which it derives its name of Jews pitch. It is there collected by the inhabitants of the country as an object of commerce, and at the same time, it is said to diminish the quantity of noxious vapours which it ex¬ hales—so noxious that birds flying over it drop down dead, whence it has the name of Dead sea. Ibis va¬ riety of mineral pitch is found in other places, some¬ times connected with coal and limestone strata, and sometimes with mineral veins. But the island of 11- nidad furnishes the greatest quantity of this substance. In that island there is a pitch lake of about four miles in circumference ; but it appears from the information of Mr Spon, in a letter to Mr Tobin of Bristol, by whom this information was communicated, along with a number of specimens to Mr Hatchett, that the sub¬ stance formerly supposed to be mineral pitch, is nothing more than a porous stone impregnated with that sub¬ stance ; so that what was supposed to be an immense lake of mineral pitch or asphaltum, is only the stone of the country impregnated with bitumen. Mr Hatchett thinks this stone may be arranged in the argillaceous tun. genus*. Trans, viii. 3. Species* Amber. Subspecies 2. Yellow Amber. Extcr. Char.—Also found in rounded pieces of vari¬ ous sizes ; surface rough and uneven ; dull, sometimes glimmering; internal lustre resplendent, resinous; some¬ times transparent. In its other external and chemical characters, it resembles the preceding. Phys. Char.—Amber becomes strongly electric by friction, a property known to the ancients. 110m the Greek and Latin word electrnm, the term electricity is derived. . . f . Constituent Parts.—Amber is composed of a large proportion of oil, and of a peculiar acid, the succinic, which is obtained by distillation. . ... Localities, &.c.—Amber is found in the vicinity of bituminous wood, but most commonly in the sand on the shores of the ocean, and chiefly on the shores of the Baltic. It is found also in Sweden, 1 ranee, Italy, and on the east coast of England. Amber frequently co*}~ tains small parts of vegetables, and entire insects. Of the origin of this substance nothing certain is yet known. Uses. The uses of amber for ornamental purposes, are well known. In this country it was formally in higher estimation than at present. It still forms an im¬ portant article of commerce in eastern countries. Species. Mellite, or Honey Stone. Id. Hauy, iii. 335. La Pierre de Mief, Broch. ii. 73. Mcllilite, Kirw. ii. 68. Exter. Char.—Found usually crystallized, in double four-sided pyramids ; the surface smooth and shining; internal lustre resplendent, between resinous and vitre¬ ous ; fracture conchoidal ; fragments rather sharp- edged. # . , , Colour honey yellow, sometimes hyacinth red ; trans¬ parent or translucent; refraction double ; soft; brittle. Spec grav. 1. 58 to 1.66. Chem. Char.—Becomes white before the blow-pipe, and is reduced to ashes, without flame. Constituent Parts. Alumina, Mellitic acid, Water, Klaproth. 16 46 38 IOO Id. Kirw. ii. 65. Le Succin, Broch. ii- 69. Id. Hauy, ii. 327. This is divided into two subspecies. Subspecies 1. White Amber. Exter. Char.—Found massive, and in rounded pieces; •lustre shining or weakly shining ; fracture conchoidal; fragments sharp-edged. 4 Phys. Char.’—Becomes slightly electric by friction. Localities, &.c—This mineral is hitherto rare. It has been found only in Switzerland, accompanied with mineral pitch, and at Arten in Thuringia, attach¬ ed to bituminous wood. 3. Species. Brown Coal. This is divided into five subspecies; n common; 2. bituminous wood ; 3. earthy coal; 4. alum eaiti; c. moor coal. „ , . 0 Subspecies ,rt I. mine e a l o g y. 215 issifica-r ■ion- Subspecies 1. Common Brown Coal. La Houille Brune, Broch. ii. 47. Exter. Char.—Found massive; lustre shining, resin¬ ous ; fracture conchoidal; longitudinal fracture slaty ; fragments rather sharp-edged. Colour brownish black, or blackish brown ; streak shining : soft ; not very brittle. Chem. Char.—Burns with a blue-coloured flame, and gives out an odour like that of bituminous wood. •'ll/, m- A- 99- Constituent Parts. Hatchett*. Grains. Water which soon came over acid, and aftenvards turbid by the mixture of bitumen, 60 Thick brown, oily bitumen, 21 Charcoal, 90 Hydrogen, carbonated hydrogen, and carbonic acid gases, 29 and from certain varieties which contain pyrites, alum Combus- is extracted. tibles. Subspecies 4. Alum Earth. This has been already described under the name of aluminous schistus, in the argillaceous genus. Subspecies 5. Moor Coal. La Houille Limonei/se, Brochant, ii. 48. Exter. Char.—This variety is found massive, and in extensive beds ; internally glimmering ; cross fracture even, sometimes flat conchoidal ; longitudinal fracture slaty ; fragments trapezoidal or rhomboidal. Colour blackish brown, and brownish black ; streak- shining ; soft,-very easily frangible. Localities, &c.—-Moor coal is abundant in Bohemia ; it is found also in Transylvania, and chiefly among sand¬ stone, limestone, and trap rocks. It seems to approach nearly to earth coal. 200 The above is the analysis of 200 grains of Bovey coal by distillation. Localities, &c.—This variety is not uncommon in many places of Germany. It is found also at Bovey near Exeter in England, from which it is called Bovey coal. Subspecies 2. Bituminous Wood. Carbonated Wood, Kirw. ii. 60. Le Bois Bitumineux, Broch. ii. 44. Exter. Char.—Has a ligneous form, and even some*- times the appearance of branches and roots of trees; glimmering in the principal fracture, in the cross frac¬ ture, eoncheidal ; fragments splintery, wedge-shaped, or tabular. Colour commonly light blackish brown, sometimes wood brown ; opaque streak shining; soft, and easily frangible. Chem. Char.—Burns with a bright flame, and gives out a sweetish, bituminous smell. Localities, &c.—This variety is found in the same places with the other varieties of coal, and also in places where the more common kinds of coal are rare, or in small quantity, as in the island of Iceland, where it is known by the name of surturbrand; and in the island of Skye in Scotland. It is found also in the coal fields round Edinburgh, and also at Bovey near. Exeter, and in various places on the continent. Subspecies 3. Earthy Coal. Bois Bitumineux Tierreux, Brochant, ii. 43. Exter. Char—The consistence of this variety is in¬ termediate between solid and friable; dull, rarely glimmering ; fracture earthy. Colour blackish brown, or liver brown ; streak shin¬ ing ; stains ; very soft. Localities, &c.—-This is found in Saxony, Bohemia, France, and particularly iii the vicinity of Cologne, where it is known by the name of umber or Cologne earth, which is employed in the fabrication of colours; 6. Species. Black Goal. This species is divided into six subspecies; pitch, co¬ lumnar, slaty, cannel, foliated, and coarse coal. Subspecies 1. Pitch Coal. Jm Hoicille Biciforme, Brochant, ii. 49. Exter. Char.—Found massive or disseminated ; and sometimes parts of vegetables, such as the branches of trees, are observed. Lustre shining, resplendent, resi¬ nous ; fracture conchoidal ; fragments sharp-edged. Colour perfect black, and the longitiKlinal fracture sometimes brownish ; soft; easily frangible. Specific gravity 1.3. Localities, Sec.—This is one of the most common varieties of coal, and therefore is found in all coal countries. Uses.—As it is susceptible of a fine polish, it is em¬ ployed for various ornamental purposes. The sub¬ stance known by the name of jet, belongs to this va¬ riety. Subspecies 2. Columnar Coal. La Houille Scapiforme, Brochant, ii. 15. Exter. -Found massive; in its fracture shin¬ ing or weakly shining, resinous ; fracture more or less perfectly conchoidal ; fragments indeterminate. Colour perfect black, or brownish black. It is com¬ posed of distinct concretions, which are columnar, pa¬ rallel, slightly curved, whose surfaces are smooth and shining; is soft, and easily frangible. Localities, &c.—This is a very rare variety of coal. It is found in the Meisner, near Almerode, in Hessia, in a basaltic mountain. Subspecies 3. Slaty Coal. La Houille Schisteuse, Brochant, ii. 52. Exter. Char.—Found massive in entire beds; lustre shining, sometimes only weakly shining or glimmering, resinous; principal fracture slaty; cross fracture imper¬ fect conchoidal ; fragments in the form of tables ; not very sharp-edged. Colour mineralogy. 216 Combus- Colour perfect black, often also grayish, rarely browh- tibles. isli black •, streak shining j soft, or semi-hard j easily * frangible. Specific gravity 1.25 to 1.37* Localities, &c.—This is the prevailing coal in Bri¬ tain, as at Newcastle and Whitehaven in England, and in the coal country both in the east and west of Scot¬ land. ^ Subspecies 4. CaNNEL Coae. La Houitte de Kilkenny, Brochant, ii. 55. Id. Kirwart, ii. 52. Exter. Char.—Found massive j lustre-weakly shin¬ ing, resinous j fracture commonly conchoidal, sometimes even and foliated j fragments sometimes rhomboidal or cubical. Colour grayish black j streak shining j soft', easily frangible. Spec. grav. 1.23 to 1.27. Localities, &c.—This coal accompanies the former in many places of England and Scotland, as at White¬ haven and Wigan in Lancashire in England j in the neighbourhood of Edinburgh \ and at Muirkirk, and other places in Ayrshire in Scotland. The coal at Kilkenny in Ireland belongs also to this variety 5 and from the places where it is found, is called Wigan or Kilkenny coal. Uses.—Beside being employed as fuel with other kinds of coal, this variety, being susceptible of a fine polish, is cut and formed into various useful and orna¬ mental purposes. It is said that the choir of the cathe- di’al church of Litchfield is covered with plates of this coal alternating with black marble. Subspecies 3* Foliated Coal. Le Charhon Lamcllciix, Brochant, ii. 54. Exter. Char.—Found massive j principal fracture resplendentcross fracture shining *, principal fracture more or less foliated ; cross fracture somewhat uneven > fragments rhomboidal. Colour perfect black, and on the sides of the fis¬ sures superficial colours appear, like the colours of tempered steel, or those of the peacock’s tail j easily frangible. Localities, &c.—This coal is found at Liege, in Saxony, near Dresden, and in some parts of France. Subspecies 6. Coarse Coal. La Houille Grossierc, Brochant, ii. 55. Exter. Char.—Found massive j is weakly sinning, resinous ; fracture uneven, or more or less slaty j frag¬ ments blunt-edged. Colour grayish black, sometimes brownish black ; streak shining *, soft j easily frangible. Localities, &c.—Accompanies the other kinds of coal, whose localities have been already mentioned. 7. Species. Coal BLENDE. This is divided into two subspecies, conchoidal and slaty. Subspecies 1. Conchoidal Coal Blende. La JLouille Eclatantc, Brochant, ii. 50. Glanx-kohlc of the Germans. Exter. Char.—Found massive, rarely disseminated ; Classili, lustre shining of resplendent, approaching to metallic j tion fracture .perfectly conchoidal •, fragments not very sharp- 'r*‘ edged. Colour iron black, inclining to brown, or exhibiting the superficial colours like tempered steel j soft j easily frangible. Chcm. Char.—Burns without any flame, leaving a white ash. Localities, &c.—This variety of coal is very rare. It is found at Newcastle, and at Meissiner in tlessia, along with the other varieties of coal. Subspecies 2. Slaty Coal Blende. Native Mineral Carbone, Kirw. ii. 49. La Blendt Charbonncvse, Brochant, ii. 57. Anthracite, Hatiy, ii. 307. Exter. Char.—Found massive and disseminated j in¬ ternal lustre shining, or resplendent, and between me¬ tallic and vitreous 5 fracture more or less perfectly slaty j cross fracture flat conchoidal 5 fragments some¬ times cubic, and sometimes in tables. Colour perfect black, approaching more or less to iron black, or grayish or bluish black •, opaque •, stains, but does not write $ soft 5 rather brittle ; very easily frangible. Spec. grav. 1.3 to 1.8. Chem. Char.—Reduced to powder, and heated in a crucible, this coal gives neither a sulphureous nor bitu¬ minous smell, and neither sulphur nor bitumen can be obtained from it. After being long exposed to heat, it consumes slowly without flame, and loses during the process about two-thirds of its weight. rlhe residue is of a blackish gray colour, which shows that the combus¬ tion has not been complete. Constituent Parts. Panzenberg. Loloimeu. Fure Carbone, 90 Silica, 2 13.19 Alumina, 5 3,29 Oxide of iron, 3 3-47 Loss, 8. 100 100.00 Localities, ike.—This variety has been found in a vein at Schemnitz in Hungary, in Pais de Yaud, in a transported rock, which seems to be intermediate be¬ tween granite and breccia •, at Konigsberg in Norway, where it is accompanied with native silver j in Saxony it forms an entire bed in a mountain of clay slate; also found in the island of Arran, and near Kilmarnock in Scotland. III. GRAPHITE Genus. 1. Species. Graphite, or Black Lead. Plumbago, Kirw. ii. 58. Ze Graphite, Broch. ii. 76. Fer Carbure, Hauy, iv. 98. This species is divided into two subspecies, scaly and compact. Subspecies 1. Scaly Graphite. Exter.Chan—Found massive and disseminated; lustre glimmering or shining, metallic *, fracture foliated, con¬ choidal, iirt I. MINERALOGY. choidal, sometimes uneven or slaty j fragments blunt- edged, sometimes trapezoidal j commonly appears in distinct granular concretions, which are small or fine grained, with a splintery aspect. Colour intermediate between bluish black and light iron black j sometimes steel gray, or brownish black j opaque ; streak shining ; stains and writes j soft; easily frangible j feels greasy. 217 FOURTH CLASS. METALLIC ORES. I. PLATINA Genus. Metallic Ores. Species. Native Platina. Id. Kirw. ii. 103. Le Platine Natif Broch. ii. 86. Platine Natif Ferriferc, Hauy, iii. 368. Subspecies 2. Compact Graphite. Exter. Char.—This subspecies approaches so near to the former in its characters, that it seems diffi¬ cult to distinguish it. The following characters and circumstances connected with the natural history of graphite, refer to both. Specific gravity 1.987 to 2.456. Chem. Char.—When exposed to heat in a furnace, it^gives out, during combustion, a great proportion of carbonic acid, leaving a residuum of red oxide of iron. •bar. Acs Carbone, fo, N° Iron, I?. 16. Silica, Alumina, Constituent Parts. JBerthollet. 9°-9 9.1 Scheele. 90 10 Vauquelin. 23* 2 38 37 100.0 100 100 Of the above analysis it must be observed, that the two first by Berthollet and Scheele must have been very pure specimens of graphite 5 and, on the contrary, the specimens analyzed by Vauquelin must have been very impure, containing so large a proportion of earthy matters, and so small a proportion of the proper ingre¬ dients of that mineral. Localities, &c.—This mineral, which is not very common, is found chiefly in primitive mountains. It is met with in Spain, France, Bavaria, and Hungary. In England at Borrowdale near Keswick in Cum¬ berland ; and at Craigman, near New Cumnock, in Ayrshire in Scotland, where it is found in detached masses among rocks nearly similar to those which ac¬ company coal. Uses.—Graphite or black lead is employed for ma¬ king pencils. The coarser parts are employed in ma¬ king crucibles. It is also employed for covering cast iron, such as grates, to defend them from rust j and on account of its unctuous property, it is applied to those parts of machines which are subject to friction, for the purpose of diminishing it. 2. Species. Mineral Charcoal. This substance, which accompanies the other varie¬ ties of coal already described, is of a woody texture, and has therefore a fibrous fracture, with somewhat of a shining and silky lustre. It is usually found in thin layers with the other varieties of coal, and perhaps it might be considered as coal less perfectly formed; but in its characters it agrees so much with the va¬ rieties of coal blende, that it seems quite unnecessary to make it a separate species.' Vol. XIV. Part I. ‘ + Essen. Char.—Of a silver white colour, and infusible* Exter. Char.—Platina is found in the form of small flat or rounded grains ; surface smooth, with shining metallic lustre ; streak resplendent. Colour light steel gray, or silver white ; semi-hard 5 ductile ; flexible in thin plates. Spec. grav. 15.601 to 17.7; but when purified, and hammered, 23, and according to some, 24. Chem. Char.—Is almost infusible without addition, in the focus of a burning glass, or exposed to the action of oxygen gas. It does not amalgamate with mercury, and is only soluble in nitro-muriatic acid. Localities, &c.—Platina was first brought to Europe by Don Ulloa in 1748. The repository of this metal is not known, and it has been found only in South Ame¬ rica, till lately that it was discovered in gray silver ore from the mine of Guadalcanal in Spain. In the ana¬ lysis of this ore, Vauquelin found the platina to be in the proportion of Uses.—Platina is one of the most valuable mineral substances, as, on account of its hardness and infusibi- lity, it may be applied to many of the purposes of gold and iron ; and from its properties of being less liable to change when exposed to the air, or to the ac¬ tion of other chemical agents, it answers those purposes in a superior degree. Platina in its crude state is alloyed with other me¬ tallic substances. It has been long known that it is accompanied with particles of iron, gold, and some other substances. It contains also an ore of one of the new metals. This is iridium, which is alloyed with osmium, another new metal, both which were discover¬ ed by Mr Tennant. This ore is composed of plates j it is not malleable ; its specific gravity is 19.5, and it is not acted on by nitro-muriatic acid, which dissolves pla¬ tina. Rhodium and palladium, two other new metals, are alloyed with platina. II. GOLD Genus. Species. Native Gold. This species is divided into three subspecies; 1. gol¬ den yellowj 2. brass yellow; and, 3. grayish yellow. Subspecies 1. Golden-yellow Gold. VOr Natif, Jaune r/’ Or, Broch. ii. 89. Native Gold, Kirw. i. 93. Exter. Char.—Gold is found most frequently disse¬ minated, superficial, or in grains ; reticulated, dendri- tical, capillary, or cellular, often in small plates, more rarely crystallized. The forms of its crystals which have been observed, are small perfect cubes, regular octahedrons, dodecahedrons, double eight^sided pyra¬ mids, terminated by four-sided summits, placed on the E e • four 2 I 8 mineralogy. Part Metallic Ores. four lateral edges of the pyramids alternately ■, but the crystals are small and ill defined ; the surface is smooth and resplendent 5 that ot the small plates drusy and shining j that of the grains only strongly glimmer¬ ings internal lustre weakly shining, metallic j fracture hackly. _ This variety presents the perfect colour ot gold^ It is soft; perfectly ductile, flexible, but not elastic 5 streak resplendent. Spec. grav. of pure gold 19.64. Subspecies 2. Brass-yellow Gold. i’Or Natif cPunjaune de laiton, Broch. ii. 91. Exter. Char.—This variety is almost always found disseminated in small particles, or superficial} some¬ times also capillary, in small plates, or crystallized in thin six-sided tables. The colour is that of brass of various shades, accord¬ ing to the proportion of alloy. In other characters it resembles the former, excepting in the specific gravity, which is inferior, owing to the greater proportion of other metals with which it is alloyed. Subspecies 3. GRAYISH-YELLOW GOLD. /2 Or Natif d'unjaun grisatre, Broch. ii. 92. Exter. Char.—This variety is also found disseminated in small flattened grains •, surface is not very smooth ; almost uneven, and weakly shining. Colour steel gray, approaching to that of brass : spec. grav. of this variety is greater than the last, but inferior to the first. In other external characters they are the same. Chem. Char.—Native gold is only soluble in nitro- muriatic acid , platina is also soluble in the same acid, but it is not, like gold, precipitated from its solution by sulphate of iron. Constituent Parts.—Native gold is not always found pure. It is frequently alloyed with silver or copper, or with both, and sometimes also, it is said, with platina. To these alloys the difference ot colour, which is .the foundation of the division into three varieties, is owing. The first variety is the purest, containing only a small proportion of silver or copper-, the second has a greater proportion of these metals $ and the third, it is supposed, is alloyed with a small portion of platina. Uses.—Gold (on account of its indestructible nature, and its remarkable malleability and ductility), is one of the most important and valuable ol the metals for many purposes; but its uses, whether as money, or ar¬ ticles of luxury, are too well known to require enume¬ ration. As pure gold has no great degree of hardness, it is necessary to alloy it with a portion of copper. Ihis is not less than and never more than -J. Localities, &c.—Gold is chiefly found in primitive mountains, and there it is usually in veins, sometimes disseminated in the rock itself. The accompanying substances are quartz, feldspar, limestone, heavy spar, pyrites, red silver, vitreous silver, and galena. Gold is also mixed with manganese, gray cobalt, nickel, and malachite. Gold has also been found, it is said, in fossil substances, as in petrified wood, penetrated with siliceous earth, a mass of which was dug out at the depth of 50 fathoms, in an. argillaceous breccia, or, as 4 is supposed by some, a porphyry with an argillaceous Classific; basis, in Transylvania. This is considered as a proof tion. of the more recent formation of gold, as well as the dis¬ covery of Patrin, who found native gold surrounded by muriate of silver, in the mine of Zmeof in Siberia. Muriate of silver is supposed to be comparatively a late production. But gold is perhaps more common to alluvial soil j there it is disseminated in grains, along with siliceous, argillaceous, and ferruginous sand, of which ceitam soils are composed j and also in the sand of many rivers: and it is observed that the gold is most abundant when the waters are at the lowest, and especially soon after floods, which shews that the gold is carried down along with the earthy matters which are swept away by the violence of the current. It has been supposed too, that the gold found in the bed of rivers, has been detached, by the force of the waters, from the veins and primitive rocks traversed by these currents j and according to this opinion, attempts have been made to trace the source of these auriferous sands, in the hope of discovering the native repository of this precious metal j but these at¬ tempts have usually failed, for it has been found that the gold is peculiar to the alluvial soil through which the stream is carried, and in which the gold is collected. This point seems to be established by the observations of naturalists. 1. The soil of those plains frequently contains, to a certain depth, and in particular places, particles of gold, which may be separated by washing. 2. The bed of the rivers and auriferous streams yields a greater proportion of gold, after the plains which are traversed by those rivers have been flooded, than in any other circumstances. 3. It has always been obser¬ ved, that gold is found in the sand of rivers in a very limited space. By examining the sand of these, rivers higher up, and nearer to their source, no gold is found j so that if this metal were derived from the rocks, which are swept by the currents, the quantity would be great¬ est nearest to their sources but observation has proved the contrary. Thus the river Oreo contains no gold, but from Pont to the place where it joins the Po. 11'C Tesin affords no gold till it has traversed Lake Major, where its course must have been retarded, and where all the heavy particles of matter which it carried along with it from the primitive mountains, must have been deposited. The quantity of the gold collected on the Rhine near Strasburg, is greater than what is found near Basle, which is more in the vicinity of the moun¬ tains. No gold has been discovered in the sands of the Danube during the first part of its course. Those sands become only auriferous below Efferding, *1 he same remark may be applied to the Lms. The sands of the upper part of this river, which traverses the mountains of Stiria, contain no gold *, but from the pjace where it enters the plain at Steyer, till it joins the Danube, its sands are auriferous, and sufficiently rich to be wash¬ ed with advantage. The most of the auriferous sands in all parts of the world, are of a black or reddish colour, and consequent¬ ly ferruginous. From this circumstance, connected with the gold of alluvial land, some naturalists have inferred, that it is owing to the decomposition of auriferous pyrites. It was observed by Reaumur, that the sand which accompanies gold in most of the rivers, and par¬ ticularly in the Rhone and the Rhine, is like that of J Ceylon MINERALOGY. 29 (Trance. Ceylon and Expailly, composed of iron and small grains of rabies, corundum, hyacinth. Titanium also has been discovered. It has been observed besides, that the gold of alluvial soil is purer than that which is immediately obtained from rocks, from which it is supposed that it has a different origin. It does not appear to be certainly ascertained, that gold is found in volcanic soil. Such are the general facts relative to the repositories of gold. We shall now briefly mention the more re¬ markable places where gold has been found and collec- g ed, beginning with those of Europe, id mines Spain formerly had mines of gold 'y the richest wras pain, in the province of Asturias, where it was dug out from regular veins. These mines, according to ancient histo¬ rians, were wrought by the Phoenicians, and afterwards by the Romans •, but they have been totally abandoned since the discovery of America, and the mineral riches ofdhat country. The rivers of Spain, as w'ell as the Tagus in Portugal, contain auriferous sand. The only mine of gold which in modern times has been wrought in France, was discovered in 1781, at Gardette, in the valley of Oysans, department of Isere. This was a regular vein of quartz, traversing a moun¬ tain of gneiss, and containing auriferous sulphuret of iron, and some fine specimens of native gold 5 but it was not sufficiently rich to defray the expence of the opera¬ tions. Many of the rivers of that country contain au¬ riferous sand, as the Rhone, the Rhine, the Garonne, and others of smaller note ; and it is said that gold is also found among the black sand, and particles of mo- rassy iron ore, in the neighbourhood of Paris. In Piedmont there are some mines of gold. At the foot of Mount Rosa, veins of auriferous sulphuret of iron have been discovered, traversing gneiss 5 and al¬ though these pyrites do not yield more than 10 or II grains of gold in the quintal, it has been found worth while to continue the operations. On the south side of the Apennine mountains, there are several auriferous rivers and soils. Some of the rivers of Switzerland also contain auri¬ ferous sands. Such are those of the Reuss and the Aar. In Germany the only gold mine which is wrought is in Saltsburg, in the chain of mountains which traverses that country from east to west, and which separates it from the Tyrol and Carinthia. But Schemnitz and Cremnitz are the most remark¬ able places in Europe for mines of gold and auriferous sands. The gold of Schemnitz is accompanied by sil¬ ver, lead, and iron pyrites, and the matrix is quartz. Auriferous sand is found not only in the bed of the river Neva, but this sand is still richer in the plain through which the river flows. According to De Born, this is a ferruginous sand, lying below a bed of chalk. In Transylvania the celebrated gold mine of’Nagyag is remarkable for having the gold combined with na¬ tive tellurium. There is also another mine at Felso- banya, the ore of which is an auriferous sulphuret of silver, in a vein of a kind of jasper. The rivers of this country also contain gold. The plain on the banks of the river Moros contains an auriferous sand, which is deposited between two beds, neither of which yields a particle of gold. The upper stratum is vegetable soil, and the lower is composed of schistus. 2Uj 13° ffied- The mines of Hungary are the only gold mines in Metallic Europe which are of any importance. Ores. In Sweden gold is obtained from the mine of Edel- 1 "■ v-— fors in the province of Smoland. This mine yields na-gwe^ tive gold, and auriferous iron pyrites. The veins are composed of brown quartz, traversing a mountain of schistose hornstone. The gold is sometimes disseminated in the rock itself. In Greece, the island of Thasos in the Archipelago Greece. was celebrated in antiquity for its rich mines of gold. The ancients also, it is said, found abundance of gold in Thrace and Macedonia. The alluvial soil in several places of the British IreIa^ islands, have also furnished gold. Not many years ago, a considerable quantity of gold was collected in a sandy soil, on the mountains of Wicklow in Ireland. Several masses of native gold, exceeding an ounce in weight, wrere found in that soil j one weighing 22 ounces was found, w hich is said to be the largest specimen of native gold found in Europe. It would appear that gold was collected at a very scot]and early period in Scotland, and particularly in the mine field oi Leadhills ; but the most extensive operations were carried on by Buhner an Englishman, in the time of Queen Elizabeth. The trenches, heaps of soil that had been turned up, and other marks of these ope¬ rations, yet visible between Leadhills and Elvanfoot, still retain the name of Buhner's Workings, and the place where the gold was washed, is still called the gold scour. At that time, it is said, an immense quantity of gold was collected. Not many years ago, similar operations were resumed by the advice of a German ; 'but so far as we understand, the quantity of gold collected was scarcely equal to the expence. The operations during the last attempt were carried on under the superinten¬ dance of the late Mr John Taylor, manager of the mines at Wanlockhead j a man of no common sagacity, bv which he was enabled to collect many curious facts with regard to the natural history of gold. The gold was found in that country immediately under the vegetable soil ; and the method of conducting the operation was, to direct a small stream of water so as to carry this soil along with it, to basons or hollow places, where the water might deposit the matters which had been carried along by its current. Tire matter deposited was repeatedly washed, till the whole of the earthy substances were carried off’. The gold being heaviest, sunk to the bottom, and remained behind. Among other facts which Mr Taylor communicated to us, and which he observed during the progress of these opera¬ tions he found, that the gold wras always most abundant near the top of the lead veins which traverse that coun¬ try. He was so satisfied of this fact, that he could tell, merely by the quantity of gold increasing, when they approached to a vein •, and on the other hand the quan¬ tity diminishing as they receded from the vein. This fact show's that there is some connection between me tallic veins and the formation or deposition of gold. Gold is still found in the soil of that country 5 but whether the quantity be less than formerly, or the ex¬ pence of collecting it, from the difference in the price of labour, greater, the produce is by no means equal to the expences, and therefore searching for gold is now only the employment of the leisure hours of some of the miners. , E e 2 The 2 20 Metallic Ores. 36 Asia. .37 Africa. 3S America. MINER The whole extent of the continent of Asia furnishes gold, in greater or smaller quantity. Gold is found in several of the mines of Siberia, and particularly in that of Beresof, which yields auriferous pyrites partially de¬ composed. and disseminated in a vein ot quartz. In the southern parts of Asia, many mines, and particu¬ larly the sands of the rivers, contain gold. I he I ac- tolus, a small river of Lydia, was celebrated m anti¬ quity for the quantity of gold which it yielded, and it was supposed to be the source of the riches ot Croesus. Japan, Formoso, Ceylon, Java, Sumatra, Borneo, the Philippines, and other islands ot the Indian Archipe¬ lago, are supposed to be rich in gold at this day. . 'The greatest quantity of gold which the ancients possessed, beside what was obtained from Spain, was brought from Africa. The gold ot Africa, which stil forms an important article of commerce, is always m the state of gold dust; a circumstance which shews that it is chiefly extracted from alluvial soil by washing. Lit¬ tle gold is found in the northern parts of Africa; three or four places are remarkable for the quantity of gold which they yield. The first is that part of the countiy between Darfour and Abyssinia. The gold collected there is brought by the Negroes for sale in quills of the ostrich and of the vulture. It would appear that this country was known to the ancients, who regarded Ethiopia as a country rich in gold; and Herodotus mentions that the king of that country exhibited to the ambassadors ot Cambyses, all the prisoners bound with chains of gold. . The second great source of gold dust in Africa is to the south ot the great desert Zara, in the western part of that country. The gold is collected in that exten¬ sive flat which stretches along the toot of the lofty mountains, among which the rivers Senegal, Gambia, and Niger, have their origin. Gold is found in the sands of all these rivers. Bambouk, which lies to the north-west of these mountains, supplies the greatest part of the gold which is sold on the western coast of Africa; at Morocco, Fez, and Algiers, as well as that which is brought to Cairo and Alexandria in Egypt. • i • A third region of Africa where gold is abundant, is on the south-east coast, opposite to Madagascar ; and it is said that the gold brought from Ophir, in the time of Solomon, wras from that part of Africa. America is the richest country of the world, in mo¬ dern times, in this precious metal. There it is collect¬ ed in the alluvial soil, and in the beds ol rivers, and sometimes, but more rarely, in veins. In Mexico, gold is chiefly found in the numerous silver veins ot that country. All the rivers in the province of the Carac- cas, about io° north of the equator, furnish gold. In the Spanish part of America, Chili furnishes gold from the alluvial soil, as well as the province of Choco, where it is more abundant; while that of Peru is ob¬ tained from veins of quartz, marked with ferruginous spots. But the greatest quantity of gold of commerce pomes from Brazil, where it is collected in the alluvial soil, and in the sand of rivers, and extracted by washing. Gold is found almost everywhere in that country, at the foot of the immense chain of mountains which is nearly parallel with the coast,, and which stretches from the 50 to the 30° of S. Lat. A L O G Y. HI. MERCURY Genus. j. Species. Native Mercury. Mercury, Kirw. ii. 223. Meroure Natif, Broth, ii. 241. JTtf. Hauy, iii. 423. Essen. Char.—Remains liquid till the temperature be reduced to 40° below o Fahrenheit. Exter. Char.—Native mercury exists disseminated, in globules of different sizes, in small cavities of other ores of mercury ; lustre resplendent, metallic. Colour shining white, or tin white ; opaque ; perfect¬ ly fluid ; does not wet the finger ; feels very cold. Sp. gr. 13.568 to 13.581. Chem. Char.—Volatile before the blow-pipe, without diffusing any perceptible odour. Native mercury is understood to be pure, and haying all the properties ot that metal; but it is sometimes ama Igamated with a little silver, which destroys its flui¬ dity in a slight degree, and renders it somewhat vis- cous. Localities, &e.—Native mercury is usually found along with the other ores of that metal, as at Idua, 111 Friouli, and. at Almaden in Spain; but the great pro¬ portion of the mercury of commerce is obtained by dis¬ tillation from native cinnabar. There is also it is said, a rich mine of native mercury near Guan^a \ elica in Peru. (9.__For many purposes mercury is one of the most important of metallic substances. It is extensively em ployed in metallurgy, in extracting gold and silver from their ores, by the process to he afterwards descri¬ bed, called amalgamation. The uses of mercury in gild¬ ing, in silvering the backs of mirrors, and in medicine, are well known. 2. Species. Native Amalgam. Natural Amalgam, Kirw. ii. 223. L'Amalgam Natift Broch. ii. 99. Mercure Argental, Hauy, iii. 432. Essen. Char.—Communicating to copper a silvery colour by friction. Exter. Char.—This species is rarely found massive, but usually disseminated, or superficial, sometimes im¬ perfectly crystallized. The form of its crystals is the octahedron, dodecahedron, but it is usually found in thin plates or leaves ; lustre resplendent, or shining; fracture conchoidal. Colour between shining or tin white, and silvery white, according to the predominance of the mercury or silver; soft, and partially fluid ; brittle, and easily frangible. Chem. C/zar.—Exposed to heat the mercury is driven off, and the silver remains behind. Mercury, Silver, Constituent Parts. Heyer. Cordier. 75 73 25 27 100 100 100 Localities, Sec.—This mineral is rare, and is met with, according to De Born, in the mines of mercury :rt 1. MINER !isiiica- whose veins are crossed by veins of silver ores. It is non. found chiefly at Rosenau in Hungary, in Moersfeld, ' and Moschellansberg, in the duchy of Deux Fonts, and at Sahlberg in Sweden. It is usually found in a yel¬ lowish or reddish ferruginous clay, and accompanied by other ores of mercury. 3. Species. Corneous Ore of Mercury. Mercury mineralised by the vitriolic and murine acids, Kirw. ii. 229. Le Mine de Mercure corner, Broch. ii. 101. Mercure muriate, Hauy, iii. 447. Essen. Char.—Colour pearl gray, volatilized by the blow-pipe. Exter. Char.—Rarely found massive or disseminated, but usually in thin crusts, or in small globules, com¬ posed of an assemblage of small crystals, which are either perfect cubes, or six-sided prisms, terminated by a four-sided pyramid j a six-sided prism bevelled at the extremity ; or an eight-sided prism with four broad and four narrow alternating faces. Crystals shining, some¬ times resplendent j internal lustre shining and adaman¬ tine •, fracture foliated. Colour smoke gray, ash gray, or grayish white 5 translucent; tender, and easily frangible. Client. Char.