-U444- '2.oG Kf, ft V 1 % > ,rr7.»Mwr x O K C [ 401 ] O R C Crlnt ftrong, and gives an enemy no reafon to expert better 'i fucceis by attacking one place than another. Ctefar , Onha;.1. (jrew wh0]e army in this form, when he fought a- gaitilt Labienus. The whole army of the Gauls were formed into an orb, under the command of Sabinus and Cotta, when fighting agaxnft the Romans. The orb was generally fonned fix deep. ORBIT, in AJlronomij, the path of a planet or co¬ met, or the curve that it defcribes in its revolution round its central body •, thus, the earth’s orbit is the curve which it defcribes in its annual courfe round the fun, and ufually called the ecliptic. See Astronomy, pajjim. ORCADES, the Orkney IJlands. See Orkney. ORCHARD, a garden-department, configned en¬ tirely to the growth of ftandard fruit-trees, for furnith¬ ing a large fupply of the moll ufefui kinds of fruit. For the particular management of the orchard, fee Garden¬ ing. In the orchard you may have, as ftandards, all forts of apple-trees, moil forts of pears and plums, and all forts of cherries : which four ipecies are the capital or¬ chard fruits 5 each of them comprifing numerous valu¬ able varieties. But to have a complete orchard, you may alio have quinces, medlars, mulberries, fervice- trees, filberts, Spanith truts, berberxies; likewife wal¬ nuts and chefnuts 5 which two latter are particularly ap¬ plicable for the boundaries of orchards, to fereen the other trees from the infults of impetuous winds and cold blafts. Ail the trees ought to be arranged in rows from 20 to 30 feet diftance, as hereafter direfled. But fometimes orchards confift entirely of apple-trees, particularly in the cyder-making counties, where they are cultivated in very great quantities in large fields, and in hedge-rows, for the fruit to make cyder for pub¬ lic fupply. And fometimes whole orchards of very confiderable extent are entirely of cherry-trees. But in this cafe, it is when the fruit is defigned for fale in fome great city, as London, &c. for the fupply of which city, great numbers of large cherry orchards are in fome of the ad¬ jacent counties, but more particularly in Kent, which is famous for very extenfive cherry-orchards j many of which are entirely of that fort called Kentijb cherry, as being generally a great bearer •, others are ftored with all the principal forts of cultivated cherries, from the earlieft to the lateft kinds. A general orchard, however, compofed of all the be¬ fore-mentioned fruit-trees, fiiould confift of a double portion of apple-trees or more, becaufe they are confi- derably the moft ufefui fruit, and may be continued for ufe the year round. The utility of a general orchard, both for private ufe and profit, ftored with the various forts of fruit-trees, muft be very great, as wrell as afford infinite pleafure from the delightful appearance it makes from early fpring till late 1 autumn : In fpring the various trees in bloffom are highly ornamental •, in fummer, the plea¬ fure is heightened by obferving the various fruits advan¬ cing to perfeftion •, and as the feafon advances, the ma¬ ture growth of the different fpecies arriving to perfec¬ tion, in regular fucceflion, from May or June, until the end of Odlober, muft afford exceeding deljght, as well as great profit. Of the Extent, Situation, and Soil for the Orchard.— VOL. XV. Part II. As to the proper extent of ground for an orchard, this Orchard, muft be proportioned, in fome meafure, to the extent v ""l" of land you have to work on, and the quantity of fruit required either for private ufe or for public fupply ; fo that an orchard may be from half an acre to 20 or more- in extent. With refpedl to the fituation and afpeef for an orch¬ ard, we may obferve very thriving orchards both in low and high fituations, and on declivities and plains, in va- rious^aipedts or expofures, provided the natural foil is good : we ihould, however, avoid very lowT damp fitu¬ ations as much as the nature of the place will admit, for in very wet foils no fruit trees will profper, nor the fruit be fine : but a moderately low fituation, free from copious wet, may be more eligible than an elevated ground, as being lefs expofed to tempeftuous winds v though a fituation having a imall declivity is very de- firable, efpecially if its afpedt incline towards the eaft, fouth-eaft, or foutherly, which are rather more eligible than a wellerly afpedf •, but a north afpedt is the worft of all for an orchard, unlefs particularly compenfated by the peculiar temperament or good quality of the foil. Arid as for fail, any common field or pafture that produees good crops of corn, grafs, or kitchen-garden vegetables, is fuitable for an orchard ; if it Ihould prove of a loamy nature, it will be a particular advantage : any foil, however, of a good quality, not too light and dry, or too heavy, ftubborn, or wet, but of a medium nature, of a foft, pliant temperature, not lefs than one fpade deep of good ftaple, will be proper for this pur- pofe. Preparation of the Ground.—The preparation of the ground for the reception of trees, is by trencliing ; or, if for very confiderable orchards, by deep ploughing but trench-digging, one or two fpades, as the foil will admit, is the moft eligible, either wholly, or only for the prefent in the places where the lines of trees are to ftand, a fpace of fix or eight feet wide, all the way in each row, efpecially if it be grafs-ground, and intended to be kept in the fward 5 or if any under-crops are de¬ figned to be railed, the ground may be wholly trench¬ ed at fi) ft : in either cafe trench tire ground in the ufual way to .he depth of the natural foil ; and if in grafs, turn the fward clean to the bottom of each trench, which, when rotted, will prove an excellent manure. In planting orchards, however, on grafs-grounds, fome only dig pits for each tree, capacious enough for the reception of the roots, loofening the bottom well, wfithout the labour of digging any other part of the ground. The ground muft be fenced fecurely againft cattle, &c. either with a good ditch and hedge, or with a pal- ing-tence, as may be moft convenient. Method of planting the Trees.—The beft feafon for planting all the forts of fruit-trees is autumn, foon af¬ ter the fall of the leaf, from about the latter end of October until December ; or indeed it might be per¬ formed any time in open weather from Offober until March. Choofe principally full ftandards, with ftraight clean ftems, fix feet high ; each with a branchy well-formed head, or from two or three to four or five years growth j and let feveral varieties of each particular fpecies be cho- fen, that ripen their fruit at different times, from the earlieft to the lateft, according to the nature of the dif- 3 E ferent O R C [40 ft rent forts, that there may be a proper fupply of every fort regularly during their proper feafbn. Of apples and pears in particular, choofe a much greater quantity of the autumnal and late ripening kinds than of the early forts, but molt of all of apples ; for the fummer-ripen- ing fruit is but of fhort duration, only proper for tem¬ porary fervice 5 but the later ripening kinds keep found fome confiderable time for autumnal ufe 5 and the lateil forts that ripen in Odlober, continue in perfection for various ufes all winter, and feveral forts until the feafon of apples come again. Having made choice of the proper forts, and marked them, let them be taken up with the utmoft care, fo as to preferve all their roots as entire as poffible ; and when taken up, prune off any broken or bruifed parts of the roots, and juft tip the ends of the principal roots, in ge¬ neral, with the knife on the under fide with a kind of Hope outwTard. If the trees have been already headed, or fo trained as to have branched out into regular (hoots to form each a proper head, they muft be planted with the faid heads entire, only retrenching or fhortening any irregular or ill-placed (hoot that takes an aukwrard direCfion, or grows acrofs its neighbours, or fuch as may run confi- derably longer than all the reft, &c. The arrangement of the trees in the orchard muft be in row's, each kind feparate, at diftances according to the nature of the growth of the different forts ; but for the larger growing kinds, fueh as apples, pears, plums, cherries, &c. they ftiould (land from 25 to 30 or 40 feet every way afunder, though 25 or 30 feet at moft is a reafonable diftance for all thefe kinds. Each fpecies and its varieties (hould generally be in rowrs by themfelves, the better to fuit their refpeclive modes of growth: though for variety there may be fome rows of apples and pears arranged alternately, as alfo of plums and cherries 5 and towards the boundaries there may be ranges of lefler growth, as quinces, medlars, fil¬ berts, &c. and the outer row of all may be walnut- trees, and fome chefnuts, fet pretty clofe to defend the other trees from violent winds. According to the above diftances, proceed to ftake out the ground for making the holes for the reception of the trees, which if made to range every wray, will have a very agreeable effecl, and admit the currency of air, and the fun’s influence more effectually. But in planting very extenfive orchards, fome divide the ground into large fquares or quarters, of different dimenfions, with intervals of 50 feet wide between 5 ferving both as walks, and for admitting a greater cur¬ rency of air •, in different quarters planting different forts of fruit, as applas in one, pears in another, plums and cherries in others, &c. and thus it may be repeated to as many quarters for each fpecies and its va¬ rieties as may be convenient. As to the mode of planting the trees : A wide hole muft be dug for each tree, capacious enough to receive all the roots freely every way without touching the (ides. When the holes are all ready, proceed to plant¬ ing, one tree in each hole, a perfon holding the ftem eredft, w'hilft another trims in the earth, previouljy breaking it fmall, and calling It in equally aril about the roots, frequently (baking the tree to caufe the mould to fettle in clofe about all the fmaller roots and fibres, and fo as to raife the tree gradually up, that the crown of 2 ]' O II C the roots may he but two or three inches below the ge- Orchard. neral furface } and when the hole is filled up, tread it * gently, (hit round the outfide, then near the ftem of the tree, forming the furface a little hollow", and then, if on the top of all be laid fome inverted turf to the wfidth of the hole, forming it with a fort of circular bank, three or four inches high, it will fupport the tree, and guard the roots from drying winds and the fummer’s drought: obferving that each tree (land per- fedlly upright, and that they range exaftly in their pro¬ per row's. Method of improving the Fruit.—The following me¬ thod is faid to have been fuccefsfully employed, by a German clergyman, in promoting the growth of young trees, and increafing the (ize and flavour of the fruit in orchards. Having planted feveral young plum trees in an orchard, he covered the ground, for fome years, around the trunks, as far as the roots extended, with flax-lhows, or the refufe of flax when it is fcutched or heckled ; by w'hich means thefe trees, though in a grafs- field, increafed in a wonderful manner, and far excelled others planted in cultivated ground. As far as the (hows reached, the grafs and weeds were choaked j and the foil under them was fo tender and foft, that no bet¬ ter mould could have been wiftied for by a florid. When he obferved this, he covered the ground w'ith the fame fubftance, as far as the roots extended, around an old plum-tree, which appeared to be in a languiftiing (late, and which ftood in a grafs-field. The confequen- ces w'ere, that it acquired a ftrong new bark, produced larger and better-tafted fruit, and that thofe young (lioots, w'hich before grew up around the ftem, and which it was every year neceftary to deftroy, were pre¬ vented from fprouting forth, as the covering of flax- (hows impeded the free accefs of air at the bottom of the trunk. In the year 1793* he tranfplanted, from feed-beds, into the nurfery, feveral fruit-trees 5 the ground around fome of which he covered, as above, w'ith flax-(hows. Notw'ithllanding the great heat of the fummer, none of thofe trees where the earth was covered with (hows died or decayed, becaufe the (hows prevented the earth un¬ der them from being dried by the fun. Of thofe trees, around which the ground was not covered as before mentioned, the fourth part mifearried 5 and thofe that continued alive were far weaker than the foimer. The leaves which fall from trees in autumn may alft be employed for covering the ground in like manner; but ftones, or logs of wmed muft be laid on them, to prevent their being difperfed by the wind. In grafs- land, a fmall trench may be made around the roots of the tree, w'hen planted, in order to receive the leave?. If flax (hows are ufed, this is not neceffary •, they lie on the furface of the ground fo fail as to refill the force of the moft violent dorm. The leaves w'hich our author found moft eftedlual in promoting the growlh and ferti¬ lity of fruit trees, are thofe of the walnut-tree. Whe¬ ther it is, that, on account of their containing a greater abundance of ialine particles, they communicate manure to the ground, which thereby becomes tender under them ; or that they attract nitrous particles from the at- mofphere", or that, by both thefe means, they tend to nourifti the tree both above and below'. Thofe wTho are defirous of railing tender exotic trees from the feed, in order to accuftom them to our climate, may. O Pv D [ 403 ] O Pi 13 Crdieftra may, wKen they tranfplant them, employ flax-fliows 1! with great advantage. This covering will prevent the Qrd£a!' , froft from making its way to the roots •, and rats and n'”v mice, on account of the fliarp prickly points of the tlax-fliows, will not be able to fhelter themfelves under them. ORCHESTRA, in the Grecian theatres, was that part of the profcenium or Rage where the chorus ufed to dance. In the middle of it wras placed the Aoyuov or pulpit. The orcheftra was femicircular, and furround- ed with feats. In the Roman theatres it made no part of the fcena, but anfwered pretty nearly to the pit in our playhoufes, being taken up with feats for fenators, magiftrates, veftals, and other perfons of diftinftion. The aflors never went down into it. See Theatre. ORCHIA lex, inilituted by Orchius the tribune in the year of Rome 566. Its intention was to limit the number of guefts that were to be admitted at ac enter¬ tainment p and it alfo enforced, that during fupper, which was the chief meal among the Romans, the doors of every houfe (hould be left open. ORCHIS, fool-stones •, a genus of plants belong¬ ing to the gynandria clafs, and in the natural method giving name to the feventh order, Orchidece. See Bo¬ tany Index. ORCUS, god of the infernal regions, the fame with Pluto, fo called from the Greek word e^oj, fignifying a “ tomb or fepulchre,” or from o^y.a?, “ an oath by the river Styx.” The ancients gave this name to all the divinities of the infernal regions, even to Cerberus. There was a river of the fame name in Theffaly, which took its fife from the marlhes of the Styx, and the wa¬ ters of which were fo thick that they iloated like oil upon the furface of the fiver Peneus, into which they difcharged themfelves. This river probably fuggefted to the poets the idea of the infernal abodes, which they Renominated Orcus. This deity has been confounded with Charon, he had a temple at Rome. ORDEAL, an ancient form of trial. See Trial. —It was an appeal to the immediate interpolition of di¬ vine power, and was particularly diftinguilhed by the appellation of judicium Dei; and fometimes vulgaris purgation to diflinguifh it from the canonical purgation, which was by the oath of the party. There were two forts of it more common than the reft, at lead in Eu¬ rope ; fire-ordeal, and water-ordeal. The former was confined to perfons of higher rank, the latter to the common people. Both thefe might be performed by deputy; but the principal was to anfwer for the fuccefs - Ordeal, of the trial ; the deputy only venturing fome corporal pain, for hire or perhaps for friendfhip. That the purgation by ordeal, of fome kind or other, is very ancient, admits not of a doubt ; and that it was very univerfal in the times of fuperftitious barbarity, i equally certain. It feems even to have been known to the ancient Greeks} for in the Antigone of Sophocles, a perfon fufpedted by Creon of a mifdemeanour, de¬ clares himfelf ready “ to handle hot iron and to walk over fire” in order to manifeft his innocence 5 which the fcholiaft tells us was then a veiy ulual purgation. And Grotius gives us many inftances of water-ordeal in Bi- thynia, Sardinia, and other places. It feems, however, to be carried to a greater height among the Hindoos, than ever it has been in any nation or among any peo¬ ple, however rude or barbarous •, for in a paper of the Afiatic Refearches communicated by Warren Haftings, Efq. we find that the trial by ordeal among them is condufted in nine different ways : firft, by the balance ; fecondly, by fire } thirdly, by water 5 fourthly, by poi- fon 5 fifthly, by the Coftra, or water in which an idol has been wafhed; fixthly, by rice ; feventhly, by boiling oil -p eighthly, by red-hot iron ; ninthly, by images. I. Ordeal by the balance is thus performed. The beam having been previoufly adjufted, the cord fixed, and both fcales made perfectly even, the perfon accufed and a Pandit faft a whole day j then, after the accufed has been bathed in facred water, the homa, or oblation, prefented to fire, and the deities worftiipped, he is care¬ fully weighed 5 and when he is taken out of the fcale, the Pandits proftrate themfelves before it, pronounce a certain mentra or incantation, agreeably to the Saftras, and, having written the fubftance of the accufation on a piece of paper, bind it on his head. Six minutes after, they place him again in the fcale; and, if he weigh more than before, he is held guilty ; if lefs, innocent $ if exadtly the fame, he muft be weighed a third time j when, as it is written in the Mitacfhera, there will cer¬ tainly be a difference in his weight. Should the ba¬ lance, though wrell fixed, break down, this would be confidered as a proof of his guilt. II. F or the fire-ordeal, • an excavation, nine hands long, two fpans broad, and one fpan deep, is made in the ground, and filled with a fire of pippal wTood : into this the perfon accufed muft walk bare-footed *, and, if his foot be unhurt, they hold him blamelefs } if burned, guilty (a). 3 E 2 III. (a) In Europe fire-ordeal was performed either by taking up in the hand, unhurt, a piece of red-hot iron, of one, two, or three pounds weight •, or elfe by walking, barefoot, and blindfold, over nine red-hot plough-fliares, laid lengthwife at unequal diftances ■, and if the party efcaped being hurt, he was adjudged innocent, but^if it hap¬ pened otherwife, as without collufion it ufually did, he was then condemned as guilty. However, by this latter method Queen Emma, the mother of Edward the Confeffor, is mentioned to have cleared her charafter, when fu- fpefted of familiarity with Alwyn bifhop of Winchefter. The firft account we have of Chriftians appealing to the fire-ordeal, as a proof of their innocence, is that of Simplicius, bifhop of Autun, who lived in the fourth century. 