—Entirely volatilized before the blow¬ pipe, w ithout leaving any residuum, and without decom¬ position. The constituent parts are about 70 of mercury, 29 of muriatic acid, and a small portion of sulphuric acid. Localities, &c.—This mineral has only been knorvn about 13 years, and it is hitherto but rare. It was dis¬ covered in the mercury mines of the duchy of Deux Fonts by Woulfe, and has been since found at Almaden in Spain, and at Horsowitz in Bohemia. The repo¬ sitory is in the cavities of a ferruginous clay, which is mixed with malachite and gray copper ore. 4. Species. Liver or Hepatic Ore of Mercury. Mine de Mercure hepatiquc, Broch. ii. 104. Hepatic mercurial ore, Kirw. ii. 224. Mercure sulfure hilu- minifere, Hauy, iii. 446. This is divided into two subspecies, 1. compact, and 2. slaty. Subspecies 1. Compact Liver Ore of Mercury. Exter. C/wzr.—Found massive or disseminated 5 lus¬ tre glimmering, metallic j fracture even, sometimes fine-grained uneven j fragments blunt-edged. Colour betw een lead gray, and cochineal red 5 colour of the streak deep cochineal red, and shining 5 tender, and easily frangible. Sp. gr. 7.18 to 7.93. Subspecies 2. Slaty Liver Ore of Mercury. Exter. Char.—Found massive; lustre shining, and resplendent’, in the cross fracture glimmeringj lustre in general metallic, but sometimes vitreous ; principal .tracture slaty, in curved thick leaves; cross fracture compact and even ; fragments in plates. Colour ot the preceding, but somewhat darker, and approaching to that of iron ; opaque 5 streak shining ', powder between cochineal and scarlet red j tender, and very easily frangible. Localities, &c.—This is the most common ore of A L O G Y. mercury in Idria, where it forms considerable beds, and yields about 60 per cent of mercury. It is found also, along with other ores of mercury, in Spain and Siberia. MctalJic Ores. Liver ore of mercury consists of cinnabar, or th*> sulphuret of mercury, mixed with a portion of indura¬ ted bituminous clay. At Idria it is called branders, or coaly earth, on account of the predominance of the bitumen. 5. Species. Cinnabar. This species is also divided into two subspecies, con- mon and fibrous. Subspecies 1. Common Cinnabar. Le Cinnabre Commun, Broch. ii. 107. Hark Red Cin¬ nabar, Kirw. ii. 223. Mercure Sulfure compacts, Hauy, iii. 440. Exter. Char.—Found massive or disseminated, or in superficial layers, or cellular and kidney-form, and also crystallized. Forms of the crystals are, a double four¬ sided pyramid with truncated summits; a cube having its opposite diagonal angles truncated ; a rhomboidal prism j a three-sided prism terminated by a three-sided pyramid, which also is truncated. The crystals, which are usually small, are confusedly grouped together : surface of the rhomboidal prism transversely streaked, of the others smooth ; external lustre shining or resplen¬ dent internal the same, or only glimmering, vitreous, or adamantine} fracture foliated, uneven, or rarely splintery; fragments sharp-edged. Colour cochineal red, carmine red, and in some va¬ rieties lead-gray 5 opaque, rarely translucent at the edges •, crystals translucent, or semitransparent; streak shining, scarlet red 5 tender, and easily frangible. Spec, grav. 6.902 to 7.86. Chem. Char.—Before the blowr-pipe common cinna¬ bar is entirely volatilized with a blue flame, and a sul phureous odour. Constituent Parts. Mercury, Sulphur, Iron, Lampadfus. 81 *5 4 100 Localities, &c.—This is the most common ore of mercury, and may be considered as the gangue or ma¬ trix of the other ores. Found not only in primitive mountains, where it forms beds in clay and chlorite slate, but also in stratiform mountains, and even in al¬ luvial rocks. The mines of Almaden in Spain, of Idria in Friouli, and those of the duchy of Deux Fonts, have furnished the greatest quantity of common cinnabar. It is also found in Bohemia, Saxony, and Hungary, and in small quantity in Fi'ance, Subspecies 2. Fibrous Cinnabar. Le Cinnabre d'un Rouge vif, Brochant, ii. m. Bright red Cinnabar, Kirwan, ii. 229. Mercure sulfure fi- breux, Hauy, iii. 440. Exter. Char.—Found massive, disseminated, or super¬ ficial j 222 Metallic ficial •, lustre glimmering, silky, often also entl^ ‘ Ores. fracture fine grained ear tin’, or fibrous j fragme ' edged. Colour bright scarlet red, sometimes crimson or au¬ rora red ; opaque } streak shining scarlet red j stains 5 very tender or friable, and very easily frangible. localities, &c.—This variety is wry rare in a-state of purity. According to Hauy, most of the specimens owe their texture to an admixture of radiated sulphuret of iron. It has been found chiefly at Wolfstem in the Palatinate, where it is accompanied by brown iron ore and hematites. Uses.—Cinnabar is dug out chiefly for the purpose ot extracting the metallic mercury. It is employed also as a colouring matter in painting-, but the cinnabar used for this purpose is chiefly artificial. Some other varieties of cinnabar, or sulphuret of mer¬ cury, have been noticed by mineralogists, as a native ethiops mineral. This is of a black colour, a loose consistence, and it stains the fingers. It appears to be some bituminous substance penetrated with cinnabar. It is found at Idria. Alkaline cinnabar of De Born is found at the same place ; is of a bright red colour, foliated fracture, with yhomboidal fragments ; and supposed to be cinnabai penetrated with an alkaline sulphuret, the odour of which it gives out by friction. Another variety ot cinnabar, usually called native vermilion, is in the form of powder. This substance is very rare, but is also sometimes found at Idria. IV. SILVER Genus. mineralogy. I. Species. Native Silver. per in the solution of nitrate ot silver, tiie silver is re- -duced, and appears in the metallic state. Localities, &c.-—Native silver is not uncommon in most of the mines which furnish the other ores of that metal. The accompanying substances are usually heavy spar, quartz, calcareous spar, fluor spar, pyrites, blende, cobalt, and tralena. Native silver is very abundant in Mexico and Peru, and it is also not uncommon in Si¬ beria, in Germany, France, and was lately discovered in the Herland mine in Cornwall. Subspecies 2. Auriferous Silver. Exter. Char.—This variety is rarely found massive, but is usually disseminated in small particles, or superfi¬ cial, or reticulated, or in thin plates j lustre shining or resplendent 5 fracture hackly. Colour between silver white and brass yellow, some¬ times approaching to gold yellow j it is soft, peifectly ductile j flexible without being elastic, and its specific gravity is greater than common native silver in pro¬ portion to the quantity of gold with which it is al¬ loyed. Constituent Parts.—Auriferous silver is a compound of silver alloyed with gold, the latter sometimes in very considerable proportion. < Localities, &c.—This mineral is very rare. It is found at Konigsberg in Norway, disseminated in massive calcareous spar, fluor spar, and rock crystal, accompa¬ nied by blende, galena, and pyrites, in a vein which traverses a rock ot slaty hornblende. It is also found 111 Siberia, in granular heavy spar accompanied by vitreous silver ore, vitreous copper ore, and pyrites. 2. Species. Antimonial Silver Ore. Id. Kirwan, ii. 108. iJ. Brochant, ii. 114. if/. .Hauy, iii. 384. This is divided into two subspecies, common and auriferous. Subspecies 1. Common Native Silver. Exter. Char.—Common native silver is usually found disseminated or superficial, under different imitative forms, as dentiform, filiform, capillary, dendritic, reti¬ culated, veined, or in thin plates; and sometimes crys¬ tallized, in cubes, octahedrons, rectangular four-sided prisms, double six-sided pyramids with truncated extre¬ mities, double three-sided pyramids with truncated angles, and hollow four-sided pyramids. The crystals are small and grouped together in rows, or dendritical, or reticulated j surface smooth; that of the platee drusy, that of dentiform, filiform, and capillary silver longi¬ tudinally streaked j external lustre glimmering or re¬ splendent; internal always glimmering, metallic; frac¬ ture hackly ; fragments rather sharp-edged. Colour silvery white, but sometimes on the surface yellowish brown, or grayish black ; opaque; soft; per¬ fectly ductile; flexible, but not elastic; streak shining, metallic. Spec. grav. 10 to 10.47. Chem.Char.—Native silver is soluble in nitric acid, and may be precipitated by muriatic acid, the muriate of silver being insoluble; or by immersing a plate of cop- Argent Antimonial, Brochant, ii. 119* Jd. Ha.uy, iii. 391. Antimoniated Native Silver, Kirwan, ii. no. Essen. Char.—Colour silvery white ; brittle. Exter. Char.—Found massive or disseminated, kidney- form ; or crystallized in four-sided oblique prisms, in six-sided prisms, sometimes with the lateral edges trun¬ cated, in six-sided tables, and in cubes, having some of the angles truncated. Surface of the crystals longi¬ tudinally streaked; lustre weakly shining, or only glim¬ mering ; internal lustre shining or resplendent; fracture foliated. . c . . , Colour silvery white, sometimes a superhcial colour between yellow, black, and gray, or the colour of tem¬ pered steel; streak shining; semihard. Spec. grav. 0.44. Chem. Char.—Before the blow-pipe it is easily re¬ duced ; the antimony is driven off and gives out its pe¬ culiar odour, while the pure silver remains behind in- crusted with a brown slag, which communicates to bo¬ rax a green colour. ..... When antimonial silver is dissolved in nitric acid, a whitish crust, which is the oxide of antimony, soon ap¬ pears on the surface. This mineral, as its name imports, is an alloy of sil¬ ver and antimony, in which sometimes a small portion of iron is observed. The proportions of the two metals seem to be very variable. Constituent 1. mineralogy. ifica Constituent Parts. Klaproth. Silver, Antimony, 76 24 100 84 16 100 Yauquelin. 78 22 IOO Silver, Arsenic, Iron, Antimony, Loss, I2-75- 35* 44*25 4- 4* 100.00 Localities, &c.—This is a rare mineral, which has been found at Andreasberg in the Hartz, accompanied by native arsenic, red silver ore, galena, brown blende, and calcareous spar. 4. Species. Corneous' Silver Ore. Id. Kirwan, ii. 113* La Mine Come, Broch. ii. 127. Argent Muriate, Hauy, iii. 418. Kssen. Char.—The colour of horn } fusible like wax. Exter. Char.—Barely found massive; sometimes dis¬ seminated in globular pieces, often ia superficial layers, and very often crystallized. The forms are, the per¬ fect cube, capillary or needle-formed crystals •, ,the cry¬ stals are always small, and commonly grouped together. Surface smooth, shining or weakly shining *, internal lustre the same} resinous} fracture uneven, or flat con- choidal} fragments blunt edged. Colour light pearl gray, violet blue, or lead gray} becomes brown or blackish in the air} translucent} sometimes only at the edges} very soft} receives the impression of the nail} ductile, and in thin plates, flexi¬ ble. Spec. grav. 4.748 to 4.804. Chem. C/iar.—-Corneous siver ore melts very easily before the blow-pipe, giving out a disagreeable smell, and the globule of silver remains. Localities, See.—This ore of silver is accompanied by calcareous spar, heavy spar, native silver, galena, and quartz, in a vein near the duchy of Furstenburg in Swabia. It has also been found in carbonate of lime and heavy spar near Guadalcanal in Spain. 3. Species. Arsenical Silver Ore. Ld. Kirw. ii. in. Argent Antimonial Arsenifere, et ferrifere, Hauy, iii. 398. Exter. Char.—Found massive or disseminated, kid¬ ney-form or globular, and also crystallized in perfect six-sided prisms ; in similar prisms a little flattened, and having the lateral edges rounded} and in acute six-sided pyramids with truncated summits. Lustre weakly shin¬ ing, sometimes shining; internal lustre shining or re¬ splendent } fracture foliated *, fragments sharp-edged. Colour tin-white, or lead gray, but exposed to the air yellowish, or steel gray} streak shining} soft} brittle. Chem. Char.—Before the blow-pipe the arsenic is driven oil in fumes, diffusing the smell of. garlic.} there remains behind an impure globule of silver. Constituent Parts. Klaproth. Constituent Parts. Silver, Muriatic acid, Sulphuric acid, Oxide of iron, Alumina, Lime, Loss, Klaproth. 67*75 21. •25 6. J-75 ■25 3* 100.00 Silver, Muriatic acid, Alumina, With a trace of copper, 25 8 67 100 This variety is found at Andreasberg in the Hartz* Another variety has been described under the name of alkaline silver ore, which is nothing more than the mu¬ riate of silver combined with carbonate of lime. 5. Species. Sooty Silver Ore. Id. Kirw; ii. 117. L1 Argent Noir, Broch. ii. 132. Exter. Char.—Found massive or disseminated, perfo¬ rated or corroded ; in superficial layers upon other mi¬ nerals, or in rounded pieces, covered by muriate of sil¬ ver} consistence intermediate between solid and friable} dull} fracture fine grained earthy }: fragments blun.t- edged. Colour bluish black, or blackish gray} streak shin¬ ing, metallic ; stains a little} easily frangible. Chem. Char.—Melts easily before the blow-pipe into a slaggy mass, which, by continuing the heat, is par¬ tially volatilized, and the globule of silver remains. Its Localities, &c.—Muriate of silver is always found at the upper part of the vein, and it is said that it some¬ times accompanies organized substances. Leaves of na¬ tive silver have been found attached to petrifactions, at Frankenburg in Hessia} it is supposed that this metallic silver is the result of the decomposition of the muriate of silver. Corneous silver ore is almost always accom¬ panied by vitreous silver, sooty silver, brown iron ore} more rarely by native silver, red silver, galena, quartz, and heavy spar. It is found in Peru and Mexico, in the mines of Freyberg in Saxony, at Allemont in France, and in Siberia. Another variety of muriate of silver has been de¬ scribed by some mineralogists under the name of earthy corneous silver ore} or, according to the fanciful Ger¬ man name, butter-milk earth. This variety has an earthy fracture, owing to a portion of alumina which is combined with it. It is almost friable } ttie lustre of the streak is resinous, and it feels somewhat greasy. Chem. Char.—Before the blow-pipe it is slightly agglutinated without melting, and small globules of silver exude from the mass. Constituent Parts. Klaproth. 224 Metallic Ores. miner Its constituent parts are still unknown ; as it is usual¬ ly accompanied by vitreous, corneous, and some other silver ores, it is supposed to be a mixture of those ores in different proportions. . Localities, &c.—Found in Saxony, in France, and in Hungary. 6. Species. Vitreous Silver Ore. Sulphurated Silver Ore, Kirw. ii. 115* L'Argent Vi- tra&v, Brochant, ii. 134* Argent Sulphure, Hauy, iii. 398. Exter. Char.-—Commonly found massive, dissemina¬ ted, or superficial ; sometimes dentitorm, filiform, ca¬ pillary, dendritic, or reticulated, with other forms and impressions. It is also crystallized in cubes, which are either perfect or truncated on the angles or edges *, 111 octahedrons, which are either perfect, or truncated on the angles ; in flat, double, three-sided pyramids, the edges of the one corresponding to the laces ot the other ) in rectangular lour-sided prisms, terminated by a four-sided pyramid j in equiangular six-sided prisms, terminated at the two extremities by a three-sided py¬ ramid •, corresponding alternately to three ol the lateral edges, forming the garnet dodecahedron, of which all the lateral edges are sometimes slightly truncated in broad and flat six-sided prisms bevelled at the extremity, and having the angles at the acute lateral edges turn- cated. The crystals are commonly small, and grouped together in rows, or in knots, like the steps of a stair ", the cube and the octahedron are the most common, and the cube is sometimes hollow. The surface ol the crystal is usually smooth, sometimes rough or drusy •, lustre between shining and weakly glimmering } internal lustre shining, metallic ; fracture conchoidal, sometimes foliated *, fragments blunt-edged. Colour dark lead-gray, steel-gray, or blackish gray, varying hy exposure to the air •, streak shining } soft} ductile •, may be cut with a knife j flexible without be¬ ing elastic. Spec. grav. 6.909 to 7.215. Chem. Char.—Before the blow-pipe vitreous silver is reduced to the metallic state, and the sulphur is driven off. By gradually heating it in a furnace, the sulphur may be dissipated without fusion, and the silver is redu¬ ced to the metallic state in a dendritical or capillary form, exactly resembling native silver. A L O G Y. cial, or crystallized in equiangular six-sided prisms, he terminal faces being sometimes plane, and sometimes convex or concave the same prism truncated on its terminal edges, or terminated by a six-sided pyramid set on the lateral faces, and having its summit truncated ; in equiangular six-sided tables, or in very flat rhom¬ boids. Crystals small, and grouped together 5 surface smooth, sometimes drusy m, prisms longitudinally streak¬ ed ; lustre shining or resplendent j internal lustre shin¬ ing, or weakly shining; fracture conchoidal, sometimes uneven $ fragments rather sharp-edged. Colour iron-black, or steel or lead gray 5 soft j brit¬ tle. Spec. grav. 7.208. Chem. Char.—Before the blow-pipe it melts with dif¬ ficulty ; sulphur, antimony, and arsenic, are partially driven off, and there remains a button of metallic sil¬ ver, which is not very ductile, accompanied by a brown Constituent Parts. Silver Sulphur, Klaproth. 85 J5 100 100 100 Pari!, Classifoi tionJ '—V-i slag. Constituent Parts. Klaproth. Silver, 66.5 Sulphur, 12. Antimony, Iron, Cupper and arsenic, Earthy matters, Loss, 10 5 100.0 Localities, &c.—Vitreous silver is one of the most common silver ores. It is usually accompanied by heavy spar, calcareous spar, and fluor spar ; along with the other ores of silver and lead, cobalt and blende. It is found in Bohemia, Saxony, Norway, Siberia, and South America. 7. Species. Brittle Vitreous Silver Ore. VArgent Vitreux Aigre, Brochant, ii. 138. Eivfer.CAor.-—Found massive, disseminated, superfi- Localities, &c.—This is one of the richest silver ores; and it is usually accompanied by red silver ore, vitreous silver ore, some other metallic ores, and various earthy spars. It is pretty common in Saxony and Hungary, but less abundant than vitreous silver ore. It is also occasionally met with in most other silver mines. 8. Species. Red Silver Ore. Id. Kirw. ii. 122. Id. Broch. ii. 143. Argent Anti- monie Sulphurt, Hauy, iii. ^02. This is divided into two subspecies 5 dark red, and bright red silver ore. Subspecies 1. Dark Red Silver Ore. Exter. Char.—Found massive or disseminated, super¬ ficial, dendritical, or crystallized in equiangularsix-sided prisms, which is either terminated by a three-sided pyra¬ mid set on the lateral edges, or has its terminal edges truncated, or is terminated by an obtuse six-sided pyra¬ mid set on the lateral faces, and having the summit and lateral edges of the pyramid truncated 5 sometimes the summit of the pyramid is terminated by a second three- sided pyramid, and sometimes the lateral edges of t ic prism are bevelled. The crystals are small, and 'van ously grouped together, commonly smooth and resplen ent, rarely streaked •, intern al lustre weakly shining, 01 only glimmering, adamantine, often semimetallic j frac¬ ture usually uneven, sometimes conchoidal 5 fragments rather blunt-edged. , Colour between cochineal red and lead-gray, a'1 sometimes iron black } crystals' translucent $ in m asses opaque •, streak but weakly shining, between cochi nea^ mineralogy. lit I. jssifiea- red and crimson red; soft; brittle, and easily fran- soft j brittle. Spec. grav. 3.4 to 3.608. Chem. Char.—Soluble with effervescence in nitric acid', nearly infusible before the blow-pipe, but is ea¬ sily reduced with borax, which assumes a fine green co¬ lour. Constituent Parts. Pelletier. Copper, 66 Carbonic acid, 18 Oxygen, 8 Water, 2 Loss, 6 100 Localities, &c.—This variety of copper ore is not very abundant •, but it accompanies the other ores of copper, and other metallic ores, as those of lead, zinc, and iron. It is found in Bohemia, Norway, Siberia, and in the different mines of lead and copper in Bri¬ tain. The earthy variety is found in superficial layers on a slaty marl in Hessia, and it is also found superficial on sandstone in Thuringia. Sometimes the whole of the sandstone is impregnated with this earthy carbonate of copper, there called copper sand earth, or copper sand¬ stone. A similar sandstone, at Gourock near Green¬ ock in Scotland, was a few years ago dug out for the purpose of extracting copper.j 11. Species. Azure Copper Ore, or Carbonate of Copper. Bhie Calciform Copper Ore, Kirwan, ii. 129. L'A- %ur de Cuivre, Brochant, ii. 190. Cuivre Carbonate Bleu, Hauy, iii. 562. 12. Species. Malachite. Id. Kirwan, ii. 131. Id. Brochant, ii. ip?* This species is divided into two subspecies, fibrous and compact. Subspecies rt I. ssifica- wn. Subspecies i. Fibrous Malachite. Cuivrc Carbonate Vert Soyeux. Hauy, iii. 573, Exter. Char.—Rarely massive, sometimes disseminat¬ ed, but often superficial, and in the form of small ca¬ pillary or acicular crystals grouped together in different forms j lustre shining, or when massive glimmering ; internal lustre weakly shining, silky j fracture fibrous, straight, or radiated ; fragments blunt-edged. Colour, emerald or apple green $ opaque j streak of a lighter colour j soft 5 brittle, Subspecies 2. Compact Malachite. Exter. Char.—Sometimes found massive, dissemi¬ nated or superficial, but most frequently globular, bo- tryoidal, stalactitical, &c. ; surface rough or drusy, sometimes smooth, almost always dull, and rarely shin¬ ing } internal lustre dull or weakly shining ; fracture conchoidal 5 fragments rather sharp-edged or wedge- shaped. Colour emerald green, apple green, and blackish green; opaque j soft j brittle. Spec. grav. 3.57 to 3.64. Chem. Char.—Decrepitates before the blow-pipe, and blackens without fusion ; effervesces with acids j co¬ lours borax green, and communicates a blue colour to the solution of ammonia. Constituent Parts. Klaproth. Compact Malachite. Copper, 58 Carbonic acid, 18 Oxygen, 12.5 Water, 11.3 lao.o Localities, &c.—Both the fibrous and compact ma¬ lachites are^usually found in the same repository, and ac¬ companied with other ores of copper. They are found in Germany, but the finest specimens are brought from Siberia. Scotland affords fibrous malachite in small quantity, as at Leadhills and in Shetland. Mala¬ chite is also met with in Cornwall and Derbyshire in England. -Malachite, when pure, is sometimes employ¬ ed as a pigment. The compact variety is susceptible of a fine polish ; which, with its beautiful and delicate colours, has brought it into much estimation lor various ornamental purposes. The largest and finest specimen of compact malachite known, is in the cabinet of Dr Guthrie at Petersburgh. It is 32 inches long, 17 broad, and two inches thick. It is estimated, according to the account of Patrin, who describes it, at 20,000 francs, above 800I. sterling. If we are rightly informed, this splendid mass of malachite was once offered to sale in Britain, but, having found no purchaser, was carried back to Russia. 13. Species. Green Copper Ore. ■Mountain Green, Kirw. ii. 134. Id. Broch. ii. 203. Exter. Char.—Found massive or disseminated, but 229 usually superficial on other ores j dull 5 fracture con- Metallic choidal or uneven ; fragments blunt-edged. ores. Colour verdigris green, emerald green, sometimes' sky blue, opaque, or translucent at the edges j soft, or friable j brittle. Chem. Char.—Becomes black before the blow-pipe without fusion. Colours borax green. Constituent Parts.—Supposed to be a mixture of oxide of copper, or according to others, a carbonate, with alu¬ mina and lime. Localities, &c—It is usually accompanied by gray copper ore, and some other copper ores, particular¬ ly with malachite, and sometimes with iron ochre, alumina, and quartz. Found in Saxony, Hungary’ and Siberia. 6 Jr 14. Species. Ferruginous Green Copper Ore. This is divided into two subspecies j 1. earthy ; and, 2. slaggy. Subspecies 1. Earthy Ferruginous Green Copper Ore. Iron-shot Mountain Green, Kirw. ii. 155. Id. Broch. ii. 205. Exter. Char.— Found massive, but most frequently- disseminated ; dull, with an earthy fracture j fragments bhmt-edged. Colour light olive green ; soft, friable ; brittle j mea¬ gre to the feel.. Subspecies 2. Slaggy Ferruginous Green Copper Ore. Glassy Iron-shot Mountain Green, Kirw. ii. 152. Exter. Char.—Massive, or disseminated 5 lustre shin- ^nl?> vitreous j fracture conchoidal 5 fragments sharp- edged. Colour deep olive green, sometimes black ; soft: brittle. Constituent -Seems to be a mixture of oxide of copper with iron ochre, in variable proportions. Localities, &c.—Found along with other copper ores, and is accompanied by iron ochre, heavy spar and quartz. It is a rare mineral. Has been found in Sax¬ ony, and it is said in the Hartz. 15. Species. Micaceous Copper Ore, or Arseniate of Copper. Olive Copper Ore, Kirw. ii. 151. Le Cuivre Arsenical, Broch. ii. 208. Cuivre Arseni atl, Hauy, iii. 575. Ar- seniatcof Copper, Bournon, Phil. Trans. 1801. p. 193. This species is divided into two subspecies, foliated and lenticular. Subspecies 1. Foliated Micaceous Copper Ore. Exter. Char.—Found massive, disseminated, or cry¬ stallized in oblique four-sided prisms, in six-sided prisms, in acute rhomboids, or in very small cubes. These cry¬ stals are also variously modified j lateral faces streaked longitudinally ; lustre resplendent, pearly, or adaman¬ tine ; fracture foliated, sometimes conchoidal. Colour olive green, sometimes emerald green, or ver¬ digris MINERALOGY. mineralogy. 3 3° - Metallic digris green •, translucent j crystals semitransparent $ Ores. soft. Spec. grav. 2.54. * Subspecies 2. Lenticular Micaceous Copper Ore. Extcr. Char.—This variety is found crystallized in octahedrons, composed of two four-sided pyramids, with isosceles triangular faces 5 crystals small 5 extei nal lustre shining; fracture foliated. Colour sky blue, or verdigris green ; scratches calca¬ reous spar; brittle ; easily frangible. Spec. grav. 2.88. Chem. Char.—The crystals of these varieties decre¬ pitate before the blow-pipe, and give out the odour ot arsenic. They melt into a grayish globule, which being treated with borax, yields a button of copper. Constituent Parts. Vauquelin. Oxide of copper, Arsenic acid, s Water, Loss, 39 43 i7 i 100 100 -TOO IOO Oxide of iron, — copper, Arsenic acid, Silica, Water, Loss, Chenevix. 27.5 22.5 33-5 3* 12. i*5 100.0 Part iL lateral edges ; surface of the crystals suiooth and re- C!assi£?Jf* splendent; lustre adamantine ; fracture foliated ; frag- tion. 1 1 ments rather sharp-edged. Colour between emerald and leek green ; opaque; crystals a little transparent; soft; streak pale apple green. Spec. grav. 3.57 to 4.43. Chem. Chai'.—-Thrown on burning coals, it commu¬ nicates a green colour to the flame ; soluble in nitric acid without effervescence. Constituent Paris. Proust. Oxide of copper, Muriatic acid, Water, 76.6 10.6 12.8 100.0 70.6 11.4 18.1 100.0 Klaproth 73* 10.1 16.9 100.0 Localities, &c.—These varieties of copper ores are very rare ; and have been hitherto discovered only in the Carrarach mine, Cornwall, accompanied by brown iron ore and other copper ores. Other arseniates ol copper have been described by Bournon. In many respects they resemble the prece¬ ding varieties. The spec. grav. which is 4.28, is consi¬ derably greater, and yet the proportions of the constitu¬ ent parts approach very near. Constituent Parts. Chenevix. Haematitiform. Capillary. Foliated. ' Oxide of copper, 50 51 54 Arsenic acid, 29 - 29 30 Water, 21 18 16 Loss, —• 2 — Localities, &c.—This mineral has been found in the sand of rivers, accompanied by quaTtz, schorl, copper and iron ores, near Itemolinos in Chili. It has also been found in a similar situation in Peru. Phosphate of Copper.—This mineral has been found massive, or crystallized in oblique six-sided prisms, with convex faces, lining cavities; lustre resplendent, between vitreous and adamantine ; internal lustre silky ; fracture fibrous. Colour grayish black, but internally emerald green ; opaque ; streak apple green ; soft, or semihard. . Constituent Parts. Klaproth. Oxide of copper, Phosphoric acid, Loss, 68.13 3°*95 .92 100.00 Count de Bournon has described another, under the name of oupromartial arseniate, which is also crystal¬ lized, has a spec. grav. 3.3, and the following are its constituent parts. 16. Species. Muriate of Copper, or Green Sand of Peru. Id. Broch. ii. 149. Id. Broch. ii. 545. Char. Exter.—Found massive, or crystallized in very small six-sided prisms, bevelled at the extremities, or in small oblique four-sided prisms, also bevelled at the extremities, but the sides corresponding to the obtuse Localities, &c.—This mineral has been found near Bologne, along with malachite, in a white drusy quartz. Copper Mines.—In addition to the history of copper ores now given, we shall just name some of the more celebrated copper mines in the world. The copper mines of Spain are situated on the frontiers of Portugal, and yield from veins of considerable thickness, yellow pyrites. France possesses copper mines in the Pyrenees, near Lyons, in Vosges, and in the neighbourhood of Savoy, in the department of Mont Blanc. There are extensive copper mines in Piedmont, which have been wrought to a very considerable depth. The copper mines of Cornwall in England, which are in primitive rocks, have been long celebrated. Ihe most abundant ores are copper pyrites, accompanied by native copper, which latter, it is observed, is most usu¬ ally found near the surface. The same mines yield all the varieties of arseniate of copper. The Acton copper mines on the borders of the counties of Derby and Staf¬ ford are situated in limestone, in very declining or near¬ ly perpendicular beds ; but the richest copper mines in England are those of the island of Angleeea, where is a mass of pyritous copper ore of immense thickness, yielding from 16 to 40 per cent, of copper. Native copper is also found near the surface, and immediately under the turf. Ihe art I. M I N E E The mines of Cronebane, in the county of Wicklow in Ireland, are very considerable. They are situated in a primitive mountain, composed of llinty slate and argillaceous schistus, which alternate with beds of stea¬ tites. In Germany, Hungary, Sweden, Norway, and Sibe¬ ria, there are many extensive and valuable copper mines. In the eastern parts of the Asiatic continent, in the island of Japan, in China, and in some of the islands of the Indian ocean, rich copper ores are abundant. Africa, in various places of that extensive region, abounds with ores of copper, as in the mountains to the north of the Cape of Good Hope. On the western coast of Africa, the natives dig out copper ore, and are acquainted with the mode of extracting it. In North America masses of native copper have been found, near Hudson’s Bay ; but the richest copper mines in the world are those of South America, and particu¬ larly in Chili, from which masses of native copper of immense magnitude have been obtained. The cop¬ per mines of Peru and Mexico are also wrought to great advantage. VI. IBQN Genus. i. Species. Native Iron. Li Kirw. ii. 156. Id. Brochant, ii. 215. Id. Hauy, iv. 1. Exter. Char.—Found massive or branched *, surface smooth, shining $ internal lustre shining, metallic j frac¬ ture hackly 5 fragments rather sharp-edged. Clour light steel gray, or silvery white j semi- hard j streak shining j perfectly ductile j flexible j but not elastic. Localities, &c.—The existence of native iron as a terrestrial production still remains doubtful. It is said that it has been found along with other ores of iron, in Saxonyand in France. Theonlyinstanccs fully establish¬ ed of the discovery of native iron, are those of the im¬ mense mass found by Pallas in Siberia, which amounted to no less than i68olb. or 15 cwt. and another of 3 cwt. which was discovered by Rubin de Celis in South Ame¬ rica 5 but theSe masses correspond so nearly with the substances which are certainly known to have fallen from the atmosphere, in their constituent parts, that it seems extremely probable they have had a similar ori¬ gin. But for a full account of this curious subject, see Meteorolite. 2. Species. Iron Pyrites. Martial Pyrites, Kirwan ii. '76. Id. Brochant, ii. 221. Fcr sulfure, Hauy, iv. 65. Subspecies i. Common Iron Pyrites. Exter. Char.—I ound massive or disseminated, super¬ ficial, or in imitative forms, and frequently crystallized.. I he torms are, a perfect cube with plane or convex faces j or with truncated angles, or edges 5 or having a three-sided pyramid on each angle \ the perfect octa¬ hedron, or truncated on all its angles 5 the dodecahe¬ dron with pentagonal faces, or wuth six opposite and pa¬ rallel edges truncated, or truncated on eight of its an¬ gles 5 or the perfect icosahedron, which is rare. A L O G Y. Crystals small, excepting the cube, and grouped to¬ gether j surface smooth or streaked; lustre shining, re¬ splendent j internal lustre shining, metallic j fracture1 uneven j sometimes conchoidal 5 fragments rather sharp- edged. Colour bronze yellow, golden yellow, sometimes steel gray 5 opaque j hard ; brittle 5 rather easily frangible. Spec. grav. 4.6 to 4.83. Chetn. Char.—Before the blow-pipe it gives out a strong sulphureous smell, and burns with a bluish flame j a brownish globule is then obtained, which is attracted- by the magnet. Constituent Parts. Hatchett. Sulphur, Iron, 47-85 100.00 52.5 47-5 100.0 Some varieties of common iron pyrites contain a mix¬ ture of gold, which is supposed to be accidental, as the external characters are not aflected by it, and it is only recognized by chemical analysis. These varieties are called auriferous pyrites. Subspecies 2. Radiated Iron Pyrites. Exter. Chur.—Found massive, or in different imita¬ tive forms, and also crystallized in small cubes or oc¬ tahedrons } surface smooth or drusy j lustre shining or resplendent j fracture radiated j. fragments wedge- shaped. Colour bronze yellow, lighter than the former ; some¬ times steel gray, and sometimes tarnished 5 hard 5 brit¬ tle, and easily frangible. Subspecies 3. Capillary Iron Pyrites. Exter. Char.—Found in small, capillary, or aciculai crystals, having the appearance of flocks of wool; some¬ times the crystals are acicular or in a stellated form $ lustre shining or weakly shining, metallic. Colour bronze yellow, approaching to steel gray. Subspecies 4. Hepatic Iron Pyrites. Exter. Char.—Massive or disseminated, or in diffe¬ rent imitative forms, as stalactitical,cellular,&c. 5 some¬ times crystallized in perfect six-sid|d prisms or in six- sided tables, which are either perfect or bevelled on the terminal faces. Crystals small, sometimes smooth y sometimes drusy 5 internal lustre glimmering, or weakly shining; fracture even, or imperfectly conchoidal 5 frag¬ ments sharp-edged. Colour bronze yellow, steel-gray, sometimes brownish or tarnished ; streak shining; hard; brittle. Physical Char.—By rubbing gives out a sulphureous odour, and, according to some, the smell of arsenic. Constituent Parts.—According to some mineralogists this variety is composed of sulphur and iron, with a por¬ tion of arsenic. Localities, See.—The first variety is universally dif¬ fused j it is found in every kind of rock, and often in great abundance. The second is rarer; but is not uncommon in veins of lead and silver, and sometimes in nests in indurated marl. It is found in Saxony and Bohemia, in Derby¬ shire. 231 Metallic Ores. 232 mineralogy. Part II shire in England, and at Eeadhills and the island of Islay in Scotland. This variety is more subject than the hrst to decom¬ position. Capillary pyrites is only found in small quantity, as in Saxony, and Andreasberg in the Hartz. Hepatic pyrites is only found in veins, particularly those of silver and lead, accompanied with quartz, cal¬ careous spar, and heavy spar, as in Germany and Sibe¬ ria, and at Wanlockhead in Scotland. Exposed to the air, this variety is extremely liable to decomposition. 3. Species. Magnetic Pyrites. Id. Kirwan, ii. 79* Brochant, ii. 232. Exter. Char.—Massive or disseminated; internal lus¬ tre shining or weakly shining; fracture uneven, rarely conchoidal ; fragments rather sharp-edged. Colour between copper red and bronze yellow; when exposed to the air it becomes brownish or tarnished ; hard, or semihard ; brittle. Spec. grav. 4.5I* Phys. Char.—This variety of pyrites acts on the magnetic needle, but not very powerfully. Chem. Char.—Before the blow-pipe it gives out a slight odour of sulphur, and melts easily into a grayish black globule, which is attracted by the magnet. Constituent Parts. Hatchett. Iron, 63.5 Sulphur, 36*5 100.0 Localities, &c.—Magnetic pyrites has been only found in primitive rocks, as in micaceous schistus; and is usually disposed in beds, along with other ores of iron, and accompanied by quartz, hornblende, and gar¬ nets. It is found in Saxony, Bavaria, Bohemia, and in Caernarvonshire in Wales. Uses.—This, as well as the former species, is em¬ ployed for the purpose of extracting sulphur, or of ma¬ nufacturing copperas, or sulphate of iron. Colour iron-black, perfect black, or steel-gray; streak Classifies brownish black ; semihard, or hard ; brittle.; more or tion. less easily frangible. Spec. grav. 4.2 to 4.93. \r-> Subspecies 2. Arenaceous Magnetic Iron Ore. Exter. Char.—Found in rounded grains, from the size of millet to that of a nut, and sometimes in small octahedral crystals ; external surface rough or weakly glimmering; internal shining or resplendent; fracture conchoidal; fragments sharp-edged. Colour deep iron black, sometimes ash-gray. P/it/s. Char.—Magnetic iron ore, as the name im¬ ports, strongly attracts the magnetic needle, and iron filings; to the compact varieties of this ore, in which this property was first discovered, the name of natural magnet is given. Chem. Char.—Magnetic iron ore becomes brown be¬ fore the blow-pipe, and colours borax dark green. Constituent Parts.—This is supposed to be an oxide of iron in considerable purity, as it yields from 80 to 90 per cent, of metallic iron. Localities, &c.—Common magnetic iron ore is very common in primitive mountains, particularly in those of gneiss and micaceous sebistus, where it forms very powerful beds, and even entire mountains. It is dis¬ seminated in crystals in chlorite schistus, as in Corsica, and in basalt and greenstone, at Taberg in Sweden. Found in Saxony, Bohemia, and Italy, and particular¬ ly in the island of Elba in the Mediterranean ; and in¬ deed is very universally distributed over every part of the globe. The second variety, or magnetic sand, is found in the beds of rivers, in a loose state, and sometimes im¬ bedded in basalt and wacken. It is found in those countries where the other ores of iron abound ; and also in the sand of many of the rivers within the torrid zone, as in Jamaica, St Domingo, &c. Uses.—Magnetic iron is wrought for the purpose of obtaining metallic iron. Most of the Swedish iron ores belong to this variety, and furnish the iron which is so celebrated on account of its superior qualities, through¬ out Europe. Magnetic sand, where it is abundant, is also smelted as an iron ore. 4. Species. Magnetic Iron Ore. ^ Species. Specular Iron Ore. Magnetic Ironstone, Kirwan, ii. 158. Id Brochant, Broch. ii. 242. Id. Kirw. ii. 162. Micaceous Iron ii. 235. Fer Oxidule, Haiiy, iv. 10. Ore, ibid. 284. Fer Oligiste, Hauy, iv. 38. 'Ihis is divided into two subspecies, common and are- This species is divided into two subspecies, common naceous. an 66. Oxygen, 28.5 Silica, 4*25 Alumina, j.gy Subspecies 4. Red Ochre. Id. Kirw. ii. 171. Id. Broch. ii. 256. Exter. Char.—Found massive, disseminated, or su¬ perficial 3 dull 3 fracture earthy. Colour between blood-red and brownish-red 3 stains much ; soft; often friable. Localities, &c.—This variety usually accompanies the former, and is a very fusible iron ore.( 100.00* f0' localities, &c.—A rare mineral, usually incrusting '• other ores of iron. Found in Germany, and in Corn¬ wall and at Ulverstone in Lancashire in England. ^OL. XIV. Parti. s t 7. Species. Brown Iron Ore. This is divided into four subspecies 5 1. brown iron froth 5 2. compact; 3. brown haematites; and, 4. brown ochre. Subspecies 1. Broivn Iron Froth. Brown Scaly Iron Ore, Kirw. ii. 166. Le Eisenrahm brun, Broch. ii. 258. C g Exter, 233 Metallic Ores. 234 Metallic Ores. miner Ex ter. Char.—Massive or disseminated, often super¬ ficial, or spumiform j strongly glimmering or shining } fracture foliated or compact. Colour between brown and dull gray very sott 5 al¬ most friable; stains j feels greasy j nearly swims on W£CW Char.—Blackens before the blow-pipe with¬ out fusion. ... Localities, &c.—Accompanies other iron ores, as m Saxony, but is rare. A L O G Y. Part Chem. Char.—Before the blow-pipe it blackens with- Classifies out fusion. *1 • • > t‘°n' Constituent Ports.—According to Bergman, this mi-' neral contains equal parts of carbonate of lime and of iron, with about one-fourth of manganese. Localities, &x.—Found equally in primitive a.nd stra¬ tiform rocks, and always accompanied by calcareous spar, and other ores of iron, as in Saxony, France, Bri¬ tain and Ireland. p. Species. Black Iron Ore. Subspecies 2. Compact Brown Iron Ore. E.vter. Char.—Massive or disseminated, sometimes in different imitative forms 5 dull, or rarely glimmering j fracture smooth, earthy, or conchoidal. Colour clove brown, or brownish yellow $ streak yel¬ lowish brown j semihard j-brittle. Spec. grav. 3.07 to ^Localities, &c.—In veins or beds, accompanied by other iron ores, in various parts of the woild. Subspecies 3. BROWN HAEMATITES. Id. Kirw. ii. 167. Id- Broch. ii. 268. This species is divided into two subspecies : I. com¬ pact j and 2. black haematites. Subspecies 1. Compact Black Iron Ore. Evter. Char.—Massive, orinvarious imitative forms; surface rough or dull; internal lustre glimmering ; frac¬ ture flat conchoidal ; fragments sharp-edged. Colour between steel gray and bluish-black ; semi¬ hard ; brittle. Id. Kirw. ii. 163- Id’ Broch. ii. 261. Exter. Char.—Massive, but most frequently in dif¬ ferent imitative forms; surface smooth, granulated, rough or drusy •, lustre shining; internal lustre glim¬ mering or weakly shining ; fracture fibrous ; fragments splintery or wedge-shaped. . Colour clove brown ; blackish brown, sometimes yel¬ low, and sometimes with tarnished colours -, opaque ; streak yellowish brown ; semihard ; brittle. Spec. giav. 3.78 to 4s02. . . Localities, Sec.—Always accompanies the preceding variety, but in smaller quantity. Subspecies 2. Black Haematites. Exter. Char.—Massive or kidney-form ; internal lustre glimmering and shining ; fracture fibrous, some¬ times even ; fragments wedge-shaped. Colour steel gray. . Constituent Parts.—This ore is supposed to contain a larger proportion of manganese, with alumina and lime, than other ores of iron. # ... Localities, &c.—Found in veins in primitive moun¬ tains, and sometimes also in stratiform mountains, ac¬ companied by brown and sparry iron ore. Subspecies 4. Brown Ochre. Id. Kirw. ii. 167* Id- Broch. ii. 263. Exter. Char.—Massive or disseminated ; dull ; frac¬ ture earthy •, fragments blunt-edged. Colour yellowish brown, or ochre yellow ; so t ; sometimes friable ; stains more or less. Localities, &c.—Always accompanies compact brown iron ore, and is therefore found in similar places. 8. Species. Sparry Iron Ore. Id. Brochant, ii. 264. Id. Kirw. ii. 190. Exter.Char.—Massive, disseminated, sometimes w’ith impressions, and often crystallized. Its forms are, the rhomboid with plane or convex faces, or having two opposite angles strongly truncated; and the lens, the equiangular six-sided prism, or the simple or double four-sided pyramid. Crystals, small; surface smooth, sometimes drusy, sometimes a little rough ; lustre shin¬ ing and somewhat metallic ; internal lustre shining, rare¬ ly resplendent, between pearly and vitreous ; fracture foliated; fragments rhomboidal. Colour yellowish gray, grayish white, and exposed to ihe air, blackish brown, or with tarnished colours; sometimes translucent at the edges ; those of a dark co¬ lour, opaque ; semihard, or soft; brittle. Spec. grav. 3.6 to 4. 10. Species. Argillaceous Iron Stone. This is divided into six subspecies: 1. red chalk; 2. columnar argillaceous iron stone; 3. granular; 4. common ; 5. reniform ; and, 6. pisiform. Subspecies 1. Red Chalk. Id. Broch. ii. 271. Exter. Char.—Massive ; fracture slaty; lustre glim¬ mering ; cross fracture earthy, dull; fragments in plates, 01 Colour ^brownish red, black or blood red ; streak blood red; writes and stains ; soft; adheres to e tongue ; feels meagre. Spec. grav. 3.13 to 3-93' Ghent.Char.—Decrepitates, and becomes black when exposed to a red heat. . , . • Localities, &c.—Usually accompanies clay slate, ei¬ ther in thin beds, or in masses, as at Tbalitter m «<- sia, where it is dug out in considerable quantity, also found in Bohemia and Saxony. < - _ Uses.—Employed as crayons in drawing, amt ior this purpose it is dug out, rather than as an ore U5 5- •5 100.0 brittle; adheres to the tongue ; feels meagre. Specific gravity 2.57. Localities, &c.—Found in Bohemia, Saxony, Silesia, and Poland, and in the coal countries of England and Scotland, and almost always in clay beds, sometimes accompanied with bituminous wood, in stratiform moun¬ tains. Phis variety was formerly called cetites or eagle-stone, as it was supposed that the eagle carried it to its nest. Subspecies 6. Pisiform Iron Stone. Id. Kirw. ii. 178. Id. Broch. ii. 280. Exter. Char.—In spherical or flattened particles, which are generally small; surface rough, dull; internal lustre glimmering or weakly shining ; fracture smooth. Colour between brown and red ; streak yellowish brown ; semihard ; brittle. Spec. grav. J.2. Constituent Pat'ts. Vauquelin. Iron, 30 Oxygen, 18 Alumina, 31 Silica, ij Water, 6 100 Localities, &c.—-This variety is found in consider¬ able, beds in stratiform mountains. It is abundant in France, Switzerland, and some parts of Germany. 11. Species. Bog Iron Ore. This is divided into three subspecies : r. morassy; 2. swampy; and 3. meadow. Subspecies 1. Morassy Bog Iron Ore. Id. Kirw. ii. 183. Id. Broch. ii. 283. Exter Char.—Sometimes earthy, sometimes in amor¬ phous, tuberculated,or corroded masses; fracture earthy. Colour yellnwish-brown ; stains; soft; friable; feels meagre. Subspecies 2. SWAMPY IRON Ore. Id. Kirw. ii. 138. Exter. Char.—In amorphous masses, which are tu¬ berose or corroded ; dull or slightly glimmering ; frac¬ ture earthy ; fragments blunt-edged. Colour dark yellowish-brown, blackish brown, or steel-gray ; streak light yellowish brown; very soft; brittle ; heavier than the former. Subspecies 3. Meadow Iron Ore. 235 Metallic Ores. Subspecies 5. Keniform Iron Stone. Id. Broch. ii. 278. Nodular Iron Ore, Kirw. ii. 178. , Enter. Char.—Found in rounded or tuberculated pieces, of a kidney-form figure ; surface rough, covered wita earthy particles ; internal lustre glimmeiing; frac- "ture smooth or earthy ; fragments rather sharp-edged; composed of lamellar and concentric distinct concretions, including a nodule which is usually moveable. Colour yellowish brown ; streak the same; soft; Id. Kirvv. ii. 182. Id. Broch. ii. 284. Exter, Char.—In kidney-form, tuberose, often cor¬ roded masses ; externally dull or rough ; internal lustre shining, resinous ; fracture conchoidal, or earthy when it is dull; fragments rather blunt-edged. Colour dark blackish-brown, or yellowish-brown; streak yellowish-brown ; soft and brittle. Constituent Parts.—Bog iron ore is an oxide of iron, combined with the phosphate of iron, with some earthy matters, as alumina and silica. G g 2 Localities, 23 out a sulphureous smell. Constituent Parts. Klaproth. Part [j Chem. Char.— Becomes brownish red before the Classifier blow-pipe, then decrepitates strongly, but is infusible. tion. Const. Parts.—According to Klaproth, it is compo- '“•“V"' sed of 63 of tin in the 100, with a little iron and arsenic. Localities, See.—Found in Cornwall, in alluvial land, where it seems to have been deposited in a stalactitical form, accompanied by common tin. mineralogy. Tin, Copper, Iron, Sulphur, Earthy substances, 34 36 3 25 2 IX. BISMUTH Genus. 1. Species. Native Bismuth. Id. Kirw. ii. 264. Id. Broch. ii. 343. Id. Hauy, iv, 184. 100 Localities, &c.—This is a rare mineral, found on¬ ly in Cornwall, in a vein along with copper pyrites. 2. Species. Common Tinstone, or Oxide of Tin. Id. Kirw. ii. 197. Id. Brock, ii. 334. Hauy, iv. 137. Exter. Char.—Massive, disseminated, in rounded pieces or grains, and often crystallized in rectangular four-sided prisms, which are variously modilied by trun¬ cations and bevelments j m octahedrons, which aie rare j in eight-sided prisms, or in double octahedrons, which are so united by one of their summits as to form a re-entering angle. Crystals of various sizes, always grouped together j surface smooth 5 lustre shining or resplendent $ internal lustre shining, between vitreous and resinous 5 fracture uneven. Colour brownish black, blackish brown, yellowish gray, or grayish white j opaque, or semitransparent 5 streak light gray \ hard 5 brittle. Specific gravity 6.3 to 6.9. Chem. Char.—Before the blow-pipe it decrepitates, loses its colour, and is partially reduced to the metal¬ lic state. Constituent Parts. Klaproth. Tin, Iron, Oxygen, Silica, 77-5 •25 21.5 •75 100.00 Localities, See.—Found in Germany, in the East Indies, and particularly in Cornwall in England. It is not very universally distributed j but where it exists, it is deposited in granite, gneiss, micaceous schistus, and porphyry *, and either in masses, veins, or disse¬ minated in the rocks. Exter. Char.—Barely massive, bnt usually dissemi¬ nated in a plumose or reticulated form, and rarely crys¬ tallized, in small four sided tables or cubes ; lustre shin¬ ing or resplendent; frac ure foliated. Colour silvery white, inclining to red ; colours com¬ monly tarnished j soft j almost ductile. Specific gravity 9.02 to 9.82. Chem. Char.—Fusible almost in the flame of a candle; by increasing the heat it is volatilized j solu¬ ble with effervescence in nitric acid, and precipitated by water in the form of a white powder. Localities, &c.—Bismuth is a rare metal, found in veins in primitive mountains, accompanied by calcare¬ ous spar, heavy spar, and quartz, and commonly with gray cobalt, sometimes also with black blende and na¬ tive silver. Found in Saxony, Bohemia, France, and Sweden. 2. Species. Vitreous Bismuth Ore. Sulphurated Bismuth, Kirwan, ii. 266. Id. Brochant, ii. 346. Exter. Char.—Massive or disseminated, rarely crys¬ tallized in small imbedded capillary prisms; lustre shining or resplendent; fracture radiated or foliated. Colour between lead gray and tin white; stains a little; soft; easily frangible. Specific gravity 6.13 to 6.46. Chem. Char.—Easily fusible before the blow-pipe, with a sulphureous odour. Const. Parts.—Composed of bismuth about 60 per cent, and sulphur with a little iron. Localities, Sec.—Found in Bohemia, Saxony, and Sweden, and is usually accompanied by native bis¬ muth. 3. Species. Ochre of Bismuth. 3. Species. Grained Tin Ore, or Wood Tin. Id. Broch. ii. 340. Id. Kirw. ii. 298. E.vter. Char.—Found only in small pieces, rounded or angular; surface rough ; weakly shining; internal lustre glimmering; a little silky; fracture fibrous; fragments wedge-shaped. Colour hair brown of various shades ; streak yellow¬ ish gray; hard and brittle. Spec. grav. 5.8 to 6.4. Id. Kirwan, ii. 265. Id. Brochant, ii. 348. Exter. Char.—Rarely massive, commonly dissemi¬ nated on the surface of other minerals ; internally glim¬ mering ; fracture uneven or earthy. Colour yellowish gray, ash gray, or straw yellow, opaque; soft; sometimes even friable. Spec. grav. 4.37. Chem Char.—Very easily reduced before the blow¬ pipe to the metallic state; effervesces with acids. Constituent M I N E E Constituent Parts. Lampadius. Oxide of bismuth, 86.3 — iron, 5.2 Carbonic acid, 4.1 Water, 0.4 Loss, \ ^ 100.0 Localities, &c.—This mineral is very rare, and chief¬ ly found near Schneeberg in Saxony, along with native bismuth; and also in Bohemia and Suabia. X. ZINC Genus. 1. Species. Blende. Id. Brochant, ii. 350. Id. Kirwan, ii. 237. Zinc Sul fur d. Hauv, iv. 167. Tins species is divided into three subspecies ; yellow, brown, and black. Subspecies 1. Yellow Blende. Exter.C/iar.—Massive or disseminated, or sometimes crystallized in cubes or octabedrons, but they are so confused as to prevent the form beintr easily discovered. Surface smooth, resplendent; internal lustre resplen¬ dent, between adamantine and vitreous; fracture foli¬ ated ; cleavage six-fold ; fragments rather sharp-edged, or assume sometimes a dodecahedral form, which is the result of the complete cleavage. Colour dark sulphur yellow, olive green, or brown¬ ish red ; translucent, sometimes semitransparent; streak yellowish gray ; semi-hard ; brittle. Spec. grav. 4.04 to 4,16. e -t Chcm. Char.—Decrepitates before the blow-pine, and becomes gray, but is infusible. A L O G Y, parent; streak yellowish gray; semi-hard; Spec. grav. 4. Constituent Parts. Bergman. Zinc, 44 Sulphur, 17 Iron, ^ Silica, 24 Alumina, Water, brittle. 241 Metallic Ores. IOO Localities, &c.—\'ery common in veins of lead ore, in most parts of the world. Subspecies 3. Black Blende. Exter. Char.—Massive, or disseminated, or crystal¬ lized like the former, which it resembles in most of its characters. Colour perfect black, brownish black, or blood red ; often iridescent. Constituent Parts. Bergman. Zinc, 45 Sulphur, 29 Iron, ^ Lead, 5 Silica, 4 Water, 6 Arsenic, 1 100 Localities, Sic.—-Found in the same places with the former. Constituent Parts. Bergman. Zinc, 64 Sulphur, 20 Iron, (j Fluoric acid, 4 Water, 6 Silica, 1 100 Physical Char.—Most of the varieties of yellow Olende become phosphorescent by friction in the dark. Localities, &c.—Found in Saxony, Bohemia, Hun¬ gary and Norway, accompanied by lead, copper, and non ores. It is rather a rare mineral. Subspecies 2. Brown Blende. Exter. Char.—-Massive, disseminated, and sometimes crystallized in simple three-sided pyramids, octahe¬ drons, and four-sided prisms, which are variously modi- • External lustre shining or resplendent; surface sometimes drusy; internal lustre shining, between vi- -r Chem. Char.—Crystals decrepitate before the blow¬ pipe, but in powder is easily fusible. Const. Paj'ts.—Was formerly supposed to be a mu¬ riate of antimony, but according to Klaproth, it is a pure oxide. The white ore of France, according to Vauquelin, contains, Oxide of antimony, 86 • — lead, 3 Silica, 8 .Loss, 3 100 6. Species. Ochre of Antimony. Id. Brochant, ii. 383. Id. Kirwan, ii. 252. Exter. Char.—Massive, disseminated, or in superfi¬ cial crusts, on gray antimony ; dull; fracture earthy. Colour straw yellow’, or yellowish gray; soft; friable. Chem. Char.—Infusible before the blow-pipe ; be¬ comes white, and emits white fumes. Its constituents are unknown. Localities, &c.—In Saxony and Hungary, accom¬ panying gray and red antimony, and in the antimony mine near Westerhall, in the south of Scotland. XII. COBALT Genus. 1. Species. White Cobalt Ore. Id. Kirw. ii. 382. Id. Broch. ii. 386. Exter. Char.—Massive, disseminated, reniform, and rarely crystallized in small four-sided tables, or in small cubes or octahedrons. Lustre weakly shining, or shin¬ ing ; fracture uneven. Colour tin white, but on the surface variable, and tarnished ; streak shining; hard ; brittle. Chem. Char.—Easily fusible before the blow-pipe, emitting a dense vapour, with a smell of arsenic, and leaves a white metallic globule ; colours borax-blue. Localities, &c.—Found in Norway, Sweden, and Saxony, in beds of micaceous schistus, along with red cobalt ore, quartz, and hornblende. Its composition is not known, but supposed to be alloyed with some other metals. 2. Species. Gray Cobalt Ore. Id. Kirw. ii. 271. Id. Broch. ii. 388. Exter. Char.—Massive, disseminated, reniform, and botryoidal ; lustre shining; fracture even. Colour light steel gray, or tin white; surface steel tarnished ; streak shining ; semi-hard ; brittle. Chem. C/iar.—Infusible before the blow-pipe ; emit¬ ting fumes and the smell of arsenic. Constituent Parts. Klaproth. Cobalt, 20 Arsenic, 3 3 Iron, 24' Loss, 23 100 It contains also sometimes nickel and silver. Localities, &c.—Found in Saxony, France, Norway, and Cornwall in England, with other ores of cobalt. 3. Species. Shining Cobalt Ore. Id. Broch. ii. 390. Kirw. ii. 273. Exter. Char.—Massive, disseminated, superficial, in various imitative forms, and crystallized in cubes and octahedrons, which are variously modified ; crystals small, smooth, and resplendent, rarely drusy; lustre shining; fracture uneven, radiated, or fibrous. Colour tin white, commonly grayish, or yellowish tarnished; hard; brittle. Spec. grav. 6.3 to 6.4. Chem. Char.—Before the blow-pipe it burns with a small white flame, and a white vapour, smelling strong¬ ly of garlic ; then blackens, and is almost infusible; soluble in nitric acid. Constituent Parts of crystallized shining cobalt from Tunaberg in Sweden. Klaproth. Tassaert. Cobalt, 44. 36.66 Arsenic, 55.5 49. Sulphur, 5 6.5 Iron, 5.66 Loss, 2.18 100.0 JCO.O© H h 2 243 Metallic Ores. Localities, 244 miner Localities, &c.—This is the most common ore of cobalt j and it is usually accompanied by the other ores, and sometimes also by vitreous, red, and native silver. It is found in Bohemia, Saxony, Sweden, and Cornwall in England, and usually m beds m primitive mountains. , c Uses, This ore of cobalt is commonly wrought tor the purpose of employing it in the preparation of the line blue colour known by the name of smalt, which is used in the manufacture of porcelain, glass, and as a pigment. 4. Species. Black Cobalt Ochbe. Id. Broch. ii. 396. Kirw. ii. 273. Hauy, iv. 214. This is divided into two subspecies, friable and indu¬ rated. Subspecies 1. Friable Cobalt Ochre. Exter. Char.—Composed of particles which are more or less cohering j stains a little. Colour brownish, bluish, or grayish black j streak shining; feels meagre. In other characters it agiees with the following. Subspecies 2. Indurated Cobalt Ochre. Exter. Char.—Massive, disseminated, in imitative forms, or marked with impressions ; dull, or weakly glimmering ; fracture earthy. Colour bluish black ; streak shining, resinous ; soft; semihard ; rather brittle. Spec. grav. 2.01 to 2.42. Chem. Char.—Before the blow-pipe it gives out an arsenical odour, but is infusible. Its constituent parts are supposed to be oxide of co¬ balt, with some iron and arsenic. Localities, &c.— Both varieties are found together, and accompanied by ores of silver, copper, iron, in Saxony, Suabia, and the Tyrol, as well as in Iiance and Spain. 5. Species. Brown Cobalt Ochre. Id. Broch. ii. 400. Exter. Char.—Massive, or disseminated; always dull ; fracture earthy ; streak shining, resinous. Colour light or dark liver brown; soft, almost fri¬ able ; very easily frangible. Constituent Parts.— Supposed to be composed of oxide of cobalt and iron. Localities, &c.—Found at Saalfeld in Thuringia, in stratiform mountains, and in Wirtemberg, in pri¬ mitive mountains, accompanied by other varieties of cobalt ochre. 6. Species. Yellow Cobalt Ochre. Id. Kirw. ii. 277. Broch. ii. 401. Exter. Char.—Massive, or disseminated, or adhering to the surfaces of other minerals ; dull; fracture earthy; streak shining, resinous. Colour dirty straw yellow, or yellowish gray ; very soft or friable. Chem Char.—Before the blow-pipe it gives out an »dour of arsenic, and is infusible. 4 A L O G Y. Part Its constituents are supposed to be oxide of cobalt, Classify and a little arsenic. , don, Localities, &.c.—Found in the same places with the^’"'r“ former, but is rare. 7. Species. Bed Cobalt Ochre, or Arseniate of Co¬ balt. Id. Kirw. ii. 278. Broch. ii. Cobalt Arseniate, Hauy, iv. 216. This is divided into two subspecies ; earthy and ra¬ diated. Subspecies 1. Earthy Red Cobalt Ochre. Exter. Char.—In thin superficial layers, or crusts; dull, or weakly glimmering ; fracture earthy. Colour peach-blossom red, rose red, or reddish white; streak a little shining; very soft, friable. Localities, &c.—Found in Bohemia, Saxony, France, and Norway. Subspecies 2. Radiated Red Cobalt Ochre, or Cobalt Bloom, or Flowers oj Cobalt. Exter. Char.—Massive, or disseminated, rarely bo- tryoidal or reniform ; often superficial, and in small dru- sy crystals, whose forms are rectangular four-sided ta¬ bles, four-sided prisms, double six-sided pyramids, with different modifications. Crystals small and variously aggregated, smooth and shining, sometimes resplen¬ dent ; fracture radiated ; fragments wedge-shaped, or splintery. Colour peach blossom red, crimson red, or, exposed to the air, brownish, grayish, or whitish ; translucent; crystals semitransparent; soft; brittle. Chem. Char.—Before the blow-pipe becomes black¬ ish gray, giving out a feeble odour of arsenic, with¬ out any fumes, but is infusible. Colours borax a fine blue. This species has not been particularly analysed, but is considered as a compound of cobalt and arsenic acid. Localities, &c.—The same as the former, and also in Cornwall in England, and along with copper ores at Alva in Scotland. 8. Species. Sulphate of Cobalt. A saline substance in a stalactirical form, of a pale rose red colour and translucent, is found at Herren- grund near Newsohl in Hungary, which was at first sup¬ posed to be a sulphate of manganese, and afterwards a sulphate of cobalt. This substance has been examined by Klaproth, who dissolved it in water, added an alkali, and obtained a bluish precipitate, which coloured borax of a beautiful sapphire blue ; and with muriatic acid he obtained from it a sympathetic ink. XIII. NICKEL Genus. 1. Species. Copper coloured Nickel. Id. Brochant, ii. 408. Sulphurated Nickel, Kirw. ii* 286. Nickel Arsenical, Hauy, iii. 518. Kvpfer- nickel of the Germans. Exter. Char.—Massive or disseminated,rarelyreticu- lated; lated; shining, or weakly shining ; fracture uneven, sometimes conchoidal; fragments rather sharp-edged. Colour pale copper red, whitish, or grayish j semi- hard ; brittle. Spec. grav. 6.64 to 7.56. Chcm. Char.—Before the blow-pipe it gives out the fumes and odour of arsenic ; melts with difficulty into a slag, mixed with metallic particles. Solution in acids, green, Constituent Parts. Sage. mineralogy. 24s Nickel, Arsenic, Sulphur, Loss, 75 22 2 I IOO Localities, &c.—Found in veins, in primitive and stratiform mountains, almost always accompanied with ores of cobalt, and often with rich silver ores. It is found in Bohemia, Saxony, France, Spain, and Corn¬ wall in England. Colour steel gray, or iron black $ streak black, with- Metallic' out lustre j stains 3 soft 3 brittle. Specific gravity 3.7 Ores. Constituent Parts. Cordier and Beaunier *. Oxide of manganese, Brown oxide of iron, Carbone, Carbonate of lime, Barytes, Silica, Loss, From France. 83*5 2. 7-5 5-5 * Jow. de$ Mines, Germany. Piedmont. No. Iviii* 82. 7-5 3- 7- •5 86. 3* J-5 5- 4-5 p. 778. 100.0 100.0 100.0 Of purer specimens by Klaproth. Oxide of manganese, Water, Loss, 99-2J •25 •5 92-75 7- •25 100.0 100.00 2. Species. Nickel Ochre, or Oxide of Nickel. Id. Kirw. ii. 283. Broch. ii. 411. Hauy, iii. 516. Exter. Char.—Usually disseminated and efflorescent on other minerals ; composed of friable, loose, and slight¬ ly agglutinated particles. Colour apple-green of different shades 3 stains 3 feels meagre. Chem. Char.—Remains unchanged before the blow¬ pipe ; colours borax yellowish red, and is insoluble in nitric acid. Constituent Parts. Lampadius. Oxide of nickel, 67. iron, 23.2 Water, i.5 Loss, 8.3 Subspecies 2. Foliated Gray Ore of Manganese, Exter. Char.—Found massive, disseminated, or cry¬ stallized in small, rectangular, four-sided tables, fasci- cularly grouped 3 lustre shining 3 fracture foliated. Colour similar to the former 3 streak black and dull 3 stains 3 soft, and brittle. Spec. grav. 3.74. Subspecies 3. Compact Gray Ore of Manganese. Exter. Char.—Massive or disseminated, in angular, 01 botryoidal, or dendntical forms 3 lustre glimmerings fracture uneven, sometimes even or conchoidal. Colour steel gray, or bluish black 5 stains 5 semihard, or soft 5 brittle. Const. Parts—approach pretty nearly to those of the radiated variety. Subspecies 4. Earthy Gray Ore of Manganese. 100.0 Localities, &c.—Found in similar situations with the preceding species. XIV. MANGANESE Genus. 1. Species. Gray Ore of Manganese, or Oxide of Manganese. Id. Brochant, ii. 414. Id. Kirwan, ii. 291. Id. Hauy, iv. 243. This species is divided into four subspecies : 1. radi¬ ated ; 2. foliated 3 3. compact 3 and, 4. earthy. Subspecies 1. Radiated Gray Ore of Manganese. Essen Char.—Colours borax violet. Exter. Char—Massive or disseminated, or crystalli¬ sed in oblique four-sided prisms, or in acicular prisms aseicularly grouped together 3 the crystals are variously modified. Faces streaked longitudinally ; shining or re¬ splendent 3 fracture radiated 3 fragments wedge-shaped. Exter. Char.—Found massive, disseminated, some¬ times superficial and dendritical 3 dull 3 sometimes a little glimmering; fracture earthy. Colour between steel gray and bluish black 3 stains very much ; very soft, often even friable ; feels meagre. Constituent Parts—supposed to be the same as the former, but with a larger proportion of oxide of iron. them. Char.—Gray ore of manganese is infusible before the blow pipe, but becomes of a blackish brown colour; gives a blue colour to borax. Localities, Sec.——All the varieties of this species are usually found together, and chiefly in primitive moun¬ tains. The earthy ore of manganese almost always ac¬ companies sparry iron ore, and other ores of iron. Man¬ ganese is found in considerable abundance in Saxony, Bohemia, France, near Exeter in England, and in A- berdeenshire in Scotland. 2. Species. Black Ore of Manganese. Exter. Char.—Found massive, disseminated, or cry¬ stallized in small four-sided double pyramids, arranged 111 246 Metallic Ores fcm»,w» ■ , / - mineralogy. iii rows j sufface shining j internal lustre weakly glim¬ mering j fracture imperfectly foliated. Colour grayish black, and brownish black j streak dull, brownish red $ soft j brittle. Localities, &c.—This species is of rare occurrence. It has been found in Thuringia, forming a crust on gray ore of manganese, and also, it is said, in 1 led- mont. found in Bohemia, Saxony, Sweden, France, and Eng- ciassifiii land. don' XVI. ARSENIC Genus. ’ H 1, Species. Native Arsenic. Id. Broch. ii. 435. Id. Kirw. ii. 255. Id. Hauy, iv. 220. 3. Species. Red Ore of Manganese, or Carbonate of Manganese. Exter. Char.—Massive, disseminated, botryoidal, &c. or crystallized in flat rhomboids, or in very small pyra¬ mids or lenses. Surface of the crystals smooth j dull, or weakly glimmering; fracture uneven or splintery. Colour rose red, or brownish white $ translucent at the edges 5 semihard $ brittle. Spec. grav. 3.23. Chem. Char.—Infusible before the blow pipe; be¬ comes grayish black, and colours borax violet blue, or crimson red. Constituent Parts. Lampadius. Oxide of manganese, 48 ■ •— iron, 2.1 Carbonic acid, 49 -Silica, *9 Exter. C/jor.—Massive, disseminated, in imitative forms, or with impressions j surface rough or granula¬ ted-, dull, or weakly glimmering 5 internal lustre weak¬ ly shining j fracture uneven, sometimes imperfectly fo¬ liated ; fragments rather blunt-edged in plates. Colour light lead gray, tin-white or grayish black when tarnished 5 streak shining; semihard 5 very easily frangible. Spec. grav. 5.72 to 5-7^* Chem. Char.—Melts readily before the blow-pipe, giving out white vapour, with the smell of garlic j then burns with a bluish flame, and is dissipated, leaving on¬ ly a whitish pow-der, which is the oxide of arsenic. Constituent Pcrte.—Native arsenic is usually alloyed with a small portion of iron, and sometimes also with a little gold or silver. Localities, &c.—Found in veins in primitive moun¬ tains, accompanied by ores of silver, lead, copper, quartz, and earthy spars, in Bohemia, Saxony, and France. . 2. Species. Arsenical Pyrites. 100.0 r Localities, &c.—This species of manganese, which is rare, is found in I ransylvania at Offenbanya, and particularly at Nagyag, where it constitutes part of the masses of an auriferous vein, from which the gold ore of Nagyag is obtained. Id. Broch. ii. 438. Id. Kirw. ii. 256. Fer Arseni¬ cal, Hauy, iv. 56. This is divided into two subspecies, common and ar¬ gentiferous. Subspecies 1. Common Arsenical Pyrites. XV. MOL YB DEN A Genus. 1. Species. Sulphuret of Molybdena. Id. Brochant, ii. 432. Id. KirWan, ii. 322. Id. Hauy, iv. 289. E.vter. C/wr.-—Massive or disseminated, sometimes in plates, and rarely crystallized in equal six-sided tables} crystals small, imbedded, the lateral faces shining 5 in¬ ternal lustre shining; fracture foliated ; fragments ra¬ ther blunt-edged, sometimes in plates. Colour lead gray j opaque stains, and writes ; very soft, and easily frangible 5 flexible in thin plates, but not elastic feels greasy. Spec. grav. 4.56 to 4.73. Chem. Char.—Infusible before the blow-pipe •, gives out a sulphureous smell nitric acid converts it to a white oxide, which is the molybdic acid. Exter. Char.—Massive, disseminated, often crystal¬ lized in oblique four-sided prisms, acute octahedrons, and lenses} the prisms being variously modified on their angles, faces, and extremities. Crystals small ■, lateral faces smooth, shining •, bevelled faces streaked trans¬ versely j lustre shining 5 fracture uneven. Colour silvery white, but usually tarnished yellow, or bluish, and iridescent j hard 5 brittle. Specific gravi¬ ty 5.75 to 6.52. Phys. Char.—By friction gives out the odour of gar¬ lic. Chem. Char.—Before the blow-pipe gives out a white vapour with the odour of arsenic, the fumes depositing a white powder on cold bodies j a reddish brown mat¬ ter, which is infusible, remains. Constituent Parts.—Composed of arsenic, iron, and sulphur. Constituent Parts. Pelletier. Klaproth. Molybdic acid, 45 60 Sulphur, 55 40 ICO IOO Localities, &c.—Always found in primitive moun¬ tains, in nests or nodules, and very commonly in the neighbourhood of tin ores. It is also accompanied by wolfram, quartz, native arsenic, and fluor spar. It is Subspecies 2. Argentiferous Arsenical Pyrites. Exter. Char.—Rarely massive, often disseminated, and crystallized in small, acicular, four-sided prisms j lustre shining, or weakly shining ; fracture uneven. Colour tin-white, or silvery-white, usually tarnished. Localities, &c.-—Arsenical pyrites is found in Bo¬ hemia, Saxony, and Silesia, in veins of primitive moun¬ tains, or disseminated in the rocks. The second variety is found in similar places, and dif¬ fers only from the first, in being combined with a small quantity of silver, which varies from 1 to 10 per cent. 3. Species. rt I. MINER issifica* 0 , _ ion. 3* Species. Orpiment. Id. Kir. ii. 260. Id. Broch. ii. 444. Hauy, iv. 234. This species is divided into two subspecies, yellow and red. Subspecies 1. Yellow Orpiment. Exter. Char.—Massive,disseminated,superficial, and crystallized in oblique four-sided prisms, bevelled at the extremity, or terminated by a four-sided pyramid, or in acute octahedrons. Crystals small, and confusedly aggregated; surface smooth; that of the bevelment and pyramids finely streaked 5 internal lustre resplend¬ ent, between resinous and adamantine } fracture foliat¬ ed ; fragments in plates. Colour citron-yellow, gol den-yellow, or aurora-red ; translucent; in thin plates, semitransparent; soft; flex¬ ible in thin plates. Spec. grav. 3.31 to 3.45. Chem. Char.—Gives out a blue flame before the blow-pipe, with white vapour, and the smell of arsenic and sulphur. Constituent Parts. Kirwan. Arsenic, 84 Sulphur, 16 100 Westnimb. 80 20 100 Localities, &c.—Usually found in stratiform moun¬ tains, accompanied by clay, quartz, and sometimes by red orpiment, in Transylvania, Hungary, and other places. Ores. A L O G Y. 247 greenish white j opaque > cryotals translucent $ soft, or Metallic friable. Spec. grav. 3.706. Chem. Char.—Before the blow-pipe it gives out a white fume and a garlic odour ; burns with a bluish flame, and is entirely dissipated j soluble in water and acids. Constituent Parts.—This is a pure oxide of arsenic, with an accidental mixture of earth. Localities, &C.—A rare mineral, but is found in small quantity, along with native arsenic, and ores of cobalt, in Bohemia and Hungary. 5. Species. Pharmacolite, or Arseniate of Lime. Id. Broch. ii. 523* Chaux Arseniate, Hauy, ii. 293. Exter. Char.—PonnA. in small capillary crystals j lustre glimmering, silky 5 fracture fibrous or radiated. Colour snow-white j translucent; very soft. Specific gravity 2.53 to 2.64. Chem. Char. —Soluble in nitric acid with efferves¬ cence, and gives out the odour of arsenic before the blow-pipe. Constituent Parts. Klaproth. Arsenic acid, Lime, Water, 50-54 25- 24.46 100.00* Localities, &c.—Found in a vein in primitive rocks, accompanied by heavy spar and gypsum, near Wittichen in Suabia. It has also been found in France. * Analyl. Ess. ii. 33. Subspecies 2. Red Orpiment. Eocter. Char.—Rarely massive, usually disseminated, qr superficial, and often crystallized in oblique four¬ sided prisms, with obtuse lateral edges, truncated, or bevelled : crystals small, streaked longitudinally; shin¬ ing or resplendent ; internal lustre shining between vi¬ treous and resinous j fracture uneven, or conchoidal. Colour light aurora-red, scarlet-red, orange yellow; translucent or semitransparent, often opaque ; streak orange, or citron-yellow j very soft: somewhat brittle. Spec. grav. 3.2. Chem. Char.—Similar to the former. Constituent Parts.—According to some, the same as the preceding, but with the addition of iron and silica, with a smaller proportion of sulphur. Localities, &c.—Chiefly found in primitive moun¬ tains, as in Saxony, Hungary, France, and in the neigh¬ bourhood of’HUtna and Vesuvius. 4. Species. Native Oxide of Arsenic. Id. Kirw. ii. 258. Id. Broch. ii. 450. Id. Hauy, iv. 225. Exter. Char.—Found superficial in an earthy form, and friable, on other minerals ; rarely indurated, some¬ times botryoidal, or crystallized in capillary crystals, very small octahedrons, or four-sided tables; lustre glimmering or dull; fracture earthy or fibrous. Colour snow-white, yellowish white, reddish or XVII. TUNGSTEN Genus. I. Species. Wolfram. Id. Kirw. ii. 316. Id. Broch. ii. 456. Scheelin Per- rugine, Hauy, iv. 314. * Exter. C/zar.-—Found massive, disseminated, or cry¬ stallized in six-sided prisms, and in rectangular four¬ sided tables, which are variously modified. Crystals not very small, usually grouped; internal lustre shin¬ ing or resplendent; longitudinal fracture foliated ; cross fracture uneven. Colour brownish black, or perfect black, sometimes tarnished; opaque; streak dark reddish brown; soft; brittle. Spec. grav. 7.11 to 7.33. Chem. 67z«r.—Before the blow-pipe it decrepitates, but is infusible. Constituent Parts. Delhuyart. Wiegleb. Klaproth. Vauquelin. Tungstic acid, 63 35.75 Oxide of manganese, 22 ' 32. Oxide of iron, 13 u. Silica, ~ _ Loss, - 21.25 100 100.00 100.00 100.00 Localities, &c.—-AY olfram, which is a rare mineral, is found in primitive mountains, accompanied by quartz, and 46.9 67. - 6.25 31.2 18. I-5 21.9 7.25 248 Metallic Ores. and tin ores, in Bohemia, France, England. 2. Species. Tungstate of Lime. Tungsten, Kirvv. ii. 314* Broch. ii. 453. Scheehn Calcairc, Hauy, iv. 320. fixter. Char.—Massive, disseminated, sometimes cry¬ stallized in regular octahedrons, which are sometimes slightly bevelled on the edges of the common base. Crystals usually small } surface smooth, resplendent; bevelled surface streaked transversely j internal lustre shining or resplendent, resinous or adamantine 5 fracture foliated. Colour grayish or yellowish white j translucent j senu- bard •, brittle. Spec. grav. 6.06. Chem. Char.—Before the blow-pipe decrepitates, and loses its transparency, but is intusible. Reduced to powder, and digested with nitric or muriatic acid, it leaves a citron yellow residuum, which is tungstic acid. Constituent Parts. Klaproth. Part 2. Species. Octahedrite. Cla^1: Anatase, Hauy, iii. 1 29. Id. Brochant, ii. 548. Oc- "1" ^ tahedrite, Saussure, Voyages, § 1901. Exter. Char.—Found only crystallized, in elongated octahedrons with square bases, and truncated or acu¬ minated *, crystals small and imbedded ; lateral faces streake'd transversely j lustre resplendent, vitreous j fracture foliated. Colour steel gray, sometimes light indigo blue j trans¬ lucent j semi-hard ; brittle. Spec. gray. 3.85. Chem. Char.—Infusible before the blow-pipe, but melts with borax, which it colours green, and in cool¬ ing, crystallizes in needles. Const. Parts.—It is chiefly composed of oxide of ti¬ tanium. Localities, &c.—Has been found lining the cavities of a vein, accompanied by quartz and feldspar, in a primitive rock, in Dauphine in France. 3. Species. TitaNITE. mineralogy, and Cornwall in Oxide of tungsten, iron, manganese, Lime, Silica, Loss, 77*75 75*25 1.25 •75 17.6 18.7 3* J*5 1.65 2.55 100.00 100.00 Localities, &c.