'Phis prelate, as the ftory is related, before his promotion to the epifcopal order, had married a wife, who loved him tenderly, and who, unwilling to quit him after his advancement, continued to fleep in the fame chamber with him. The fanclity of Simplicius fuffered, at leaf! in the voice of fame, by the conftaney of his wife’s affedlion 5 and it was rumoured about, that the holy man, though a billiop, perfifted, in oppofition to the ecclefiaftical canons, to tafte the fweets of matrimony : upon which his wife, in the prefence of a great concourfe of people, took up a confiderable quantity of burning coals, which fine held in her clothes, and applied to her breafts, without the leaft hurt to her perfon or her garments as the legend fays and her example being followed by her hufband with the like O K D [ 404 ] O R D HI. Water-ordeal is performed by canifmg the perfon accufed to ftand in a fufficient depth of water, either flowing or flagnant, to reach his navel j but care fhould be taken that no ravenous animal be in it, and that it be not moved by much air ; a brahman is then directed to go into the water, holding a ftaff in his hand } and a foldier fhoots three arrows on dry ground from a bow of cane ; a man is next defpatched to bring the arrow which has been fhot fartheft 5 and, after he lias taken it up, another is ordered to run from the edge of the wa¬ ter } at which inftant the perfon accufed is told to grafp the foot or the ftaff of the brahman, who Hands near him in the water, and immediately to dive into it. He muft remain under water, till the tw7o men w'ho wrent to fetch the arrows are returned •, for, if he raile his head or body above the furface, before the arrows are brought back, his guilt is confidered as fully proved. In the villages near Benares, it is the practice for the perlon who is to be tried by this kind of ordeal, to Hand in water up to. his navel, and then, holding the foot of a brahman, to dive under it as long as a man can walk paces very gently $ if, before the man has vTaiked thus far, the accufed rife above the water, he is con¬ demned ; if not, acquitted (b). IV. There are two forts of trial by poifon •, firfl, the pandits having performed their homa, and the perlon accufed his ablution, two rettis and a half, or feven bar¬ ley-corns of vifhanaga, a poifonous root, or of fauc'hya, that is, white arfenic, are mixed in eight mafias, or 64 rettis, of clarified butter, which the accufed mud eat from the hand of a brahman : if the poifon produce no vifible effect, he is abfolved *, otherwife condemned. Secondly, the hooded fnake, called naga, is thrown in¬ to a' deep earthen pot, into which is dropped a ring, a feal, or a coin •, this the perfon acculcd is ordered to take out with his hand 5 and, if the ferpent bite him, he is pronounced guilty •, it mot, innocent. V. Trial by the coHia is as follows : the accufed is made to drink three daughts of the water, in which the images of the fun, of Devi, and other deities, have been walhed for that purpofe •, and if,- within 14 days, he has any ficknefs or indifpofftion, his crime is confider- ed as proved. VI. When feveral perfons are fufpe&ed of theft, fome dry rice is weighed with the facred Hone called fa/gram, or certain Jlocas are read over it; after which the fufpecled perfons are feverally ordered to chew a quantity of it: as foon as they have chewed it, they are to throw it on fome leaves of pippal, or, if none be at hand, on fome b'/iurja patra, or bark of a tree, from Nepal or Cafhmir. The man, from whofe mouth the rice comes dry or flamed with blood, is holden guilty 5 the reff is acquitted. VII. The ordeal by hot oil is very Ample : when it is heated fufficiently, the accufed thruffs his hand into it ; and, if he be not burned, is held innocent (c). VIII. like fuccefs, the filly multitude admired the miracle, and proclaimed the innocence of the loving pair. A fimilar trick was played by St Brice, in the fifth century. Alofi. Keel. Hi/l. vol. ii. ('b) A very peculiar fpecies of water-ordeal is laid to prevail among the Indians on the coafl of Tvlalabar. A per- ion accufed of an enormous crime is obliged to fwim over a large riven abounding with crocodiles 5 and if heefcapes unhurt, he is efleemed innocent. At Siam, befides the ufual methods of fire and water ordeal, both'parties are fometimes expofed to the fury of a tiger let loofe for that purpofe } and if the beall fpares either, that perfon is accounted innocent } if neither, both are held to be guilty} but if he fpares both, the trial is incomplete, and they proceed to a more certain cri¬ terion. In Europe water-ordeal was performed, either by plunging the bare arm up to the elbow in boiling-water, and efcaping unhurt thereby, or by cafling the perfon fufpedled into a river or pond of cold water 5 and it he floated therein without any aftion of fwimming, it was deemed an evidence of his guilt , but if he funk, he was ac¬ quitted. It is eafy to trace out the traditional relics of this water-ordeal, in the ignorant barbarity Hill pradtiied in many countries to difeover witches, by cafling them into a pool of water, and drowning them to prove their innocence. And in the eaftern empire the fire-ordeal was ufed for the fame purpofe by the emperor Ihecdore Lafcaris •, w7ho, attributing his ficknefs to magic, caufed all thofe whom he fulpefted to handle the hot iron : thus joining (as has been wTcll remarked) to the moft dubious crime in the world, the moft dubious proof of in¬ nocence. (c) This fpecies of trial by ordeal is thus performed : The ground appointed for the trial is Cleared and rubbed wuth cow-dung, and the next day at funrife the Pamlit worfhips Ganefa or the Hindoo Janus, presents his oblations, and pays adoration to other deities, conformably to the Sa/ira : then having read the incantation pieferibed, lie places a round pan qf gold, filver, copper, iron, or clay, with a diameter of fixteen fingers, and four fingers deep j and throve into it one fir, or eighty ficca wTeight, of clarified butter or oil offifamum. After this a ring of gold, or filver, or iron, is cleaned and rvafhed with water, and caft into the oil} which they proceed to heat, and when it is very hot put into it a frefh leaf ofpippala, or of bi/wa : when the leaf is burned, the oil is known to be fufh- ciently hot. Then, having pronounced a mentra over the oil, they order the party accufed to take the ring out of the pan } and if he take it out wnthout being burned, or -without a blifter on his hand, his innocence, is conndered as proved } if not, his guilt. It is reported that this cuftom, with fome flight variations, ftill prevails among the Indians on the coafl: of Malabar. The procefs there is faid to begin after the accufed perfon has been thoroughly wafhed in the prefence of the prince of the country, the priefts, &c. :—the pot is filled with boiling lead j and the accufed muft take the ring out three times fucceflively. On the Malabar coaft, this ordeal feems only to be ufed when the perfon is accufed of a capital crime } for after the procefs the arm is bound ivith cloth and fealed } and after feveral days, being brought out publicly, and the arm infpedfed, if it is found burnt he is inftantly nut to death } if not, his accufer undergoes the fame trial, and being burnt, forfeits his life. O R D [ 405 ] O R D Ordeal. VIII. In the fame manner they maice an iron hall, v - or j_]ie }iea(l of a lance, red hot, and place it in the hands of the perfon accuied who, if it burn him not, is judged guiltlefs. IX. To perform the ordeal by dharmdch, which is the name of the foca appropriated to this mode of trial, either an image, named Dhartna, or the genius of jui- tice, is made of filver, and another, called Adharma, of clay or iron, both of which are thrown into a large earthen jar ; and the accufed having thruft his hand in¬ to it, is acquitted if he bring out the filver image, but condemned if he draw forth the iron ; or, the figure of a deity is painted on white cloth, and another on black; the frft of which they name dkarma, and the fecond adharma : thel’e are federally rolled up in cow-dung, and thrown into a large jar without having ever been fhown to the accufed ; who muft put his hand into the jar, and is acquitted or convifted as he draws out the figure on white or on black cloth. Though we have proceeded thus far, we have not ex- haufted Mr Haftings’s communication. He goes on to lhow’(to greater extent than our limits permit us to fol¬ low him) the manner in which each ordeal above men¬ tioned was executed, giving examples, and unfolding other particulars of fome importance in developing the nature of thefe barbarous cuftoms. Tor thefe particu¬ lars, however, we muft refer to the book itfelf. But as this fubjecl unqueftionably occupies an important de¬ partment in the hiftory of human fuperftition, we ftiall give the Indian law of ordeal from the fame paper \ when we fhall introduce fome further particulars con¬ cerning this extraordinary cuftom, which are not to be found in the above account, but which deferve tp be noticed. “ 1. The balance, fire, wrater, poifon, the idol—■-thefe are the ordeals ufed here below for the proof of inno¬ cence, wdien the accufations are heavy, and vftien the accufer offers to hazard a mulct, (if he ftiould fail) : 2. Or one party may be tried, if he pleafe, by or¬ deal, and the other muft then rifk an amercement} but the trial may take place even without any wager, if the crime committed be injurious to the prince. 3. The fovereign having fummoned the accufed while his clothes are yet moift from bathing, at funrife, before he has broken his faft, lhall caufe all trials by ordeal to be conducted in the prefence of Brahmans. 4. The balance is for women, children, old men, the blind, the lame, Brahmans, and the fick ; for the dra, fire or w^ater, or feven barley-corns of poifon. 5. Unlefs the lofs of the accufer amount to a thou- fand pieces of filver, the accufed muft not be tried by , the red-hot ball, nor by poifon, nor by the fcales; but if the offence be againft the king, or if the crime be heinous, he. muft acquit himfelf by one of thofe trials in all cafes. 6. He who has recourfe to the balance muft be at¬ tended by perfons experienced in weighing, and go down into one fcale, with an equal weight placed on the other, and a groove (wuth water in it) marked on the beam. 7. ‘ Thou, O balance, art the manfion of truth; Ordeal, thou waft anciently contrived by deities T declare the ' ■"-v—“ truth, therefore, O giver of fuccefs, and clear me from all fufpicion. 8. ‘ If I am guilty, O venerably as my own mother, then fink me down, but if hnocent raife me aloft.’ Thus ftiall he addrefs the balance. 9. If he fink he is convitled, or if the fcales be bro¬ ken : but if the firing be not brokdn, and he rife, aloft, he muft be acquitted. ig. On the trial by fire, let both hands of the accu¬ fed be rubbed with rice in the hulk, and well examined; then let feven leaves of the A/watAha (the religious fig-tree) be placed on them, and bound with ieven threads. ix. ‘ Thou, O fire, pervadeft all beings: O caufe of purity, who giveft evidence of virtue and of fin, de¬ clare the truth in this my hand.’ 12. When he has pronounced this, the prieft lhall place in both his hands an iron ball, red-hot, and weighing fifty pa las (d). 13. Having taken it, he lhall ftep gradually into fe¬ ven circles, each with, a diameter of fixteen fingers, and feparated from the next by the fame fpacer 14. If, having call away the hot ball, he lhall again have his hands rubbed with rice in the hulk, and lhalL Ihow them unburned, he will prove his innocence. Should the iron fall during the trial, or Ihould a doubt arife (on the regularity of the proceedings), he muft be tried again. 15. ‘ Preferve me, O Varuna, by declaring the truth.’ Thus having invoked the god of waters, the accufed lhall plunge his head into the river or pool,, and hold both thighs of a man, who ftiall Hand in it up to his navel: 16. A fwift runner lhall then haften to fetch an ar¬ row ftiot at the moment of his plunging ; and if, while the runner is gone, the prieft lhall lee the head of the accuied under water, he muft be difcharged as inno¬ cent. 17. ‘ Thou, O poifon, art the child of Brahma, ftedfaft in juftice and in truth : clear me then from this heavy charge, and if I have fpoken truly, become neiftar to me.’ 18. Saying this, he lhall fwallow the poifon Sdrnga, from the tree which grows on the mountain Hima¬ laya ; and if he digefts it without any inflammation, the prince lhall pronounce him guiltlefs. 19. Or the prieft ftiall perform rites to the image of fome tremendous deity ; and, having bathed the idol, ftiall make the accuied to drink three handfuls of the water that has dropped from it. 20. If in fourteen days after he fuffers no dreadful calamity from the a O R D Order, monk (a). If his receipt be genuine, it feenis to have con- ““ fified rather in covering the hands with a kind of pafte than in hardening them. The lap of the altluva (marfh- mallow), the flimy feeds of the flea-bane, which is ftill ufed for ftiffening by the hat-makers and filk-weavers, together with the white of an egg, were employed to make the pafte adhere. And by thefe means the hands • were as fafe as if they had been fecured by gloves. “ The ufe of this juggling trick is very old, and may be traced back Lo a Pagan origin. In the Antigone of Sophocles, the guards placed over the body of Polynices, tvhich had been buried contrary to the orders of Creon, offered, in order to prove their innocence, to fubmit to any trial. We will,•(hid they, take up red-hot iron in * Vol. iii. our hands, or walk through fire ORDER, in Architetture, is a fyftem of the feveral members, ornaments, and proportions of columns and pilafters •, or a regular arrangement of the projecting parts of a building, efpecially the column, fo as to form one beautiful whole. See Architecture. Order is alfo ufed for a divifion or clafs of any thing : thus the tribe of animals called birds is fubdivid- ed into fix orders. See Ornithology. Order, in Rhetoric, is the placing of each word and member of a fentence in fuch a manner, aswi!1 moll contribute to the force, beauty, or evidence of the whole ; according to the genius and cuftom of clifi’erent languages. With regard to order, we may obferve in general, that, in Eriglifh, the nearer we keep to the na¬ tural or grammatical order, it is generally the befl ; but in Latin, we are to follow the ufe of the belt writers; joint regard being always had to the judgement of the ear, and the perfpicuity of the fenfe, in both lan¬ guages. Order is alfo ufed for a clafs or divifion of the mem¬ bers of the body of a ftate 5 with regard to affemblies, precedency, &c. In this fenfe, order is a kind of dignity, which, under the fame name, is common to feveral perfons •, and which, of itfelf, does not give them any particular public au¬ thority, but only rank, and a capacity of arriving at honours and employments. To abridge this definition, order 'may be faid to be 3 dignity attended with an aptitude for public employ. By which it is diftinguhhed from an office, which is the exercife of a public truft. In this fenfe, nobility is an order, &c. The cleri¬ cal e is alfo an order, &c. OitDER is alfo the title of certain ancient books, con¬ taining the divine office, with the order and manner of its performance. Roman order is that wherein are laid down the ce¬ remonies which obtain in the Romiffi church. See Ri¬ tual. Order, hi Botany, is a name given to a fubdivifion pf plants in the Linnaean fyftem. See Botany. 6 it d ORDERS, by way ofeminency, or Ho/y ORBERS, Order, note a charafter peculiar to ecclefiaftics, whereby they "—■—y—“ are let apart for the miniftry. See Ordination. This the Romanifts make their fixth facrament. In no reformed church are there more than three or¬ ders } viz. biihops, priefts, and deacons. In the Romiffi church there are feven, exclufive of the epifoopate, all which the council of Trent enjoins to be received, and believed, on pain of anathema. They are diftinguilhed into petty, or fecular orders} and major, or facred orders. Orders, the petty, or minor, are four ; viz. thofe »f doorkeeper, exorcift, reader, and acolyth. Thofe in petty orders may marry without any difpen- fation : in effeif, the petty orders are looked on as little other than formalities, and as degrees neceilary to arrive at the higher orders. Yet the council of Trent is very ferious about them 5 enfoins that none be admitted into them without underftanding Latin ; and recommends it to the biihops, to obferve the intervals of conferring them, that the perfons may have a futficient time to exercile the funtfion of each order ; but it leave! the biihops a power of dilpenfing with thofe rules; fo that the four orders are ulually conferred the fame day, and only make • the firft part of the ceremony of ordination. The Greeks difavow thefe petty orders, and pafs im¬ mediately to the fubdeaconate ; and the reformed to the deaconate. Their firft rife Fleury dates in the time of the emper¬ or Juftinian. There is no call nor benefice required for the four petty orders and even a baftard may enjoy them without any difpenfation 5 nor does a fecond mar¬ riage difqualify. ORDERS, facred, or major, we have already obferved, are three : viz. thofe of deacon, prieft, and bifliop. The council of Trent retrieving the ancient difei- pline, forbids any perfon being admitted to the major orders,janlcfs he be in peaceable poffeffion of a benefice fafficient for a decent fubfiftence; allowing no ordi¬ nations on patrimonies or penfions, except where the bilhon judges it for the fervice of the church. A perfon is faid to be promoted to orders per fal- tum, when he has not before paffed the inferior or¬ ders. The council of Conftantinople forbids any bi¬ fliop being ordained without paffing all the degrees, yet churcb-hiftory furnifties us with inftances of bi- fliops confecrated, without having paffed the order of priefthood •, and Panormus ftill thinks fuch an ordination valid. Military ORDERS, are companies of knights, infti- tuted by kings and princes, either for defence of the faith, or to confer marks of honour, and make diftinc- tions among their I'ubjedls. Re/iqious Orders, are congregations or focieties of monaftics, living under the fame luperior, in the fame manner, and wearing the fame habit. Religious or¬ ders [ 4°& ] (a) In his work De Mirabilibus Mundi, at the end of his book De Secretis Mulierutn, Amftelod. 1702, 12mo, p. 100. Experimentum mirabile quod facit hominem ire in ignem fine Ifefione, vel portare ignem vel ferrum ignitum fine laefione in manu. Recipe fuccum bifmalvse, et albumen ovi, et femen pfylli et ealeem, et pulveriza, et confice cum illo albumine ovi fuccum raphani; commifce ; ex hac confe£fione illineas corpus tuum vel manum, et dimitte ficcari, et poftea iterum illineas, et poll hoc poteris audaifer fuftinere ignem fine nocumento. 