—This is a rare mineral, usually found in primitive mountains, accompanied by ores of tin, some iron ores, quartz, fluor spar, &c. in Sweden, Saxony, and Cornwall in England. XVIII. TITANIUM Genus, i. Species. Menachanite. Id. Brochant, ii. 468. Id. Kirwan, ii. 326. Hauy, iv. Id. Kirwan, ii. 329. Le Puthile, Brochant, ii. 470. Titane Oxide, Hauy, iv. 296. Rtd St norl of many. Exter. Char.—Found crystallized in oblique four¬ sided prisms, the lateral edges truncated 5 sometimes these crystals are double, being united obliquely j also in acicular and capillary crystals, imbedded and group¬ ed together \ surface longitudinally streaked, shining j internal lustre .shining, adamantine ; fracture foliated. Colour blood-red or reddish brown *, opaque, or trans¬ lucent *, hard *, brittle. Spec. grav. 4.1 to 4.24. Chem. Char.—Infusible before the blow-pipe, but loses its transparency, and becomes gray. Const. Parts.—Composed chiefly of oxide of tita¬ nium. Localities, &c.—Found in Hungary, in gneiss, and imbedded in quartz. It has been found also in Switzer¬ land, Spain, and France. 3°5* Exter. Char.—Found in small, detached, rounded grains *, surface rough, or weakly glimmering; lustre shining, semi-metallic ; fracture imperfectly foliated. Colour grayish or iron black 5 soft or semi-hard j brittle. Spec. grav. 4.4. Chem. C/mr.-—Infusible before the blow-pipe *, co¬ lours borax greenish brown. Constituent Parts. Chenevix. Klaproth. Oxide of titanium, 45 25 40 iron, 51. 49 Silica, 3.5 11 Oxide of manganese, 2.5 «= 100.00 100 Localities, 8>cc.—-This mineral was first discovered by Mr Gregor, among sand, in the bed of a rivulet, in the valley of Menachan in Cornwall *, hence its name. It has since been found in the island of Providence, one of the Bahamas, and at Botany Bay in New Hol¬ land. 4. Species. NlGRINE. Kirwan, ii. 331. Brochant, ii. 474. Hauy, iv. 307. Exter. Char.—Disseminated, sometimes amorphous, often crystallized in oblique four-sided prisms, variously modified by truncations and bevelments. Surface smooth j lustre shining, or resplendent, between resinous and vi¬ treous 5 fracture foliated. Colour dark brownish black, yellowish white or vio¬ let brown ; opaque, or translucent j semi-hard. Spec, grav. 3.51 to 4.6. Chem. Char.—Infusible before the blow-pipe. Constituent Parts. Oxide of titanium, Silica, Lime, Klaproth. 33 35 32 Abilgaard. 58 22 20 74 8 18 Localities, in Norway. 100 100 gtc.—-Found in Bavaria, and at Arendat 5. Species. lift I. assificft- ition. 5. Species. Erown Ore of Titanium. ^ This species in its characters so nearly resembles the preceding, that it may be considered merely as a varie¬ ty, as has been done by Brochant and Hauy. 6. Species. Iserine. Id. Brochant, ii. 478. Exter. Char.—Found in rounded or angular grains, having a rough and glimmering surface j internally shining \ fracture conchoidal. Colour iron black, or brownish ; hard j brittle. Spec, grav. 4.5. Chan. Char—Melts before the blow-pipe into a dark brown slag. Constituent Parts. Klaproth. Oxide of titanium, $g.i iron, 30.1 uranium, 10.2 Loss, 100.0 Localities, &c—Found in the sand of a river in Bo¬ hemia, called Iscr, whence the name is derived. XIX. URANIUM Genus. 1. Species. Pitchy Ore of Uranium. Id. Brochant, ii. 460. Kirw. ii. 305. Hauy, iv. 280. Exter. Char.—Massive, disseminated, sometimes cellular ; shining or glimmering •, fracture imperfectly conehoidal 5 fragments rather sharp-edged. Colour velvet black, iron black, or bluish, some¬ times steel-tarnished j streak black ; opaque j semi- hard ; brittle. Spec. grav. 6.5 to 7.5. Ghent. Chat'.—Infusible before the blow-pipe 5 solu- able in nitric acid. Constituent Parts. Klaproth. Uranium a little oxidated, 86.5 Sulphuret of lead, 6. Oxide of iron, 2.5 Silica, 5. 100.0 Localities, See.—Found in Bohemia and Saxony, ac¬ companying galena, copper pyrites, iron ochre, and some ores of silver and cobalt. 2. Species. Micaceous Uranite. Id. Brochant, ii. 463. Kirwan, ii. 304. Exter. Char.—Sometimes in thin layers, but often crystallized in rectangular four-sided tables ; in cubes, and six-sided prisms variously modified. Crystals small, and grouped together ; lustre shining, pearly; fracture foliated. Vol, XIV. Part L f Colour emerald or grass green of various shades, Metallic rarely wax yellow j translucent; streak greenish white j Ores, soft; not very brittle. Spec. grav. 3.12. Chcm. Char.—Soluble, without effervescence, in ni¬ tric acid, which it colours citron yellow. Const. Part.?.—.This species is an oxide of Uranium, with a small portion of copper. Localities, Sec.—Found in Saxony, France, and Corn¬ wall in England, accompanied by some ores of iron, sometimes by cobalt. 3. Species. Uranite Ochre. Id. Broch. ii. 466. Id. Kirw. ii. 303. Exter. Char.—I ound massive, but usually dissemi¬ nated, or superficial; is dull, or rarely shining; frac¬ ture earthy, or foliated ; fragments blunt-edged. Colour citron yellow, aurora red, or sulphur yellow; opaque ; soft and friable ; brittle ; stains a little ; feels meagre. Spec. grav. 3.15 to 3.24. Constituent Parts.—Compost'd of oxide of uranium, with a portion of iron. Localities, Sec.—Found in similar places with the former. xx. tellurium Genus. 1. Species. Native Tellurium. Id. Broch. ii. 480. Sylvanitc, Kirw, ii. 324. Hauy, iv* 325- Exter. Char.—Massive or disseminated; shinimrt fracture foliated. Colour between tin and silvery white ; soft; not very brittle. Spec. grav. 5.7 to 6.1. Client. Char.—Melts easily before the blow-pipe. Constituent Parts. Klaproth. Tellurium, 92.6 Iron, 7.2 Gold, .2 I 00.0 Localities, Sec.—Has been only found at Fatzelay in Transylvania, where it exists in veins, in mountains ot gray wacken and transition limestone. The ore is dug out for the purpose of extracting the gold. It was called aurum paradoxum, and aurumprohle viaticum, because its external appearance did not indi¬ cate that it contained gold, 2. Species. Graphic Ore of Tellurium. Id. Broch. ii. 482. ,Hauy. iv. 327. Exter. Char.—Massive and crystallized in fiat four or six-sided prisms, which are arranged in rows, ex¬ hibiting something of the appearance of written cha¬ racters, and hence the name graphic ore. Surface smooth, shining; longitudinal fracture foliated and re¬ splendent ; cross fracture uneven. Colour tin white, yellowish, or lead gray ; soft and brittle. Spec. grav. 5.72. Chem. Char.—Burns with a greenish flame before the blow-pipe. I i Constituent mineralogy. Constituent Parts. Klaproth. Tellurium, 60 Gold, 30 Silver, 10 Localities, Has only been found at Offenbanya in Transylvania, in veins traversing porphyry and gra¬ nular limestone accompanied by iron pyrites and copper It is wrought for the sake of the gold. MINERALOGY. Part Colour steel gray, and usually covered with a greenish Classify efflorescence j soft, or semihard ; not very brittle. tion. Constituent Parts.—This is supposed to be an alloy of T- chromium. Exter. Char. &c.—Found in the gold mine of Rud- nick near Schlangenberg in Suabia, in a matrix of white quartz, containing gold and galena. 100 ore. 3. Species. Yellow Ore of Tellurium. Id. Broch. ii. 484. Hauy, iv. 327. Exter. Char.—Disseminated, and crystallized in small four-sided prisms } shining, or weakly shining 3 fracture foliated ; cross fracture uneven. Colour silver white, brass yellow, or gray. Chem. Char.—Soluble in nitric acid. Co?istituent Parts. Klaproth. Tellurium, Gold, Dead, Silver, Sulphur, 44-75 26.75 I9-5 8-5 •5 100.00 2. Species. Ochre OF Chromium. Exter. Char.—Massive, disseminated, and in thin, plates dull ; fracture uneven or earthy. Colour verdigris green, or yellowish 5 soft. Localities, &c.—Found only in the same place, ac¬ companying the former. The chromates of lead and iron have been already described among the ores of those metals. XXII. COLUMBIUM Genus. Exter. Char.—Massive; fracture uneven, or foliated s lustre shining. Colour dark gray; opaque 5 not very hard 5 brittle. Spec. grav. 5.918. Constituent Parts. Oxide of Columbian), 78 ———— iron, 21 Loss, 1 Localities, &c.—Found only at Nagyag in Transyl¬ vania. 4. Species. Black or Foliated Ore of Tellurium. Id. Broch. ii. 486. Hauy, iv. 327. Exter. Char.—Found-in plates, which are united in¬ to masses, or disseminated, rarely crystallized in six- sided tables; surface smooth, shining ; external lustre resplendent 5 fracture foliated. Colour between lead gray and iron black j stains j soft*, flexible in thin plates. Spec. grav. 8.91. Chem. Char.—Before the blow pipe the sulphur and tellurium are dissipated in white fumes, and a metallic globule remains, surrounded by a black slag. Constituent Parts. Klaproth. Tellurium, 33. Lead, 50. Gold, « 8.5 Siver and copper, 1. Sulphur, 7.5 100.0 Localities, &c.—Found only in the same place with tbe preceding. XXI. CHROMIUM Genus. 1. Species. Needle Ore of Chromium. Exter. Char.—I ound in small crystals, which are imbedded -, lustre shining ; fracture uneven or conchoi- dal. 100 Localities, &c.—This mineral, of which the only specimen known is in the British Museum, was brought from Massachussets in America j it was analyzed by Mr Hatchett, and found to contain a new metal, which he denominated columbium. XXIII. TANTALIUM Genus. Two species of this mineral have been discovered j tantalite, and yttrio-tantalite. 1. Species. Tantalite. Exter. Char.—Crystallized in octahedrons} surface smooth fracture compact. Colour bluish gray, or black. Spec. grav. 7-95- Constituent Parts.—Composed of tantalium, iron, and manganese. Localities, Sec.—Found in Finland, in globular pieces, it) a vein of red feldspar, traversing a gneiss rock. 2. Species. Yttrio-Tantalite. Exter. Char.—Disseminated, in pieces of the size ol a nut; fracture even; lustre metallic. Colour dark gray j may be scratched with a knife powder gray. Spec. grav. 5.13. Constituent Parts.—Composed of iron, manganese, tantalium, and the new earth yttria. Localities, &c.—Found at Ytterby in Sweden, in the same place with gadolinite. These minerals were analyzed by Eckeherg, who dis¬ covered in them the new metal tantalium, which is now supposed to be the same with columbium. XXIT; c art I. MINER assifica- tion. XXIV. CERIUM Genus, i. Species. Cerite. Exter.Char.—Found massive or disseminated; lustre weakly glimmering ; fracture fine grained, even. Colour pale rose red ; opaque ; powder grayish; scratches glass. Spec. grav. 4.5 to 4.9. Chem. Char.—Infusible before the blow-pipe, and does not colour borax. Constituent Parts. Vauquelin. Oxide of cerium, 67. iron, .02 Silica, 17. Lime, .02 Water and carbonic acid, .12 Loss, i5*84 Klaproth. 54-5 4- 34- 5- 2-5 100.00 100.0 Localities, &c.—This mineral has been found in the copper mines of Bastnaes, at Riddarhytta, in Sweden, accompanied by copper, molybdena, bismuth, mica, and hornblende. The new metal contained in this mineral was dis¬ covered by Hisinger and Berzelius, chemists at Stock¬ holm. A L O G Y. Exter. Char.—Found massive ; shining, vitreous : fracture conchoidal. Colour velvet black, or brownish black ; opaque ; hard ; scratches quartz ; brittle. Spec. grav. 4.04. Chem. Char.—Reduced to powder, and heated in diluted nitric acid, it is converted into a thick yel¬ lowish gray jelly. Before the blow-pipe it decrepi¬ tates and becomes whitish red, but remains infusible. 25* Metallic Ores. Constituent Pa?'ts. Yttria, Silica, Lime, Alumina, Oxide of iron, Eckeberg. 47-5 25- 4*5 18. manganese, Water and carbonic acid, Loss, Vauquelin. 35- 25-5 2. 25- 2. IO.J Klaproth. 59-75 21.25 •5 I7-5 •5 •5 100.0 100.0 100.00 Localities, $x.c.—This mineral was examined by Pro¬ fessor Gadolin of Sweden, whose name it bears, and found to contain a peculiar earth. It was found near Ytterby in Sweden, and hence the new earth was call¬ ed Yttria. APPENDIX. IX. YTTRIAN Genus. To follow Strontian Genus, p. 209. Species. Gadolinite. Id. Brochant, ii. 512. Id. Hauy, iii. 141. EXPLANATION Plate CCCLI. Fig. 1. Represents the goniometer or graphometer, an instrument invented by Carangeau for measuring the angles of crystals. MTN is a graduated semicircle of brass or silver, furnished with two arms or rulers AB, IG, one of which, FG, has a slit from a to R, except¬ ing the cross bar at fv, which strengthens the instru¬ ment. This arm is fixed to a brass ruler at R and c placed behind, and which makes part of the semicircle. I he arm FG is connected with the ruler behind by nails which enter the slit and are furnished with nuts. The other arm has also a slit or opening from x to c, where it is fixed to the first by the screw nail which passes through both. By slackening the screws, the two parts c G and c B may be shortened at pleasure. The arm AB being only fixed at c, which is the centre of the circle, moves round this centre, while the arm GF re¬ mains constantly fixed in the direction of the diameter ■which passes through the points o and 1800. The up¬ per part of the arm AB should be brought to a thin edge from 25 to s, and the line of this edge should pass through the centre c; because it is by this edge that the The unavoidable length to which the first part of this treatise has extended, and some other circumstances render it necessary for us to introduce in a different part of the work, what we propose to lay before our readers in the second part relative to the analysis of stones and metallurgical operations. See Ores, Pc-.' duction of, and Stones, Analysis of. of the PLATES. measure of the angle on the graduated circumference is indicated. To discover the measure of any angle of a crystal, the two arms c B, c G are brought into contact with the sides containing the angle, and the degree indicated by the line z s on the circumference denotes the measure of that angle. The instrument is so contrived that the arms may be shortened for the convenience of applying it in different cases. But it might happen that it could not be applied in cases where the crystals are aggregat ed or attached to the matrix. This difficulty is obviated by another contrivance. The semicircle is furnished with a hinge at 90°, by which means it may be dimi- mshed at pleasure to a quadrant, by folding back one half. I here is a small bar of steel, one end of which is fixed behind the immoveable arm FG, and the other is attached by a notch and screw nail at O. When this nail is unscrewed, the bar e O falls behind the rulei- which supports FG, and thus one half of the semicircle folds back, and any angle not exceeding 90° may be measured; but when the angle is greater, it must be re¬ placed. Fig. 2. rs an apparatus by which small degrees of I i 2 electricity MI N E 71 Explans- rion of ihc Plates \ ejcctrieUy mav-'bc oLserved r.i ir.moruls. A is a small brass needle with knobs a b, and moveable on the pivot at the middle- The mineral whose electricity is to he tried, is rubbed on silk or woollen, and then presented to one of the knobs \ and by the distance at which the knob begins to be attracted, the strength of the electri¬ city may be, in some degree, estimated. In the same way substances which become electric by heat, such as the tourmaline, are to be tried j the same apparatus may be employed. To ascertain in what part of the mi¬ neral the different electricities exist, take a stick of sealing wax, at the extremity of which a silk thread has been attached, and having rubbed the wax, bring alter¬ nately the opposite extremities of the substance, for ex¬ ample, each of the summits of a tourmaline, within a small distance of the silk thread. If the extremity which is brought near the thread possess negative electricity, the thread will be repelled ; on the conti’ary, it will be attracted. Or the expeiument may be made in another way, particularly when the electrical body is small, or its electricity feeble. At B, fig. 2. the tourmaline 11* is held by a pair of pincers in such a way that the pole i is at a small distance from the knob a of the needle. C c is the stick of wax, one of whose extremities is placed on a tube of glass U w, and which acts by its extremity C, on the knob o, to excite in it positive electricity. In this case the wax, after the extremity which has been rubbed is placed in the position described, communi¬ cates to the knob of the needle to which it is present¬ ed, an electricity contrary to its own ; so that the ex¬ tremity of the tourmaline acted on by positive electri¬ city, repels the needle to which it is presented, and the other extremity, possessing negative electricity, attracts the needle. Fig. 3. is a spirit of wine blow-pipe, nearly on the plan of that invented by Mr Paul. It is made of brass, and consists of the following parts. a Is a hollow oval frame about five inches in its longest dimension, which supports the pillar d and the two lamps be, which may burn either oil or alcohol, but the latter is the best. The rim ee slips upon the pillar d as low as the shoulder of the latter will permit, but the rim may be raised at pleasure and kept fast by the scretv peg /i The rim supports the boiler g', which is a single hollow piece of thick brass containing about an ounce of alcohol, and has four openings, viz. three at top b, /, k, and one at bottom to receive the tube 0. This latter is long enough to reach the level of the outside of the top of the boiler, and consequent¬ ly the alcohol within the boiler cannot readily boil over into the tube, and the opening k which corres¬ ponds with it, is closely shut by a screw stopper, hol¬ lowed out a little beneath, to allow the free passage of the vapour down the tube. Here the vaporized alcohol is prevented from condensing at the point 0 by the con¬ tiguity of the flame of the lamp b, and as it passes on through the hollow pq into the jet tube r, it is imme¬ diately kindled by the flame of the lamp c, and the united flames are compelled sideways with such vio¬ lence as to form a long pencil of blue flame, attended with a considerable roaring noise- This continues as long as any alcohol is left in the boiler, which allows ample time for most blow-pipe operations. The boiler is filled at the opening /i. The centre hole i is nicely 5 A L O G Y. Parti fitted with a small brass plug kept down by a thin slip ExplJ of iron /, the other end of which slips over the top ol‘ Utm 01 the upright pillar d, and is confined between two flat screw-plates m n. The use of this is as a safety valve v~’ to take away all danger of the boiler bursting by the confined vapour not being able to escape fast enough through the jet-pipe r, for when the internal pressure is great, the elasticity of the iron spring / allows the valve t to rise sufficiently to let out part of the enclosed va¬ pour. The screw stoppers /i and k are made still tight¬ er by collars of leather, as is the part where the tube 0 joins the boiler. The jet-pipe r has a complete rota¬ tory motion, so that the flame may be impelled in any direction. This is effected by turning in the form of a ball that part of the pipe which is inclosed in the hol¬ low p q. But this blow-pipe, although an elegant philosophi¬ cal apparatus, will not be found to answer where a great degree of heat is required to be kept up for a consider¬ able time. Other contrivances, therefore, of a simpler nature, have been proposed ; and perhaps the best of these is the blowT-pipe which is used by the mouth. The following is a description of a blow-pipe ot this kind. Fig. 4. represents this blow-pipe, Is a brass tube, having a circular enlargement c, lor the purpose of con¬ densing the moisture which is blown from the lungs $ the smaller end d is moveable round the centre r, so that any degree of obliquity may be given to the flame. Fig. 5. is a separate jet-pipe with a small opening, which is screwed on the blow-pipe at d; and it may he convenient to have two or three jet-pipes of different sizes, according as a larger and more moderate, or a smaller and more intense flame is wanted. Is a piece of ivory which slips on the larger end, for the purpose of being applied to the mouth, as being more agree¬ able. The best kind of flame for blowing through with the common blow-pipe is a wax or tallow candle with a very large wick, which should he kept snuffed mode¬ rately low, and the wick turned a little aside from the pipe. A spirit lamp is sometimes used, which makes a perfectly clear flame without smoke, but weak when used in this way. There is a kind of knack in blowing with the mouth, which is not easily described, and re¬ quires a little practice to be performed with ease. As the flame must often be kept for several minutes, the act of respiration must he carried on through the nostrils without interruption, and the stress of blowing must be performed merely by compression of the cheeks upon the air in the mouth. The substance to be heated is placed either on a piece of charcoal or a metallic support. When the former is used, a large close well-burnt piece of charcoal must he chosen, a small shallow hole scooped out with a knife, and the substance laid upon it. The charcoal itself kindles all round the hole, and the hole is thus gradual¬ ly enlarged ; and the heat too is kept up round the sub¬ stance much more uniformly than when a metal support is used. At the same time however the chemical effect produced by heated charcoal should not be lorgotten, particularly the reduction of metallic oxides, and the deoxygenation of the fixed acids j so that, lor example, a small heap of minium or litharge heated red-hot on charcoal Irrt I. M I N E R A L O G Y. pl-vna- charcoal by.the blow-pipe, is spfecdily reduced to a glo- ot tiie bule of metallic lead j the phosphates are partially re- t>' duccd to phospluirets, &c. For a metallic support, platina is in general by far the best material. A small spoon of this metal, the shank of which may be stuck in a cork when held, and a small silver cup, the shank of which is fixed into a wooden handle, may be used in fusions with borax or alkaline fluxes’. A small forceps lately brought into use, and made entirely of two thin pieces of platina joined by rivets, and bent, will be useful in bolding any small hard substance in the blow-pipe flame for any length of time, without danger of the points of the forceps melt¬ ing j and it is also found that this metal is so much worse a conductor of heat than any other, that the fox- ceps never gets too hot for the naked fingers to touch at the bend *. Fig. 6. represents a portable pocket blow-pipe, in- * \ikiris 11 of _ . . (\nistry, vented by Dr Wollaston, and of its actual size. The &yjp- interior tube is longer than the exterioi-, that it may he Mtr' readily withdrawn •, and the upper edge of the large end is turned outward, to diminish the effort of the lips requisite for retaining it in the mouth. Fig. 7. represents the -whole apparatus, one half of its real dimensions, and connected for use. The small exti’emity a is placed obliquely at an angle of about 120°, that the flame impelled by it may be cai’ried to a more convenient distance from the eye, and thus an¬ swering the purpose of a longer blow-pipe. This oblique piece a is composed of three parts, the largest of which is made stronger, that it may not be injured by use. One end is closed, and into the other is inserted a small peg of wood, perforated so as to receive the tip which is intended to he occasionally separated, for the pur¬ pose of passing a fine needle into it, to remove obstruc¬ tions f. h. i XV. Plates CCCLII. and CCCLIII. Fig. 1. Diamond,—spheroidal, with 48 convex faces. Fig. 2. Tsircon,—the pi’imitive form an octahedron with isosceles triangles. Fig. 3. Zircon,—rectangular foui’-sided prism termi¬ nated by a four-sided pyramid set on the lateral faces. Fig. 4. Hyacinth,—a dodecahedron formed from a rectangular four sided prism terminated by a four-sided pyramid set on the lateral edges. Fig. 5. Chrysoberyl,—double six-sided pyramid flat¬ tened, having the summits truncated. Fig. 6. Chrysolite,—a compressed eight-sided prism, terminated by an eight-sided pyramid, whose sides cox-- respond to those of the prism, and whose summit is truncated by a convex surface. lig. 7. Augite,—the primitive form, an oblique four- sided prism with rhomboidal bases. Fig. 8. Commonform of augite,—a short, eight-sided, compressed prism, terminated by two oblique faces. f ig. 9. Pistao&itc,— a six-sided prism with two broad and four narrow faces, and bevelled at the extremi¬ ties. Fig. 10. and 11. other forms in which the prisms are terminated by several oblique faces with a truncated summit. Fig. 12. V1"suvian,—a four-sided prism with the edges truncated, and terminated by four oblique and one ho- rixental face. Fig. 13. Garnet,—•primitive form, a rhomboidal do¬ decahedron. Fig. 14. Trapezoidal garnet,—composed of 24 faces, which ai’e equal and similar trapezoids. Fig. 15. Grcnatite,—a six-sided prism with the greater angles at each base truncated. 1‘ ig. 16. Two crystals of the same crossing each other obliquely. Staurotide, oblique angle, of Hauy. I ig'. 17’ Comndum,—two six-sided-pyramids united by the bases, with the summits and angles truncated. i ig. 18. A six-sided prism, having the alternate angles at each base truncated. fig. 19. Topaz,—an eight-sided prism terminated by an obtuse four-sided pyramid at one extremity, and by a different one at the other. Fig. 20. A similar prism with six of the terminal edges truncated. Fig. 22. Tourmaline,—primitive form, which is a-> obtuse rhomboid. Fig. 23. A nine-sided prism, terminated at one ex¬ tremity by a six-sided summit, and by a three-sided summit at the other. Fig. 24. Same prism, with a three and a seven-sided summit at the extremities. Fig. 25. Axinite or Thumerstone,—primitive form, which is a rectangular four-sided pi’ism, whose bases am oblique-angled parallelograms. Fig. 26. A secondary form, same prism, having the alternate lateral and terminal edges truncated. Fig. 27. Rock-crystal.—A double six-sided pyramid. Fig. 28. A six-sided prism, terminated at each extre¬ mity by a six. sided- pyramid, having the altenxate an¬ gles at the opposite bases slightly truncated. Fig. 29. Feldspar,—the primitive form, which is an. oblique-angled parallelepiped. Fig. 30. An oblique four-sided prism. Fig. 31. A six-sided prism with four of the angles- truncated, and the two extremities bevelled. Fig. 32. The same prism, with four of the terminal edges truncated. Fig 33. An oblique four-sided prism, bevelled and truncated at the extremities. Fig. 34, Chiastolitc,—the outer rhomboid marked, with black lines parallel to the sides of the black inter¬ nal rhomboid. Fig. 35, Foliated Zeolite, or Stilbite,—compressed four-sided prism, terminated by a four-sided summit set on the lateral edges. Fig. 36. A six-sided prism with two solid angles at. each extremity, truncated. Fig. 37. Cubic Zeolite, or Analcime,—the cube with all the solid angles truncated. Fig. 38. Cubic Zeolite,, or Chabasie,—composed of three rhomboids. Fig. 39. Cross-stone,—a double crystal composed of two dodecahedrons crossing each other at right angles.. Fig. 40. Hornblende,—primitive form, an oblique four-sided prism, whose base is a rhomboid. Fig. 41. Basaltic Hornblende,—a six-sided prism ter¬ minated at one extremity by four trapezoidal planes j and at the other by a bevelment, the planes of which are pentagons. Fig. 42. Tremolite,—an oblique four-sided prism, having the acute angles truncated and terminated by a dihedral summit,. Fig,. 253 Explana¬ tion of tiie Plates 254 MINER Plates. Explana- Fig. 43. Calcareous Spar, or Carbonate of Lwie,— tion of the primitive form a rhomboid. Fig. 44. A very obtuse rhomboid. Fig. 45. An acute rhomboid. Fig. 46. Approaching to the cube. Fig. 47. Double six-sided prism, known by the name of Dog-tooth spar. Fig. 48. A six-sided prism, terminated at each extre¬ mity by a trihedral summit whose faces are pentagons. Fig. 49. Also a six-sided prism with trihedral summits j but the bases of the terminal pentagons are enlarged in consequence of the inclination of the lateral faces. Figs. 50, 51, 52. Other forms of calcareous spar. Fig. 53. Sulphate of Lime,—primitive form. Figs. 54, 55. Common forms. Fig. 56. Sulphate of Barytes,—primitive form. Figs* 57, 58, 59- Common forms of sulphate of ba¬ rytes. Fig. 60. Sulphate of Strontites,—primitive form. Fig. 61. Common form. Fig. 62. Borate of Soda,—primitive form. Fig. 63. One of the common forms. Fig. 64. Carbonate of Soda,—primitive form, an a- cute octahedron. Fig. 65. One of the common forms, having two angles at the base truncated. A L O G Y. Fig. 66. Nitrate of Potash,—primitive form, a rect¬ angular octahedron. Figs. 67, 68. Common forms. Fig. 69. Sulphate of Magnesia,—the common form.. Fig. 70. Borate of Magnesia. Fig. 71. Sulphur,—primitive form. Fig. 72. Common form. Fig. 73. Mercury, Native Amalgam. Fig. 74. Cinnabar. Figs. 75, 76, 77. Bed Silver Ore. Figs. 78, 79, 80, 81, 82. Crystals of Copper Ore. Figs. 83, 84, 85, 86, 87, 88, 90, 91, 92, 93. Cry¬ stals of the Ores of Iron. Fig. 94. Carbonate of Lead. Fig. 95. Sulphate oj Lead. Figs. 96, 97. Molybdate of Lead. Figs. 98, 99, IOO. Crystals of Tin. Fig. 101. Oxide of Thine. Fig. 102. Sulphuret of Zinc. Fig. 103. Sulphuret of Antimony. Figs. 104, 105. Crystals of Cobalt. Fig. 106. Manganese. Fig. 107. Sulphuret of Arsenic. Fig. 108. Tellurium,—primitive form. Fig. 109. Common form. Figs, no, in, 112, 113. Crystals of Titanium Part; •Explajj tiou of} j Plate INDEX. A. Acanticone. See Pistazite, p Actynolite, Adamantine spar, Adhesive slate, Adularia. Agaric mineral, Agate, varieties of, formation of, Alum stone. Alumina, native, Aluminous schistus, Amber, Amethyst, Amianthus, Analcime. See Cubizite, Andalusite, Anhydrite, Antimony, ores of, 242, Apatite, Arragonite, Arctizitc, Arendalite. See Pistazite, Argillaceous genus, Arsenic, ores of, Asbestus, Asparagus stone, Augite, Axe-stone, Axinite, Azurite, B Barytes, carbonate of, Barytes, sulphate of, 161 Barytic gtxms, 196 Basalt, 157 Beryl, 183 Bismuth, ores of, 178 Bitter spar, 197 Bituminous marl slate, 167 Black lead. See Graphite. 168 Black schorl, 184 Blende, 181 Bole, 184 Bolognian spar, Boracite, 162 Borax, 195 Brown spar, 176 C. 178 Calamine, 205 Calcareous genus, 243 spar, 203 sinter, 201 tufa, 180 Calcedony, 161 Capillary salt. 181 Cornelian, 246 Cads eye, 194 Celestine, 203 Cerite, 153 Cerium, ores of, 193 Chobasie. See Cubizite, 161 Chalk, 177 Chiastolite. See Hollow spar, Chlorite, 206 Chromate of iron, p. 206 Chromium, ores of, ib. Chrysoberyl, 188 Chrysolite, 159 Chrysoprase, 240 Cimolite, 202 Cinnabar. See Mercury, 203 Clay, common, 216 pipe, 160 potters, 241 variegated, 191 slaty, 208 indurated, 212 slate, ib. Clinkstone. See Phonolitc, 201 Coal, Cobalt, ores of, 241 Columbium, ores of, 197 Combustibles, class of, 199 Copper, ores of, 200 mines of, 201 Corundum, 167 Crossstone, 209 Cryolite, 167 Cube spar, 173 Cubizite, 208 Cyanite, 251 D. ib. Datholite, 178 Diamond, 198 mines of, 180 method of valuing, 187 Diamonds, celebrated, 237 Dipyre, 3 p.2 I I r 220, 2: l! 2; 225—2; 23°,2: I! K 21 2C r 2C n iJ j ; 4 1 i 1.5 Dolomit \ ntlex. )olomite, )rawing slate, merald, mery, ipsom salt, Inclose, E. F. 'delspar, common, compact, 'inure stone, lint, lints, formation of, theories of, gun, manufacture of, iinty slate, hat stone, tuor, spar, ,am earth, tlkrs earth, G. idolinite, appendix, irnet, precious, common, Bohemian, black, mber salt, native. Id, ores of, mines of, ophite, ven earth, 1 enatite, 1 « flints, manufacture of, i mm, H. j mahtes. See Iro?i ores, ■i wy spar, t iotrope, 1 low spar, f 'nstone, 1'nstone, splintery,- conchoidal, * f inth, i-lite, &«rargillite, /(e r, Egyptian, striped, porcelain, common, agate, opa!, "Wpht/ialmite, { um' ore °f See Platina, ores of, ]>. 202 *59 157 210 158 178 n 179 ib. 192 166 ib. ib. ib. 165 184 204 ib. 201 192 251 *54 ib. ib. 154 210 217 219, 220 216 190 155 166 204 237 Hf/ore stone, "ionite, L 233» 234 206 172 180 188 164 ib. *6 5 169 118 171 ib. ib. ib. ib. 172 ib. 181 217 231 179 177 mineralog Lava, Lazulite, Lead, ores of, Lcpidolite, Leucite, Limestone, Lithomarga, Loam, Lydian stone, M. 245, Magnesia, native, Magnesian genus, Magnetic iron ores, Malachite ore of copper. Manganese, ores of, Marbles, varieties of, Marl, Meoinite, Melanite, Mellite, Menachanite, Menilite, Mercury, ores of, Mcsotype. See Fibrous Zeolite, Mica, Mineral oil. See Petroleum, pitch, Mineralogy, history of, 129 Minerals, classification of, external characters of, table of, Mountain butter, cork, soap, Muriate of copper, N. Native vitrol, alum, Glauber salt, nitre, Y. p.189 177 —239 i85 Ji4 198 190 182 *65 191 ib. 232 228 246 199 202 181 ■T54 214 248 170 220, 221 I75 186 213 ib. -132 132 133 145—147 209 T94 190 228 Natrolite, Nephrite, Nickel, ores of, Nigrine, 244: O. Obsidian, Olivine, Oolite, Opal, mines of, common, wood, Orpiment, Osmium. See Platina, P. Palladium. Pearl-stone, Peastone, Petroleum, Phonolite, Phosphorite, Finite, Pisolite, Pistazite, Pitch-stone, See Platina, 209 ib. 210 ib. 177 193 245 248 J73 152 198 169 ib. 170 ib. 247 217 217 174 200 213 189 203 186 200 161 *73 Plasma, Platina, ore of, Plumbago. See Graphite, Polishing slate, Porcelain-earth, Pot-stone, Prase, Prehnite, Pumice, Pyrites, copper, iron, Pyrope, Pyrophysalite, Q. Gfuartz, common, rosy red, ferruginous, R. Rhodium. See Platina, Rhomb spar, Rock crystal, salt, s. Sahlite, Sal ammoniac, Salts, class of. Sapphire, Scapolite, Schiller-stone, Schorl, Schorlite, Schorlous beryl, Sea-froth, Selenite, Semi-opal, Serpentine, Siliceous genus, Siliceous schistus, Silver ores, Sinter, calcareous, ' Slaty spar, Smaragdite, Soda, Sommite, Specular iron ore. Spindle, Spodumene, Steatites, Strontian genus, Strontites, carbonate of, sulphate of, Stilbite. See Foliated Zeolitey Sulphur, Swine-stone, T. Talc, Tantalium, ores of, Tellurium, ores of, Thinner-stone. See Axinite, Tin, ores of, Titanium, ores of, Topaz, Tourmaline, 255 p.172 217 216 *83 182 186 164 J74 ib. 226 231 *55 158 162 163 ib. ib. 217 202 162 210 i97 211 2®9 156 180 *93 260 ib. ib. 191 20C 170 *93 *65 222—225 200 201 197 211 181 232 *56 180 192 208 ib. ib *75 212 202 194 2 co 249 161 239, 248 248 158 160 Tremolite, 256 Trcmolite, Tripoli^ Tu/nrstau ores of, " U. Umber, Uranium, ores of, V. Ycfiuvian. W. 'bracken. p. 196 i83 247 190 249 153 1.89 M I N E R A L O Wavellite. See Hy dr argillite, Wernerite. See Arcti%itc, Whet slate, Withe rite. Wolfram, Wood opal, Wood stone, Y. Yellow earth, Yttrian genus, appendix, G Y. p- *78 180 Zeolite, 185 mealy, 206 fibrous, 247 radiated, 1 •jo foliated, 165 Zinc, ores of, Zircon, 190 Zoy%ite, 251 Z. Indej p. !■ i: i ii ii 11 )) coSBSBSSSI M I N Hi in cry a MINERVA, or Pallas, in Pagan worship, the II goddess of sciences and of wisdom, spiung completely .Mm-rcl,:l- armed from Jupiter’s brain : and on the day ot her na- v tivity it rained gold at Rhodes. She disputed with Neptune the honour of giving a name to the city of Athens *, when they agreed that whosoever of them should produce what was most useful to mankind, should have that advantage. Neptune, with a stroke of his trident, formed a horse ; and Minerva caused an olive to spring from the ground, which was judged to be most useful, from its being the symbol of peace. Minerva changed Arachne into a spider, lor pretend- in <>- to excel her in making tapestry. She fought the giants; favoured Cadmus, Ulysses, and other heroes 5 and refused to marry Vulcan, choosing rather to live in a state of celibacy. She also deprived Tiresias ot sight, turned Medusa’s locks into snakes, and perfoim- ed several other exploits. Minerva is usually represented by the poets, paint- ers and sculptors, completely armed, with a composed but agreeable countenance, bearing a golden breastplate, a spear in her right hand, and her aegis or shield in the left, on which is represented Medusa’s head encircled with snakes, and her helmet was usually entwined with .olives. . Minerva had several temples both in Greece and Italy. The usual victim offered her was a white hei- never yoked. rlhe animals sacred to her were the *cock, the owl, and the basilisk. AIinervm Cast rum, Arx Minervce, iSlmcrvium, or Templum Minerva:, in Ancient Geography, a citadel, temple, and town on the Ionian sea, beyond Hydrus 5 seen a great way out at sea. Now Castro, a town of Otranto in Naples. E. Long. 19* 25- N. Lat. 46. 8. Minervje Promontarium, in Ancient Geography, the •seat of the Sirens, a promontory in the Sinus Paestanus, the south boundary of Campania on the luscan coast*, so called from a temple of Minerva on it j situated to the south of Surrentum, and therefore called Surrentunn. Now Capo della Minerva, on the west coast of Naples, over against the island Capri. MINER VALIA, in Roman antiquity, festivals ce¬ lebrated in honour of Minerva, in the month of March *, at which time the scholars had a vacation, and usually made a present to their masters, called from this festival Minerval. MINGRELIA, anciently Colchis, a part of Western Georgia, in Asia } bounded on the east by Iberia, or Georgia properly so -called j on the west, by M I N the Euxine sea } on the south, by Armenia, and part Miagreq of Pontus ; and on the north, by Mount Caucasus. u—^ Colchis, or Mingrelia, is watered by a great many rivers •, as the Corax, the Hippus, the Cyaneus, the Charistus, the Phasis, where the Argonauts landed, the Absarus, the Cissa, and the Ophis, all emptying them¬ selves into the Euxine sea. The Phasis does not spring from the mountains in Armenia, near the sources of the Euphrates, the Araxes, and the ligris, as Strabo, Pliny, Ptolemy, Dionysius, and after them Arrian, Reland, Calmet, and Sanson, have falsely asserted; but rises in Mount Caucasus *, and flows not from south to north, but from north to south, as appears from the map of Col¬ chis or Mingrelia in Thevenot’s collection, and the ac¬ count which Sir John Chardin gives of that country. This river forms in its course a small island called also Phasis: whence the pheasants, if Isidorus is to be cre¬ dited, were first brought to Europe, and thence called by the Greeks Phasiani. The other rivers of Colchis are considerable. The whole kingdom of Colchis ivas in ancient times very pleasant and fruitful, as it is still where duly cul¬ tivated *, abounded in all necessaries of life ; and was enriched with many mines of gold, which gave occasion to the fable of the Golden Fleece and the Argonautic expedition, so much celebrated by the ancients. Sir John Chardin tells us, that this country extends above 100 miles in length and 60 in breadth ; being not near so extensive as the ancient Colchis, which reached from the frontiers of Iberia or Geoigia Pro¬ per, westward to the Palus Mteotis : that it is beau¬ tifully diversified with hills, mountains, valleys, woods, and plains, but badly cultivated: that there are all the kinds of fruits which are found in England, grow¬ ing wild, but tasteless and insipid for want of cul¬ ture: that, if the natives understood the art of ma¬ king wines, those of this country would be the finest in the world : that there are many rivers which have their source in Mount Caucasus, particularly the Pha¬ sis, now called the Rionc: that the country abounds in beeves, hogs, wild boars, stags, and other icnisonj and in partridges, pheasants, and quails : that falcons, eagles, pelicans, lions, leopards, tygers, wolves, and jackals, breed on Mount Caucasus, and sometimes greatly annoy the country : that the people are gene¬ rally handsome, the men strong and well made, and the women very beautiful *, but both sexes very vicious and debauched : that they marry their nieces, aunts, or other relations, indifferently; and take two or three wives MIN C 257 ] MIN Ingrelia. Wives if they please, and as many concubines as they Y—' will: that they not only make a common practice of selling their children, but even murder them, or bury them alive, when they find it difficult to bring them up: that the common people use a sort of paste, made of a plant called gom, instead of bread ; hut that of the better sort consists of wheat, barley, or rice : that the gentry have an absolute power over their vassals, which extends to life, liberty, and estate : that their arms are the bow and arrow, the lance, the sabre or broad¬ sword, and the buckler : that they are very nasty, and eat sitting cross-legged upon a carpet, like the Persians j but the poorer sort upon a mat or bench, in the same posture : that the country is very thin of inhabitants, no less than 12,000 being supposed to be sold yearly to the lurks and Persians : that the principal commodities exported from it are, honey, wax, hides, castor, martens skins, flax seed, thread, silk, and linen cloth j but that there are no gold or silver mines now, and very little money: that the revenue of the prince or viceroy amounts to about 20,000 crowns per annum : that the inhabitants calls themselves Christians ; but that both they and their priests are altogether illiterate, and igno¬ rant of the doctrines and precepts of Christianity: that their bishops are rich, have a great number of vassals, Mingrelia and are clothed in scarlet and velvet; and that their |] service is according to the rites of the Greek church, Miniature. with a mixture of Judaism and Paganism. v I he cities of most note in this country in ancient times were Pityus 5 Dioscurias, or Dioscorias, which was so called from Castor and Pollux, two of the Ar¬ gonauts, by whom it is supposed to have been found¬ ed, and who in Greek are styled Dioscuroi, at present known by the name of Savatapoli; Aea on the Phasis, supposed to be the same as Hupolis •, P/iasis, so called from the river on which it stood 5 Cyta, at the mouth of the river Cyaneus, the birth place ef the famous Medea, called from thence, by the poets, Cytais i Sa- racse, Zadris, Surium, Madia, and Zolissa. As for modern cities, it does not appear that there are any here considerable enough to merit a description ; or, if there are, they seem to be little, if at all, known to Europeans. MINHO, a great river in Spain, which taking its rise in Galicia, divides that province from Portugal,, and falls into the Atlantic at Caminha. MINIATURE, in a general sense, signifies repre¬ sentation in a small compass, or less than the reality. MINIATURE PAINTING, A DELICATE kind of painting, consisting of •*- •*- little points or dots 5 usually done on vellum, ivo¬ ry, or paper, wiflh very thin, simple, water colours.— The word comes from the Latin minium, “ red lead that being a colour much used in this kind of painting. The French frequently call it mignature, from mignon, “ fine, pretty,” on account of its smallness and deli¬ cacy : and it may be ultimately derived from umpos, “ small.” Miniature is distinguished from other kinds of paint¬ ing by the smallness and delicacy of its figures and faintness of the colouring; on which account it re¬ quires to be viewed very near. Sect. I. Of Drawing and Designing. lo succeed in this art, a man should be perfectly skilled in the art oi designing or drawing: but as most people who affect the one, know little or nothing of the other, and would have the pleasure of painting without giving themselves the trouble of learning to design (which is indeed an art that is not acquired without a great deal of time, and continual applica¬ tion), inventions have been found out to supply the place of it; by means of which a man designs or draws without knowing how to design. Hie first is chalking : that is, if you have a mind to do a print or design in miniature, the backside of it, on another paper, must be blackened with small coal, and then rubbed very hard with the finger wrapped in a linen cloth : afterwards the cloth must be lightly drawn over the side so blackened that no black grains may remain upon it to soil the vellum you would paint upon j and the print or draught must be fastened upon the vellum with four pins, to keep it from shifting. ^ OL. XIV, Part I. + And if it he another paper that is blackened, it must be put between the vellum and the print, or draught, with the blackened side upon the vellum. Then, with a blunted pin or needle, you must pass over the princi¬ pal lines or strokes of the print, or draught, the con¬ tours, the plaits of the drapery, and over every thing else that must be distinguished 5 pressing so hard, that, the strokes may be fairly marked upon the vellum un¬ derneath. Copying by squares is another convenient method for such as are but little skilled in the art of designing, and would copy pictures, or other things, that cannot be chalked. The method is this : The piece must be divided into many equal parts by little squares, mark¬ ed out with charcoal, if the piece be clear and whitish, and the black can be fairly seen upon it; or with white chalk, if it be too brown and dusky. After which, as many squares of equal dimensions must be made on white paper, upon which the piece must he designed j because, if this be done immediately upon vellum, (as one is apt to miscarry in the first attempt), the vellum may he soiled with false touches. But when it is neatly done upon paper, it must be chalked upon the vellum in the manner before described. When the original and the paper are thus ordered, observe what is in each, square of the piece to be designed j as a head, an arm, a hand, and so forth •, and place it in the correspond¬ ing part of the paper. And thus finding where to place all the parts of the piece, you have nothing to do but to form them well, and to join them together. By this method you may reduce or enlarge a piece to what compass you please, making the squares of your paper greater or less than those of the original 5 but they must always he of an equal number. To copy a picture, or other thing, in the same size K k and Drawing and proportion, another method is, to make use and varnished paper, or of the skin of a hog s bladder, \e MINIATURE of — viiiinoucu paper, or ot tne sain or a uu^ o i'ery Designing, transparent, such as is to be had at the gold-beaters. " y ^ TaJc or is;ngiass will likewise do as well. Lay any one of those things upon your piece; through it you will see all the strokes and touches, which are to be drawn upon it with a crayon or pencil. Then take it oft j and fastening it under paper or vellum, set up botu against the light in the manner of a window ; and with a°crayon, or "a silver needle, mark out upon the paper or vellum you have put uppermost, all the lines and touches you shall see drawn upon the varnished paper, bladder, talc, or isinglass, you have made use of, and which will plainly appear through this window. After this manner, making use of the window, or ot glass exposed to the light, you may copy all sorts of prints, designs, and other pieces on paper or vellum : laying and fastening them under the paper or vellum upon which you would draw them. And it is a very dood and a very easy contrivance for doing pieces oi the same size and proportion. If you have a mind to make pieces look another way, there is nothing to be done but to turn them; laying the printed or drawn side upon the glass, and fastening the paper or vellum upon the back of it j remembering to let your lights fall on the left side. A good method likewise to take a true copy of a picture in oil, is to give a touch of the pencil upon all the principal strokes, with lake tempered with oil; and to clap upon the whole a paper of the same size. then passing the hand over it, the touches of the lake will stick and leave the design of your piece expressed upon the paper, which may be chalked like other things. But you must remember to take off with the crumb of bread what remains of the lake upon the picture be¬ fore it he dry. You must likewise make use of pounce, made ot powdered charcoal put in a linen rag ; with which the piece you would copy must be rubbed, after you have pricked all the principal strokes or touches, and fasten¬ ed white paper or vellum underneath. When the piece is marked out upon the vellum, you must pass with a pencil of very clear carmine over all the traces, that they may not be effaced as you work : then clepi your vellum with the crumb of bread, that no black may remain upon it. The vellum must he pasted upon a plate of brass or wood, of the size you would make your piece, to keep it firm and tight. But this pasting must be on the edges of your vellum only, and behind the plate, for which purpose your vellum must exceed your plate above an inch on every side •, for the part you paint upon must never be pasted •, because it would not only give it an ill look, but you could not take it off if you would. Cut off the little shags and locks of the vellum *, and wetting the fair side with a linen cloth dipped in water, clap the other upon the plate with a clean paper be¬ tween them : so much as hangs over must be pasted Upon the back of the plate, drawing it equally on all sides, and hard enough to stretch it well. Sect. II. O f Materials. The chief colours made use of for painting in minia¬ ture are, ' PAINTING. Carmine. Venice and Florence lake. Rose pink. Vermilion. Red lead. Brown red. Red orpiment. Ultramarine. Verditer. Indigo. Gall stone. Yellow ochre. Dutch pink. Gamboge. Naples yellow. Pale masticot. Deep yellow masticot. Ivory black. Lamp black. True Indian ink. Bistre, or wood soot. Raw umber. Burnt umber. Sap green. Verdigris. Flake white. Crayons of all colours. Gold and silver shells. Leaf gold and leaf silver. The seven transparent colours, which are used where writing is seen through the colour. 'Lake. Blue. Yellow. Liquid <{ Grass-green. Dark-green. Purple colour. Brown. Most of these colours necessary for miniature paint¬ ing may easily be prepared by attending to the direc¬ tions given under the article Colour-Making. As colours taken from earth and other heavy mat¬ ter are always too coarse be they never so well ground, especially for delicate work, because of a certain sand remaining in them } the finest parts may be drawn out by diluting them with the finger in a cup of water. When they are well steeped, let them settle a while : then pour out the clearest, which will he at top, into another vessel. This will be the finest, ami must be let dry *, and when it is used, must he diluted with gum water. If you mix a little of the gall of an ox, a carp, or an eel, particularly of the last, in green, black, gray, yellow, and brown, colours, it will not only take away their u reasy nature, hut also give them a lustre and bright¬ ness they have not of themselves. The gall of eels must be taken out when they are skinned, and hung upon a nail to dry} and when you would use it, it must be di¬ luted with brandy ; add a little of it mixed with the colour you have diluted already. This likewise makes* the colour stick better to the vellum, which it hardly does when it is greasy: moreover, this gall hinders it from scaling. vSect. ]| Colour; &c. Some jiCt. IT. MINIATURE PAINTING. Jours, |:&C Some colours are made clearer by fire ; as yellow, ochre, brown red, ultramarine, and umber: all others are darkened by it. But if you heat the said colours with a sharp fire, they change j for the brown red be¬ comes yellow •> yellow ochre becomes red ; umber red¬ dens also. Ceruss by fire takes the colour of citron, and is often called masticot. Observe, that yellow ochre heated, becomes more tender than it was, and softer than brown red. Likewise brown red heated becomes softer than fine yellow ochre. Both are very proper. The finest and truest ultramarine, heated upon a red- hot iron, becomes more glittering j but it wastes, and is coarser and harder to work with in miniature. All these colours are diluted in little cups of ivory, made on purpose, or in sea shells, with water in which gum arabic and sugar candy are put. For instance, in a glass of water put a piece of gum as big as a wal¬ nut, and half that quantity of sugarcandy. This last hinders the colours from scaling when they are laid on, which they generally do when they want it, or the vel¬ lum is greasy. This gum water must be kept in a neat bottle cork¬ ed ) and you never must take any out of it with a pen¬ cil that has colour upon it, but with a quill or some such thing. Some of this water is put in the shell with the co¬ lour you would temper, and diluted with the huger till it be very fine. If it be too hard, you must let it soften in the shell with the said water before you dilute it. Afterwards let it dry j and do thus with every co¬ lour, except lily-green, sap-green, and gamboge, which must be tempered with fair water only. But ultrama¬ rine, lake, and bistre, are to be more gummed than other colours. If you make use of sea shells, you must let them steep two or three days beforehand in water: then cleanse them in boiling hot water, mixed with vinegar, in order to carry oft’ a certain salt, which otherwise sticks to them, and spoils the colours that are put to them. To know whether colours are sufficiently gummed, you have nothing to do but to give a stroke of the pen¬ cil upon your hand when they are diluted, which dines immediately : if they chap and scale, there is too much gum ; if they rub out by passing the finger over them, there is too little. It may be seen likewise when the colours are laid on the vellum, by passing the finger over them. If they stick to it like a powder, it is a sign there is not gum enough, and more must be put to the water with which you temper them : but take care you do not put too much; for that makes the co¬ lour extremely hard and dry. It may be known like¬ wise by their glueiness and brightness: so the more they are gummed, the darker they paint ; and when you have a mind to give a greater strength to a colour fhan it has of itself, you have nothing to do but to give it a great deal of gum. Provide yourself with an ivory pallet, very smooth, as big as your hand ; on one side of which the colours tor the carnation, or naked parts of a picture, are to be ranged in the following manner. In the middle put R great deal of white, pretty largely spread } because it is the colour most made use of: and upon the edge, from the left to the right, place the following colours at a little distance from the white. Masticot. Dutch pink. Orpiment. Y ellow ochre. Green ; composed of verditer, Dutch pink, and white, in equal quantities. Blue; made of ultramarine, indigo, and white, to a great degree of paleness. Vermilion. Carmine. Bistre, and Black. On the other side of the pallet, spread some white in the same manner as for the carnation. And when you have a mind to paint draperies, or other things, place near the white the colour you would make them of, in order to work, as shall be shown hereafter. The use of good pencils is a great matter. In or¬ der to make a good choice, wet them a little j and if the hairs keep close together as you turn them upon the finger, and make but one point, they are good : but if they close not together, but make several points, and some are longer than others, they are good for nothing. When they are too sharp pointed, with only four or five hairs longer than the rest, yet closing all together, they are, notwithstanding, good; but they must be blunted with a pair of scissars, taking care at the same time you do not clip away too much. It is proper to have two or three sorts of them ; the lai'gest for laying the grounds and dead colouring, and the smallest for finishing. To bring the hairs of your pencil to join close to¬ gether and make a good point, you must often put the pencil just between your lips when you are at rvork ; moistening and pressing it close with the tongue, even when there is colour upon it; for if there be too much, some of it is taken oft’ by this means, and enough left for giving fine and equal touches. You need not ap¬ prehend this will do you any harm. None of the co¬ lours for miniature, except orpiment, when they are prepared, have either ill taste or ill quality. This ex¬ pedient must especially be used for dotting, and for fi¬ nishing, particularly the naked parts of a picture, that the touches may be neat and fair, and not too much charged with colour. As for draperies and other things, as w'ell in dead colouring as in finishing, it is sufficient, in order to make the hairs of your pencil join well, and to unload it when it has too much co¬ lour, to draw it upon the edge of the shell, or upon the paper you must put upon your work to rest your hand on, giving some strokes upon it before you work upon your piece. To work well in miniature, you must do it in a room that has but one window, and fix yourself very near it, with a table and desk almost as high as the window; placing yourself in such a manner, that the light may always come in on the left side, and never forward or on the right. When you would lay a colour on all parts equally strong, as for a ground, you must make your mixtures in shells, and put in enough for the thing you design to paint; for it there be not enough, it is a great chance but the colour you mix afterwards is too dark or too light. :59 Colours, &c. K k 2 Sect. 26c MINIATURE Of Work-njr. Sect. III. Of Working. After having spoke of vellum, pencils, and colours, let us now show how they are to be employed. In the first place, then, when you would paint a piece, be it carnation, drapery, or any thing else, you must begin by dead-colouring j that is to say, by laying your co¬ lours on with liberal strokes of the pencil, in the smoothest manner you can, as the painters do in oil j not giving it all the force it is to have for a finishing j that is, make the lights a little brighter, and the shades less dark, than they ought to be ; because in dotting upon them, as you must do after dead-colouring, the colour is always fortified, and would at last be too dark. There are several ways of dotting; and every painter has his own. Some make their dots perfectly round ; others make them a little longish •, others hatch by little strokes that cross each other every way, till the work appears as if it had been wrought with dots. This last method is the best, the boldest, and the soon¬ est done : wherefore such as would paint in miniature ought to use it, and to inure themselves from the first to dot in the plump and the solt way j that is to say, where the dots are lost, in a manner, in the ground upon which you work, and only so much appears as is sufficient to make the work seem dotted. The hard and the dry way is quite the reverse, and always to be avoided. This is done by dotting with a colour much darker than your ground, and when the pencil is not moistened enough with the colour, which makes the work seem rough and uneven. Study likewise carefully to lose and drowu your co¬ lours one in another, so that it may not appear where they disjoin j and to this end, soften or allay your touches with colours that partake ot both, in such sort that it may not appear to be your touches which cut and disjoin them. By the word cut, we are to under¬ stand what manifestly separates and divides, and does not run in and blend itself with the neighbouring co¬ lours } which is rarely practised but upon the borders of drapery. When your pieces are finished, to heighten them a little, give them a fine air ; that is to say, give, upon the extremity of the lights, small touches with a co¬ lour yet lighter, which must be lost and drowned with the rest. When the colours are dry upon your pallet or in vour shells, in order to use them they must be diluted with water. And when you perceive they want gum, which is seen when they easily rub off the hand or the vellum if you give a touch with them upon either, they must be tempered with gum water instead of pure wa¬ ter, till they are in condition. There are several sorts of grounds for pictures and portraitures. Some are wholly dark, composed of bistre, umbre, and Cologn earth, with a little black and white \ others more yellow, in which is mixed a great deal of ochre \ others grayer, which partake of indigo. In order to paint a ground, make a wash of the colour or mixture you would have it, or according to that of the picture or portraiture you would copy y that is to say, a very light lay, in which there is hardly any thing but water, in order to soak the vellum. PAINTING. Sect I Then pass another lay over that, someivliat thicker, and or strike it on very smoothly with large strokes as quick Work as you can, not touching twice in the same place before' v-j it lie dry; because the second stroke carries off what has been laid on at the first, especially when you lean a little too light upon the pencil. Other dark grounds are likewise made of a colour a little greenish and those are most in use, and the pro- perest to lay under all sorts of figures and portraitures; because they make the carnation, or naked parts of a picture, appear very fine ; are laid on very easily, and there is no occasion to dot them, as one is often obliged to do the others, which are rarely made smooth and even at the first; whereas in these one seldom fails of success at the first bout. Io make them, you must mix black, Dutch pink, and white, all together : more or less of each colour, according as you would have them darker or lighter. Aon are to make one lay very light, and then a thicker, as of the first grounds. lrou may also make them of other colours, if you please ; hot these are the most common. When you paint a holy person upon one of these grounds, and would paint a small glory round the head of your figure, you must not lay the colour too thick in that part, or you may even lay none at all, especially where this glory is to be very bright; but lay for the first time with white and a little ochre mixed together, of a sufficient thickness ; and in pro¬ portion as you go from the place of the head, put a little more ochre ; and to make it lose itself, and die away with the colour of the ground, hatch with a free stroke of the pencil, following the round of the glory sometimes with the colour of which it is made, and sometimes with that of the ground, mixing a little white or ochre with the last when it paints too daik to work with : and do this till one be insensibly lost in another, and nothing can be seen to disjoin them. To fill an entire ground with a glory, the brightest part is laid on with a little ochre and white, adding more of the first in proportion as you come nearer the. edges of the picture: and when the ochre is not strong enough (for you must always paint darker and darker), add gall stone, afterwards a little carmine, and lastly bistre. This first laying, or dead colouring, is to be made as soft as possible; that is to say, let these sha¬ dowings lose themselves in one another without gap or intersection. Then the way is to dot upon them with the same colours, in order to drown the whole toge¬ ther ; which is pretty tedious, and a little difficult, especially when there are clouds of glory on the ground. Their lights must be fortified in proportion as you remove from the figure, and finished as the rest, by dotting and rounding the clouds ; the bright and obscure parts of which must run insensibly into one another. For a day sky, take ultramarine and a good deal of white, and mix them together. With this make a lay, as smooth as you can, with a large pencil and liberal strokes, as for grounds ; applying it paler and paler as you descend towards the horizon ; which must be done with vermilion or red lead, and with white of the same strength with that where the sky ends, or something less ; making this blue lose itself in the red, which you bring down to the skirts of the earth, or tops of houses; mixing towards the end gall stone and. !Ct. IV. MINIATURE a good deal of white, in such a manner that the mix¬ ture he still paler than the former, without any visible intersection or parting between all these colours of the sky. When there are clouds in the sky, you may spare the places where they are to be ; that is to say, you need not lay on any blue there, but form them, if they are reddish, with vermilion gall stone and white, with a little indigo ; and if they are more upon the black, put in a good deal of the last ; painting the lights of one and the other with masticot, vermilion, and white, more or less of any of these colours, according to the strength you would give them, or according to that of the original you copy 5 rounding the whole as you dot •, for it is a difficult matter to lay them very smooth at the first painting: and if the sky is not even enough, you must dot it also. It is at your pleasure to exempt the places of the clouds, for you may lay them upon the ground of the sky; heightening the bright parts by putting a good deal of white, and fortifying the shadows by using less. This is the shortest way. A night or stormy sky, is done with indigo, black, and white, mixed together j which is laid as for a day sky. To this mixture must be added ochre, vermi¬ lion, or brown red, for the clouds the lights of which are to be of masticot or red lead, and a little white, now redder, now yellower, at discretion. And when it is a tempestuous sky, and lightning appears in some places, be it blue or red, it is to be done as in a day sky, drowning and losing the whole together at the first forming or dead colouring, and at the finishing. Sect. IV. Of Draperies. the To paint a.blue drapery, put ultramarine near white upon your pallet; and mix a part of the one with the other, till it makes a fine pale, and has a body. With this mixture you must form the brightest parts ; and then adding more ultramarine, form such as are darker ; and go on after this manner till you come to the deepest plaits and the thickest shades, where you must lay pure ultramarine : and all this must be done as for a first forming or dead colouring*, that is to say, laying the colour on with free strokes of the pencil, yet as smooth as you can 5 losing the lights in the sha¬ dows with a colour neither so pale as the light nor so dark as the shades. Then dot with the same colour as in the first forming, but a small matter deeper j that the dots may be fairly seen. All the parts must be drowned one in another, and the plaits appear with¬ out intersection. When the ultramarine is not dark enough to make the deeper shadows, how well soever it be gummed, mix a little indigo with it to finish them. And when the extremities of the lights are not bright enough, heighten them with white and a very little ultramarine. A drapery of carmine is done in the same manner as the blue y except that in the darkest places there is to be a lay of pure vermilion, before you dead colour with carmine, which must be applied at top j and in the strongest shades, it must be gummed very much; To deepen it the more, mix a little bistre with it. PAINTING. 261 There is likewise made another red drapery, which Of is first drawn with vermilion, mixing white with it Draperies, to dead colour the bright places, laying it pure and v unmixed for those that are darker, and adding car¬ mine for the grand shades. It is finished afterwards, like other draperies, with the same colours. And when the carmine with the vermilion do not darken enough, work with the first alone, but only in the deepest of the shades. A drapery of lake is made in the same manner with that of carmine ; mixing a good deal of white with it for the bright places, and very little for those that are dark. It is finished likewise with dotting } but you have nothing to do with vermilion in it. Violet draperies are likewise done after this manner j after making a mixture of carmine and ultramarine, putting always white for the bright parts. If you- would have your violet be columbine or dove colour, there must be more carmine than ultramarine : but if you would have it bluer and deeper, put more ultra- marine than carmine. A drapery is made of a flesh colour, beginning with a lay made of white, vermilion, and very pale, lake \ and making the shades with the same colours, using less white in them. This drapery must be very pale and tender, because the stufl of this colour is thin and light} and even the shades of it ought not to be deep. To make a yellow drapery, put a lay of masticot over all 5 then one of gamboge upon that, excepting the brightest places, where the masticot must be left entire 5 the dead colour with ochre, mixed with a little gamboge and masticot, putting more or less of the last according to the strength of the shades. And when these colours do not darken enough, add gall stone. And gall stone pure and unmixed is used for. the thickest shades 5 mixing a little bistre with it, if there be occasion to make them still darker. You finish by dotting with the same colours you dead-co¬ loured with, and losing the lights and the shades in one another. . , If you put Naples yellow, or Dutch pink, in lieu of masticot and gamboge, you will make another sort of yellow. The green drapery is made by a general lay of ver- diter; with which, if you find it too blue, mix masti¬ cot for the lights, and gamboge for the shades. After¬ wards add to this mixture lily-green or sap-green, to shadow with j and as the shades are thicker, put moie of these last greens, and even work with them pure and unmixed where they are to be extremely dark. A ou finish with the same colours, a little darker.. By putting more yellow, or more blue, in these co¬ lours, you may make different sorts of green as you please. To make a black drapery, you dead colour with black and white, and finish with the same colour, put¬ ting more black as the shades are thicker } and for the darkest, mix indigo with it, especially when you would have the drapery appear like velvet. You may always give some touches with a brighter colour, to heighten the lights of any drapery whatsoever. A white woollen drapery is made by a lay of white, in which there must be a very small matter of ochre, orpiment, or gall stone, that it may look a little yel¬ lowish. ’0 2 miniature Of lowislt. Then dead-colour, and finish the shades with Draperies, blue, a little black, white, and bistre $ putting a great deal 0f the last in the darkest. The light gray is begun with black and white, and finished with the same colour deeper. For a brown drapery, make a lay of bistre, white, and a little brown red ; and shadow with this mixture, made a little darker. There are other draperies called variable, because the lights are of a difterent colour from the shades. These are mostly used for the vestments of angels, for young and gay people, for scarfs and other airy attire, admitting of a great many folds, and flowing at the pleasure of the wind. The most common are the violets : of which they make two sorts j one, where the lights are blue ; and the other, where they are yellow. For the first, put a lay of ultramarine and very pale white upon the lights j and shadow with carmine, ul¬ tramarine, and white, as for a drajpery wholly violet *, so that only the grand lights appeal* blue. \et they must lie dotted with violet, in which there is a great deal of white, and lost insensibly in the shades. The other is done by putting upon the lights only, instead of blue, a lay of masticot j working the rest as in the drapery all violet, excepting that it must be dotted, and the light parts blended with the sha¬ dowy, that is, the yellow with the violet, with a little gamboge. The carmine red is done like the last j that is, let the lights be done with masticot, and the shades with carmine} and to lose the one in the other, make use of gamboge. The lake red is done like that of carmine. The green is done as the lake : always mixing ver- diter with lily or sap green, to make the shades } which are not very dark. Several other sorts of draperies may be made at dis¬ cretion, always taking care to preserve the union of the colours, not only in one sort of cloth cr so, but also in a group of several figures *, avoiding, as much as the subject will allow, the putting of blue near the colour of fire, of green against black } and so of other colours which cut and disjoin, and whose union is not kind enough. Several other draperies are made of foul colours, as brown red, bistre, indigo, &c. and all in the same manner. Likewise of other colours, simple and com¬ pound •, the agreement between which is always to be minded, that the mixture may produce nothing harsh and disagreeable to the eye. No certain rule can be laid down for this. The force and effect of your co¬ lours are only to be known from use and experience, and you must work according to that knowledge. Linen cloths are done thus : After drawing the plaits or folds, as is done in a drapery, put a lay of white over all j then dead colour, and finish the shades with a mixture of ultramarine, black, and white, using more or less of the last, according to their strength or tenderness •, and in the greatest deepenings put bistre, mixed with a little "white ; giving only some touches of this mixture, and even of pure bistre, upon the extremities of the greatest shadows, where the folds must be drawn, and lost with the rest. PAINTING. Sect, rj They may be done in another manner, by making o- a general lay of this mixture of ultramarine, black, Draper and very pale white 5 and dead colour (as has been said before) with the same colour, hut a little deeper. And when the shades are dotted and finished, heighten the lights with pure white, and lose them w'ith the deep¬ enings of the linen. But of whatever sort you make them, w’hen they are finished, you must give a yellowish teint of orpiment and white to certain places ; laying it lightly on, and as it were in water ; so that what is underneath may, notwithstanding, plainly appear, as well the shadows as the dotting. Yellow linen cloth is done by putting a lay of ■white, mixed with a little ochre. Then form and finish the shades with bistre, mixed with white and ochre •, and in the thickest shades use pure bistre j and before you finish, give some teints here and there of ochre and white, and others of white and ultramarine, as well upon the shades as the lights j but let them be very bright: and drown the whole together in dotting, and it will look finely. As you finish, heighten the extre¬ mities of the lights with masticot and white. You may add to this sort of linen, as well as to the white, cer¬ tain bars from space to space, as in Turkey mantuas j that is, small stripes blue and red with ultramarine and Carmine 5 one of red between two of blue, very bright and clear upon the lights, and deeper upon the shades. Virgins are pretty often dressed with veils of this sort (by Popish painters), and scarfs of this kind are put about necks that are bare } because they become the teint mighty well. If you would have both these sorts of linen transpa¬ rent, and the stuff or other thing that is beneath ap¬ pear through them, make the first lay for them very light and clear, and mix in the colour to shadow with, a little of that which is underneath, especially towards the end of the shades *, and only do the extremities of the lights, for the yellow, with masticot and white; and for the white, with pure white. They may be done in another manner, especially when you would have them altogether as clear as mus¬ lin, lawn, or gauze. To this end form and finish what is to be beneath, as if nothing was to be put over it. Then mark out the light and clear folds with white or masticot; and a shadowy with bistre and white, or with black, blue, and white, according to the colour you would make them ofl j making the rest somewhat faint¬ er : yet this is not necessary hut for the parts that are not to be so cleai\ Crape is done the same way ; excepting that the folds of the shades and the lights, and the borders too, are to be marked out with little filaments of black up¬ on what is underneath } which is likewise to be finished beforehand. When you would make a stufl' like a watered tabby, make the waves upon it with a colour a lit¬ tle lighter, or a little darker, in the lights and the shades. There is a manner of touching draperies which di¬ stinguishes the silken from the woollen. The last are more terrestrial and sensible ; the others more light and fading. But it must be observed, that this is an effect which depends partly upon the stuff and partly upon the colour ; and for the employing these in a manner suitable to the subjects and the deepenings of painting, jict. IV. MINIATURE Of painting, we shall here touch upon their different quali- iperies. ties. We liave no colour which partakes more of light, nor which comes nearer the air, than white $ which shows it to he fickle and fleeting. It may, nevertheless, be held and brought to by some neighbouring co¬ lour, more heavy and sensible, or by mixing them toge¬ ther. Blue is a most fleeting colour: and so we see, that the sky and the remotest views of a picture are of this colour } but it will become lighter and fickler in propor¬ tion as it is mixed w'ith white. Pure black is the heaviest and most terrestrial of all colours j and the more of it you mix with others, the nearer you bring them to the eye. Nevertheless, the different dispositions of black and white make also their effects different: for white often makes black disappear, and black brings white more into view j as in the reflection of globes, or other fi¬ gures to be made round, where there are always parts that fly as it were from the eye, and deceive it by the cratt of art: and under the white are here comprehend¬ ed all the light colours; as under the black, all the heavy colours. Ultramarine is then soft and light. Ochre is not so much so. Masticot is very light; and so is verditer. Vermilion and carmine come near this quality. Orpiment and gamboge not so near. Lake holds a certain mean, rather soft than rough. Dutch pink is an indifferent colour, easily taking the quality of others. So it is made terrestrial by mixing it with colours that are so ; and, on the con¬ trary, the most light and fleeting by joining it with white or blue. Brown red, umber, dark greens, and bistre, are the heaviest and most terrestrial, next to black. Skilful painters, who understand perspective, and the harmony of colours, always observe to place the dark and sensible colours on the fore parts of their pictures 5 and the most light and fleeting they use for the distances and remote views. And as for the union of colours, the different mixtures that may be made of them will learn you the friendship or antipathy they have to one another. And upon this you must take your measures for placing them with such agreement as shall please the eye. For the doing of lace, French points, or other things of that natm-e, put over all a lay of blue, black, and white, as for linen ; then heighten the flowerwork with pure white : afterwards make the shades above with the first colour, and finish them with the same. When they are upon the carnation or naked parts of a picture, or upon any thing else that you would show through an¬ other, finish what is beneath, as if nothing was to be put over it : and at top, make the points or lace with pure white, shadowing and finishing them with the other mixture. If you would paint a fur, yon must begin with a kind of drapery, done, if it be dark, with bistre and white, making the shadowings of the same colour, with less white. If the fur be white, do it with blue, white, and a little bistre. And when this beginning, or first forming, is done, instead of dotting, draw small strokes, turning, now in one manner, now in another, accord- 4 PAINTING. 