3 Order I! Ordinance. O R D t 4°9 Aers may be reduced to five kinds j viz. monks, canons, knights, mendicants, and regular clerks. See Monk, Canon, &c. Father Mabillon proves, that till the ninth century, almoft all the monafteries in Europe followed the rule of St Benedict •, and that the diftin&ion of orders did not commence till upon the reunion of feveral mona- lleries into one congregation : that St Odo, abbot of Cluny, firft began this reunion, bringing feveral houfes under the dependence of Cluny: that, a little after¬ wards, in the nth century, the Camaldulians arofe ; then, by degrees, the congregation of Vallombrofa j the Ciftercians, Carthufians, Auguftines ; and at laft, in the 13 th century, the Mendicants. He adds, that Lupus Servatus, abbot of Ferrieres, in the ninth cen- tQry, is the firll that feems to diftinguifh the order of St Benedift from the reft, and to fpeak of it as a parti¬ cular order. White Order denotes the order of regular canons of St Auguftine. See Augustines. B/ack Order denoted the order of Benedictines. Thefe names were firft given thefe two orders from the colour of their habit ; but are difufed nnce the inftitution of feveral other orders, who wear the fame colours. Gray ORDER wTas the ancient name of the Cisterci¬ ans •, but fince the change of the habit, the name fuits them no more. Orders, religious military, are thofe inftituted in de¬ fence of the faith, and privileged to fay mafs 5 and who are prohibited marriage, &c. Of this kind are the knights of Malta, or of St John ©f Jerufalem. Such alfo were the knights Templars, the knights of Calatrava, knights of St Lazarus, Teu¬ tonic knights, &c. See Malta, Templar, &c. Father Putignani accounts thofe military orders where marriage is not allowed, real religious orders. Pape- broch fays, it is in vain to fearch for military orders be¬ fore the I 2th century. Orders, in a military fenfe, all that is lawfully commanded by fuperior officers. Orders are given out every day, whether in camp, garrifcug or on a march, by the commanding officer j which orders are afterwards given to every officer in writing by their refpeclive fer- jeants. ORDINAL, a book containing the order or manner of performing divine fervice. See Ritual. ORDINAL Numbers, thofe which exprefs order, as ift, 2d, 3d, &c. ORDINANCE or Ordonnance, a law, ftatute, or command of a fovereign or fuperior ; thus the afts of parliament are fometimes termed ordinances of parlia¬ ment, as in the parliament-rolls. Though in fome cafes we find a difference made between the two ; ordinances being only temporary things, by way of prohibition; and capable of being altered by the commons alone : whereas an aft is a perpetual law, and cannot be altered but by king, lords, and commons. Coke afferts, that an ordinance of parliament dif¬ fers from an aft, as the latter can only be made by the king, and the threefold confent of the eftates 5 whereas the former may be made by one or two of them. ORDINANCE of the For eft, is a ftatute made in the 34th year of Henry I. relating to fore ft-matters. ~ VoL. XV. Part II. ] ORB In the French jurifprudence, ordinances are fuch Ordinary laws as are eftabliffied by the king’s authority alone. 0rdllfatioiv A 11 1 1 1 H 4rsa.r> tsi+1 a £)t SI awmi* All ordonnances begin with, a tons prefens, et a vemr faint. ORDINARY, in general, fignifies common, ufual •, thus, an ambaffador, or envoy in ordinary, is one fent to refide ftatedly, and for a number of years, in the court of fome foreign prince or ftate, in order to keep up a good underftanding, and watch over the intereft of his own nation.—This term is alfo applied to feve¬ ral officers in the king’s houfhold, who attend on com¬ mon occafions. Thus we fay, phyfician in ordinary, &c. Ordinary, in naval language, denotes the eftablifh- ment of the perfons employed by government to take charge of the {hips of war, which are laid up in the feveral harbours adjacent to the royal dock-yards. Thefe are principally compofed of the warrant-officers of the faid ffiips, as the gunner, boatfwain, carpenter, deputy-purfer, and cook, and three fervants. ft here is befides a crew of labourers inrolled in the lift of the or¬ dinary, who pafs from ftiip to ihip occafionally, to pump, moor, remove, or clean them, whenever it is necei- fary. The term ordinary is alfo applied fometimes to the ffiips themfelves ; it is likewife ufed to diftinguifh the inferior failors from the moft expert and diligent, ft he latter, are rated able on the navy books, and have higher pay than thofe who are rated ordinary. Ordinary, in common or canon law, means one who has ordinary or immediate jurifdiftion in matters ecclefiaftical, in any place. In this fenfe archdeacons are ordinaries, but the appellation is moft frequently applied to the biffiop of the diocefe, who has of courfe the ordinary ecclefiaflical jurifdiftion, and the colla¬ tion to benefices within fuch diocefe. ft'here are fome chapels, chapters, abbeys, &c. exempted from the ju¬ rifdiftion of the ordinary. The archbiffiop is ordinary of the whole province, to vifit, and receive appeals from the inferior judicatures, ft’he Romifti writers on canon law call the pope by way of eminence ordinary of ordinaries, fince by the Lateran council he has ufurp- ed the right of collating, by probation, to all benefices j in exclufion of the common collators. Ordinary of Affixes and Seffions, was a deputy of the biffiop of the diocefe, anciently appointed to give malefaftors their neck-verfes, and judge whether they read or not : alfo to perform divine lervice for them, and affift in preparing them for death. So the Or DINAR Y of Newgate, is one wdio is attendant in ordinary upon the condemned malefaftors in that prifon to prepare them for death ; and he records the behavi¬ our of fuch perfons. Ordinary, or Honourable Ordinary, in Heraldry, a denomination given to certain charges properly be¬ longing to that art. See Heraldry, Chap. III. feft. i. ORDINATES, in Geometry and Conics, are, lines drawm from any point of the circumference of an ellipfis, or other conic feftion, perpendicularly acrofs the axis, to the other fide. See CONIC-Sediions. ORDINATION, the aft of conferring holy orders, or of initiating a perfon into the priefthood by prayer and the laying on of hands. Ordination has always been efteemed a principal pre¬ rogative of Liflicps, and they ftill retain the funftion 3 F as o II D [ 410 ] O R D O 'dination, as a mark of fpiritual fovereignty in their diocefe. , ‘fl^lnce-| Without ordination, no perfon can receive any benefice, parfonage, vicarage, &c. A perfon muft be 23 years of age, or near it, before lie can be ordained deacon, or have any fliare in the. mini (try 5 and full 24 before he can be ordained pried, and by that means be permitted to adminilter the holy communion. A bilhop, on the ordination of clergymen, is to examine them in the pre- fence of the miniiters, who, in the ordination of priefts, but not ot deacons, aflift him at the impofition of hands; but this is only done as a mark of affent, not becaufc it is thought neceffary. In cafe any crime, as drunken- nefs, perjury, forgery, &c. be alleged againft any one that is to be ordained, either pried or deacon, the bilhop ought to defid from ordaining him. The perfon to be ordained is to bring a tedimenia! of his life and doctrine to the bidiop, and to give account of his faith in Latin ; and both prieds and deacons are obliged to fubferibe the 39 articles., I he ordination of bifhops is more properly and more commonly called confecratian. In the ancient difeipline there was no fuch thing as a vague and abfolute ordination } but every one was to have a church, whereof he was to be ordained clerk, or pried. In the twelfth century they grew more remifs, and ordained without any title or benefice. The Council of Trent redored the ancient difeipline, and appointed that none diould be ordained but thofe who were provided of a benifice fufficient to fubfid them. Which practice dill obtains in England. The council of Rome, in 944, orders, that no ordi¬ nations (hall be held except on the fird, fourth, fevenih, and ten months. In England, by can. 31. ordination days are the four Sundays immediately following the Ember-weeks ; being the fecond Sunday in Lent, Tri- nity-Sunday, and the Sundays following the fird Wed- nefday after September the 14th, and December the 13th. Thefe are the dated times 5 but ordinations may take place at any other time, according to the diferetion ot the bidrop or circumdances of the cafe. Pope Alexander II. condemns ordination per fahum, as they call it \ i. e. the leaping to a fuperior order without pading through the inferior. Ordination is one of the facraments of the church of Rome. In the edablidunent of Scotland, where there are no bilhops, the power of ordination is lodged in the pref- bytery, and by the Independents in the fufiVage of the people. See Episcopacy, PpiEsbyterians, and In¬ dependents. V ORDNANCE, a general name for all forts of great guns ufed in war. See Gunnery. Boring of ORDNANCE. Till within thefe 20 years, iron ordnance were cad with a cylindrical cavity, near¬ ly of the dimenfion of the caliber of the piece, wLich was afterwards enlarged to the proper caliber by means of deel-cutters fixed into the dog-head of a boring- bar-iron. Three fide cutters equididant were requifite to preferve the caliber draight and cylindrical j and a fingle cutter was ufed at the end of the bar to fmootli the breech of the piece. In boring ordnance cad hol¬ low, the piece was fixed upon a carriage that could be moved backwards and forwards in a direft line with the centre of a water-wheel; in this centre was fixed the boring-bar, of a fufficient length to reach up to the breech of the piece, or more properly to the further end OrcPstrcs. of the caliber. I he carriage with the piece being drawn backwards from the centre of the water-wheel to introduce the boring and finifhing bars and cutters, it is then prelfed forwards upon this bar by means of levers, weights, &.c. and the water-wheel being fet agoing, the bar and fullers are turned round, and clean out and fmooth the caliber to its proper dimenfions. Experience at lad pointed out many inconveniences arifing from the method of ending guns hollow, and widening the calibers by thefe boring bars. Tor the body of iron of the hollow-gun, being, at cading, in contadl with the core that made the caliber within-iide,, and with the mould without-fide, began to confolidatc towards thefe fides in the fird place, fooner than in the intermediate Ipace, where of courfe the cordraction of the iron takes place \ by which means, all guns cad hollow become more or lefs fpongy ■where they ought to have been mod com pa cl ; and numberlefs cavities alio were created round the cores, from dagnated air generated in them, which wrere too deep to be cut out by the boring. J o remedy thefe defeels, iron ordnance is nowr uni- verfally cad folid, by which means the column of iron is greatly enlarged, and the grain more compreffed y and the contraction of the iron becomes in the heart of the column, and confequcntly is cut out by the per¬ foration for the caliber. Guns are bored out of the folid reverfely from the pp.te hollow method. The piece A is placed upon two dan- GCCXC dards BR, by means of two journeys, turned round by the water-wheel C, the breech D being introduced into the centre of the wheel, with the muzzle towards, the Hiding carriage E, which is preffed forwards by a ratch F, and weights, in the fame way as the gun-car¬ nage was in hollow-boring. Upon this Hiding car¬ nage is fixed, truly horizontal and centrical to the gun, the drill-bar G, to the end of which is fixed a carp’s tongue drill or cutter H j which, being prefied for ward upon the piece whild it is turning round, perforates the bore, which is afterwards finilhed with bores and cut¬ ters as the hollow' guns w'ere. The principal difficulty of perforating folid guns truly centrical, arifes from the contraciiou of the iron above-mentioned ; which, refill¬ ing the drill unequally, tends to throw' it out of the centrical line. Office of ORDNANCE, an office kept within the Tower of London, which fuperintends and difpofes of all the arms, inftruments, and utenfils of war, both by foa and land, in all the magazines, garrifons, and forts, in Great Britain. We have the following copious ac¬ count of this eftabliffiment in Beatfon’s Political Index. In ancient times, before the invention of guns, this office wras fupplied by oflicers under the following names : the howyer, the crofs lawyer, the galeator or purveyor of helmets, the armourer, and the keeper of the tents; and in this Hate it continued till Henry-VIII. placed it under the management of a mailer, a lieute¬ nant, furveyor, &c. &c. Some improvements have been fince made; and this very important branch is now under the direftion of the mailer general of the ordnance, having under him a lieutenant general, a farveyor general, a clerk, a Itorekeeper, a clerk of the deliveries, and a treafurer, with a very great number of inferior officers, employed in Boring* of O H D X AXC E . PJato CCCXC. O R D f , On!’ ance. in the Tower of London, at Woolwich, and in almoft ^ - all the forts, garrifons, and principal ports in his Ma- jeily’s dominions. The office of ordnance is divided into x two diitinft branches, the ci\dl and the military 5 the latter being fubordinate, and under the authority of the former, l or the better underltanding the bufineis of the different oihcers, they lhall be dillinctly treated of, be¬ ginning with the principal one, viz. Majter General of the ORDNANCE is deemed the prin¬ cipal officer in the civil branch of the ordnance 5 yet he is always cliofen Irorn amongit the fir ft generals in his Majeliy s fervice. His truit is very great, as in him is vetted the foie power ot ftoring all the military magazines in the king’s dominions with proper munitions of war, and likewile to iupply the royal navy with what they may need in his department, the parliament granting money in the moft liberal manner for this purpoie. He is colonel in chief of the royal regiment of artillery, at prefent confiding of four battalions ; and he is inverted with a peculiar juntdidtion over all his majerty-s engineers employed in the teveral fortifications in his majefty’s domi¬ nions : and to him they are all accountable for their pro¬ ceedings, and from hirn they receive their particular or¬ ders and inrtrudlions, according to the diredrtions and commands given by his majefty in council. As mailer general of the ordnance he has the appointment of almofl all the inferior officers and fervants. He has a fecretary, and an under-fecretary ; and befides there is a fecretary and a counfel to the board of ordnance. Lieutenant General of the ORDNANCE receives all or¬ ders and warrants figned by the mailer general, and from the other principal officers, and fees them duly executed, iiTues orders as the occalions of the Hate require,, and gives directions for difcharging the artillery when required at coronations, birth-days, figiial vi(tories, and other folemn occafions. It is alfo his peculiar office to fee the train of artillery, and all its equipage, fitted for motion, when ordered to be drawn into the field, or fent upon any par- ticniar fervice. He is colonel en fecond of the royal re¬ giment of artillery, and has a fecretary and feveral infe¬ rior officers and clerks under him. Surveyor General of the ORDNANCE infpecls the ftores and provifions of war in the cuftody of the ftorekeeper, and fees that they are ranged and placed in fuch order as is moll proper for their prefervation. He allows all bills of deb'L and keeps a check upon all labourers and artificers work 5 fees that the ftores received be good and ferviceable, duly proved and marked, as they ought to be, with the king’s mark, taking to his aflift- ance the reft of the officers and proof-mafters. To aflifl him in the bufinefs of his office, he has under him the proof-mafter of England, and clerks, and other infe- • 1 ior officers. Clerk of the ORDNANCE, an officer whole function is to record all orders and inftructions given for the go¬ vernment of the office5 all patents and grants; the names of all officers, clerks, artificers, gunners, labourers, &c. who enjoy thole grants, or any other fee for the fame ; to draw all ellimates for provifions and fupplies to be made, and all letters, inftrublions, commifiions, deputa¬ tions, and contracts for his majefty’s fervice ; to make all bills of imprert and debentures, for the payment and fatisfaftion of work done and provifions received in the laid office; and all quarter books for the falaries and allowances of all officers, clerks, &c. belonging to the m 3 O R D oihce ; and to keep journals and ledgers of the receipts Oirtnar e, and returns of his majefty’s ftores, to ferve as a check O^ovkes. between the two accountants of the office, the one for vr~~w money, and the other for ftores. Storekeeper of the ORDNANCE takes into his cuftody all his majefty’s ordnance, munitions and ftores belong¬ ing thereto, and indents and puts them in legal fecurity, after they^ have been furveyed by the furveyor-general* any part of which he mufl not deliver without a warrant figned by the proper officers: nor mufl he receive back any lloies formerly iftued till they have been reviewed by the purveyor, and regiftered by the clerk of the ord¬ nance ^in the book of remains ; and he mult take care that whatever is under his cuftody be kept fafe, and in fuch readmefs as to be fit for lervice upon the moft peremptory demand. Clerk of the Deliveries of the ORDNANCE draws all orders for delivery of any ftores, and fees them duly exe¬ cuted ; charges by indenture the particular receiver of the ftcies delivered ; and, in order to difcharge the ftore¬ keeper, regifters the copies of all warrants for the deli¬ veries, as well as the proportions delivered. Treafurer and Paymajler of the ORDNANCE receives and nays all moneys, both falaries and debentures in and belonging to this office. In his office are feveral clerks, ordinary and extraordinary, for the difpatch of bufinefs. Office of Ordnance. Befides the principal officers al¬ ready mentioned, there belong to this office two proof- mafters ; a clerk of the works 3 a purveyor for the land, and a purveyor for the fea ; an architecl ; an aftrGnomi¬ cal obferver ; and other officers. The other part of this office, which is termed the military branch of the ord¬ nance, is a chief engineer, who has under him two direc-. tins, four fub-direftors, with an unlimited number of en¬ gineers in ordinary, engineers extraordinary, fub-engi- neers, and praiftitioner engineers. Ordnance Bills, commonly called ordnance deben¬ tures, are bills iriued by the board of ordnancev on the trealurer of that office, for the payment of ftores, &c. T. heie are not payable at any certain time, and do not. bear any intereft, fo that the difcount upon them is often very high ; but they are feldom much above* wo years m arrears. ^ ORDONNANCE, in architeflure, is the ccmpo- fition of a building, and the difpolition of its parts, botn with regard to the whole and to one another ; or, as Mr Evelyn expreffes it, determining the mfiafure of what is affigned to the feveral apartments. Thus ordon- nance is the judicious contrivance of the plan or mould; as when the court, hall, lodgings, &c. are neither too large nor too fmall, but the court affords convenient light to the apartments about it; the hall is of fit capa¬ city to receive company; and the bed-chamber, &c. of a proper iize. When thefe divifions are either too great or too fmall, with reifpefl to the whole, as where there is a large court to a little houfe, or a fmall hall to a magnificent palace, the fault is in the ordonnance. See Architecture. Ordonnance, in painting, is ufed for the difpofition of the parts of a pi&ure, either with regard to the whole- piece, or to the feveral parts, as the groups, maffes, con¬ trails, &c. See Painting. ORDOVICES, ancient Britons, of whom we have the following account in Henry’s Hiftory of Great Bri¬ tain. They lived “ in that country which is now called 3F2 No^h ORE [41 North Wales, and contains the counties of Montgomery, Merioneth, Caernarvon, Denbigh, and Flint. Thele Ordovices, or (as they are called by