263 mg to the course and flatting of the hair. Heighten of the lights of dark furs with ochre and white, and of the Carnations, other with white and a little blue. . F°r doing a building, if it be of stone, take indigo, bistre and white, with which make the beginning or first form of it} and for shadowing it, put less of this last} and more bistre than indigo, according to the co¬ lour of the stone you would paint. To these you may likewise add a little ochre, both for the forming and the finishing. But to make it finer, you must give, here and there, especially for old fabrics, blue and yellow teints, some with ochre, others with ultramarine, mixing always white with them, whether before the first forming, provided they appear through the draught, or whether upon it, losing or drowning them with the rest when you finish. When the building is of wood, as there are marfy sorts, it is done at discretion ; but the most ordinary way is to begin or first form with ochre, bistre, and white, and finish without white, or with very little 5 and if the shades are deep, with pure bistre. In the other they add sometimes vermilion, sometimes green or black ; in a word, just according to the colour thev would give it -, and they finish with dotting, as in dra¬ peries and every thing else. Sect. V. Of Carnations, or the naked parts of & Painting. There are in carnation so many different colour¬ ings, that it would be a difficult thing to give general rules upon so variable a subject. Nor are they mind¬ ed, when one has got, by custom and practice, some habit of working easily: and such as are arrived to this degree, employ themselves in copying their ori¬ ginals, or else they work upon their "ideas, without knowing how : insomuch that the most skilful, who do it with less reflection and pains than others, would likewise be more put to it to give an account of their maxims and knowledge in the matter of painting, if they were to be asked what colours they made use of for such and such a colouring, a teint here, and another there. Nevertheless, as beginners want some instruction at the first, we wull show in general after what manner se¬ veral carnations are to be done. In the first place, After having drawn your figure with carmine, and ordered your piece, apply for wo¬ men and children, and generally for all tender colour¬ ings, a lay of white, mixed w’ith a very little of the blue made for faces, of which we have told the compo¬ sition •, but let it hardly be seen. And for men, instead of blue, they put in this first lay a little vermilion; and when they are old, a little ochre is mixed with it. Afterwards follow all the traces with vermilion, carmine, and white, mixed together $ and begin all the shades with this mixture, adding white in propor¬ tion as they are weaker; and putting but little in the darkest, and none, in a manner, in certain places where strong touches are to be given : for instance, in the corner of the eye j under the nose ; at the ears j under the chin ; in the separations of the fingers; in all joints j at the corners of the nails j and generally ia every part where you would mark out separations 264- miniature Of in shades that are obscure. Neither need y»“ Carr.ations.gire to those places all the force and strength they ■ - 1 ought to have as soon as you beg,n or Erst fom 'hem^ hecause in working at top w.th green, the red you ntThavtrb^oriret formed or dead-co.onr- ed with red, make blue temts with u tramarine and a great deal of white, upon the parts which fly from tl e eve; that is to say, upon the temples j under and in the corners of the eyes •, on both sides the mouth, above and below 5 a little upon the middle of the forehead-; between the nose and the eyes j on the side of the cheeks j on the neck and other places where he flesli assumes a bluish cast. Yellowish teints are likewise made with ochre or orpiment, and a httle vermilio mixed with white, under the eyebrows, on the sides ot the nose towards the bottom, a little underneath the •cheeks, and upon the other parts which rise and come nearer the eye. It is especially from these teints tha the natural complexion is to lie observed, m order to catch it', for painting being an imitation of nature, the perfection of the art consists in the justness and simplicity of the representation, especially in face paint¬ ing When, therefore, you have done your first lay, your dead-colouring* and your teints, you must work upon the shades, dotting with green for the carnations or naked parts, mixing, according to the rule we have given for the tSints, a little blue for the parts which fly from the eyeand, on the other hand, making it a little yellower for those that are more sensible * that is to say, which rise, and come nearer the eye: and at the end of the shades, on the side of the light, you must blend and lose your colour insensibly m the ground of the carnation with blue, and then with red, according to the places where you pamt. If this mix¬ ture of green does not work dark enough at first, pass over the shades several times, now with red, and now with green ; always dotting : and this do till they are as they should be. ,..111 And if you cannot with these colours give the shades all the force they ought to have, finish, in the darkest, with bistre mixed with orpiment, ochre, or vermilion, and sometimes with pure bistre, according to the co¬ louring you would make, but lightly, laying on jour colour very clear. . . You must dot upon the clear and bright places with a little vermilion or carmine, mixed with much white, and a very small matter of ochre, in order to lose them with the shadowy, and to make the teints die away in¬ sensibly into one another taking care, as you dot, or hatch, to make your strokes follow the turnings and windings of the fleshy parts. I or though the rule be to cross always, this dotting or hatching ought to ap¬ pear a little • more here, because it rounds the parts. And as this mixture might make a colouring too red, .if it was always to be used, they work likewise in every part, to blend the teints and the shades with blue and a little green, and much white, so mixed as to be very pale j excepting, nevertheless, that this colour must not be put upon the cheeks, nor upon the extremities of the clear parts, no more than the other mixture upon these last, which must be left with all their light *, as certain places of the chin, of the nose, and of the forehead, and upon the cheeks •, which, and 1. 3 PAINTING. Sect! the cheeks, ought nevertheless to be redder than the 0f rest, as well as the feet, the hollows of the hands, and Carnatkl the fingers of both. Observe, that these two last mixtures ought to be so pale, that the work shall hardly be visiblefor they serve only to soften it j to unite the teints with one another, and the shades with the lights, and to drown the traces. Care must likewise be taken that you work not too much with the red mixture upon the blue teints, nor with the blue upon the others •, but change the colour from time to time, when you per¬ ceive it works too blue or too red, till the work be fi- nished. . , , . The white of the eyes must be shadowed with this same blue, and a little flesh colour ^ and the coiners, on the side of the nose, with vermilion and white giving them a little touch of carmine. The whole is softened with this mixture of vermilion, carmine, white, and a very small matter of ochre. The apples or halls of the eyes are dime with the mixture of ultramarine and white ; the last prevailing a little *, adding a little bistre, if they are yellowish ; or a little black, if they are gray. Make the little black circle in the middle, called the crystal of the eye ; and shadow the balls with indigo, bistre, or black, accord¬ ing to the colour they are of', giving to each a small touch of pure vermilion round the crystal ; which must be lost with the rest at the finishing. This gives viva¬ city to the eye. The round or circumference of the eye is done with bistre and carmine 5 that is to say, the slits or partings, and the eyelids, when they are large and bold ', espe¬ cially the upper ones ', which must afterwards be soft¬ ened with the red or blue mixtures we ha\e mention¬ ed before, to the end they may be lost in one another, and nothing seem intersected. When this is done, give a little touch of pure white upon the crystal, on the side of the lights. This makes the eye shine, and gives life to it. 4 • j The mouth is dead coloured witu vermilion, mixed with white', and finished with carmine, which is soft¬ ened as the rest. And when the carmine does not work dark enough, mix a little bistre with it. This is to ne understood of the corners in the separation of the lips and particularly, of certain mouths half open. The hands, and all the other parts of carnation, are done in the same manner as the faces ', observing, that the ends of the fingers he a little redder than the rest. When your whole work is formed and dotted, mark the separations of all the parts with little touches of carmine and orpiment mixed together, as well in the shadowy as the light places ; but a little deeper and stronger in the first, and lose them in the rest of the carnation. The eyebrows and the beard are dead-coloured, as are the shades of carnations ; and finished with bistre, ochre, or black, according to the colour they are of. drawing them by little strokes the way they ought to go j that is to say, give them all the nature of hair. The lights of them must he heightened with ochre and bistre, a little vermilion, and much white. For the hair of the head, make a lay of bistre, ochre, and white, and a little vermilion. When it is very dark coloured, use black instead of ochre. Afterwards form the shadowy parts with the same colours, putting less :t. VI. 0f less white in them ; and finish with pure bistre, or mix- mtions. ed witli ochre or black, by small strokes very fine, and close to each other, waving and buckling them accord¬ ing to the curling of the hair. The light parts must also be heightened by little strokes with ochre or or- piment, white, and a little vermilion. After which, lose the lights and the shades in each other, by working sometimes with a dark and sometimes with a light co¬ lour. And for the hair about the forehead, through which the skin is seen, it must be first formed with the co¬ lour thereof, and that of the carnation, working and shadowing with one and the other, as if you designed to paint none. ri hen form it, and finish with bistre. The lights are to be heightened as the other. Gray hair is dead-coloured with white, black, and bistre, and finished with the same colour, but deeper ; height¬ ening the bright and clear parts of the hair, as well as those of the eyebrows and the beard, with white and very pale blue, after having formed them as the others, with the colour of the flesh or skin 5 and finish with bistre. But the most important thing is to soften one’s work; to blend the teints in one another, as well as the beard and the hair about the forehead, with the other hair and the carnation j taking especial care not to work rough and dry j and that the traces, turnings, and windings of the carnation or naked parts, be not intersected. You must likewise accustom yourself to put white in your colours only in proportion as you work lighter or darker; for the colour you use the se¬ cond time must be always a little stronger and deeper than the first, unless it be for softening. Different colourings are easily made, by putting more or less of red, or blue, or yellow, or bistre, whe¬ ther for the dead-colouring, or for the finishing. That for women ought to be bluish; that for child¬ ren a little red ; and both fresh and florid. That for men ought to be yellower; especially when they are old. To make a colouring of death, there must be a first lay of white and orpiment, or a very pale ochre : dead- colour with vermilion, and lake, instead of carmine, and a good deal of white ; and afterwards work over it with a green mixture, in which there is more blue than any other colour, to the end the flesh may be li¬ vid and of a purple colour. The tints are done the same way as in another colouring ; but there must be a great many more blue than yellow ones, especially upon the parts which fly from the sight, and about the eyes ; and the last are only to be upon the parts which rise and come nearer the eye. They are made to die away in one another, according to the ordinary man¬ ner ; sometimes with very pale blue, and sometimes with ochre and white, and a little vermilion; soft¬ ening the whole together. The parts and contours must be rounded with the same colours. The mouth 13 t° be, in a manner, of a quite violet. It is dead- coloured, however, with a little vermilion, ochre, and white; but finished with lake and blue ; and to give it the deep strokes, they take bistre and lake, with which they likewise do the same to the eyes, the nose, nn the ears. If it be a crucifix, or some martyr, up¬ on whom blood is to he seen, after the finishing the Vol. XIV. Part I. h f 2^5 carnation, form it with vermilion, and finish it with of Land" carmine, making in the drops of blood a little bright scapes. reflecting spark, to round them. For the crown of' — thorns, make a lay of sea-green and masticot; shadow it with bistre and green ; and heighten the clear and light parts with masticot. Iron is formed, or first laid, with indigo, a little black and white; and finished with puie indigo, height¬ ening it with white. I or painting fire and flames, the lights are done with masticot and orpiment; and for the shades, they mix vermilion and carmine. A smoke is done with black, indigo, and white, and sometimes with bistre; one may likewise add vermilion or ochre, according to the colour it is to be of. Pearls are painted by putting a lay of white, and a little blue: they are shadowed and rounded with the same colour, deeper; a small white dot is made almost in the middle on the side of the light; and on the other side, between the shadow and the edge of the pearl, they give a touch with masticot, to make the reflection ; and under the pearls is made a little shadow of the co¬ lour of the ground they are upon. Diamonds are made with pure black; then they heighten them with little touches of white on the side of the light. It is the same thing for any other jewels you have a mind to paint: there is nothing to be done but to change the colour. For making a figure of gold, put a lay of shell-gold, and shadow it with gallstone. Silver is done the same way; excepting that it must be shadowed with indigo. One great means of acquiring a perfection in the art, is to copy excellent originals. We enjoy with pleasure and tranquillity the labour and pains of others. But a man must copy a great number before he is able to pro¬ duce as fine eflects ; and it is better to be a good copier than a bad author. Sect. VI. Of Landscapes. Ix the first place, After having ordered the economy of your landscape as of your ether pieces, you must form the nearest grounds or lands, when they are to appear dark, with sap or lily-green, bistre, and a little-verditer, to give a body to your colour; then dot with this mix¬ ture, but a little darker, adding sometimes a little black to it. For such pieces of ground as the light falls upon, and which are therefore clear and bright, make a lay of ochre and white, then shadow and finish with bistre. In some they mix a little green, particularly for sha¬ dowing and finishing. There are sometimes upon the fore part certain red¬ dish lands ; which are dead-coloured with brown-red, white, and a little green ; and finished with the same, putting a little more green in them. For the making of grass and leaves upon the fore¬ ground, you must, when that is finished, form with sea- green, or verditer, and a little white : and for those that are yellowish, mix masticot. Afterwards shadow them with lily-green, or bistre and gallstone, if you would have them appear withered. The grounds or lands at a little distance are formed L 1 with M INIATUHE PAINTING. miniature ■with venliter, and shadowed and finished with sap- green, adding bistre for some of the touches here and Such as are at a greater distance, are done with sea-green and a little blue j and shadowed with ver- ^ In a word, the farther they go, the more bluish they are to be made ; and the farthest distance ought to be of ultramarine and white } mixing in some places small touches of vermilion. Water is painted with indigo and white, and shadow¬ ed with the same colour, but deeper •, and to finish it, instead of dotting, they do nothing but make strokes and traces without crossing giving them the same turn with the waves, when there are any. Sometimes a little green must be mixed in certain places, and the light and clear parts heightened with pure white, particularly where the water loams. Rocks are dead-coloured like buildings ol stone ; excepting that a little green is mixed for forming and shadowing them. Blue and yellow teints are made upon them, and lost with the rest in finishing. And when there are small branches, with leaves, moss, or grass, when all is finished, they are to be raised at top with green and masticot. Ihey may be made yel¬ low, green, and reddish, for appearing dry in the same manner as on the ground. Rocks are dotted as the rest j and the farther they are off the more grayish they are made. , P i Castles, old houses, and other buildings of stone and wood, are done in the manner above mentioned •, speak¬ ing of those things, when they are upon the first lines. But when you would have them appear at a distance, vou must mix brown-red and vermilion, with much white ; and shadow very tenderly with this mixture; and the farther they are off, the weaker are the strokes to be for the separations. If they are covered with slate, it is to be made bluer than the rest. Trees are not done till the sky be finished •, one may, nevertheless, spare the places of them when they con¬ tain a good number} and however it be, such as come near the eye, are to be dead-coloured with verditer, mixing sometimes ochre j and shadowed with the same colours, adding lily-green. Afterwards you must work leaves upon them by dotting without crossing : for this must be done with small longish dots, of a darker colour, and pretty full of it, which must be conducted cn the side the branches go, by little tufts of a little darker colour. Then heighten the light? with verditer or sea-green, and masticot, making leaves in the same manner *, and when there are dry branches or leaves, they are dead-coloured with brown-red or gallstone, with white ; and finished with gallstone, without white, or with bistre. The trunks of trees are to be dead-coloured with ochre, white, and a little green, for the light and clear parts •, and for the dark they mix black, adding bistre and green for shadowing one and the other.— Blue and yellow tints are likewise made upon them, and little touches given here and there with white and masticot j such as you ordinarily see upon the bark of trees. The branches which appear among the leaves are done with ochre, verditer, and white j or with bistre PAINTING. Sect. 'H and white j according to the light they are placed in. f They must be shadowed with bistre and lily-green. IS®, Trees, which are at a little distance, are dead-co- ^ loured with verditer and sea-green j and are shadowed and finished with the same colours, mixed with lily- green. When there are some which appear yellowish, lay with ochre and white, and finish with gallstone. For such as are in the distances and remote views, you must dead-colour with sea-green } with which, for finishing, you must mix ultramarine. Heighten the lights of one and the other with masticot, by small dis¬ joined leaves. It is the most difficult part of landscape, in manner of miniature, to leaf a tree well. To learn, and break one’s hand to it a little, the way is to copy good ones 5 for the manner of touching them is singular, and can¬ not be acquired but by working upon trees themselves j about which you must observe to make little boughs, which must be leafed, especially such as are below and towrard the sky. And generally, let your landscapes be coloured in a handsome manner, and full of nature and truth •, for it is that which gives them all their beauty. Sect. VII. Of Flowers. It is an agreeable thing to paint flowers, not only on account of the splendour of their different colours, but also by reason of the little time and pains that are bestoAved in trimming them. Tlhere is nothing but de¬ light in it j and, in a manner, no application. Aon maim and bungle a face, if you make one eye higher than another ^ a small nose with a large mouth j and so of other parts. But the fears of these disproportions constrain not the mind at all in flower painting j for unless they be very remarkable, they spoil nothing. For this reason, most persons of quality, who divert themselves with painting, keep to flowers. Neverthe¬ less, you must apply yourself to copy justly •, and for this part of miniature, as for the rest, we refer you to nature, for she is your best model. Work, then, after natural flowers j and look for- the tints and different colours of them upon your pallet: a little use will make you find them easily 5 and to facilitate this to vou at the first, we shall, in the continuance of our design, show the manner of painting some j for natu¬ ral flowers are not always to be had *, and one is often obliged to work after prints, where nothing is seen but ^ It is a general rule, that flowers are designed and laid like other figures; but the manner of forming and finishing them is different: for they are first formed only by large strokes and traces, which you must turn at the first the way the small ones are to go, with which you finish: this turning aiding much thereto. And for finishing them, instead of hatching or dotting, you draw small strokes very fine, and very close to one an¬ other, without crossing 5 repassing several times, till your dark and your clear parts have all the force you would give them. , , Of Roses.—After making your first sketch, draw with carmine the red rose, and apply a very pale ay of carmine and white. Then form the shades with the same colour, putting less white in it: and lastly, wi 1 . VII. MINIATURE PAINTING. >f n'ers. pure carmine, but very bright and clear at the first ; fortifying it more and more as you proceed in your J work, and according to the darkness of the shades. This is done by large strokes. Then finish *, working Open it with the same colour by little strokes, which you must make go the same way with those of the graving, if it be a print you copy ; or the way the leaves of the rose turn, if you copy after a painting, or after nature *, losing the dark in the clear parts, and heightening the greatest lights, and the brightest or most lightsome leaves, with white and a little car¬ mine. You must always make the hearts of roses, and the side of the shadow darker than the rest; and mix a little indigo for shadowing the first leaves, particu¬ larly when the roses are blown, to make them seem faded. The seed is dead-coloured with gamboge j with which a little sap-green is mixed for shadowing. Roses streaked with several colours, ought to be paler than others, that the mixture of colours may be better seen ; which are done with carmine ; a little darker in the shades, and very clear in the lights j always hatch¬ ing by strokes. For white roses you must put a lay of white, ajid form and finish them as the red ; but with black, white, and a little bistre j and make the seed a little yellower. Yellow roses are done by putting in every part a lay of masticot, and shadowing them with gamboge, gallstone, and bistre j heightening the clear and light places with masticot and white. The stiles, the leaves, and the buds of all sorts of roses are formed with verditer, with which is mixed a little masticot and gamboge 5 and for shadowing them, they add sap green, putting less of the other colours when the shades are deep. The outside of the leaves ought to be bluer than the inside ; wherefore it must be dead-coloured with sea green, and sap green mixed with that for shadowing, making the veins or fibres on this side clearer than the ground, and those on the other side darker. The prickles which are upon the stiles and buds of roses, are done with little touches of carmine, which are made to go every way ; and for those that are upon the stalks, they are formed with Verditer and carmine, and shadowed with carmine and bistre: making the bottom of the stalks more reddish than the top, i. e. you must mix with the greeu car¬ mine and pui'e bistre. Of Tulips.—As there is an infinity of tulips, dif¬ ferent from one another, one cannot pretend to men¬ tion the colours with which they are all done. We will only touch upon the handsomest, called streaked; and these streaks are dead-coloured with very clear car¬ mine in some places, and with darker in others ; fi¬ nishing with the same colour by little strokes, which must be carried the same way with the streaks. And in others is put first a lay of vermilion. Then they form them by mixing carmine, and finish them with pure carmine. In some they put Florence lake over th? vermilion instead of carmine. Some are done with lake and carmine mixed together, and with lake alone, or with white and lake for the first forming} whether it be rest pink or Florence lake. There are some of a purple colour, which arc formed with ultra¬ marine, carmine, or lake, sometimes bluer and some¬ times redder. The manner of doing both one and the other is the same $ there is no difference hut in the colours. You must, in certain places, as between the streaks of vermilion, carmine, or lake, sometimes put blue made of ultramarine and white, and some¬ times a very bright purple, which is finished by strokes as tbe rest, and lost with the streaks. ri here are some likewise that have sallow tints, that are made with lake, bistre, and ochre, according as they are : but this is only in fine and rare tulips, and not in th>. common ones. For shadowing the bottom of them, they ordinarily take indigo and white lor such whose streaks are of carmine. For such as are of lake, they take black and white ; with which, in some, bistre is mixed, and in others green. Some are likewise to he shadowed with gamboge and umber, and always by strokes and traces, that turn as the leaves turn. Other tulips are likewise done, called bordered; that is to say, the tulip is not stteaked but on the edges of the leaves, where there is a border. It is white in the pm pie j red in the yellow; yellow in the red 5 and red in the white. The purple is laid with ultramarine, carmine, and white 5 shadowing and finishing it with this mix¬ ture. The border is spared ; that is to say, let only a light lay of white he put there, and let it be shadowed w'ith very bright indigo. The yellow is formed with gamboge, and shadowed with the same colour, mixing ochre and umber or bistre with it. The border is laid with vermilion, and finished with a very small matter of carmine. The red is formed with vermi¬ lion, and finished with the same colour, mixing car¬ mine or lake with it. The bottom and the border are done with gamboge j and for finishing, they add gallstone and umber, or bistre. The white is sha¬ dowed with black, blue, and white. Indian ink is very proper for this. The shadowings ot it are very tender. It produces alone the effect of blue and white, mixed with the other black. The border ot this white tulip is done with carmine. In all these sorts of tulips, they leave a nerve or sinew in the middle of the leaves that are brighter than the rest; and the borders are drowned at the bottom by small traces, turning crosswise 5 for they must not appear cut and separated, as the streaked or party-coloured. They make them likewise of several other colours. When they happen to be such whose bottoms on the in¬ side are black, as it were, they form and finish them with indigo, as also the seed about tbe nozzle or stalk0 And if tbe bottom is yellow, it is formed with gam¬ boge, and finished by adding umber or bistre. The leaves and the stalks of tulips are ordinarily formed with sea green, and shadowed and finished with lily green, by large traces all along the leaves. Some may likewise be done with verditer, mixing masticot with it, and shadowed with sap green, that the green of the shades may be yellower. The Anemony, or Wind-flower.—There are several sorts of them, as well double as single. The last are ordinarily without streaks. Some are made of a purple colour, with purple and white, shadowing them with the same colour; some redder, others bluer; some¬ times very pale, and sometimes very dark. Others are formed with lake and white, and finished with the same, putting less white \ some without any white at all. Others are formed with vermilion, and sha¬ dowed with the same colour j adding carmine. Yi e see likewise white ones, and some ol a citron colour. The last are laid with masticot $ and one and the other L 1 2 shadowed 26 Of Flowers. MINIATURE shadowed and finished sometimes with vermilion, and sometimes with very brown lake, especially near the seed, at the bottom} which is often likewise ot a blackish colour, that is done with indigo, or black and blue, mixing for some a little bistre ; and always working by very fine strokes and traces, and losing the lights in the shades. There are others that are brighter and clearer at the bottom than anywhere else j and sometimes they are perfectly white there, though the rest of the flower be dark. The seed ot all these anemonies is done with indigo and black, with a very little white, and shadowed with indigo ; and in some it is raised with masticot. The double ane¬ monies are of several colours. The handsomest have their large leaves streaked. Some are done, that is, the streaked or party coloured, with vermilion, to which carmine is added for the finishing ; shadowing the rest of the leaves with indigo 5 and lor the small leaves within, a lay is put of vermilion and white, and they are shadowed with vermilion mixed with carmine, mixing here and there some stronger touches, especially in the heart of the flower, next the great leaves on the side of the shadow. They finish with carmine, by little strokes and traces, turning the same way with the mixed or party colours, and the leaves. They form and finish the streaks or party colours of some others, as well as the tmail leaves, with puie carmine j leaving, nevertheless, in the middle of the last, a little circle, in which is laid dark purple, which is lost with the rest. And when ail is finished, they give some touches with this same colour round about the small leaves, especially on the side of the shadow, drowning them with the large ones, the remainder of which is shadowed either with indigo or black. In some, the small leaves are done with lake or purple, thou oh the party colours of the large ones be done with carmine. There are others, whose mixed colours are done with carmine, in the middle of most of the large leaves *, putting in some places vermilion under¬ neath, and losing these colours with the shadows of the bottom *, which are done with indigo and white. The small leaves are laid with masticot, and shadowed with very dark carmine on the side of the shade, and with very clear on the side of the light, leaving there in a manner pure masticot, and giving only some little touches with orpiment and carmine, to separate the leaves, which may be shadowed sometimes with a very little pale green. There are double anemonies painted all red, and all purple. The first are formed with ver¬ milion and carmine, in a manner without white, and shadowed with pure carmine, well gummed, that they may be very dark. Purple anemonies are laid with purple, and white, and finished with white. In a word, there are double anemonies as there are single ones, of all colours j and they are done in the same manner. The green of one and the other is verditer j with which masticot is mixed for forming. It is shadowed and fi¬ nished with sap green. The stiles of them are a little reddish •, wherefore they are shadowred with carmine mixed with bistre, and sometimes with green, after ha¬ ving laid them with masticot. The Carnation and the Pink.—It is with pinks and carnations as with anemonies and tulips •, that is, there are some mixt-coloured, and others of one single colour. The first are streaked and diversified some- PAINTING. Sitt. v; times with vermilion and carmine } sometimes with of pure lake, or with white •, some streaks very dark, and Flower! others very pale j sometimes by little streaks and di- versifications, and sometimes by large ones. Their bottoms are ordinarily shadowed with indigo and white. There are pinks of a very pale flesh colour, ami streaked and diversified with another, a little deeper, made with vermilion and lake. Others, which are of lake and white, are shadowed and streaked without white. Others all x’ed, which are done with vermilion and carmine as dark as possible. Others all of lake. And, lastly, there are others, wherein nature or fancy is the rule. The green of one and the other is sea green, shadowed with lily green or sap green. The Red Lidy.—It is laid with red lead, formed with vermilion, and in the deepest of the shades with carmine ; and finished with the same colour by strokes and traces, turning as the leaves turn. The clear and light parts are heightened with red lead and white. The seed is done with vermilion and carmine. The green parts are done with verditer, shadowed with lily or sap green. The Day Lily.—There are three sorts of them : 1. The gridelin, a little red 5 2. The gridelin, very pale 5 and, 3. The white. For the first they put a lay of lake and white, and shadow and finish with the same colour deeper j mix¬ ing a little black to deaden it, especially in the darkest places. The second are laid with white, mixed with a very little lake and vermilion, in such a manner that these two last colours are hardly seen. Afterwards they shadow with black and a little lake, working redder in the middle of the leaves, next the stalks j which ought to be, as also the seed, of the same colour, parti¬ cularly towards the top 5 and at the bottom a little greener. The stile of the seed is laid with masticot, and sha¬ dowed with sap green. The other day lilies are done by putting a lay of pure white, and shadowing and finishing with black and white. The stalks of these last, and the greens of them all, are done with sea green, and shadowed with sap green. The Hyacinth, or Purple-flower.—There are four sorts of them : The blue, a little dark ; Others paler ; The gridelin 5 And the white. The first are laid with ultramarine and white; and shadowed and finished with less white. Others are laid and shadowed with pale blue. The gridelines are formed with lake and white, and a very small mat¬ ter of ultramarine j and finished with the same colour a little deeper. For the last they put a lay ol white j then they shadow them with black, with a little white j and finish them all by strokes and traces, following the turnings and windings of the leaves. The green and the stalks of such as are blue, are done with sea and lily green very dark : and in the stalks of the first may be mixed a little carmine, to make them red¬ dish. The stalks of the two others, as also the green, VII. MI NIA T U R are formed with Verditer and masticot, and shadoAved with sap green. The Piony.—A lay of Venice lake and white must be put on all parts, pretty strong : then shadow with less white, and with none at all in the darkest places: after which finish with the same colour by traces, turning them as for the rose} gumming it very much in the deepest of the shades ; and x-aising the lights and the edges of the most lightsome leaves with white and a little lake. Little veins ax-e likewise made, which go like the strokes in hatching, but are more visible. The green of this flower is done with sea green, and shadowed with sap green. Cowslips.—They are of four or five coloui’s. There are some of a very pale purple. The gridelin. The white and the yellow. The purple is done with ultramarine, carmine, and white $ putting less white for shadowing. The gride¬ lin is laid with Venice lake, and a very small matter of ultramarine, with much white ; and shadorved with the same colour deeper. For the white a lay of white must he put 5 and they must be shadowed with black and white ; and finished, as the others, by traces or strokes. The heart of these cowslips is done with masticot in the shape of a stai*, which is shadowed with gamboge, making a little circle in the middle with sap green. iThe yellow ax-e laid with nxasticot, and shadow¬ ed with gamboge and umber. The stiles, the leaves, and the buds, ax-e formed with verditer, mixed with a little masticot, and finished with sap gx-een ; making the fibres or veins, which appear upon the leaves, with this same colour; and heightening the lights of the largest with nxasticot. The IIanunculus, or Crow-foot.—Thex-e are se¬ veral sorts of them : the finest are the orange-coloured. For the first, they put a lay of vermilion, with a very small matter of gamboge; and add carmine for sha¬ dowing ; finishing it with this last colour, and a little gallstone. In the others may be put Venice lake in¬ stead of carmine, especially in the heart of the flower. The orange-coloured are laid w-ith gamboge, and finish¬ ed with gallstone, vermilion, and a little carmine $ leav¬ ing some little yellow streaks. The gi’een of the stalks is done with vex-diter and very pale masticot; mixing lily green to shadow them. That of the leaves is a little darker. The Crocus.—These are of two colours : Yellow and purple. The yellow are formed with masticot and gallstone, and shadowed with gamboge and gallstone: after which, upon each leaf, on the outside, are made three streaks, separate from one another, with bistre and pure lake ; which are lost, by little tx-aces, in the bottom. The outside of the leaves is left all yellow.—The purple is laid with cai-- nxine, mixed with a little ultramarine, and very pale white. They are formed and finished with less white ; making likewise, in some, purple stripes or sti-eaks, very dark, as in the yellow } and in others only small veins. The seed of both is yellow, and is done with orpiment and gallstone. For the stiles, they put a lay of white, and shadow with black, mixed with a little green. The green of this flower is formed with very pale verditer, and shadowed with sap-green. The Iris.—The Persian iris is done by putting, for the inside leaves, a lay of white, and shadowing E PAINTING. 269 them with indigo and green together, leaving a little Of white separation in the middle of each leaf j and for Flowers, those on the outside, they put in the same place a lay of masticot, which is shadowed with gallstone and orpiment j making little dark and longish dots over all the leaf, at a small distance from one another. And at the end of each ai-e made large stains, with bistre and lake in some, and in others with pure indigo, but very black. The rest, and the outside of the leaves, are shadowed with black. The green is formed with sea green, and very pale masticot, and shadowed with sap green. The Susian iris is laid with purple and white, putting a little more carmine than ultramarine ; and for the shades, especially in the middle leaves, they put less white ; and, on the contrary, mox-e ultramarine than carmine ; making the veins of this very colour, and leaving in the middle of the inside leaves a little yellow sinew. There are others which have this very sinew in the first leaves -, the end of which only is bluer than the xest. Others are sha¬ dowed and finished with the same purple, redder: They have also the middle sinew on the outside leaves j but white and shadowed with indigo. There are like¬ wise yellow ones ; which are done by putting a lay of masticot and orpiment j shadowing them with gallstone, and making the veins upon the leaves with bistx-e. The gx-een of one and the other is done with sea green, mix¬ ing a little masticot for the stiles. They are shadowed with sap green. The Jasmine.—It is done with a lay of white, and shadowed with black and white ; and for the outside of the leaves, they mix a little bistre j making the half of each, on this side, a little reddish with carmine. The Tuberose.—For the doing of this, they make a lay of white, and shadow with black, with a little bistre in some places ; and for the outside of the leaves they mix a little carmine, to give them a i*eddish teint, particularly upon the extremities. The seed is done with masticot, and shadowed with sap green. The green of it is laid with verditer, and shadowed with sap green. The Hellebore.—The flower of hellebox-e is done almost in the same manner ; that is, let it be laid with white, and shadowed with black and bistre, making the outside of the leaves a little reddish here and there. The seed is laid with dax-k green, and raised with masticot. The green of it is foul and rxxsty, and is formed with verditer, masticot, and bistre ; and finish¬ ed with sap green and bistre. The White Lily.—It is laid with white, and sha¬ dowed with black and white. The seed is done with orpiment and gallstone. And the green is done as in the tubex-ose. The Snow-drop.—It is formed and finished as the white lily. The seed is laid with masticot, and sha¬ dowed with gallstone. And the green is done with sea and sap green. The Jonquil.—It is laid with masticot and gall¬ stone, and finished with gamboge and gallstone. The green is formed with sea green, and shadowed with sap green. The Daffodil.—All daffodils, the yellow, the double, and the single, are done by putting a lay of masticot : they are formed with gamboge, and finished by adding umber and bistre ; excepting the bell in the middle, which is done with orpiment and gallstone, bordered MINIATURE PAINTING. Of bordered or edged with vermilion and carmine. The Flowers, white are laid with white, and shadowed with black v and white } excepting the cop or bell, which is done with masticot and gamboge. The green is sea green, shadowed with sap green. The Marigold.—It is done by putting a lay of masticot, and then one of gamboge •, shadowing it with this very colour, after vermilion is mixed with it : and for finishing, they add gallstone and a little carmine. The green is done with verditer, shadowed with sap green. The Austrian Rose.—For making the Austrian rose, they put a lay of masticot, and another of gam¬ boge. Then they form it, mixing gallstone 5 and finish it with the last colour, adding bistre and a very small matter of carmine in the deepest shades. The Indian Pink, or French Marigold.—It is done by putting a lay of gamboge ; shadowing it with this colour, after you have mixed a good deal of carmine and gallstone with it j and leaving about the leaves a little yellow border of gamboge, very clear in the lights, and darker in the shades. The seed is shadow¬ ed with bistre. The green, as well of the rose as the pink, is formed with verditer, and finished with sap- green. The Sun-FLOWER.—It is formed with masticot and gamboge, and finished with gallstone and bistre. The green is laid with verditer and masticot, and shadowed with sap green. The Passion flower.—It is done as the rose, and the green of the leaves likewise j but the veins are done with a darker green. Poetical Pinks and Sweet WilliAM.-^They are done by putting a lay of lake and white ; shadowing them with pure lake, with a little carmine for the last; which are afterwards dotted on all parts with little round dots, separate from one another •, and the threads in the middle are raised with white. The green of them is sea green, which is finished with sap green. The Scabious.—There are two sorts of scabious, the red and the purple. The leaves of the first are laid with Florentine lake in which there is a little white ; and shadowed without white. 5 and for the middle, which is a great boss or husk in which the seed lies, it is formed and finished with pure lake, with a little ultramarine or indigo to make it darker. Then they make little white longish dots over it, at a pretty distance from one another, clearer in the light than in the shade, making them go every way. The other is done by putting a lay of very pale purple, as well upon the leaves as the boss in the middle ; shadowing both with the same colour, a little deeper : and instead of little white touches for the seed, they make them pur¬ ple ; and about each grain they make out a little circle, and this over the whole boss or husk in the middle. The green is formed with verditer and masticot, and shadowed with sap green. The Sword or Day Lily.—It is laid with Florence lake and very pale white •, formed and finished with pure lake, very clear and bright in some places, and very dark in others •, mixing even bistre in the thickest of the shades. The green is verditer, shadow'ed with sap green. Hepatica, or Liverwort.—There is red and blue. The last is done by putting on all parts a lay of ultra- Sect. marine, white, and a little carmine or hike: shadow¬ ing the inside of the leaves with the mixture, but F deeper 5 excepting those of the first rank •, for which, and for the outside of every one of them, they add indi¬ go and white, that the colour may be paler, and not so fine. The red is laid with lake columbine and very pale white *, and finished with less white. The green is done with verditer, masticot, and a little bistre j and shadowed with sap green, and a little bistre, especially on the outside of the leaves. The Pomegranate.—The flower of the pomegra¬ nate is laid with red lead *, shadowed with vermilion and carmine > and finished with this last colour. The green is laid with verditer and masticot, and shadowed with sap green. The flower of the Indian Bean.—It is done with a lay of Levant lake and white ; shadowing the middle leaves with pure lake ; and adding a little ultramarine for the others. The green is verditer, shadowed with sap green. The Columbine.—There are columbines of several colours : the most common are the purple, the gridelin, and the red. For the purple, they lay with ultrama¬ rine, carmine, and white } and shadow with this mix¬ ture deeper. The gridelin are done the same way, putting a great deal less ultramarine than carmine. The red are done with lake and white, finishing with less white. There are some mixed flowers of this kind, of several colours ; which must he formed and finished as the others, but paler, making the mixtures of a little darker colour. The Lark’s Heel.—These are of different colours, and of mixed colours : the most common are the pur¬ ple, the gridelin, and the red 5 which are done as the columbines. Violets and Pansies.—Violets and pansies are done the same way ; excepting that in the last the two middle leaves are bluer than the others ; that is, the borders or edges j for the inside of them is yellow : and there little back veins are made, which take their be¬ ginning from the heart of the flower, and die away to- W’ards the middle. The Muscipula, or Catch-fly.—There are two sorts of it, the white and the red j the last is laid with lake and white, with a little vermilion, and finished with pure lake. As for the knot or nozzle of the leaves, it is formed with white and a very small matter of vermilion, mixing bistre or gallstone to finish it. The leaves of the white are laid with white j adding bistre and masticot upon the knots which are shadowed with pure bistre, and the leaves with black and white. The green of all these flowers is done with verditer and masticot, and shadowed with sap green. The Crown Imperial,—which is of two colours, the yellow and the red. The first is done by putting a lay of orpiment, and shadowing it with gallstone and orpiment with a little vermilion. The other is laid with orpiment and vermilion, and shadowed with gallstone and vermilion , making the beginning of the leaves next the stile, with lake and bistre, very dark 5 and veins with this mixture both in one and the other, all along the leaves. T he green is done with verditer and masticot, shadowed with sap green and gamboge. The Cyclamen, or Sowbread.—The red is laid with tot. VII. MINIATURE PAINTING. Of with carmine, a little ultramarine, anil much white ; owers. and finished with the same colour, deeper; putting, in a manner, only carmine in the middle of the leaves, next the heart, and in the rest add a little more ultra- marine. The other is laid with white, and shadowed with black. The stalks of one and the other ought to he a little reddish 5 and the green, verditer and sap green. The GlLLlFLOWER.—There are several sorts of gil- liflowers *, the white, the yellow, the purple, the red, and the mixed of various colours. The white are laid with white, and shadowed with black, and with a little indigo in the heart of the leaves. The yellow, with masticot, gamboge, and gallstone. The purple are form¬ ed w'ith purple and white ; and finished with less white j making the colour brighter in the heart, and even a lit¬ tle yellowish. The red with lake and white j finishing them with white. The mixed coloured are laid with white, and the mixtures are sometimes made with pur¬ ple, in which there is much ultramarine ; others again, in which there is more carmine. Sometimes they are of lake, and sometimes of carmine. Some are done with white, and others without white ; shadowing the rest of the leaves with indigo. The seed of all is form¬ ed with verditer and masticot, and finished with sap green. The leaves and stiles are laid with the same green, mixing sap green to finish them. Fruits, fishes, serpents, and all sorts of reptiles, are to be touched in the same manner as the figures of men are; that is, hatched or dotted. Birds and all other animals are done like flowers, by strokes or traces. Never make use, for any of these things, of white lead. It is only proper in oil. It blackens like ink when only tempered with gum $ especially if you set your work in a moist place, or where perfumes are. Ceruss of Venice is as fine, and of as pure a white. Be not sparing in the use of this, especially in forming or dead-colouring} and let it enter into all your mix¬ tures, in order to give them a certain body, which will render your work gluish, and make it appear soft, of plump, and strong. Flowers. The taste of painters is, nevertheless, different in this ’ ”"v point. Some use a little of it, and others none at all. But the manner of the last is meagre and dry. Others use a great deal j and doubtless it is the best method, and most followed among skilful persons 5 for besides that it is speedy, one may by the use of it copy all sorts of pictures •, which would be almost impossible otherwise ; notwithstanding the contrary opinion of seme, who say, that in miniature avc cannot give the force and all the different teints we see in pieces in oil. But this is not true, at least of good painters; and effects prove it pretty plainly: forwe see figures, landscapes,pictures,andeveiy thing else in miniature, touched in as grand, as true, and as noble a manner (though more tender and deli¬ cate), as they are in oil. Howrever, painting in oil has its advantages j were they only these, that it exhibits more work, and takes up less time. It is better defended likewise against the injuries of time} and the right of birth must be granted it, and the glory of antiquity. But miniature likewise has its advantages 5 and with¬ out repeating such as have been mentioned already, it is neater and more commodious. You may easily carry all your implements in your pockets, and work when and wherever you please, without such a number of preparations. You may quit and resume it when and as often as you will } which is not done in the other} in which one is rarely to work dry. To conclude : In the art of painting, excellence does not depend upnn the greatness of the subject, but upon the manner in which it is handled. Some catch the airs of a face well} others succeed better in land¬ scapes : some work in little, who cannot do it in large t some are skilled in colours, who know little of design : others, lastly, have only a genius for flowers : and even, the Bassans got themselves a fame for animals} which they touched in a very fine manner, and better than any. thing else. M I N linim MINIM, in Music, a note equal to two crotchets, 1.1 or half a semibreve. See Music. rter;. MINIMS, a religious order in the church of Rome, * founded by St Francis de Faula, towards the end of the 15th century. Their habit is a coarse black wool¬ len stuff, with a woollen girdle, of the same colour, tied in five knots. They are not permitted to quit their habit and girdle night nor day. Formerly they went barefooted, but are now allowed the use of shoes. MINIMUM, in the higher geometry, the least quantity attainable in a given case. MINISTER, a person who preaches, performs re¬ ligious worship in public, administers the sacraments, &c. MimsTEn of State, a person to whom the prince in¬ trusts the administration of government. See CouN- CJL. M I N Foreign Minister, is a person sent into a foreign Minister country, to manage the affairs of his province or of II . the state to which he belongs. Of these there are two 1 m kinds : those of the first rank are ambassadors and en¬ voys extraordinary, who represent the persons of their sovereigns*, the ministers of the second rank are the or¬ dinary residents. MINIUM, or Red-lead. See Chemistry In¬ dex. MINNIN, a stringed instrument of music among the ancient Hebrews, having three or four chords to it, although there is reason to question the antiquity of this instrument} both because it requires a hair bow, which was a kind of plectrum not known to the an¬ cients, and because it so much resembles the modern viol. Kircher took the figures of this, the machul, chinnor, and psaltery, from an old book in the Vatican library. MINOR, MIN [ 272 ] M I N Minor, Minorca. MINOR, a Latin term, literally denoting less ; used in opposition to major, greater. 1 Minor, in Law, denotes a person under age •, or who, by the laws of the country, is not yet arrived at the power of administering his own affairs, or the posession of his estate. Among us, a person is a mi¬ nor till the age of twenty-one, before which time his acts are invalid. See Age, and Infant. It is a maxim in the common law, that in the king there is no minority, and therefore he hath no legal guardian', and his royal grants and assents to acts of parliament are good, though he has not in his natural capacity attained the legal age ot twenty-one. It is also provided by the custom and law ot parliament, that no one shall sit or vote in either house unless he be twenty-one years of age. This is likewise expressly declared by stat. 7 ancl ^ Will. III. cap. 25. with re¬ gard to the house of commons. Minor in Logic, is the second proposition of a for¬ mal or regular syllogism, called also the assumption. Minor, in Music, is applied to certain concords, which difter from or are lower than others of the same denomination by a lesser semitone or four commas.— Thus we say, a third minor, or lesser third, or a sixth major and minor. Concords that admit of major and minor, 1. e. greater and less, are said to be imperfect concords. MINORCA, an island of the Mediterranean, si¬ tuated between 39 and 40 degrees of north latitude, and near four degrees of east longitude. It is about 33 miles in length from north-west to south-east, in breadth from eight to twelve, but in general about ten miles •, so that in size it may nearly equal the county of Huntingdon or Bedfordshire. The form is very irregu¬ lar ; and the coasts are much indented by the sea, which forms a great number of little creeks and inlets, some of which might be very advantageous. This island is one of those called by the ancient Ro¬ mans JBaleares, which arose from the dexterity ot the inhabitants in using the sling. It fell under the power of the Romans, and afterwards of the northern barba¬ rians. From them it was taken by the Arabs *, w’ho were subdued by the king of Majorca, and he by the king of Spain. The English subdued it in 1708 5 it was afterw’ards retaken by the French in i75^> restored to Britain by the treaty of Paris in 1763. The Spaniards took it in 1782 j the British regained it in 1798; but it was given up in 1802, and continues in the possession of Spain. The air of this island is much more clear and pure than in Britain •, being seldom darkened with thick fogs ; yet the low valleys are not free from mists and un¬ wholesome vapours ^ and in windy weather the spray of the sea is driven over the whole island. Hence it hap¬ pens that utensils of brass or iron are extremely suscep¬ tible of rust, in spite of all endeavours to preserve them ; and household furniture becomes mouldy. The sum¬ mers are dry, clear, calm, and excessively hot •, the au¬ tumns moist, warm, and unequal $ at one time perfectly serene, at another cloudy and tempestuous. During the winter there are sometimes violent storms, though nei¬ ther frequent nor of long continuance; and whenever they cease, the weather returns to its usual serenity. The spring is always variable, but resembles the winter score than the summer. The changes of heat and cold are neither so great nor so sudden in this climate as in ]\,jjnf)rcSt many others. In the compass of a year, the thermo--v— meter seldom rises much above the 8oth, or falls be¬ low the 48th degree. In summer there is scarcely ever a difference of four or five degrees between the heat of the air at noon and at night; and in winter the varia¬ tion is still less considerable. But this must be under¬ stood of a thermometer shaded from the influence of the solar beams : for if exposed to them it will often rise 12, 14, or 16 degrees higher than what we have mentioned ; and in other seasons the difference between the heat of the air in the sun and the shade is much greater. Yet even in the dog-days, the heat ot the atmosphere, at least in open places, seldom surpasses that of human blood. The winds are very boisterous about the equinoxes, and sometimes during the winter. At other times they are generally moderate, and, according to the observations of seamen, they rarely blow in the same direction near the islands adjacent to the gulf of Lyons as in the open sea. During the summer there is commonly a perfect calm in the mornings and even¬ ings ; but the middle of the day is cooled by refreshing breezes which come from the east, and following the course of the sun, increase gradually till two or three in the afternoon, after which they insensibly die away as night approaches. This renders the heat of the sun less dangerous and inconvenient ; and if these breezes intermit for a day or two, the natives grow languid and inactive from the heat. The northerly winds in general are clear and healthy, dispel the mists, and make a clear blue sky ; whilst those which blow from the opposite quarter, render the air warm, moist, and unhealthy. The north wind is superior in power to all the rest; which appears from hence, that the tops of all the trees incline to the south, and the brandies on the north side are bare and blasted. „_The next to it in force is the north-west. Both are frequent towards the close of winter and in the spring; and, being dry and cold, they shrivel up the leaves of the vegetables, de¬ stroy their tender shoots, and are often excessively de¬ trimental to the vineyards and rising corn. The pier¬ cing blasts at that season from the north-east, as they are more moist, and more frequently attended with rain, are less prejudicial. The south and south-east winds are by much the most unhealthy. In whatever seasons they blow, the air is foggy, and affects the breathing; but in the summer season they are sultry and suffocating. An excessive dejection of spirits is then a universal complaint; and on exposing the ther¬ mometer to the rays of the sun, the mercury has fre¬ quently risen above the 100th degree. rIhe west wind is usually drier than the south : the east is cold and blustering in the spring, and sultry in the summer. The weather in Minorca is generally fair and dry ; hut when it rains, the shoivers are heavy, though of short continuance, and they fall most commonly in the night. The sky in summer is clear, and of a beautiful azure, without clouds or rain ; but moderate dews de¬ scend regularly after sunset. In autumn the weather becomes less serene ; whirlwinds and thunder become frequent; and in the night time lightning, and those meteors called falling stars, are very common. Water spouts also are often seen at that season, and frequently break upon the shore. A sudden alteration in the wea¬ ther takes place about the autumnal equinox ; the skies are M 1 IN [2 . are darkened with clouds, and the rains fall in such quantities, that the torrents thereby occasioned, pour¬ ing down from the hills, tear up trees by the root, car¬ ry away cattle, break dowm fences, and do considerable mischief to the gardens and vineyards. But these anni¬ versary rains arc much more violent than lasting ; al¬ ways falling in sudden and heavy shou'ers, rvith inter¬ vals of fair weather. They are accompanied with thunder, lightning, and squalls of wind, most common¬ ly from the north. Hail and snow are often intermix¬ ed with the rains which fall in winter and in spring ; but tile snow, for the most part, dissolves immediately j and ice is here an uncommon appearance. The whole coast of Minorca lies low 5 and there are only a few hills near the centre, of which the most con¬ siderable, named Toro by the inhabitants, may be seen at the distance of 12 or 14 leagues from the land. The surface of the island is rough and unequal 5 and in many places divided by long narrow vales of a considerable depth, called barancoes by the natives. They begin towards the middle of the island, and after several windings terminate at the sea. The south west side is more plain and regular than towards the north-east; where the hills are higher, with low marshy valleys be¬ twixt them, the soil less fruitful, and the whole tract unhealthy to man and beast. Near the towns and vil¬ lages the fields are well cultivated, and enclosed with stone walls ; but the rest for the most part are rocky', or covered with woods and thickets. There are some pools of standing water, but very few rivulets, which is the greatest defect about the island, as the inhabi¬ tants have scarcely any wholesome water excepting what is saved from the clouds. The soil is light, thin, and very stony, with a good deal of sea salt, and, in some places, of calcareous nitre intermixed. In most places there is so little earth, that the island appears to be but one large irregular rock, co¬ vered here and there with mould, and an infinite variety of stones. Notwithstanding this, however, it is not only extremely proper for vineyards, but produces more wheat and barley than could at first sight be imagined j and if the peasants may be credited, it would always yield a quantity of corn and wine sufficient for the na¬ tives, did not the violence of the winds, and the exces¬ sive drought of the weather, frequently spoil their crops. The fields commonly lie fallow for two years, and are sown the third. About the latter end of winter, or the beginning of spring, they are first broke up : and next autumn, as soon as the rains fall, they are again plough¬ ed and prepared for receiving the proper seeds. The tillage is very easily performed ; for a plough so light as to be transported from place to place on the plough¬ man’s shoulder, and to be drawn by a heifer, or an ass sometimes assisted by an hog, is sufficient for opening so thin a soil. The later the harvest happens, the more plentiful it proves. The barley is usually cut down about the 20th of May and the wheat is reaped in June, so that the whole harvest is commonly got in by Midsummer day. The grain is not thrashed with flails as in this country, but trodden out ou a smooth piece of rock by oxen and asses, according to the cus¬ tom of the eastern nations. The natives of Minorca are commonly lean, thin, and well-built, of a middle stature, and olive com- Vol. XIV. Part I. j- 73 J MIN plexion ; but their character is by no means agree- Minorca. able. Such is the natural impetuosity of their temper, ' /-— that the slightest cause provokes them to anger, and they seem to be incapable of forgiving or forgetting any injury. Hence quarrels break out daily, even among neighbours and relations: and family disputes are trans¬ mitted from father to son j and thus, though lawyers and pettifoggers are very numerous in this country, lucre are stilt too few for the clients. Both sexes are, by constitution, extremely amorous : they are often be¬ trothed to each other w’hile children, and marry at the age of 14. I he w omen have easy labours, and com¬ monly return in a few days to their usual dorfiestic bu¬ siness j but, lest the family should become too numer¬ ous for their income, it is a practice among the poorer sort to keep their children at the breast for two or three years, that by this means the mothers may be hindered from breeding. Bread of the finest wheat flour, well fermented and well baked, is more than half the diet of people of all ranks. Rice, pulse, vermicelli, herbs and roots from the garden, summer fruits, pickled olives and pods of the Guinea pepper, make up almost all the other half, so that scarce a fifth of their whole food is furnished from the animal kingdom, and of tins fish makes by much the most considerable portion. On Fridays, and other fast days, they abstain entirely from flesh ; and during Lent they live altogether on vegetables and fi^h, excepting Sundays, when they are permitted the use of eggs, cheese, and milk. Most of their dishes are high-seasoned with pepper, cloves, cinnamon, and other spices; and garlic, onions, or leeks, are almost constant ingredients. They eat a great deal of oil, and that none of the sweetest or best flavoured j using it not only with salads, but also with boiled and fried fish, greens, pulse, &c. instead of butter. A slice of bread soaked in boiled water, with a little oil and salt, is the common breakfast of the peasants, well known by the name of o/eagua. Their ordinary meals are very frugal, and consist of very little variety ; but on festivals and other solemn occasions their entertainments are to the last degree profuse and extravagant, inso¬ much that the bill of fare of a country farmer’s wedding dinner would scarce be credited. M ith regard to other matters, the Minorquins are accused of prodigious indolence in the wTay of business, and neglect ol the natural advantages they possess. In the bowels of the earth are iron, copper, and lead ores, of none of which any use has been made except the last. A lead mine was worked to advantage some time ago, and the ore sent into France and Spain for the use of the potteries in those countries. The proprie¬ tor discontinued his work on some small discourage¬ ment ; and indeed it is said, that these people are of all mankind the most easily put out of conceit with an undertaking that does not bring them in mountains of present gain, or that admits of the slightest probabili¬ ty of disappointing their most sanguine expectations : nor will their purse admit of many disappointments $ and thus their poverty co-operating with their natural despondence and love of ease, is the principal cause of their backwardness to engage in projects, though ever so promising lor the improvement of their private for¬ tune, and the advantage of the commerce of their M m country. MIN [ 274 country. This lend ore went under the name of vernu among the natives, as it was wholly used by the potters in varnishing and glazing their earthen vessels. There are few "exports of any account, and they are obliged to their neighbours for near one-third ol their corn, all their oil, and such a variety of articles of less consideration, that nothing could preserve them from a total bankruptcy, but the English money circu¬ lated by the troops, which is exchanged for the daily supplies of provisions, increased by the multiplication of vineyards, the breeding of poultry, and the production of vegetables, in a proportion of at least live to one since the island has been in our possession. It will not require many words to enumerate their exports: they make a sort of cheese, little liked by the English, which sells in Italy at a very great price •, this, perhaps, to the amount of 800I. per annum.—The wool they send abroad may produce pool. more.—Some wine is expor¬ ted 5 and, if we add to its value that of the home con¬ sumption, which has every merit of an export, being nine parts in ten taken off by the troops for ready money, it may well be estimated at 16,oool. a-year. In honey, wax, and salt, their yearly exports may be about 4C0I. and this comes pretty near the sum ot their exports, which we estimate together at i8,iool. steiling per annum. A vast balance lies against them, if vve consider the variety and importance of the articles they fetch from other countries, for which they must pay ready cash. Here it may be necessary to withdraw some things from the heap, such as their cattle, sheep, and lowls, on which they get a profit j for the country does not produce them in a sufficient abundance to supply them, especially when we have a fleet ol men of war stationed there. Their imports are, corn, cattle, sheep, fowls, to¬ bacco, oil, rice, sugar, spices, hardware, and tools of all kinds ^ gold and silver lace j chocolate, or co¬ coa to make it; tobacco, timber, plank, boards, mill¬ stones, tobacco pipes, playing cards, turnery ware, seeds, soap, saddles; all manner of cabinetmakers work, iron spikes, nails, fine earthen ware, glass lamps, brasiery } paper, and other stationary wares j copperas, galls, dye stuffs, painters brushes and co¬ lours-, musical instruments, music, and strings j watches, wine, fruit, all manner of fine and printed linens, muslins, cambrics, and laces bottles, corks, starch, indigo, fans, trinkets, toys, ribbands, tape, needles, pins, silk, mohair, lanthorns, cordage, tar, pitch, ro¬ sin, drugs, gloves, fire-arms, gunpowder, shot, and lead; hats, caps, velvet, cotton stuffs, woollen cloths, stockings, capes, medals, vestments, lustres, pictures, images, agnus dei’s, books, pardons, bulls, relicks, and 'indulgences. The island is divided into what they style terminos, of which there were anciently five, now reduced to four, and resemble our counties. The tennino of Ciudadella, at the north-western extremity of the island, is so styled from this place, which was once a city, and the capital of Minorca. It makes a venerable and majestic figure, even in its present state of decay, having in it a large Gothic cathedral, some other churches and convents, the governor’s palace, and an exchange, which is no contemptible pile.—There are in it 600 houses, which, before the seat of government and the courts of justjce ] MIN were removed to Mahon, were fully inhabited; and Minor, there are still more gentlemen’s families here than in'—-v* all the rest of the island. It hath a port commodious enough for the vessels employed in the trade of this country, which, though in the possession of a maritime power, is less than it formerly rvas. It is still, in the style of our officers, the best quarters (and there aie none bad} in the country} and if there was a crvii go¬ vernment, and the place made a free port, the best jud¬ ges are of opinion it would very soon become a flouiish- ing place again ^ and the fortifications, it it should be found necessary, might then also be easily restored and improved. The termino of Fererias is the next, a narrow slip reaching cross from sea to sea, and the country little cultivated ; it is therefore united to Mercandal. In this last termino stands Mont-toro in the very centre of the isle, and the highest ground, some say the only moun¬ tain in it} on the summit of which there is a Convent, where even in the hottest months the monks enjoy a cool air, and at all times a most delightful prospect. About six miles north from Mont-toro stands the castle that covers Port-Fornelles, which is a very spacious harbour on the east side of the island. Iheie aie in it shoals and foul ground, which, to those who are unac¬ quainted with them, render it difficult and dangerous -, yet the packets bound Iron) Mahon to Marseilles fie- quently take shelter therein j and while the Spaniards were m possession of the isle, large ships and men ol war frequented it. At a small distance from this lies an¬ other harbour called A (ha, which runs far into the land y but being reputed unsafe, and being so near 1 ornelies, is at present useless. The country about it is, however, said to be the pleasantest and wholesomest spot in the island, and almost the only one plentifully supplied with excellent spring water-, so that the gardens are well laid out, and the richest and finest fruits grow here in the highest perfection. Alaior is the next teimino, in^ which there is nothing remarkable but the capital of the same name, well situated on an eminence, in a plea¬ sant and tolerably cultivated country. The termino of Mahon, at the south-east end of the island, is at present the most considerable of them all, containing about 60,000 English acres, and nearly o116* half of the inhabitants in Minorca. The town of Mahon derives its name from the Carthaginian general Mago, who is universally allowed to be its founder.