Tacitus) Ordeuices, are fuppofed to have been originally of the fame tribe or nation with the Huicii of Warwickfliire, who were under fome kind of fubjeclion to the Cornavii 5 but the Huicii of North Wales, being a free and independent people, were called Ordh Huici, ot the free Huici. When they wTere invaded by the Romans, they fhdwed a fpirit wor¬ thy of their name, and fought with great bravery in de¬ fence of their freedom and independency. Though they received a great defeat from the Roman general Ofto- rius, in conjunction with the Silures, they maintained the war for a conliderable time, until they were finally fub- dued, with great daughter, by the renowned Agricola. It was probably owing to the nature of the country, and 16 the vicinity of Diva, now Chefter, wdrere a wdiole legion was quartered, that the Romans had fo few towns or Rations in the territories of the Ordovices. Mediola¬ num, which is mentioned by Ptolemy, was the capital of the nation, and was probably fituated at Maywood, in Montgomery (hire. It wras a place of fome confidera- tion in the Roman times, but was afterwards quite de- molifhed by Edwin, king of Northumberland. Befides this, the Romans had a few other towns in this country 5 as Segontium, now Caernarvon ; Conovium, now Con- rvay ; and Varas, now Bodvary, which are all mentioned in the eleventh journey of Antoninus. The country of the' Ordovices was comprehended in the Roman province which was called Britannia Secunda.” ORE, a mineral body, partly or entirely compofed ORES, Reduction TN the treatment of metallic ores, it has been already hinted, that two objefts are in view: the one is to obtain ■a knowledge, of the nature and proportions of their com¬ ponent parts j and the other is to be acquainted with the beft methods of feparating the metals which they contain, that they may be applied in their pure or uncombined Rate, to ufeful purpofes. In the following treatife, there¬ fore, we fhall keep in view the fame objects : and under each of the metals we fliall firfl detail the mofl improved methods of analy&sg its different ores *, and, fecondly, give a fhort account of \he beR and moR approved proceffes that are employed in their reduction. The laR objeft, however, refers only to Tome of the metals, others not being found in fufficient quantity, or not being applicable to ufeful purpofes. In this treatife we fliall confider the metals in the fame order in which they have been defcribed under Mineralogy, and to each metal we fliall devote a particular chapter. Chap. I. Of the Ores of Platina. Platina, on account of its infufibiKty, denfity, and indeflruftibility, is one of the moR important and ufe¬ ful of the metals yet known, and particularly for diffe¬ rent chemical inffruments and utenfils, becaufe there are few chemical agents whofe effects it cannot refifl. Pla¬ tina is onl^ found in the Rate of alloy, with rhodium ^pd pallad^m, two of the newly difccvered metals $ and 2 ] ORE of metallic fubflances, in the natural Rate in which it exifls in the earth. Metallic fubflances are found, either native, that is, pure, and uncombined with other fub- Rances, or alloyed with other metals, or combined with oxygen, or fulphur, or with acids \ and thus it appears, that metals exifl in ores, in four different Rates. 1. In the metallic Rate, when they are either pure, or com¬ bined wdth each other, as in the Rate of alloy. 2. In the Rate of an oxide. 3. Combined with fulphur in the Rate of fulphuret. And 4. with acids, forming falts. For the particular defcription of ores, fee Mineralogy j and for the mode of their diRribution in the earth, fee Geo¬ logy. But ores are rarely found exadlly in the Rate of com¬ bination now mentioned. It feldom indeed happens, that they are not mixed v.dth various earthy minerals. As all metals are extra&ed from ores, it is of great im¬ portance to be acquainted in the firfl place, with the materials of which they are compofed, as they are ob¬ tained from the earth, with the view of afcertaining the nature and proportions of the various ingredients which enter into the compolition •, and in the fecond place, to know the fimplefland eafieR proceffes by which the metals may be feparated, for the purpofes of economy and manufadtures. Hence, in the treatment of ores, two objects are in view. The firfl is their analyfis, which is the province of the chemical philofopher •, and the fecond is their reduction in the large way, which is the bufinefs of the metallurgifl. The moR improved methods for accompliflring each of thefe objects, will be detailed in the following treatife. and Analysis of. it is accompanied alfo with another alloy, iridium and ofmium, alfo newly difcovered metals, as well as with particles of iron, gold, and fome other fubflances. The difcovery of thefe metals, and the importance of platina itfelf, have rendered the ores of this metal peculiarly in- terefling. We fliall therefore in the prefent chapter, give a pretty full detail of the methods of analyfing the ore, and of working it for the purpofes of manufacture. Thefe fubjefts will occupy the two following fections. Sect. I. Of the Analyfis of the Ores of Platina. The whole of the platina which is brought to Europe, has been previoufly fubjedted to the procefs of amalga¬ mation in South America *, and hence it happens, that a fmall quantity of mercury remains in it, fometimes in very fmall diffindl particles*, but more commonly in a Rate of combination with gold, in the form of an amal¬ gam. In treating the ores of platina, therefore, the firfl objeft is to feparate the mercury, and the eafieR procefs is to drive it off by means of heat, either in an open ladle, if it be not intended to colledt the mercury, or in an earthen retort, if the objedt of the operator be to re¬ tain that metal. The platina remaining after the mer¬ cury is thus driven off, appears much yellower, becaufe the particles of gold difperfed through it exhibit their peculiar colour. The ore is next to be fpread out thin on a fmooth table, and by means of a pair of common bellows, the lighter particles may be feparated with to¬ lerable Chap. X. , O R hi Platina. lerable accuracy from the heavier or.es. The lighter particles in the ore are found, on examination, to be mi¬ nute cryftals and fragments of quartz, and two kinds of iron ore, which are alfo in fragments, or in the form of fmall oftahedrons. Some of the particles of iron are attradled by the magnet, forming the ore of iron called magnetic iron-fand; but others, which are not attracted by the magnet, give out, when roafted, a flight lulphu- reous odour. The lighter particles being feparated by mechanical aclion, the heavier particles are to be treated with a fmall quantity of llightly diluted nitro-muriatic acid, and by this means the whole of the gold is taken up, with a portion of iron, and a fmall quantity of platina and the other ingredients. The gold may be thrown down from this iolution by adding green fulphate of iron, and it may be purified by mixing it with nitre and borax. If the quantity of platina to be purified be con- fiderable, it is an objeff rvorth the attention of the chemifl, to feparate and collefr the gold, becaufe the proportion of the latter contained in crude platina is not fmall. Prouft obtained feven ounces of gold from a quantity of platina confifting of 100 ounces ; and from another quantity of the fame weight he feparated not * Ann. de lefs than 13 ounces of gold*. It may be obferved that Chtm\. the platina which is whiteft, is found to be the richelt in xxx vm. I46‘g0ld, and that the black varieties fcarcely contain any at all. The gold being feparated, the platina is next to be digefted in nitro-muriatic acid, and excepting a black matter, the whole is diflblved. This black matter, wdren firft obferved, wms fuppofed to be plumbago 5 but it appears from the difcovery of Mr Tennant, to be a compound of twTo new metals, to which he has given the names of ofmium and iridium. By adding muriate of ammonia to the nitro-muriatic folution, almoft the whole of the platina is precipitated in the form of a yellow powder. This pow'der is a muriate of ammonia and pla^ tina, and it is nearly infoluble. The folution being next treated with zinc, the whole of its metallic contents, ex¬ cepting the iron, are thrown dowm. The precipitate thus obtained is to be walked and digefted in nitric acid much diluted. By this means the copper and lead with which crude platina is ufually contaminated, are fepa¬ rated. The remainder is to be diffolved in nitro-muria¬ tic acid : to the latter folution add common fait, and evaporate the whole to drynefs *, the fait remaining con¬ tains the muriates of foda and of platina, palladium and rhodium 5 and as the fait of rhodium is found to be in¬ foluble in alcohol, it may, by means-of it, be feparated from the former. The platina and palladium now remain in the alcoholic folution, and from this the greater part of the platina may be feparated by means of muriate of ammonia ; and after diluting the folution by adding pruftiate of potalh, a deep orange precipitate is obtained, which is palladium. By concentrating the remaining li¬ quor, the platina may be precipitated by means of muriate of ammonia. Sect. II. Of the Metdiods of working Platina. Platina, on account of its peculiar properties in refill¬ ing great degrees of heat and the action of many of the moft powerful chemical agents, is by far the moft impor¬ tant and valuable of the metals yet known for the pur- 4iS Platina. S, &c. pofe of conftru£ting various inftruments and utenfils which are found highly ufeful in chemical-analyfis. But ' v the refraclory nature of this metal has prefented many difficulties, and has greatly exercifed the ingenuity and Ikill of chemifts and artifts to render it malleable and capable of affuming the requifite forms. It has been ob- icrved that the largeft and whiteft grains picked out from crude platina have a confiderable degree- of mallea¬ bility even when cold ; but when they are heated, this property appears in greater perfection : and if two of thefe grains be brought into contact, and fubje&ed to the higheft degree of white heat, the ftroke of a hammer will make them adhere more or lefs perfectly, i 1 this way, a fmall mafs of metal may be obtained by the union of a few grains. But it is obvious that the patience and dexterity required in this flow and tedious procefs will prevent it from being pradlically ufeful. In the progrefs of experiments made on platina, it was difeovered that arfenic combined readily with that metal, and formed an alloy of eafy fufibility. The great vola¬ tility of the arfenic, particularly when in contadl with charcoal, gave reafon to hope that the whole of it, by proper management, might be driven off, leaving the platina behind in a mafs, and retaining its. peculiar and charafleriftic properties. In this wTay difterent chemifts fucceeded in forming, of this alloy, crucibles and other chemical utenfils, which were found to be lefs fufible than filver, and were capable of refilling many of the comrpon chemical agents. The moft fuccefsful me¬ thod of rendering platina malleable, and working it by means of this alloy, was difeovered by Jeanety, a Parifian filverfmith, who long direfled his attention to this objefl. An account of his method has been given by Berthollet and Pelletier, of which the following is an abftrafl*. * . , 1 ke crude platxna being firft ground in water, and Chim. xir. walked for the purpofe of feparating the earthy matters, 20. three half pounds of the metal, three pounds of white arfenic, and one pound of pearl allies, are to be well mixed together. A crucible, capable of holding 20 pounds of this mixture, is then to be placed in a furnace of any convenient conllruflion. When the crucible is" thoroughly red-hot, introduce one-third of the mixture, and continue ftirring it with a rod of platina till it comes to a ftate of quiet fufion; then add another one-third, ftirring it in the lame manner till the fufion is comple¬ ted, and afterwards add the remaining one-third, and apply a ftrong her t, fo that the whole may become very fluid. Then withdraw the crucible, and when it has cooled gradually, break ft up*, a well formed me¬ tallic button will be found in it, covered by blackifli brown fcoriae, which has a confiderable aclion on the magnetic needle. The button, which is very brittle, being broken to pieces, is to be fufed again with white arfenic and pearl alhes as before, and the metallic maf? obtained from this fecond fufion is generally found to have no effedl on the magnetic needle*, but if this Ihould not be the cafe, a third fufion in the fame wray becomes neceffary. The firil ftep of the procefs is now completed. A flat-bottomed cylindrical crucible, about three inches and a half in diameter, is to be made thoroughly hot in a. furnace, and charged with one pound and a half of the arfenicated platina, mixed with an equal weight of white arfenic, and one half pound of pot-alh j and when this- mixture ORE mixture Iras been completely fund, the crucible is to be removed from the fire, and allowed to cool in a horizon¬ tal petition, that the thicknefs of the cake of metal may be uniform. When the crucible is cold, it is to be care¬ fully broken, and the fcorim being removed, a cake of metal is obtained, well-formed and fonorous, weighing three ounces more than the arfenicated platina employed. The metal is now quite faturated with arfenic. It has been obferved, that there is no inconvenience from in¬ corporating too much arfenic, for it would appear that the full fuccefs and rapidity of the purification of the platina, are exattly in proportion to the quantity of ar¬ fenic Avith which it has previoufiy combined.. The mafs of metal thus obtained, is placed in a muffle, and the heat is gradually increafed, till the evaporation of the arfenic commence •, after which the temperature is to be kept up as nearly as poffibie at the fame degree, for the fpace of fix hours, carefully watching not to in- creafe it, left the cake fhould be brought to a ftate of fu- fion. At the end of the fix hours, the cake has ufually become confiderably porous ; it is then to be withdrawn, and extinguifhed in common oil} after which it is re¬ turned to the muffle, by which means a further quan¬ tity of arfenic is drawn off; and this alternate heating and application of oil are to be continued till the arlenic no longer makes its appearance. In proportion as the arfenic°is driven off, the fufibility of the mafs diminilhes, fo that a greater degree of heat may be applied in the latter ftage of the procefs. After having carefully ournt off at a high degree of heat the whole of the charcoal which is produced by the decompofitlon of tne oil, the fpongy cake of metal is to be digefted in nitrous acid, and then edulcorated by repeated boiling in water. Three or more of the cakes are then to be placed in a crucible, and expofed to the higheft degree of heat in a powerful furnace, and while they are thus rendered loft, an iron peftle let down upon them, wTill make them co¬ here •, and being withdrawm from the crucible, they are to be heated to the utmoft in a fmith’s fire, and carefully forged like iron on the anvil, into compact bars. The cheapnefs of the procefs now. detailed is the only advantage which it holds out, for the platina does not *equire to be previoully diffolved in nitromuriatic acid j but it is to be obferved, that the metal by this treatment is by no means perfeftly pure ; a fmall portion of arfe- nic and iron ftill adhering to it, and probably feme lead and copper, which may have been accidentally mixed with the ore, while it contains the Thole of the palla¬ dium, ofmium, iridium, and rhodium 5 and thus con¬ taminated, it is obvious, that it muft be lefs capable of refifting the adlion of alkalies, and high degrees of heat without injury, than when it is brought to a ftate of greater purity. Accordingly, other proceffes for the purification of this valuable metal, have been contrived and praftifed. The following is the procefs propofed by Count Mouf- fm Poulhkin, to render platina malleable. 1. Precipi¬ tate the platina from its folution by muriate of ammonia, and walh the precipitate with a little cold water. 2. “ Reduce it in a convenient crucible to the well- known fpongy metallic texture, which walh two or three times with boiling water to carry off any portion wf faline matter which may have efcaped the action of the fire. 3, Boil it for about half an hour in as much water, 2 S,-&c. . ' Ch mixed with one-tenth part of muriatic acid, as will cover the mafs to the depth of about half an inch, in a conve- ^ nient glafs veffel. This will carry off any quantity of iron that might Hill exift in the metal. 4. “ Decant the acid water, and edulcorate or ftrong- ly ignite the plating. C. “ To one part of this metal take two parts of mer¬ cury, and amalgamate in a glals or porphyry mortar. This amalgamation takes place very readily. The pro¬ per method of conducting it is to take about two drams of mercury to three drams of platina, and amalgamate them together 5 and to this amalgam may be added al¬ ternate fmall quantities of platina and mercury till the whole of the two metals are combined. Several pounds may be thus amalgamated in a few hours, and in the large wray a proper mill might fflorten the operation. 