— It stands on an eminence on the west side ol the har¬ bour, the ascent pretty steep. There are in it a large church, three convents, the governor’s palace, and some other public edifices. It is large, but the sheets are winding, narrow, and ill paved. The fortress (f St Philip stands near the entrance of the harbour, which it covers-, is very spacious, of great strength, with sub¬ terranean works to protect the garrison from bombs, large magazines, and whatever else is necessary to render it a complete fortification, and hath a numerous and well disposed artillery. Port Mahon is allowed to be the finest harbour in the Mediterranean, about 90 fa¬ thoms wide at its entrance, but within very large and safe, stretching a league or more into the land. Beneath the town of Mahon there is a very fine quay, one end of which is reserved for the ships of war, and furnished with alt the accommodations necessary lor careening and refitting them ; the other serves for merchantmen. MIN [ 275 ] MIN irca On the oilier side of the harbour is Cape Mola, where j] it 19 generally agreed a fortress might he constructed j.Uaur. which would he impregnable, as the castle of St Philip Tfi' was esteemed before we took it, and bestowed so much money upon it, that though some works were erected at Cape Mola, it was not judged proper to proceed in the fortifications there at a fresh expence ; at least this is the only reason that hath been assigned. Minorca was taken by the Spaniards during the American war, and is now in their possession. MINORS, or Friars Minor, an appellation which the Franciscans assume, out of show of humility ; calling themselves fratres minore,s\ i. e. lesser brothers, and sometimes minorites. There is also an order of regular minors at Naples, which was established in the year 1388, and confirmed by Sixtus V. MINOS, in Fabulous History, a king of Crete, son of Jupiter and Europa. He flourished about 1432 years before the Christian era. Fie gave laws to his subjects, which still remained in full force in the age of the philosopher Plato, about 1000 years after the death ol the legislator. His justice and moderation procured him the appellation of the favourite of the gods, the confidant of Jupiter, and the wise legislator, in every city of Greece *, and, according to the poets, he was rewarded for his equity after death with the office of supreme and absolute judge in the infernal regions. In this capacity he is represented sitting in the middle of the shades, and holding a sceptre in his hand. The dead plead their different causes before him ; and the impartial judge shakes the fatal urn, which is filled with the destinies of mankind. He married Ithona, by whom he had Lycastes, who was the father of Minos II. Minos II. was a son of I/ycastes, the son of Mi¬ nos I. and king of Crete. He married Pasiphae, the daughter of Sol and Perseis, and by her he had many children. He increased his paternal dominions by the conquest of the neighbouring islands ; but showed him¬ self cruel in the war which he carried on against the Athenians, who had put to death his son Androgeus. He took Megara by the treachery of Scylla J and not satisfied with victory, he obliged the vanquished to bring him yearly to Crete seven chosen boys and the same number of virgins to be devoured by the Mino¬ taur. This bloody tribute was at last abolished when Theseus had destroyed the monster. When Daedalus, whose industry and invention had fabricated the laby¬ rinth, and whose imprudence in assisting Pasiphae in the gratification of her unnatural desires, had offended Minos, fled from the place of his confinement with wings, and arrived safe in Sicily ; the incensed monarch pursued the offender, resolved to punish his infidelity. Cocalus, king ot Sicily, who had hospitably received I Daedalus, entertained his royal guest with dissembled friendship $ and, that he might not deliver to him a man whose ingenuity and abilities he so well knew, he put Minos to death. Minos died about 35 years before the Frojan war. He was father of Androgeus, Glau- cus, and Deucalion; and two daughters Pfuedra, and Ariadne. Many authors have confounded the two Minoses, the grandfather and the grandson 5 but Homer, Plutarch, and Diodorus, prove plainly that they were two different persons. MINOTAUR, in Fabulous History, a celebrated monster, half a man and half a bull, according to this Minotaur verse of Ovid, |j . . . . Minstrel. oemibovQmmte virum, semivirumque bovem. It was the fruit of Pasiphae’s amour with a bull. Mi¬ nos refused to sacrifice a white bull to Neptune, an animal which he had received from the god for that purpose. This offended Neptune, and he made Pa¬ siphae the wife of Minos enamoured of this fine bull, which had been refused to his altars. Daedalus prosti¬ tuted his talents in being subservient to the queen’s unnatural desires; and by his means, Pasiphae’s hor¬ rible passions were gratified, and the Minotaur came into the world. Minos confined in the labyrinth this monster, which convinced the world of his wife’s las¬ civiousness, and reflected disgrace upon his family. The Minotaur usually devoured the chosen young men and maidens which the tyranny of Minos yearly ex¬ acted from the Athenians. Theseus delivered his country from this tribute, when it had fallen to his lot to be sacrificed to the voracity of the Minotaur ; and by means of Ariadne, the king’s daughter, he de¬ stroyed the monster, and made his escape from the windings of the labyrinth.—The fabulous tradition of the Minotaur, and of the infamous commerce of Pasi¬ phae with a favourite bull, has been often explained. Some suppose that Pasiphae was enamoured of one of her husband’s courtiers called Taurus ; and that Dae¬ dalus favoured the passions of the queen, by suffering his house to become the retreat of the two lovers. Pasiphae some time after brought twins into the world, one of whom greatly resembled Minos and the other Taurus j and in the natural resemblance of their coun¬ tenance with that of their supposed fathers, originated their name, and consequently the fable of the Mino¬ taur. MINOW, a very small species of cyprinus. See Ichthyology Index. MINSTER, (Saxon, My ns ter or Mynstre'), ancient¬ ly signified the church of a monastery or convent. J MINSTREL, an ancient term for a singer and in¬ strumental performer. The word minstrel is derived from the French mcnc- strier, and was not in use here before the Norman con¬ quest. It is remarkable that our old monkish histo¬ rians do not use the words cithareedus, cantator or the like, to express a minstrel\n Latin j but either mimus, histrio,joculator, orsome otherword that impliesgwtom Flence it should seem that the minstrels set oft’ their singing by mimicry or action 5 or, according to Dr Brown’s hypothesis, united the powers of melody, poem, and dance. The Saxons as well as the ancient Danes, had been accustomed to hold men of this profession in the high¬ est reverence. Their skill was considered as something divine, their persons were deemed sacred, their atten¬ dance was solicited by kings, and they were every¬ where loaded with honours and rewards. In short, poets and their art were held among them in that rude admiration which is ever shown by an ignorant people to such as excel them in intellectual accomplishments. When the Saxons were converted to Christianity, in proportion as letters prevailed among them this rude admiration began to abate, and poetry wras no longer a peculiar profession. The poet and the minstrel be- M m 2 came MIN Minstrel, came two persons. Poetry was cultivated by men of v-"1 ■ letters indiscriminately, and many of the most popular ' rhymes were composed amidst the leisure and retire¬ ment of monasteries. But the minstrels continued a distinct order of men, and got their livelihood by sing¬ ing verses to the harp at the houses of the great. There they were still hospitably and respectfully re¬ ceived, and retained many of the honours shown to their predecessors the Bards and Scalds. And in¬ deed, though some of them only recited the composi¬ tions of others, many of them still composed songs themselves : and all of them could probably invent a few stanzas on occasion. There is no doubt but most of the old heroic ballads were produced by this order of men. For although some of the larger metrical romances might come from the pen of the monks or others, yet the smaller narratives were probably com¬ posed by the minstrels who sung them. From the amazing variations which occur in different copies of these old pieces, it is evident they made no scruple to alter each other’s productions, and the reciter added or omitted whole stanzas according to his own fancy or convenience. In the early ages, as is hinted above, this profession was held in great reverence among the Saxon tribes, as well as among their Danish brethren. This appears from two remarkable facts in history, which show that the same arts of music and song were equally admired among both nations, and that the privileges and honours conferred upon the professors of them were, common to both 5 as it is well known their customs, manners, and even language, were not in those times very dis¬ similar. When King Alfred the Great was desirous to learn the true situation of the Danish army, which had in¬ vaded his realm, he assumed the dress and character of a minstrel; and taking his harp, and only one attend¬ ant (for in the earliest times it was not unusual for a minstrel to have a servant to carry his harp), he went with the utmost security into the Danish camp. And though he could not hut be known to he a Saxon, the character he had assumed procured him an hospitable reception •, he was admitted to entertain the king at table, and staid among them long enough to contrive that assault which afterwards destroyed them. This was in the year 878. About 60 years after, a Danish king made use of the same disguise to explore the camp of King Athel- stan. With his harp in his hand, and dressed like a minstrel, Ardaff king of the Danes went among the Saxon tents, and taking his stand near the king’s pa¬ vilion, began to play, and was immediately admitted. There he entertained Athelstan and his lords with his singing and his music; and was at length dismissed with an honourable reward, though his songs must have discovered him to have been a Dane. Athel¬ stan was saved from the consequences of this stratagem by a soldier, who had observed Anlaff bury the money which had been given him, from some scruple of ho¬ nour or motive of superstition. This occasioned a dis¬ covery. From the uniform procedure of both these kings, it is plain that the same mode of entertainment prevailed among both peoples, and that the minstrel was a pri¬ vileged character among both. Even as late as the M 1 N reign of Edward II. the minstrels were easily admitted Jibuti into the royal presence, as appears from a passage ift ——y Stow, which also shows the splendour of their appear¬ ance. “ In the year 1316, Edward II. did solemnize his feast of Pentecost at Westminster, in the great hail y where sitting x-oyally at the table with his peers about him, there entered a woman adorned like a minstrel, sitting on a great horse trapped, as minstrels then used, who rode round about the tables, showing pastime ; and at length came up to the king’s table and laid before him a letter, and forthwith turning her horse, saluted every one, and departed.”—The subject of this letter was a remonstrance to the king on the favours heaped by him on his minions, to the neglect of his knights and faithful servants. The messenger was sent in a minstrel’s habit, as what would gain an easy admission ; and was a woman con¬ cealed under that habit, probably to disarm the king’s resentment; for we do not find that any of the real minstrels were of the female sex ; and therefore con¬ clude this was only an artful contrivance peculiar to that occasion. In the 4th year of Richard II. John of Gaunt erected at Tetbury in Staffordshire a court of minstrels, with a full power to receive suit and service from the men of that profession within five neighbouring coun¬ ties, to enact laws, and determine their controversies $ and to apprehend and arrest such of them as should re¬ fuse to appear at the said court, annually held on the 16th of August. For this they had a charter, by which they were empowered to appoint a king of the min¬ strels with four officers to preside over them. These were every year elected with great ceremony j the whole form of which is described by Dr Plott; in whose time, however, they seem to have become mere musicians. Even so late as the reign of King Henry VIII. the reciters of verses or moral speeches learnt by heart, in¬ truded without ceremony into all companies j not only in taverns, but in the houses of the nobility themselves. This we learn from Erasmus, whose argument led him only to describe a species of these men who did not sing their compositions j but the others that did, enjoyed without doubt the same privileges. We find that the minstrels continued down to the reign of Elizabeth j in w hose time they had lost much of their dignity, and were sinking into contempt and neglect. Yet still they sustained a character far superior to any thing we can conceive at present of the singers of old ballads. When Queen Elizabeth xvas entertained at Killing- worth castle by the earl of Leicester in 1575, among the many devices and pageants which were exhibited for her entertainment, one of the personages introduced was that of an ancient minstrel, whose appearance and dress are so minutely described by a writer there pre¬ sent, and gives us so distinct an idea of the character, that we shall quote the passage at large. “ A person very meet seemed he for the purpose, of a xlv. years old, apparelled partly as he would himself. His cap oft : his head seemingly rounded tonsterwise : fair kembed, that, with a sponge daintly dipt in a little capon’s grease, was finely smoothed, to make it shine like a mallard’s wing. His beard snugly shaven ; [ 276 1 iistrel, ilint. MIN [2 sliaven : and yet his shirt after the new trink, with ruffs fair starched, sleeked, and glistex-ing like a pair of new 1 shoes, marshalled in good order with a setting stick, and strut, ‘ that’ every ruff stood up like a wafer. A side [i. e. long] gown of Kendale green, after the fresh¬ ness of the year now, gathered at the neck with a nar¬ row gorget, fastened afore with a white clasp and a keeper close up to the chin ; but easily, for heat, to undo when he list. Seemingly begirt in a red caddis girdle : from that a pair of capped Sheffield knives hanging a’ two sides. Out of his bosom drawn from a lappet of his napkin edged with a blue lace, and marked with a D for Damian j for he was but a bache¬ lor yet. “ His gown had side [i. e. long] sleeves down to midleg, slit from the shoulder to the hand, and lined with white cotton. His doublet sleeves of black wor¬ sted : upon them a pair of points of tawny chamlet laced along the wrist with blue threaden pointes. A weak towards the hands of fustian-a-napes. A pair of red neather stocks. A pair of pumps on his feet, with a cross cut at his toes for corns j not new indeed, yet cleanly blackt with soot, and shining as a slicing horn. “ About his neck a i-ed ribband suitable to his girdle. His harp in good grace dependent before him. His wrest tyed to a green lace and hanging by : under the gorget of his gown a fair flaggon chain (pewter for) silver, as a Squire Minstrel of Middlesex, that travelled the country this summer season, unto fair and worship¬ ful men’s houses. From his chain hung a scutcheon, with metal and colour, resplendent upon his breast, of the ancient arms of Islington.” —This minstrel is described as belonging to that village. We suppose such as wei’e retained by noble families wmre their arms hanging down by a silver chain as a kind of badge. From the expression of Squire Minstrel above, w'e may conclude there were other in¬ ferior orders, as Yeomen Minstrels or the like. This minstrel, the author tells us a little belowr, “ after three lowly courtesies, cleared his voice with a hem . .. and wiped his lips with the hollow of his hand for ’filing his napkin 5 tempered a string or two with his wrist; and, after a little warbling on his harp for a prelude, came forth with a solemn song, warranted for stoi-y out of King Arthur’s acts, &.c.” Towards the end of the 16th century, this class of men had lost all credit, and were sunk so low in the public opinion, that in the 39th year of Elizabeth a statute was passed by which “ minstrels,” wandering abroad, were included among “ rogues, vagabonds, and sturdy beggars,” and were adjudged to be punished as such. This act seems to have put an end to the pro¬ fession, for after this time they are no longer mentioned. MINT, the place in which the king’s money is coined. See Coinage. There were anciently mints in almost every county in England ; but the only mint at present in the Bri¬ tish dominions is that in the Tower of London. The officers of the mint are, 1. The warden of the mint, who is the chief; he oversees the other officers, and receives the bullion. 2. The master worker, who re¬ ceives bullion from the wardens, causes it to be melted, delivers it to the moneyers, and, when it is coined, receives it again. 3. The comptroller, who is the 77 ] MIN overseer of all the inferior officers, and sees that all the money is made to the just assize. 4. The assay master, who weighs the gold and silver, and sees that it is according to the standard. 5. The two auditors who take the accounts. 6. The surveyor of the melting 5 who, after the assay master has made trial of the bul¬ lion, sees that it is cast out, and not altered after it is delivered to the meltei’. 7. The engraver ; who en¬ graves the stamps and dies for the coinage of the mo¬ ney. 8. The clerk of the irons } who sees that the irons ai’e clean and fit to work with. 9. The melter, who melts the bullion before it be coined. 10. The provost of the mint; who provides for and oversees all the moneyers. 11. The blanchers, who anneal and cleanse the money. 12. The moneyers j some of whom forge the money, some share it, some round and mill it, and some stamp and coin it. 13. The porters who keep the gate of the mint. Mint was also a pretended place of privilege, in Southwark, near the King’s Bench, put down by- statute. If any persons, within the limits of the mint, shall obstruct any officer in the serving of any writ or process, &c. or assault any person therein, so as he receive any bodily hurt, the offender shall be guilty of felony, and be ti-ansported to the plantations, &c. Stat. 9. Geo. I. Mint Marks. It hath been usual, fx-om old time, to oblige the masters and workers of the mint, in the indentures made with them, “ to make a privy mai’k in all the money that they made, as well of gold as of silver, so that another time they might know, if need were, and witte which moneys of gold and silver among other of the same moneys, were of their owm making, and which not.” And whereas, after every trial of the pix at Westminster, the masters and work¬ ers of the mint, having there proved their moneys to be lawful and good, were immediately entitled to x-e- ceive their quietus under the great seal, and to be dis¬ charged from all suits or actions concerning those moneys, it wras then usual for the said masters and workers to change the privy mark befoi’e used for ano¬ ther, that so the moneys from which they were not yet discharged might be distinguished from those for which they had already received their quietus : which new mark they then continued to stamp upon all their mo¬ neys, until another trial of the pix gave them also their quietus concerning those. The pix is a strong box with three lock?, whose keys are respectively kept by the warden, master, and comptroller of the mint 5 and in which are deposited, sealed up in several pax-cels, certain pieces taken at random out of e\evy journey as it is called j that is, out of every 15 pounds weight of gold, or 60 pounds weight of silver, before tiie same is delivered to the proprietors. And this pix is, from time to time, by the king’s command, opened at Westminster, in the presence of the loi-d chancellor, the lords of the coun¬ cil, the lords commissioners of the treasury, the ju¬ stices of the several benches, and the barons of the exchequer 5 before whom a trial is made, by a jury of goldsmiths impannelled and sworn for that purpose, of the collective weights of certain parcels of the se¬ veral pieces of gold and silver taken at random from those contained in the pix 5 after which those parcels being severally melted, assays are then made of the bullion Mint. M I N [ 278 ] MIR Mint bullion of gold and silver so produced, by the melt- 11 ing certain small quantities of the same against equal Minuet, ■weights taken from the respective trial pieces ot gold and silver that are deposited and kept in the exchequer for that use. This is called the trial of the plv ; the report made by the jury upon that trial is called the Verdict of the pix for that time } and tue indented trial pieces just above mentioned, are certain plates of stand¬ ard gold and standard silver, made with the greatest care, and delivered in upon oath, from time to time as there is occasion, by a jury of the most able and experienced goldsmiths, summoned by virtue of a war¬ rant from the lords of the treasury to the wardens ot the mystery of goldsmiths ot the city of London tor that purpose 5 and which plates being so delivered in, are divided each, at this time, into seven parts by in¬ dentures, one of which parts is kept in his majesty s court of exchequer at Westminster, another by the said company of goldsmiths, and two more by the ot- ficers of his majesty’s mint in the Tower ; the remain¬ ing three being for the use of the mint, &c. in Scot¬ land. The pix has sometimes been tried every year, or even oftener, but sometimes not moi’e than once in several years : and from hence is understood how it comes to pass, that, among the pieces that arc dated as well as marked, three or more different dates are sometimes found upon pieces impressed with the same mark : and again, that different marks are found upon pieces bearing the same date. These marks are first observable upon the coins of King Edward III.-, the words above quoted concerning those marks are from the indentures made with the lord liastings, master and worker to King Edward- IV j and the marks themselves continued to be stamped very conspicuously upon the moneys, till the coinage by the, mill and screw was introduced and settled after the Restoration, in the year 1662 since which time, the moneys being made with far greater regularity and exactness than before, these marks have either been totally laid aside, or such only have been used as are of a more secret nature, and only known to the officers and engravers concerned in the coinage : and indeed the constant practice that has ever since prevailed, of dating all the several pieces, has rendered all such marks of much less consequence than before. Mint. See Mentha, Botany and Materia Medic a Index. MINTURNiE, a town of Campania, between Si- nuessa and Formiae. It was in the marshes in this neigh¬ bourhood that Marius concealed himself in the mud to avoid the pavtizans of Sylla. The people condemned him to death ; but when his voice alone had terrified the executioner, they showed themselves compassionate and favoured his escape. MINUET, a very graceful kind of dance, consisting of a coupee, a high step, and a balance: it begins with a beat, and its motion is triple. The invention of the minuet seems generally to he ascribed to the French, and particularly to the inha¬ bitants of the province of Poictou. The word is said by Menage and Furetiere to be derived from the French menue or menu, “ small or little and in strictness signifies a small space. The melody of this dance consists of two strains, which, as being repeated, are called reprises, each having eight or more bars, but 2 never an odd number. The measure is three crotchets M;nw in a bar, and is thus marked though it is commonly || performed in the time Walther speaks of a minuet i,Mira('i,| in Lully’s opera of Roland, each strain of which con- 1 tains ten bars, the sectional number being 5 5 which renders it very difficult to dance. MINUTE, in Geometry, the 60th part of a degree of a circle. Minute of Time, the 60th part of an hour. Minute, in Architecture, usually denotes the 6othf sometimes the 30th, part of a module. See Archi¬ tecture. Minute is also used for a short memoir, or sketch of a thing taken in writing. Ml NUT] US Felix. See Felix. MINYiE, a name given to the inhabitants of Or- chomenos in Bceotia, from Minyas king of the coun¬ try. Orchomenos the son of Minyas gave his name to the capital of the country ”, and the inhabitants still retained their original appellation, in contradis¬ tinction to the Oidhomenians of Arcadia. A colony of Orchomenians passed into Thessaly and settled in lolchos ; from which, circumstance the people of the place, and particularly the Argonauts, were called Minycc. This name they received, according to the opinion of some, not because a number of Orchomem- ans had uled among them, but because the chiet and noble?;; of them were descended from the daughters of Minyas. Part of the Orchomenians accompanied the sons of Codms when they migrated to Ionia. The descendants of the Argonauts, as well as the Argo¬ nauts themselves, received the name of Minyce. They first inhabited Lemnos, where they had been born from the Lemnian women who had murdered their husbands. They were driven from Lemnos by the Pelasgi, about 1160 before the Christian era, and come to settle in Laconia, from whence they passed into Calliste with a colony of Lacedaemonians. MIQUELF/fS, a name given to the Spaniards who inhabit the Pyrenean mountains on the frontiers of Arragon and Catalonia, and live by robbing. MIQUELON, a small desert island to the south¬ west of Cape May in Newfoundland, ceded to the French by the peace of ^or drying and curing their fish. W. Long. 54. 30. N. Lat. 47. 22. MIRABILIS, Marvel of Peru ; a genus of plants belonging to the pentandria class j and in the natural method ranking with those of which the order is doubtful. See Botany Index. MIRACLE, in its original sense, is a word of the same import with wonder ; but in its usual and more appropriate signification, it denotes “ an eftect contrary to the established constitution and course ot things, or a sensible deviation from the known laws of nature.” That the visible world is governed by stated gene¬ ral rules, or that there is an order of causes and ef¬ fects established in every part of the system of nature which falls under our observation, is a fact which cannot be controverted. If the Supreme Being, as some have supposed, be the only real agent in the universe, we have the evidence ot experience, that, in the particular system to which we belong, he acts by stated rules. If he employs inferior agents to con¬ duct the various motions from which the phenomena result, we have the same evidence that he has subject- MIR [ 279 ] MIR ed those agents to cex'tain fixed laws, commonly called the laivs of nature. On either hypothesis, effects which are produced by the regular operation of these laws, or which are conformable to the established course of events, are properly called natural; and every contradiction to this constitution of the natural system, and the correspondent course of events in it, is called a miracle. If this definition of a miracle be just, no event can be deemed miraculous merely because it is strange, or even to us unaccountable 5 since it may be nothing more than a regular effect of some unknown law of nature. In this country earthquakes are rare 5 and for monstrous births perhaps no particular and satis¬ factory account can be given: yet an earthquake is as regular an effect of the established law's of nature as any of those with which we are most intimately acquainted ; and under circumstances in which there would always be the same kind of production, the monster is nature’s genuine issue. It is therefore ne¬ cessary, before we can pronounce any effect to be a true miracle, that the circumstances under which it is pro¬ duced be known, and that the common course of na¬ ture be in some degree understood j for in all those cases in which we are totally ignorant of nature, it is impossible to determine what is, or what is not, a deviation from its course. Miracles, therefore, are not, as some have represented them, appeals to our ig¬ norance. They suppose some antecedent knowledge of the course of nature, without which no proper judge¬ ment can be formed concerning them $ though with it their reality may be so apparent as to prevent all possi¬ bility of a dispute. Thus, were a physician to cure a blind man of a ca¬ taract, by anointing his eyes with a chemical prepa¬ ration which we had never before seen, and to the na¬ ture and effects of which we are absolute stx-angers, the cure would undoubtedly be wonderful; but we could not pronounce it miraculous, because, for any thing known to us, it might be the natural effect of the operation of the unguent on the eye. But were he to recover his patient merely by commanding him to see, or by anointing his eyes with spittle, we should with the utmost confidence pronounce the cure to be a mi¬ racle j because we know perfectly that neither the hu¬ man voice nor human spittle have, by the established constitution of things, any such power over the diseases of the eye. No one is now ignorant, that pei-sons ap¬ parently dead axe often restored to their families and iriends, by being treated in the manner recommended by the Humane Society. To the vulgar, and some¬ times even to men of science, these effects appear very wonderful •, but as they ai’e known to be produced by physical agency, they can never be considexed as mi¬ raculous deviations from the laws of nature. On the other hand, no one could doubt of his having witnessed a real miracle who had seen a person that had been four days dead come alive out of his grave at the call of an¬ other, or who had even beheld a person exhibiting all the symptoins of death instantly x’esuscitated merely by being desired to live. Thus easy is it, in all cases in which the course of nature is understood, to determine whether any parti¬ cular event be really a miracle ; whilst in cix-cumstances where w'e know nothing of nature and its course, even a true miracle, were it performed, could not be admit¬ ted as such, or carry any conviction to the mind of a philosopher. II mii-acles be effects contrax-y to the established con¬ stitution of things, we are certain that they will never be perfoi'med on trivial occasions. The constitution of things was established by the Creator and Governor of the universe, and is undoubtedly the offspring of infinite wisdom pursuing a plan for the best of purposes. From this plan no deviation can be made but by God himself, or by some powerful being acting with his permission. I he plans devised by wisdom are steady in proportion to their perfection, and the plans of infinite wisdom must be absolutely perfect. From this consideration, some men have ventured to conclude, that no miracle was ever wrought, or can rationally be expected; but nxaturer reflection must soon satisfy us that all such con¬ clusions are hasty. Man is unquestionably the principal creature in this world, and apparently the only one in it who is ca¬ pable of being made acquainted with the relation in which he stands to his Creator. We cannot, therefore, doubt, but that such of the laws of nature as extend not their operation beyond the limits of this earth were established chiefly, if not solely, for the good of man¬ kind j and if, in any particular circumstances, that good can be mox-e effectually promoted by an occasional de¬ viation from those laws, such a deviation may be rea¬ sonably expected. Were man, in the exercise of his mental and corporeal powers, subjected to the laws of physical necessity, the circumstances supposed would in¬ deed never occur, and of course no miracle could be ad¬ mitted. But such is not the nature of man. Mithout repeating what has been said elsewhere (See Metaphysics, Part III. Chap. V.) of necessity and liberty, we shall here take it for granted, that the relation between motives and actions is different from that between cause and effect in physics 5 and that, mankind have such command over themselves, as that by their voluntary conduct, they can make themselves in a great degree either happy or miserable. We know likewise from history, that, by some means or other, al¬ most all mankind were once sunk into the grossest igno- i-ance of the most important truths ; that they knew not the Being by whom they were created and supported ; that they paid divine adoration to stocks, stones, and the vilest reptiles $ and that they were slaves to the most impious, cruel, and degi’ading superstitions. From this depraved state it was surely not unworthy of the common “ Father of all” to rescue his helpless creatures, to enlighten their understandings that they might perceive what is light, and to present to them motives of sufficient force to engage them in the prac¬ tice of it. But the understandings of ignox-ant bar¬ barians cannot be enlightened by arguments j because of the force of such arguments as regard moral science they are not qualified to judge. The philosophers of Athens and Rome inculcated, indeed, many excellent moral precepts, and they sometimes ventured to ex¬ pose the absurdities of the reigning superstition : but their lectures had no influence upon the multitude >. and they had themselves imbibed such erroneous no¬ tions respecting the attributes of the Supreme Being, and the nature of the human soul, and converted those notions into first principles, of which they would not permit MIR [ Miracle, permit an examination, that even among them a tho- rough reformation was not to be expected from the powers of reasoning. It is likewise to oe observed, that there are many truths of the utmost importance to mankind, which unassisted reason could never have dis¬ covered. Amongst these we may confidently reckon the immortality of the soul, the terms upon which God will be reconciled to sinners, and the manner in which that all-perfect Being may be acceptably worshipped; about all of which philosophers were in such uncer¬ tainty, that, according to Plato, “ Whatever is set right, and as it should be, in the present evil state of the world, can be so only by the particular interposition , of God (a). An immediate revelation from Heaven, therefore, was the only method by which infinite wisdom and perfect goodness could reform a bewildered and vicious race. But this revelation, at whatever time we suppose it given, must have been made directly either to some chosen individuals commissioned to instruct others, or to every man and woman for whose benefit it was ulti¬ mately intended. Were every person instructed in the knowledge of his duty by immediate inspiration, and were the motives to practise it brought home to his mind by God himself, human natilre Would be wholly changed: men would not be masters of their own ac¬ tions : they would not be moral agents, nor by con¬ sequence be capable either of reward or of punishment. It remains, therefore, that if God has been graciously pleased to enlighten and reform mankind, without destroying that moral nature which is essential to vir¬ tue, he can have done it only by revealing his truth to certain chosen instruments, who were the immediate instructors of their contemporaries, and through them have been the instructors of succeeding ages. Let us suppose this to have been actually the case, and consider how those inspired teachers could commu¬ nicate to others every truth which had been revealed to themselves. They might easily, if it was part of their duty, deliver a sublime system of natural and moral science, and establish it upon the common basis of ex¬ periment and demonstration; but what foundation could they lay for those truths which unassisted reason cannot discover, and which, when they are revealed, appear to have no necessary relation to any thing pre¬ viously known ? To a bare affirmation that they had been immediately received from God, no rational be¬ ing could be expected to assent. The teachers might be men of known veracity, whose simple assertion would he admitted as sufficient evidence for any fact in conformity with the laws of nature; but as every man has the evidence of his own consciousness and ex¬ perience that revelations from heaven are deviations from these laws, an assertion so apparently extravagant would be rejected as false, unless supported by some better proof than the mere affirmation of the teacher. In this state of things, we can conceive no evidence sufficient to make such doctrines be received as the truths of God, but the power of working miracles committed to him who taught them. This would, 280 ] MIR indeed, he fully adequate to the purpose. For if there MifacH were nothing in the doctrines themselves impious, im-' moral, or contrary to truths already known, the only thing which could render the teacher’s assertion incre¬ dible, would be its implying such an intimate commu¬ nion with God as is contrary to the established course nf things, by which men are left to acquire all their knowledge by the exercise of their own faculties.—»■ Let us now suppose one of those inspired teachers to tell his countrymen, that he did not desire them, on his ipse dixit, to believe that he had any preternatural communion with the Deity, but. that for the truth of his assertion he would give them the evidence of their own senses; and after this declaration let us suppose him immediately to raise a person from the dead itl their presence, merely by calling upon him to come out of his grave. W ould not the only possible objec¬ tion to the man’s veracity be removed by this miracle P and his assertions that he had received such and such doctrines from God be as fully credited, as if it related to the most common occurrence P Undoubtedly it would ; for when so much preternatural power was vi¬ sibly communicated to this person, no one could have reason to question his having received an equal portion of preternatural knowledge, A palpable deviation from the known laws of nature, in one instance, is a sensible proof that such a deviation is possible in another ; and in such a case as this, it is the witness of God to the truth of a man. Miracles, then, under which we include prophecy, are the only direct evidence which can be given of di¬ vine inspiration. When a religion, or any religious truth, is to be revealed from heaven, they appear to be absolutely necessary to enforce its reception among men; and this is the only case in which we can suppose them necessary, or believe for a moment that they ever have been or will be performed. The history of almost every religion abounds, with relations of prodigies and wonders, and of the inter¬ course of men with the gods 5 but we know of no re¬ ligious system, those of the Jews and Christians ex¬ cepted, which appealed to miracles as the sole evidence of its truth and divinity. The pretended miracles mentioned by Pagan historians and poets are not said to have been publicly wrought to enforce the truth of a new religion contrary to the reigning idolatry. Many of them may be clearly shown to have been mere natu¬ ral events; (see Magic). Others of them are re¬ presented as having been performed in secret on the most trivial occasions, and in obscure and fabulous ages long prior to the era of the writers by whom they are re¬ corded. And such of them as at first view appear to be best attested, are evidently tricks contrived for interest¬ ed purposes 5 to flatter power, or to promote the pre¬ vailing superstitions. lor these reasons, as well as on account of the immoral character of the divinities by whom they are said to have been wrought, they are al¬ together unworthy of examination, and carry in the very nature of them the completest proofs of lalsehood and imposture. 1 But (a) Ev xt* nSjMtv, e r/ wfg r*>6r) n xxt yivnlcti o