6 A After the amalgam is completely produced, it muff by quickly moulded in bars or plates, or any other forms that maybe preferred; taking care that thefc moulded pieces Ihould at leaft be half an inch in thick¬ nefs, and of a proper length to manage them afterwards in the fire ; it is rdfo requifile that the mould Ihould be perfectly even and fmooth. Half an hour after the pieces are foimed they begin to harden by the oxidation of the mercury, and change their brilliant metallic colour for a dull leaden one. 7. u As foou as the pieces have acquired a proper de¬ gree of hardnefs to be handled without danger of break¬ ing, which commonly takes place in a little more than an hour, place them in a proper furnace, and keep them ignited under a muffle or in a fm'all reverberatory. No other precaution is neceflary in this operation, but that of not breaking the pieces during their tranfport. The mercuryflies eff during the heat, arid the platina re¬ mains perfectly folid; fo that, after being ftrongly ig¬ nited two or three times before the bellows, it may be forged, or laminated in the fame manner as gold or fil- ver; care being taken, at the commencement of the forging, or of paffmg it between rollers, not to apply too great a force till the metal has acquired all its denfity. It is almoft fuperfluous to add, that in evaporating the mercury from large quantities of amalgam, a proper ap¬ paratus, fuch as in the filver amalgamation, muft be em¬ ployed to receive the volatilized mercury; but for fmall quantities, where the lofs of this metal is of no confe- quence, the furnace muft have a proper chimney to car¬ ry off the metallic vapours. When the platina comes out of the firft fire, its dimenfions are about two thir¬ teenth parts fmaller every way than the original amal- «gam from the mould. The whole of tins operation feems to be governed by the preffure of the atmofphere and the laws of cohefive attraction : for the air is driven out from between the molecules of the platina, which by their folution in mercury are moft probably in their primitive and confequently uniform figure. It is very vifible, and at the fame time a very amufing phenome¬ non to obferve, (during the procefs of ignition, which is performed in four or five minutes) how the platina contracts every way into itfelf, as if preffed by fome ex¬ ternal force.” The count then adds, “ that, as foon as my amalgam of mercury is made, I comprefs the fame in tubes, of weed, by the preffure of an iron ferew upon a cylinder ot wood, adapted to the bore of the tube. This forces out the fuperabundant mercury from the amalgam, and renders Chap*. I. ORE Platina. renders it folid. After two or three hours I burn upon '—v the coals, or in a crucible lined with charcoal, the Iheath in which the amalgam is contained, and urge the fire to a white heat j after which I take out the platina in a very * Nirhol. folid ftate, fit to be forged*.” Jout n. ix. A fimpler method for rendering platina malleable, and “S- at the fame time not lefs effeftual, has been propofed by Mr Knight. The following is an account of this me¬ thod in the words of the author. “ To a given quantity of crude platina I add fifteen times its weight of mtro-muriatic acid (compofed of equal parts of nitric and muriatic acids) in a tubulated glafs retort, with a tubulated receiver adapted to it. It is then boiled, by means of an Argand’s lamp, till the acid has affumed a deep faffron colour: it is then poured off; and if any platina remain undiffolved, more acid is added, and it is again boiled until the whole is taken up. The liquor, being fuffered to reft till quite clear, is again decanted : a folution of lal-am- moniac is then added, by little and little, till it no longer gives a cloudinefs. By this means the platina is thrown down in the form of a lemon-coloured precipitate, which having fubfided, the liquor is poured off, and the preci¬ pitate repeatedly walked with diftilled water till it ccafes to give an acid tafte } (too much water is injurious, the precipitate being in a certain degree foluble in that li¬ quid) : the water is then poured off, and the precipitate evaporated to drynefs. “ So far my procefs is in a great meafure fimilar to that which fome others have alfo followed •, but my method of managing the fubfequent, and which are indeed the principal manipulations, will be found to poffefs many advantages over any that has yet been made public. The belt procefs hitherto followed has been, to give the pre¬ cipitate a white heat in a crucible, which in fome mea- lure agglutinates the particles.*, and then to throw the mafs into a red-hot mortar, or any fimilar implement, and endeavour to unite them by ufing a peftle or Ham¬ per. But the mafs is fo fpongy that it is hardly poflible to get a Angle ftroke applied to it before the welding heat is gone 5 and though by peculiar dexterity and addrefs lome have in this way fucceeded, it has been found to require fuch innumerable heatings and ham¬ merings, that moft of thofe who have attempted it, have cither failed entirely, or given it up as being too labori¬ ous and expenfive. I have fitcceeded in obviating all thefe difficulties by adopting the following fimple, eafy, and expeditious method :— “ A ftrong, hollow, inverted cone of crucible earth being procured, with a correfponding ftopper to fit it, made of the fame materials, the point of the latter is cut off about three-fourths from the bafe. The platina, now in the ftate of a light yellow powder, is preffed tight into the cone, and, a. cover being fixed flightly on, it is placed in an air furnace, and the fire raifed gra¬ dually to a ftrong white heat. In the mean time the conical ftopper, fixed in a pair of iron tongs fuitable for the purpofe, is brought to a red or to a bright red heat. The cover being then removed from the cone, the tongs with the heated ftopper is introduced through a hole in the cover of the furnace, and prefled at firft gently on the platina, at this time in a ftate nearly as fdft as dough, till it at length acquires a more folid confiftence. It is then repeatedly flruck with the ftopper, as hard as the nature of the materials will admit, till it appears to re- S, &c. 4 ceive no farther impreftion. The cone is then removed Piam from the furnace, and being ftruck lightly with a ham- mer, the platina falls out in a metallic button, from which ftate it may be drawn, by repeatedly heating and gently hammering, into a bar fit for flatting, drawing into wire, planiftting, &c. “ Befides the comparative facility of this procefs, it has the farther advantage of rendering the platina much purer than when red-hot iron is obliged to be had recourfe to ; for platina, when of a white heat, has a ftrong af¬ finity for iron, and, with whatever care it may have been previoufly feparated from that metal, will be found to have taken up a portion of it, when it is employed of a red heat, to ferve to unite the particles of the platina. To the luperior purity of platina, rendered malleable by the procefs before defended, I attribute the greater fpe- cific gravity which I find it to poffefs, than that prepared by other methods. Having taken the fpecific gravity of about ten pennyweights of it, which I had previoufty paffed repeatedly through a flatting mill, I found it to be 2 2.26f.” • f Pi//. Another method, which has been fuccefsfully pracli- V1 fed, was contrived by Mr Cock. The following is an account of his procefs. After the folution of the platina in nitro-muriatic acid, the liquor is filtered through clean fand, for the purpofe. of feparating the black powder which floats in it. The clear folution is then decom- pofed by means of fal ammoniac ; the yellow precipitate being coliefled, is to be moderately well waftied in warm water and dried j and being diftributed into laucers placed in a fmall oven, conftrufted for the purpofe, in which they are to be expofed for a ftiort time to a low red heat, that the platina may be brought to the metallic , ftate, and the greater part of the fal ammoniac may be fublimed. When the platina, after this treatment, is withdrawn, it is in the form of a gray coloured, fpongy mafs ; and in this ftate half an ounce of it is to be put into a ftrong iron mould, one inch and a half wide, and two and a half long. It is then to be compreffed as ftrongly as pofiible, by ftriking with a mallet upon a wooden peftle accurately cut to fit the mould ; another half ounce is then added, and treated in the fame man¬ ner, till fix ounces have been forced into the mould : a loofe iron cover, juft; capable of Aiding down the mould, is then laid'upon the platina. This part of the procefs requires particular care *, for if any material quantity of air be left in the mafs, the bar into which it is formed is extremely apt to fcale and be full of flaws in the fub- fequent operations. The preffuro being properly made, the mould is to be taken to pieces, and the platina will be found in the form of a denfe compact parallelepiped. It is next to be placed in a forge fire of charcoal, and heated to the moft intenfe white heat, in order to drive off the muriate of ammonia which remains: this being done, it is to be quickly placed on a clear bright anvil, and gently hammered in every dire6tion by a clean hammer. This is feveral times to be repeated, at the end of which the mafs wall be perfectly compaft, and fit to be laminated or wrought in any other manner at the pleafure of the artift. It is to be obferved^ that while the platina is heating, it muft be loofe in the fire, for if it were held by the tongs, they would infallibly become wrelded to the platina, and by this means greatly damage it. When the platina is thus drawn down to a compact bar, h will be covered by a femivitreous cruft, fomewhat 416 ORE Gold. fomewliat reddifh, chiefly proceeding from particles of the allies melted down upon it, and extended by the hammer over its furface. To remove this, the bar, af¬ ter being made red hot, is to be fprinked over with glafs of borax reduced to powder, and then kept at a white heat for a few minutes j it is to be plunged into diluted muriatic acid when moderately cool, by which the borax and other vitreous matters will be dilfolved, and the platina with a perfectly clean white furface left be- * Aikin's hind *■ Diftion. of Chem. See. Chap. II. Of the Ores of Gold. Gold exifts in nature only in the metallic Hate j but it is fcarcely ever found perfectly pure, for it is alloyed in different proportions with filver, copper, tellurium, and fome other metals. When it is alloyed with filver or copper, or even with both, the gold retains its ducti¬ lity j but when combined with tellurium, its diftinftive charadlers entirely difappear. S, &c. Chap. II. faturated with muriatic acid, a rod of zinc being intro- Gold, duced, will precipitate the copper in the metallic ftate. r-“-/ Auriferous pyrites. It appears that iron pyrites of a bronze yellow colour in maffes, or in ftriated cubes, and hepatic pyrites, which are found in veins in primitive mountains, contain a quantity of pure gold, or of gold alloyed with lilver, which is worth the trouble and ex¬ pence of extracting it. A confiderable proportion, not only of the American, but alfo of the Hungarian gold, is obtained from ore of this kind. The produce of the latter fometimes does not exceed a few grains of gold in the quintal, but occafionally the auriferous pyrites of the Hungarian mines yield not lefs than 450 ounces of gold ih the quintal of the ore. The following is the method of analyfis to be fol¬ lowed in ores of this kind. The pyrites being reduced to powder, is digefted in muriatic acid, occafionally adding a fmall portion of nitric acid, till every thing foluble is taken up. The reiidue, after being well wafli- ed and dried, is to be weighed, and expofed to a heat which is juft fufficient to burn off the fulphur, the quan¬ tity of which is indicated by the lofs of weight. The refidue is again to be digefted in nitro-muriatic acid, and this folution is to be added to the firft. The earthy refidue, which contains the filver in the ftate of muriate, is then to be fufed with an equal weight of glafs of bo¬ rax, and three times the quantity of pearl allies. By this procefs the filver is reduced and may be feparated from the alkali and the earth by means of muriatic acid very much diluted. The nitro-muriatic folution isTo be neutralized by a fixed alkali, and if it be afterwards treated with nitrate of mercury prepared in the cold, the gold will be thrown dowm in the ftate of a brown powder. It may be reduced to the metallic ftate by filling it with nitre. The oxide of iron which remains in folution, may be obtained in the ufual way in the ftate of magnetic oxide. Auriferous galena.—Galena, or the native fulphuret of lead, almoft always contains a fmall portion of filver, and very often it is in fuch quantity as to be worth the trouble of extraditing it. Galena fometimes has alfo combined with it a little gold as well as filver, and it is worked as one of the ores of gold. This is the cafe with fome of the galena of Hungary, as that of Boicza yields i^oz. of alloy in the quintal, of which 31 parts are filver, and one of gold. The analyfis of auriferous galena is to be conducted nearly in the fame way as the auriferous pyrites. The pulverifed ore being digefted in nitro-muriatic acid, the gold and the lead, and, if any are prefent, the iron and antimony, are taken up •, leaving behind the earthy matters, as well as the fulphur and filver, which may be feparated according to the method employed in the for¬ mer procefs. By gradually evaporating the nitro-muria¬ tic folution, a cryftallized muriate of lead is obtained and by again diluting the folution wdth water, the gold may be feparated by adding nitrate of mercury. The analyfis of the ores of gold containing tellurium, will be given under the head of that metal. Sect. II. ReduBion of the Ores of Gold. Many of the moft profitable veins of gold are of tri¬ fling magnitude, but at the fame time yield ample re¬ turns to the miner, although they are mixed with fo large Sect. I. Of the Analyfis of the Ores of Gold. The method of analyfing gold ores is very Ample. The principal difficulty with which it is attended arifes from the fmall proportion of this metal contained in the greater part, even of thofe ores which are confidered as very rich. Native gold contains invariably, but generally in fmall proportion, filver or copper, and fometimes both, and the gangue is often a very hard quartz. In this cafe the following is an approved mode of proceed¬ ing. Reduce the ore to fine powder, mix it with fix times its weight of carbonate of foda, or, what anfwers better, with four parts of carbonate of foda, and one of glafs of borax: put the mixture into an earthen crucible, and melt it. Pour out the fufed mafs on a ftone flab, and detach the fmall portion remaining in the crucible by means of a little diluted muriatic acid. Reduce the mafs to coarfe pow'der \ put it into a flafk with the muria¬ tic folution j add ftrong muriatic acid, and apply a gentle heat. Continue the digeftion, adding from time to time a little nitrous acid, till no farther a&ion is produced, and the undiffolved refidue becomes of -a pure white co¬ lour. Then pour off the liquor, wafti the refidue, and add the wafliings to the liquor. 1. After the infoluble refidue is dried, expofe it to the fun, and if it contain any muriate of filver, it will affume a purplifti colour. When this is the cafe, let it be mixed with three times its weight of pearl afti, and fufed in an earthen crucible for five minutes. The filver will thus be reduced to metallic globules, and will be obtained pure by digefting it in muriatic acid, which combines with the earth and alkali, but does not aft on the filver. 2. The nitro-muriatic folution is now to be carefully neutralized by means of foda or of potafti j and a folution of green fulphate of iron is to be added, as long as any precipitate is formed. The precipitate thus obtained is gold, and this being carefully collefted, is to be fufed in a fmall crucible with nitre juft in fufficient quantity to cover its furface. 3. The refidual liquor, after being decompofed by the carbonate of an alkali, and the precipitate being w ell wafhed, is to be digefted in liquid ammonia, todiffolvethe copper. The ammoniacal folution being flightly fuper- 4 Chap. II. - ORE Gold, large a proportion of flony matter and oilier impurities as *-Y~— would render the working of any other metal altogether unprofitable. This obvioufly arifes from the great com¬ mercial importance of gold compared wdth other metals, which no doubt is owing a£ well to its rarity as to its peculiar properties. In the Hungarian gold mines, which are the richeft yet known in the old continent, the attention of the miner is not merely limited to the firings of ore, but to the whole contents of the vein, which are ufually extracted and raifed to the furface in large mafles. Thefe maiTes are diftributed to the work¬ men, who break them down, firft with large hammers, and afterwards with fmaller ones, till they are reduced to pieces of the fize of a walnut. In the courfe of this procefs, every piece is carefully examined, and arranged according to its value. The fmalleft vifiible grain of native gold is feparated from the quartz in which it is chiefly imbedded, and put by itfelf. The auriferous pyrites and galena are alfo put into feparate heaps ; even the fmall fplinters that are detached in breaking down the mafles, and the fand and mud of the mine, are all collefted, waflied, and fifted, and arranged according to their apparent richnefs. What has been rejected in the flrfh examination, is -re-examined by boys, whofe labour is not of great value, and who pick out aLmoft the whole that has been overlooked by the men, and ar¬ range it in the fame manner. The native gold with the matrix attached to it, is again to be broken by hand into Hill fmaller pieces, by which means other impurities and Itony matters are fe¬ parated. The ore is then introduced into a wmoden box floored with call-iron plates ; and by the aftion of two or more heavy fpars of oak, which are Ihod wdth iron, and alternately WTorked like the common flamping mill, it is reduced to a fine powder. This powder, wdiich is called flour, is then removed into a veflfel like a large bafon, and is mixed with fuch a quantity of fait and wa¬ ter as will render it damp. The workman then takes a thin porous leather bag, introduces a quantity of mer¬ cury into it, and by a regular and continued preffure forces the mercury in very minute drops through the leather. In this divided Hate it falls upon the pulverized ore, and is im¬ mediately kneaded up with it, till the requilite quantity, which depends on the proportion of gold, has been added. After completing this part of the procefs, the next objedl is to incorporate the mercury and the gold. This is ef¬ fected by rubbing the mixture together for fome time by means of a wooden peftle. The mixture is then heated in a proper veflel, and fubjefted for three or four days, to the temperature of boiling water •, and, laftly, the mix¬ ture is to be carefully walhed by fmall parcels at a time, fo that the earthy particles may be carried off by the nea¬ ter. The mercury combined with the gold, only remains behind, in the form of amalgam. A portion of this mer¬ cury is then feparated by preffure in a leathern bag, and the remainder is driven off by diflillation, leaving behind the gold and filver with which it may be alloyed. But a more complicated procefs is requifite in feparat- ing that portion of the gold which is invifibly difperfed in the pyrites, in galena, and other metallic fubflances, as wxdl as the ftony parts of the matrix. In the treat¬ ment and forting already deferibed, thofe ores are fepa¬ rated, not only according to their apparent richnefs, but they are arranged alfo according to the degrees of hard- nefs. They are then carried to the flamping mill, of Vol. XV. Part II. S, Sec. 417 which the principal parts are, 1. The coffers or ciftems, Gold, in which the ore is reduced to powder, and through which ——v*~—' a flream of water continually paffes, and fo managed as tobeinCreafed ordiminithed at pleafure : 2. The Hampers, or vertical beams, which are {hod with iron ; and 3. The axle, which is fixed horizontally, and one end of which works in a pivot, while the other is rivetted into the centre of a large water wheel. The mode of action of this apparatus is obvious. A ftream of wrater falls upon the wheel, and turns it round, as well as the axle to which it is attached. The cogs, which are faltened to the axle, alternately raife the Hampers to a given height, and then let them fall upon the ore placed in the coffers. And as the ore is fufficiently broken, it is carried by the flream of water continually paffmg through, out at the fides of the coffer into the labyrinths, wThere the flony and metallic contents of the ore are depofited, according to their fpecific gravity, nearer to or at a greater diflance from the aperture. The coffer is a rectangular hole funk below the level of the ground, and it is about five feet in length, two feet and fometimes lefs in width, and four feet deep. Five Hampers are employed, they are Hrong oaken beams fliod with iron, and weighing about 200 pounds each. They are placed fide by fide, at the diflance of about 2^ inches from each other. When the ore is to be pounded, the firft thing is to cover the bottom of the coffer with a flooring or pave¬ ment, compofed of large pieces of the hardeft and pooreft part of the vein. Thefe pieces are to be clofe fet toge¬ ther, and a floor of this kind is found to anfwer better than an iron floor. The thicknefs of the floor is to be proportioned according to the degree of hardnefs of the ere to be pounded j for it is obvious that the higher it is, the fmaller will be the fpace through w'hich the Ham¬ pers fall; and their momentum will therefore be propor¬ tionally diminifhed. One precaution muft be invariably obferved, that the part of the floor immediately under the middle flamper be about two inches lower than that below the ftamper on each fide, and that this again be an inch lower than that beneath the two outermoft Hampers. After the coffer is thus prepared, the machinery is fet in motion, a fmall Hream of w ater being allowed to flow into the coffer. The ore is to be carefully thrown in, jufl below the middle flamper, or the proper quantity is fupplied by means of a hopper. The ore being thus broken down by the middle ftamper, is gradually deli¬ vered to the Hampers on each fide, where it is ftill far¬ ther reduced tp powder, and from them it paffes on to the twTo outermoft Hampers, where it is reduced to fuch a degree of finenefs as to be for a lime fufpended in the water, and carried along with the ftream through the openings at the ends of the coffer. In ftamping the ores of gold and filver, great atten¬ tion is neceffary, that no pieces of ore be fubjefted to the procefs that can be conveniently feparated from the gangue by the hand 5 and that the ore be reduced to a coarfe or fine powder, according to its nature. When na¬ tive gold is difperfed in minute particles, in a hard fili- ceous matrix, it is found impoflibie to feparate the wdrole of the metal, unlefs it be very finely pulverized ; and in this cafe the ore may be reduced to fine powder, both on account of the great difference of the fpecific gravity of the two ingredients of the ore, and alfo becaufe the fili- ceous particles, however minute, acquire no degree of tenacity, fo as to adhere to the particles of gold. In 3 G ftamping 4iS - O K E ^ Gjld. {lamping ores of tills kind, therefore, the coffers may be fet very low, that the hampers may have the greater power, and a fmall flream of water only may be let in, that the current which pafles out may carry with it only the fmaller particles. But when the gold is difperfed in art indurated and ochrey clay, or in calcareous fpar ; if the ore in this cafe be not finely pulverized, a great pro¬ portion of the metal will be retained in the earthy ma¬ trix ; and if the {damping be continued too long, the whole will be brought to a fluid mud, which will pre¬ vent the fubfidence of the particles of gold. In the management of this part of the procefs, no fmall degree of {kill and experience is requifite, to obtain the great ell produce of gold. The reduction of the ore to grains of a uniform fize, greatly facilitates, the waffling which follows the {lamp¬ ing, and yields a greater produifl of metal. This is ef- fedffed by taking care that the ore, when find introduced into the coffer, fliall fall under the middle flamper, and alfo by the velocity of the water wheel being properly regulated. When the motion of the {tampers is too flow, lofs of time is the only confequence 5 but when the motion is greatly accelerated, the water is violently thrown about, carrying with it to the apertures at the end* of the coffer, pieces of the ore that are not fufficient- Jy comminuted. The ore being reduced to particles of a fufficient de¬ gree of finenefs to be carried by the force of the water out of the coffer, paffes into fliallow channels of different dimenfions. Thefe channels or troughs, the whole feries of which is called a labyrinth, are conftrufted of wcod •'Or Hone, and communicate with each other at the extremi- lies. The various parts of the ore are depofited in thefe channels, according to their fpecific gravities; the hea- vieft particles are detained in the firft, and the lighted: are carried along, and fubfide in the lafi: and loweft. Each of the channels has a groove at its lowell extremity, and thus admits of being clofed at pleafyre by pieces of wood about an inch in height, which flide down upon each other. By varying the rapidity of the current through the channels, the heavy particles can be more accurately feparated from the lighter ones, which is done by diminiihing the flope, and increafing the width and length of the channels. But with whatever care the firft operation of the waffling may be conduced, it is by no means fufficient to feparate the whole of the fand from the ore. A fecond waffling on tables, as they are called, is requifite. Thefe tables are long wooden planes, which are confi- derably inclined, and are croffed at regular diflances by narrow fliallow grooves. A long wicker halket, or perforated wooden trough, filled with the waffled ore, is fixed to the upper extremity of the table, and a fmall llream of water is admitted, which paffing between the twigs of the bafket, carries with it particles of the ore. Thefe particles are either carried by the current off the table, or are depofited, according to their fpecific gravity, in the grooves, the heaviell particles fubfiding firff. In this way the auriferous ores of iron and copper pyrites, galena, &c. are fufficiently feparated from the quartz and other ftony matter, to be fit for the furnace but for the ores of native gold, a third waffling is necef- fary. This is performed in fmall quantities at a time, in a wooden veffel refembling in fliape a common fire ffiovel without a handle, but having the fidcs more elevated, and S, &cc. Chap. If. being furnifiied with two ear-, by which it is held during Gold, the operation, ihe ore is put into this veffel, which is ^ gently immerfed in water, and a circular motion is com¬ municated to it by a peculiar dexterity, which can only be acquired by prafilice. By this motion in the water the lighter particles are gradually thrown out of the vef¬ fel, and fcarcely any thing remains behind but the gold, which is either amalgamated or fufed with the addition ol a little nitre, in an earthen crucible. Here it may be added, that the feparation of the gold which is found in alluvial foil, or in the fands of rivers, is conducted precifely in the fame way, only that it is not neceffary to be 1’ubjecled to the proceis of {lamping previous to waffling. The produce of the proper auriferous ores is feldom of fufficient value to admit of the fame attention in waffling as native gold ; and therefore it is always found, after this operation, mixed with a confiderabie proportion of earthy matters. When the metallic part is compofed of pyrites, which is frequently the cafe, it may be ufeful, previous to the fufion of the ore, to give it a moderate roailing, for the purpofe of expelling the greater part of the fulphur} but it muff be obierved, that this procefs is to be regulated by the quantity, and refraflory nature of the flony part ot the ere ; becaule the fulphur in the fubfequent fufion acts the part of a flux, and therefore the cleaner the ore, the more perfect¬ ly it may be roaffed. This part of the procefs being completed, a little quicklime, as a flux, is added, and carefully mixed with the ore, and a portion of galena, according to the proportion of gold and filver contained in the pyrites, previoufly difeovered by affaying it. This mixture is next to be introduced into a reverbera¬ tory furnace, which is to be raifed to a red heat } and when the mixture begins to clot together, it is to be flirred from time to time, and kept at a temperature in¬ ferior to that of fufion, till part of the fulphur is ex¬ pelled ; and when this is accomplifhed, the fire is to be increafed, fo that the whole may be brought to a Hate of thin fufion, after which it is let out in the ufual way, and received in a mould of fand. During the proceis of fufion, the iron having a very ftrong affinity for ful¬ phur, recombines with that portion of which it had been deprived by the roafting, in confequence of the decom- pofition of the fulphurets of lead and copper with which it is mixed ; and thefe metals, by their fpecific gravity, fall in drops through the vitreous ferruginous fcorise, and carry with them the gold and filver, with which they unite at the bottom into a denfe mafs of metal. Thus it happens that the pig formed in the mould con- fills of two parts, which adhere to each other, but may be eafily feparated by the hammer. The fuperior and the larger portion, is a cellular mafs of fcoria, and the lower is a black, heavy, ccmpaft mafs, containing the gold and filver, along with lead, copper, and a portion of fulphur and iron. It is again broken into pieces, and roafted and fufed once or twice, till the whole of the fulphur and other impurities are feparated, and no¬ thing remains but the metallic fubftances. In the farther treatment of the ores of gold, the ob¬ ject of the refiner is to feparate it from the metallic fub- ffances with which it is alloyed. We fliall now men¬ tion the different methods which are followed in fepa- rating the metals from gold with which it is ufually aL loyed. 1. Separation.. Chap. II. ' ORE Gold. i. Separation of gold from platina.—As platina, like “""'v '' gold itielf, is not fufcepiible of oxidation by expofure to heat and air, it cannot be feparated by the procefs of cupellation ; and piatina having as little affinity for fuL- phur as gold itfelf, that fubtlance, or the fulphurated metals, cannot be fuccefsfully employed for this purpofe. It has been found that mercury combines more readily with gold than with platina, and from the knowledge of this circumftance a method has been deviled ot fepa- rating thei’e metals. When the proportion of platina is lb large, that the mafs is brittle, it mull be reduced to powder in a mortar ; but if it be duclile, it may be re¬ duced to fmall pieces by granulation. A quantity of mercury equal to feven or eight times the weight of the alloy, is then to be heated in an iron crucible, and raifed to the boiling point. The alloy being firil made red hot, is to be dropt in, and the whole kept for half an hour nearly at the fame temperature. The mixture is then emptied into an iron mortar, and being covered with hot water, is to be carefully triturated for fome hours, the water being renerved from time to time. In this way the gold combines with the mercury, and a confiderable proportion of the platina will rife to the furface of the amalgam in the Hate of a black powder, which may be eaiily fcraped off. In this way the alloy is to be purified as much as poffible, and the fuperfluous mercury may be feparated by ftraining through leather, and the amalgam is deprived of the remaining mercury by the procels of diftillation. The gold, which ftill holds a fmall quantity of platina, is, nowT to be melted with three times its weight of fib er •, and the mixture being granulated, is to be parted by means of nitrous acid. It has been found (although it be a lingular cir- cumfiance) that pure platina, or even when mixed with gold, is perfectly infoluble in this acid j but, when com¬ bined with a large proportion of filver, it is readily dif- folved, and the folution is of a dark yellovvifh brown colour; and, therefore, by digefting this triple alloy of gold, platina, and filver, in nitrous acid, the filver and platina are diflblved, and the gold remains behind. But it may be neceflary to alcertain whether the whole of the platina be feparated. This is done by melting a few grains of the gold, after careful walhing, with three times their weight of filver, and treating it as be¬ fore with nitrous acid. If it contain one half per cent, or even a fmaller proportion of platina, the acid will be perceptibly coloured, and this being the cafe, the pro¬ cefs muff be repeated again on the whole mafs. But this is rarely neceffary when the previous trituration with mercury has been carefully performed. By adding to the remaining nitrous folution, a folution of common Cdt, the filver will be precipitated, leaving the platina in the folution. By the following method, which is ftill more compen¬ dious, gold may be feparated from platina. The alloy is diffolved in nitro-muriatic acid, and the gold is preci¬ pitated by means of carbonate of foda, or a large quan- tity or green fulphate of iron, neither of which has the effeft of decompofing the folution of platina. The pre¬ cipitated gold being dried, and mixed with a little bo¬ rax and nitre, is fubjecled to fufion, after which it will be found in a ft ate of perfecl purity. 2. Separation of gold from fiber.—In ores in which the proportion of gold is fmall, the filver may be con¬ veniently feparated by means of fulphur. The alloy is S, &C. firlt melted, and granulated, by pouring it into cold wa¬ ter, which is kept in confiant agitation with a rod or wicker brulh. From an eighth to a fifth of the granu-> lated metal is referved, and the remainder is carefully1 mixed with about ■§■ of its weight of powdered fulphur* which adheres readily to the moift grains. The mix¬ ture is introduced into a covered crucible, and kept for fome time at a gentle heat, that the metal may be com¬ pletely penetrated by the fulphur, after which the heat is increafed till the whole mals is brought into fufion. This fulphuret of filver becomes a tough, vifcous fluid, which retains the particles of gold, and prevents, them from fubfiding. The mafs being kept in fufion for about an hour, that the union of the fulphur and filver may be completed, and any excefs may be burnt off', a third part of the referved filver in grains is to be added, and when it is -melted, is to be ftirred with a wooden, rod, that it may be accurately mixed with the other ma¬ terials, and brought into contact with the gold, with which it immediately enters into combination. Tha fu¬ fion being continued another hour, a fimilar quantity of grained filver is to be added, and after a third hour has elapl'cd, the remaining third is introduced, and treated in the fame manner. The crucible, which is now7 to be kept carefully covered, is to be expofed to a high tem¬ perature for three hours, while the melted mafs is ftirred from the bottom every half hour. At the end of this time the lurface of the mafs, inftead of being dark brown, becomes whitifli as the fulphur efcapes, and fome bright white drops of melted ftlver, about the fize of peafe, make their appearance. The fufed mafs is now to be poured into a greafed cone ; and when it is cold, it will be found to be compofed of a mafs of fulphuret of filver, refting upon a white metallic button, which is nearly equal in weight to the added filver, and contains the whole of the gold that originally exifted in the en¬ tire mals. If it appears that any of the gold remains among the fulphuret of filver, it may be leparated by fufion in an open crucible. By this procefs part of the fulphur is burnt off, and a correfponding quantity of fil¬ ver is reduced to the metallic ftate, which being careful¬ ly mixed with the remainder, and repeatedly ftirred with a piece of ftick, the whole of the gold remaining in the filver, which is ftill fulphurated, will be attrafled 5 and by being poured into a cone, will be collefted at the bottom in a mafs. The filver containing the gold, which is collected in thefe two operations, being melted and granulated, is fubjefted to one or more repetitions of the fame procefs, till the filver that remains is found to contain a fufficient proportion of gold, to render it worth while to proceed to the procefs of parting by means of aquafortis. The whole of the filver may be feparated by means of ful¬ phur •, but when the proportion of gold is confiderable, the fulphuret of filver always takes up a part of it, which cannot again be entirely feparated without re¬ peated fufions ; and therefore, wffien the gold is equal to of the filver, a further purification by means of fulphur, wall fcarcely be found advantageous. An ingenious and economical method of feparating the gold from old gilt filver lace or wire, has been ex- tenfively praftifed in Saxony. This method proceeds on the principle, that the affinity of gold for copper, and of filver for lead, is much greater than the affinity which fubfifts between gold and filver; and it is con- 3 G 2 dueled 420 . ORE , GjId~ dueled in die following manner. The alloyed metal is v —r granulated, and r'^ of it is mixed with £ its weight of litharge, and of fandiver. This is called the precipi¬ tating mixture. The next is mixed with ^ of powder¬ ed fuiphur, and is brought into fulion, which being com¬ plete, as will appear,from the flafhing at the furface, of the precipitating mixture is added at three different times, allowing an interval of live minutes between each time 5 anu the fulion is then continued for ten minutes longer. Part of the fulphurated fflver is taken out with a fmall cru- cxole made red hot, and the remainder being poured in¬ to the melting cone, a quantity of metallic liiver com¬ bined with the greateft part of the gold, fublldes to the bottom. The liilphuret of filver is again melted, and the remaining part of the precipitating mixture is added as at firff, and thus a lecond portion of gold alloyed with fflver is obtained. But as the fulphuret ftill retains a fmall portion of gold, it is to be fufed a third time ; and a precipitating mixture, equal in weight to the for¬ mer, but confiding of an alloy of equal parts of copper and lead, is to be added, and thus a third precipitate of gold holding filver is obtained, and the fulphuret is now de¬ prived of the whole of its gold. The different metallic maffes thus obtained, are melt¬ ed with of lead, then granulated, and treated in the fame way as at firft, with fuiphur and the precipitating mixtures. The fflver thus obtained being rich in gold, is firlt to be granulated, then mixed with of fuiphur, and kept in fufion for about half an hour without any addi¬ tion ; and being poured into a cone, the fulphuret is fepa- rated from the metal, and this laff is treated two or three times more with fuiphur, in a fimilar manner. The me¬ tallic button obtained, which now appears of a yellow colour, is to be melted with one fixteenth of copper, then granulated, and mixed with one fixteenth of ful- - phurj and the mixture being firft gently heated in a covered crucible, and kept in fufion for about a quarter of an hour, is poured into a' cone, at the bottom of which the gold is collefted of a brafs colour, and about eighteen carats fine. The purification is afterwards completed by means of fulphuret of antimony, a pro- cefs which will be afterwards deferibed. 3- Parting operation.—When the proportion of the gold and filver, alloyed together, is fuch, that the for¬ mer is not much lefs than one fixteenth, or greater than one fourth of the whole mafs, the operation of parting may be followed. In this method the gold is feparated from the filver by means of diluted nitric acid, or, as it is termed by manufacturers, aquafortis, which diflblves the filver, and leaves the gold untouched. The button, of gold and filver is prepared for this procefs by flatten¬ ing with the hammer, again heating it red hot, and I lowly cooling to anneal it for the purpofe of increafing its malleability. It is then to be extended into a fmall plate as thin as a wafer, by pafiing it between rollers of poliftied fteel, again heated, but only to rednefs, and laft of all rolled up in the form of a fmall loofe coil or fpi- ral, called a cornet. The annealing is ufeful in allow¬ ing the metal to be rolled up without cracking, and at the fame time the freer aCHon of the acid, in confe- quence of the texture of the metal being fomewhat opened. T. he comet thus prepared is introduced into a pear- farmed matrafs, called a parting-g/ajs, and three or four times its weight of pure nitric acid of 1.25 fpecific gravity are added 5 the mouth being ftightly covered to s» &«• • Chap. n. keep out the duft, the glafs is fet on a fund bath, or over Gold, charcoal, to boil. As loon as it becomes warm, the acid ' " y - -J begins to acl on the filver, and diflblves it with the evo¬ lution of nitrous fumes. During the wdiole action of the acid, the cornet appears all over ftudded with mi¬ nute bubbles, and when thefe difeontinue, or run into one another, forming a few large ones, the aClion of the acid is nearly over. The procefs is ufually completed in about fifteen or twenty minutes from the time that the acid begins to boil. 1 he cornet now appears cor¬ roded throughout, and has loft during the folution the wdiole of the liiver ; and the remaining gold which is ffender and brittle, retains the fame fpiral form. Indeed it is of confiderable importance that it fhould not be broken, for much of the accuracy of the operation depends on having the gold in pne piece and not in fragments. The acid folution of filver, while yet hot, is next to be carefully poured olf, and a portion of frefti acid, fomewhat ftronger, is to be added, to feparate ail the re¬ mains of filver 5 the boiling is to be repeated as before, but only for five or fix minutes; it is then poured off and added to the former folution, and the parting-glafs is filled with hot diftilled water, to wafh off the remains of the folution. The cornet, which is now of a brow n co¬ lour and fpongy texture, and has little of the metallic ap¬ pearance, is taken out in the following manner. A fmall crucible is inverted over the mouth of the paffting-glafs, wdiile it is yet filled with the diflilled water, and the latter being rapidly inverted upon the crucible, the cor¬ net falls foftly through the w^ater down the neck of the glafs into the crucible, where it is depofited, and the wa¬ ter is carefully poured off. The crucible after being dried is next heated to rednefs under a muffle. The cornet contracts greatly in all dii'edlicns, becomes of a firm texture, and refumes its metallic luftre 5 and after being brought to a red heat and cooled, it exhibits the appearance of a cornet of pure gold, having all the fplendour, foftnefs, and flexibility of this precious metal. By accurate weighing, the amount of the produft is precifely afeertained, and thus the operation of parting is completed. But if the proportion of gold amount to one third of the mafs, it combines with part of the filver, and pre¬ texts the latter by its infolubility from being aXted on by the acid, fo that in the procefs of parting, too great a proportion of gold in the alloy mult be avoided ; ancT farther, as the acid is expenfive, unlefs the filver be rich in gold, this procefs, wdiich is in many refpects conve¬ nient, will not be found economical. In reducing the finenefs of the alloy which is too rich in gold to be ad- vantageoufly parted by itfelf, it will be the objeXt of the refiner not to employ pure filver, but fuch as contains a fmall portion of gold ; and at the fame time, it will be' his ftudy to fave the quantity of acid. The following is the ufual method of conduXling the’ procefs of parting. After felecling a proper quantity of rich and poor ingots of mixed metal, the wdrole is ter be fufed in an iron crucible ; and being w^ell mixed by frequent ftirring, it is to be removed by a clean iron la¬ dle, and granulated in cold w'ater. The parting glaffes, which are nearly of the form of a truncated cone with a rounded bottom, are about twelve inches high and fe- ven inches wide at the lower extremity, and they fhould be of equal thicknefs, well annealed, and free from any kind of flaws. About forty ounces, of metal are intro¬ duced into each glafs, and the nitrous acid, half fatura- Chap. II. ORE Gold. ted with filver, is added till it ftand two or three fingers •' breadth above the furface oi the metal. Twenty or even more of thefe glaffes are placed in a fand bath, and the heat, which Ihould at fir It be moderate, is gra¬ dually increafed till it nearly reach the boiling point about the time that the acid is faturated. The nitrate of filver is poured off, a new portion of flronger acid is added, and boiled as before till it is nearly faturated, when almoll: the whole of the filver is taken up, and what remains undififolved has the appearance of a brown mud, and confifts of the gold finely divided with a fmall portion of filver. The acid again faturated is poured off, and a third portion of Hill ftronger acid is added, which is kept at the boiling temperature till the evolu¬ tion of nitrous gas ceafes, and the bubbles are enlarged, which (hews that all the filver is taken up. The acid is then decanted off, and referved for the firft part of a future procefs of the fame kind } and the gold is repeat- ly walked with frefh portions of hot wrater till the walkings dropped on a poliflied copper plate produce no {tain ; and the pov/der, being dried and mixed with a little nitre and borax, is fufed, and is then in a ftate of purity. To decompofe the nitrate of filver with the view’ of procuring the pure metal, the folution is poured into a wooden veffel lined with copper, and in which are pla¬ ced plates of copper that the filver may be precipitated from its folution in confequence of the greater affinity of the nitrous acid for the copper. The furface of the plates is to be cleared from time to time of the filver cruft, that a frefh furface of copper may be expofed to the action of the acid, and the decompofition of the ni¬ trate of filver may be promoted ; after which the ni¬ trate of copper formed in the folution is decanted off, the plates are fcraped, and the filver being waftied is fufed with nitre, and is alfo obtained in a ftate of pu¬ rity. 4. Separation of gold from fiver or other metals by fulpjiuret of antimony.—All the common metals, ex¬ cepting zinc, w’hich come under the denomination of imperfect metals, may be feparated from gold by this • procefs 5 for as gold is incapable of combining with ful- phur, and as the affinity of almoft all the other metals for fulphur is ftronger than that of antimony, it is fuffi- ciently obvious, that an alloy of gold with any of thefe metals, as for inftance gold and copper, being added to fulphuret of antimony, the fulphur will combine with the copper, and the antimony wall form an alloy wath the gold. When common crucibles are employed for this procefs, fome previous preparation is neceffary. A well burned crucible is felefted, and foaked for two or three days in linfeed oil, which is then to be cleared away from the inner furface till fome finely powdered glafs of borax dulled upon it ftiall juft adhere, when it is to be put into a dry place for twro or three weeks, af¬ ter which it is fit for ufe. The gold alloy is firft melted in the crucible, and then about twice its weight of coarlely-powalered fulphuret of antimony is thrown in at two or three different times. At each addition the mixture froths and fw-ells up, fo that the crucible muft be larger than the quantity con¬ tained, and great caution muft be obferved to prevent any bits of charcoal dropping into the crucible; for then the mafs of melted matter would certainly flow over. When the mixture begins to fparkle on the furface, S, • See. 421 and appears to be perfectly fluid, it is to be poured into Gold, a melting cone which has been previoully heated and v greafed, and the fettling of the gold at the bottom is promoted by communicating a tremulous ’motion to the cone by means of flight blows. When the matter has become cold, it is removed from the cone by giving it a few blows in an inverted pofition. The mafs is com- pofed of an alloy of gold and antimony covered with fcoriae confifting of the metal formerly alloyed with the gold now in combination with the fulphur or the anti¬ mony. But the gold ftill retains a little of its alloy, and from this it is to be freed *, the fame prccefs is to be repeated not only a fecond, but even a third and fourth time, with a fimilar quantity of fulphuret of antimony. The metals from which gold may be advantageoufty purified by this procefs are iron, copper, tin, lead, and filver. s. Separation of goldfrom antimony.—When the pro¬ portion of antimony exceeds that of the gold, the alloy is brittle. It muft .be reduced to fmall pieces, mixed with one-fourth its weight of fulphur, melted in a cover¬ ed earthen crucible, and after the fufion is completed, poured into a melting cone previouily heated and greai- ed. When examined after being cooled, it will be found to confift of twro parts, which may be eafily fe¬ parated by melting the alloy, expofing it to a high tem¬ perature, and at the fame time direfting a ilream of air from a pair of bellows into the crucible which contains it. By this means the antimony is oxidated, and driven off in the form of white vapour. The gold having ac¬ quired a clear bright green colour, it is to be poured out and melted again in a fmalier crucible with a little nitre. The remaining portions of antimoiry will be oxi¬ dated, and driven off from the gold as before. The fmall proportion of gold which remains attached to the fulphuret of antimony, may be feparated by bringing the whole mafs into thin fufion, and precipitating part of the antimony by adding about one-fifth of its weight of iron filings. In this way the gold falls down in the form of alloy with the antimony, and it may be feparat¬ ed by means of the procefs deferibed above. Separation of gold from lead by cupellation.—This is the moft economical method of feparating gold from lead. The nature of the procefs of cupellation, and the method of conducliqg it, have been already deferibed under Chemistry, N0 2026. p. 682. But befides lead, other metals may be feparated from gold, by employing that metal as a flux, the effefls of which in {corifying and carrying down moft of the imperfefl metals, are fuch, that by the procefs of cupellation with lead, which is to be repeated according to the proportion of the alloy, and its affinity for the gold, almoft every particle of the metals combined with it, maybe feparated. This method .is ufually followed where the proportion of alloy is but fmall •> but when it is more confiderable, :ome of the other methods are preferable. Itis found, however, that in the cupellation oBpure gold with lead, it always retains a fmall portion of this metal, which affects its colour and dutlility. But if the alloy to be purified, contain, befide lead, to the amount of one-twenty-fourth of the gold of copper, the whole of the lead may be feparated, but fcarcely any of-the copper; and if it contain filver in a greater proportion than that of cop¬ per, the latter may be feparated by the procefs of cupel¬ lation, and a little of the lead remains. But if the filver exceed O R E exceed the gold, or be equal to it, the copper and lead may be entirely feparated, while the gold and lilver re¬ main behind. From a knowledge of thefe facts, the re¬ finers, in feparating the bafe metals from gold,, by the procefs of cupellation, add to the mixture a'confiderable proportion of filver. When the gold is alloyed with tin, cupellation with lead alone will not fucceed, be- caufe the tin, writh part of the lead, forms a Ipongy and refractory oxide, and floats on the furface of the fluid metal, and at the lame time retains part of the gold. But as iron is found to combine with tin into an alloy that may be icorified by lead, the addition of iron filings during the procefs removes the difficulty. I he following table thews the quantity of gold which is got from the different countries of the old and new world, taken on an average, between the years 1700 and 1802. Old Contineht. Kilogrammes. Siberia, Africa, Hungary, Saltzburg, Norway, I otal of the Old Continent, 4000 New Continent. North America, !30o South America— Spanilh poffeffions, Portuguefe poffeffions, Total of the New Continent, *■ Brongni- flrt, ii. 351. 13800 17800 S> &c- Chap. m. takes place j then bod the liquor, and feparate the pre- Mercury, cipitate by filtration, dhe muriatic precipitate is next '"“""v —"llJ to be digeiled in nitro-muriatic acicf moderately diluted, which takes up every thing excepting the muriate of filver, from which, after being wafhed and dried, the proportion of filver in the ore may be eafily al'certained. The nitro-muriatic folution is now to be decompoled at a boiling heat, by a. carbonated alkali, and the white precipitate thus obtained being added to tlie former car¬ bonated precipitate, mix them with a little oil, or what anfwers better, fugar, and diftill in a fmall coaled glafs retort. Raife it gradually to a red heat, and ccntinue at that temperature while any mercury comes over. The refidue in the retort confifts of a little metallic bifmuth and charcoal. Native amalgam.—With the view of afeertaining the proportion of mercury and filver in this ore, Klaproth examined fome of the garnet-like cryftals from the quickfilver mines of Deux Pouts. Some pure cryftals weighing 33-f grains were introduced into a barometer tube of a larger diameter than ufual, and clofed at the lower end. This end was placed in fand, within a fmall cruciole} heat was applied, and its intenfity gradually increafed to the degree of ignition. After cooling, he cut off the lower end from the tube, and found that it contained the filver, which had undergone ignition in its former cryftalline form, and weighing 12 grains. On colleaing the mercury which had been fublimed in the tube, he obtained 21 grains. Therefore fince the deficiency of one-third ot a grain may be reckoned as a lofs of quickfilver, the following ^vill be the proportion of the parts in 100 of this cryftallized amalgam of filver. 0 The kilograftime being equal to 2lbs. 30Z. jdrs. avoirdupois, the whole amount is equal to about 39,285 pounds Avoirdupois. Chap. III. Of the Ores of Mercury. The ores of mercury prefent lefs variety than thofe of many other metals; and on account of its peculiar properties, the management of its ores, whether for the purpofes of analyfis or reduction, is lefs complicated and difficult. Sect. I. Of the Analysis of the Ores of Mercury. T o analyze the ore of native mercury, or native amalgam, it is to be digefted in nitric acid of moderate ftrength ; the mercury and filver, and bifmuth, will be diffolved, and if the ore fhould contain a minute portion of gold, it will remain untouched in the form of a brown powder at the bottom of the folution. The ni¬ trous folution is next to be gently evaporated till it is fo far concentrated as to be on the point of cryftallizing. It is then to be poured into a large quantity of pure wa¬ ter, by which means the moft part of the bifmuth will be feparated, and a folution of common fait, or ahy other neutral muriate, being added to the filtered liquor, the filver and mercury will be precipitated in the form of muriate. After this is feparated, add to the clear liquor fome caibonsted alkali, while any precipitation Silver, Mercury, 64 100 Cinnabar.—The analyfis of cinnabar may be conduc¬ ed in the following manner. The ore being reduced to a fine powder, is repeatedly digefted in a mixture of 1 part of nitric acid, and 3 of muriatic, moderately di¬ luted, by which every thing in the ore is diffolved ex¬ cepting ^ the filiceous earth and the fulphur. The re¬ fidue being waflied, dried, and weighed, is fubjeCed to a red heat, and the remaining filex being deduCed, the difference of weight (hews the amount of the fulphur. The nitro-muriatic folution is next to be decompofed at a boiling heat, by carbonated alkali, and the precipi¬ tate obtained being mixed with a little lamp-black, and diitilled, the mercury paffes over in the metallic form. The refidue in the retort confifts of magnetic oxide of iron, and any accidental earth excepting filex that is contained in the ore, together with a little charcoal, which may be feparated in the ufual way. Hepatic ores.—The hepatic ores of mercury, and fuch as contain bituminous fubftances, may be treated in the fame way 5 but thefe ores are fometimes combined with a little filver, and therefore the matter which remains undifiolved in nitro-munatic acid, may be muriate of filver, as well as fulphur and filex. When the fulphur is burnt off, the refidue is to be mixed with twice its weight of pearl-afh, and being ftrongly ignited in an earthen crucible, diluted muriatic acid is added, by which the alkali and the earth will be taken up, and the Chap. III. ORE Mercury, the lilver will remain behind in the form of fmall me- ' tallic grains. Corneous ore of mercury.—To analyze this fpecies of mercurial ore, let it be digefted in a little dittilled vi¬ negar, by which the native mercury which is difperfed though the ore will be left behind. Add to the clear fblutien nitrate of barytes, by which the fulphuric acid will be feparated in the Hate of fulphate of barytes; and this being removed, drop in nitrate of filver, by which the muriatic acid will be feparated in the form of muriate of filver. The mercury now remains in folutipn in the Hate of nitrate, and being precipitated by means of iron, it is afterwards walhed in muriatic acid, and thus appears in the metallic ftate< It may alfo be re¬ duced to the metallic Hate by precipitating by carbon¬ ated alkali, and diftilling the precipitate with a little lamp black. A fimple and eafy procefs is followed in a (laying the ore of mercury in the dry way. The ore to be examin¬ ed is fir ft to be reduced to powder, and carefully mixed with one-fourth of its weight of quicklime, and an equal portion of iron filings. It is then to be expofed to a red heat in an iron or earthen retort, as long as any mer¬ cury pafles over into the receiver. , » Sect. II. Of the Reduction of the Ores of Mercury. A very fimple procefs is followed for reducing the ores of mercury. The following is the method prac- tifed at the celebrated mines of Almaden in Spain. The pieces of pure cinnabar are firft felecled and fepa¬ rated from the ore, to be fold to painters and manufac¬ turers of fealing-wax. The reft is forted into three parts, of which the firft is the richeft, and is broken in¬ to pieces of a moderate fize ; the fecond, containing a fmaller proportion of metal, is broken into fmaller pieces ; and the third confitts of the duft and fmaller fragments of the other two. Thefe are kneaded up with clay, and being formed into bricks, are carefully dried in the fun. The furnace which is ufed - for ex- t rafting the mercury is built in an oblong form, and is divided horizontally by an iron grate, into an upper and lower compartment, and near its top it communi¬ cates with a feries of aludels. In charging the furnace, a ftratum of ftat rough ftones is placed on the grate, intervals between each of the ftones being left for the paflage of the fire. A bed of ore of the fecond quality is laid on the ftratum of ftones, and then a ftratum of the ore of the firft quality, after which another of the fecond kind, and laft of all a ftratum of the third kind, which has been made up into bricks. A few faggots are then thrown into the lower cavity of the furnace, and lighted up; and a gentle fire is to be kept up by oc- cafionally adding faggots for eight or twelve hours, ac¬ cording to the previous ftate of the ore with regard to moifture. After the moifture is feparated, which is known by the vapour ceafing to be exhaled, the fire¬ place is filled again with faggots, and by the time they are confumed, a fufficient heat will be communicated to the ore, to allow the combuftion to go on, by means of the fulphur which it contains, without re¬ quiring any more fuel. In the courfe of the next two days, -while the fulphur burns (lowly away, the mercury rifes in the ftate of vapour, and pafles into the aludels, \vbcre it is condenfed. . When the whole of the metal S, &c. 425 is extrafted, the fcoria is taken out of the furnace, and the Mercury, aludels are emptied of their contents. But beiides the _v J mercury, they are found to contain a quantity of black matter like foot. This matter is eafily feparated by fpreading the whole about on an inclined table, fo that the mercury may run to the lower extremity, where it is collefted in a channel, and the impure footy matter remains behind. The method of extrafting mercury from its ores now deferibed, is advantageous, on account of the flmplicity of the apparatus, and the fmaller expence of fuel •, but • it would appear that a portion of the mercury remaining in the ore is loft. There is betides a confiderable lols in throwing away the foot, after (eparating the running mercury on the tables, not only becaule many of the globules of the metal itfelf are thrown away, but alfo the calomel, and cinnabar, which are found to be in conflderable proportion, are wafted. Hence it has been recommended as a more profitable method, i. To fe- parate the fulphate of ammonia, which, according to the examination of Prouft, forms part of the matter depo- fited in the alude’s, and then by mixing what remains, with 12 or 15 percent, of quicklime, diftill it in an iron retort, by which means the whole-of the running mer¬ cury would be obtained, as well as that which is pro¬ duced by the decompofition of the calomel and cinna¬ bar. A more Improved procefs is praftifed at the mines of Deux Fonts, and Idria. The ore, as it is brought out of the mine, is carefully forted by the hand, and thefe parts that feem deftitute of metal, are rejefted. This procefs, although tedious and expenfive, is found to be more advantageous than the older method of feparating the cinnabar by wafhing, in which there is a great lois of metal. The ore being thus (orted, it is reduced to powder, and accurately mixed with one-fifth of quick¬ lime, which has fallen to powder by expofing it to the air *, but it ought to be obferved that the quantity of quicklime Is to be regulated by the proportion of cinnabar contained in the ore. The mixture being thus prepared, is introduced into iron retorts, which are capable of holding about 6olbs. weight. The retorts to the num¬ ber of 40 or 50, are fixed in a long furnace, and a glais receiver is attached to each, but it is not luted. A moderate heat is then applied for the purpofe of driving off the whole of the moifture 5 and when this- is done, the joinings of the veffels are to be clofely ftopt with tempered clay, and a full red heat is to be applied, and continued for feven or eight hours, at the end of which time the whole of the mercury will be volatilized, and condenfed in the receiver. By this procefs it is found, that loclbs of the ore yield from 6oz. to iooz. of metal. Chap. IV. Of the Ores of Silver. The ores of filver prefent a confiderable variety. Sometimes it is found in the metallic ftate in maffes of from 3olbs. to qolbs. weight, but it is oftener combined with fulphur in the ftate of fulphuret j with other me¬ tals, efpecially antimony, arfenic, iron, copper, lead, and bifinuth *, or with acids, as the carbonic and the muria¬ tic, forming the carbonate and muriate of filver. The analyfis and reduftion of thefe different ores, it is fcarce- ly neceffary to obferve, muff be condufted according to ‘ the - 4H - , : ORE , ■:>llvLri the nature and proportion of the ingredients which en- ter into the compofi lion of the ore to be examined or re¬ duced. Sect. I. Of the Anahjsis of the Ores of Silver. When a filver ore is to be examined, and the only objeft in view is to afcertain the proportion of filver it contains, the operation is ufually conduced in the dry way. The ore is firft roafted and reduced to powder; it is then mixed with litharge in proportion to the earthy mater combined with the ore, and quickly vitrified. The mafs thus obtained is again reduced to powder, and being mixed with black flux, is to be fufed in a cruci¬ ble, with a fufficient degree of heat. By this procefs the lead of the litharge is revived, and collefted at the bottom of the crucible, carrying with it the whole of the filver, as well as fome of the other metals which may be combined with the ore. The button thus ob¬ tained is to be fubjeded to the procefs of cupellation, with the requifite quantity of pure lead, and in this way the bafe metals are fcorified, and the filver remains be¬ hind in a ftate of purity, or combined only with the gold, which many of the ores of filver contain in fmall proportion. The gold is to be feparated by fonre of the methods which we have already defcribed, in treating of the ores of gold. This operation, in which the ob- jed only is to afcertain, as in this cafe, the quantity of filver, is called ajfaymg. In the examination of ores in this view, more a flays than one fhould always be per¬ formed, that an accurate and nearly invariable refult may be obtained. But in examining metallic ores, it is always more fatisfadory to afcertain the whole of the ingredients of which they are compofed. We fhall therefore proceed to give an account of the beft conduded analyfis of the ores of filver. Corneous fiver ore.—The following is the analyfis of this ore by Klaproth. “ Upon 200 grains of the corneous filver ore I poured three times their weight of pure nitric acid j but no adion took place, either in the cold or in the heat of boiling; only a fubtle brown red iron-ochre was fepa¬ rated, -which, being wafhed off from the remaining ore, and dried, amounted to four grains. Cauftic ammonia, added to the nitric acid employed, precipitated five grains more of iron. When it was' afterwards mixed with muriatic acid, only a pale milky colour was pro¬ duced, but no real corneous filver ore depofited. It followed from this, that neither any free native filver, nor any portion of it mineralized by fulphur, had been contained in that ore. The horn-filver, after treat¬ ment with nitric acid, was reduced by twee its weight of fait of tartar, and yielded 133 grains of reguline filver. “ 1. For the purpofe of finding out, more accurately, its conftituent parts, I mixed 200 grains with 600 grains of the pureft alkali prepared from tartar, and brought the mixture into the ftate of fufion in a glafs retort, ap- plying the neceffary degree of heat. After refrigera¬ tion, I broke off the upper half of the retort, foftened the fufed mafs, which was of a light-brown colour, with hot diftilled water, filtered the whole, and edulcorated the-refidue. “ 2. This refidue was then diffolved in nitric acid. The f 2 t §, * 'Chap. IV. folution acquired a brown tinge, and the feum floating Silver, upon the liquor aflumed the colour of bricks. WTen 1 J the argenteGus parts were completely diffolved, there remained 8h grains of a brown-red powder, which im¬ parted a golden yellow colour to the aqua regia, with which it was digefted, and left ra white refidue behind. This laft confifted of horn-filver, mingled with a flight portion of the gangue, or matrix of the ore, and afford¬ ed, on reduftion, two grains more of filver. Cauftic ammonia precipitated from the yellow folution feven grains of oxyded iron. “ 3. The nitric folution of the filver was precipitated by common fait*, and the muriat of filver thus obtained weighed, after redudtion by means of foda, 134! grains of reguline filver. “ 4- The fluid, left after the feparation of the horn- filver, had a pale-yellow colour, owing to a portion of iron; which, precipitated by pure ammonia, weighed five grains. “ 5. After this, I proceeded to examine the faline mafs, diffolved in diftilled w7ater, and fepara'ted from the filver, after the corneous-ore had been fufed with pure alkali. On faturating this mafs with diftilled vinegar, the folu¬ tion was rendered turbid, and a loofe white earth de¬ pofited, which, collefted and dried, amounted to three grains and a half of argillaceous earth. “ 6. The alumina being feparated, the folution wTas re¬ duced to a dry fait by evaporation, and the alkohol, affufed upon it, took up the acetite of pot-afti. The neutral fait, which was left behind by this procefs, and which confifted of the mineralizing muriatic acid and the alkali employed, I diffolved in water, and obtained from it, by repeated evaporation and cryftallization, 117! grains of muriat of potafii. “ 7. In order to learn whether and in what proportion fulphuric acid, which by fome -writers has been mention¬ ed as one of the conftituent parts of the corneous filver ore, were really prefent in it, I again diffclved that fait in diftilled water, and dropped into it liquid muriat of barytes. The mixture became turbid, exhibiting that appearance which indicates the prefence of only a flight quantity of fulphuric acid. I continued to add the barytes, until no more turbidnefs appeared. The weight of the precipitate thus obtained was three grains: but, as in thefe three grains of fulpirated barytes the acid cannot properly be eftimated to be more than half a grain, I think this quantity is too trifling to be confider- ed as one of the effential conftituent parts of the corne¬ ous filver ore. But if that half grain of fulphuric acid be eftimated equal to x-^ [grain of fulphur of potath, and be fubtradled from the above 1174- grains of digef- tive fait, or muriat of potaftr, there will remain of the latter only 116 grains, in which the concentrated muri¬ atic acid amounts to 42 grains. Therefore, “ One hundred parts of this corneous ore contain Silver, 67-75 Muriatic acid, 21 Oxide of iron, 6 Alumina, 1.75 Sulphuric acid, 0.25 96.75.” Redfilver ore.—The following is the malyfis of this ore, alfo by Klaproth. , “ Upon Chap. IV. ORE Silver. “ Upon 500 grains of bright, cryftalKne, red filver-ore, moil finely pulverized, I poured fix times their quantity of a mixture of equal parts of nitric acid of 1.3 50 fpe- cific gravity and diftilled water. The phial was kept for feveral hour# in a low digeftlng heat, lb that the agency of the acid could be but moderate. I then di¬ luted the folution with water \ caufed it to boil; and, alter the refiduum had fubfided to the bottom, I decant¬ ed the clear folution. Upon the remaining pulverulent ore, a quantity of nitric acid and water, equal to the preceding, was again aitufed 5 and, in the fame manner, proceeded with as at firft. The ore appeared now to have been effectually decompofed; and for this reafon the felutions, together with the refiduum, were put on the filter, and the latter properly walhed. “ The filtered nitric folution had no colour at all, ha¬ ving been very much diluted by the water by which the refidue had been edulcorated. I lubjected it to evapo¬ ration to -g-th part, and found the bottom of the evapo¬ rating glafs veffel, after cooling, covered with copious, finely grained, refplendent, and heavy cryftals of a gray white. To afcertain their nature, I procured, by a feparate procefs, a quantity of a folution of the fame red filver-ore, fufficient for this enquiry, and found that they were fulphate of filver. Being affared of this, I diifoived that fulphate by a proportionate quantity of water, affilled by heat, added it again to the nitric fo¬ lution, and combined this laft with muriatic acid, as l©ng as any muriate oh filver wrould precipitate •, wdiich, when collected, edulcorated, and dried, was found to weigh 39ti grains. “ The fluid, from rvhich the hom-filver had been thus feparated, was then reduced to a fc* Her bulk, by dif- tillation from a retort. This concentrated fluid became turbid, and left another grain of muriated filver on the filter. At this time it contained no other foreign fub- itance, except a confiderable portion of fulphuric acid. “ What remained undiflblved by the nitric acid, con- fifted of an afli-gray, pretty loofe, or flocculent powder, of 20 2 grains irr weight. When this had been gently di- gefted for half an hour, with a mixture of five parts of muriatic acid, mixed with one part of the nitric, and then diluted with half its quantity of water, there re¬ mained, after filtering, careful edulcoration, and drying, 65 grains which were the fulphureous contents of the ore. When this refidue had been gently heated, the fulphur deflagrated, leaving 6b grains of muriated filver behind. This fulphur, therefore, confifted of 58b grains. “ After the filtered folution had been evaporated in part, it was poured into a large quantity of water. By management, a white precipitate immediately enfued, wdiich being feparated by the filter, edulcorated, and dried, and laftly heated in a porcelain cup, gave 133 grains in weight. But I could not find the leafl: trace of arfenic in it, though I had fiibiefted it to all the trials 'deemed proper for difcovering its prefence. On the -contrary, it was manifeft, that this precipitate wholly confifted of oxide of antimony, quite of the fame nature with that which is produced when muriatic folutions of antimony are precipitated by water On expofing it to heat, a fmall portion of moifture ftil) evaporated, attend¬ ed with a muriatic fmell, which was hardly perceptible. When again put on a teft, and mingled with a third part of charcoal duft, the coaly powi r wTas flowdy con- fumed, by burning, without any aricnical fmell, and left Vol. XV. Part II, S, &c. 425 behind it the metallic oxide, poffcffed of a gray colour, Silver, and partly blended, partly covered with a quantity of ——-v——' fine, gray-white, ftiining, acicular cryftals, or the flowers of antimony, as they are called. But when it was fufed in a covered crucible with tartar and powdered charcoal, it was completely revived into reguline antimony, which being blown off with the bellows, a bead of filver was left, weighing half a grain. “ The liquor alfo, from which the antimonial oxide was feparated, contained free fulphuric acid. On this ac¬ count 1 put it into a retort, together with the nitric acid, from which the filver had been precipitated in the ftate of horn-filver, by means of muriatic acid, and con¬ tinued the diilillation until, at this temperature, nothing more would pals over} but, on railing the heat, thick white vapours had begun to rife. The fluid left behind in the retort was found, upon trial, to be concentrated fulphuric acid. Upon diluting this laft with wrater, and fubfequent affufion of muriated barytes, the fulphate of barytes from thence produced, amounted, after edulcora¬ tion and deficcation, to 194 grains. “ Confequently, the conftituent parts difeovered by thefe refearches, are, filver, antimony, fulphur, and ful¬ phuric acid ^ ^ * Effays. ] Vitreous Jllver ore.—This has been alfo analyzed by Klaproth, according to the following method. “ 1. If dudlile vitreous filver ore be fufed upon a piece of charcoal, by the afliftance of the blow^-pipe, its ful¬ phur is quickly volatilized, and a button of pure filver remains. But it is otherwife with the brittle ore : for the bead left after the evaporation of the fulphur is brittle, and cannot be purified by the addition of borax. Howrever, if a little nitrate of potafh be added to the red- hot bead, it will deftroy the portion of bafer metal which it contains, and then the borate of foda caufes it to yield a pure button of filver. “ 2. One hundred grains of ore, previoufly levigated, ivere gently boiled in a lufficient quantity of nitric acid, diluted with an equal quantity of water. This opera¬ tion was repeatedly performed, till the black colour of the powdered ore difappeared, and the infoluble portion had become of a loofe texture, and had acquired a gray- yellow colour. When filtered and dried, this refidue weighed 26 grains. “ 3. On adding a folution of common fait to the above filtered folution, which had affumed a pale-greenifh colour, a copious precipitate of horn filver enfued, which, edulcorated and dried, gave 88^ grains. Four parts of this afforded three of filver, by fufion with foda. “ 4. The remaining folution was next combined with fulphate of foda •, but neither any turbidnefs, nor any in¬ dication of the prefence of lead, appeared. Upon this, cauftic ammonia was affufed to excefs $ and the gray precipitate, which then fell down, and which the vola¬ tile alkali could not again render foluble, weighed five grains. Urged by heat, it melted into a confiftence like pap, at the fame time that a weak arfenical fmell was perceived. After this precipitate had been once more diffolved in nitric acid, the addition of foda caufed it to yield a whitifh yellow, alkaline fulphuret a dirty brown, and Pruflian alkali a deep blue precipitate, liable to the attraction of the loadftone, after ignition. Therefore, it confifted of iron, with a flight trace of ar¬ fenic. 3h 5. The C/! K) 6 ORES, &c. ilver. 1 EJays. “ 5. The proportion bf copper, indicated by a blue colour, in confequence of the addition of ammonia, and which llill remained in the folution, was but flight. For, after the folution had been faturated with Mphuric acid, poliihed iron immerfed in it, was inverted with fo flight a coppery cruft, that no copper to any amount could be colledted. / “ 6. Thofe 26 grains, which continued infoluble in the nitric acid (2.), were digefted in nitro-muriatic acid, till nothing appeared to remain but the mere fulphur. Its weight amounted to 13 grains-, but, after deflagra¬ tion, it left behind it about one grain of quartzofe matter of the mine. “ 7- From this it is obvious, that 13 grains, or one-half ot the above 26 grains, were held in folution by the ni¬ tro-muriatic acid ; and thefe were precipitated entirely in the form of a white powder, upon the affurton of 20 parts of water. When ignited, this precipitate affumed a yellowifti colour ; but there was nothing, either of arfenic, or any other volatile fubftance, perceivable. By combination with foda, it became reduced to pure regu- line antimony ; which, as fuch, admitted of being blown off without leaving any reiidue, in its ufual form of a thick white fmoke, adhering to the contiguous bodies in the form of needle-fhaped flowers (oxide) of anti¬ mony. Thofe 13 grains of oxided antimony are equi¬ valent to ten grains of that matter in the reguline ftate For the analyfis of fome of the other ores of fiver, we muft refer our readers to the ingenious and elaborate Eflays of the fagacious Klaproth, from which we have extracted what is given above on this fubject. Sect. II. ReduElion of the Ores of Silver. Although the ores of fiver contain a larger pro¬ portion of extraneous matters than the ores of fome other metals, the value of that metal being greater than that of many others, admits of greater expence in the procefles employed for their reduction. The ores of fiver are reduced, either by fufion, or amalgamation. ReduBion of fiver ores by yh/fo/z.—Native fulphuret of lead, or galena, commonly contains a portion of fi¬ ver, and often in fuch quantity, as to make its fepara- tion from the lead a profitable undertaking. The pro¬ portion of fiver contained in lead is very variable. The greateft produce of fiver which we have heard of, was got from the lead ore of Craven in Yorkfhire, which amounted to 230 ounces of fiver in the ton of lead. The mines of Cardiganflflre yielded formerly 80 ounces per ton ; the Durham and Weftmoreland mines afford lead, from which 17 ounces of fiver are obtained upon an average per ton. The lead procured from the mines of Way, one of the Weftern iflands of Scotland, yielded, we have been informed, 40 ounces per ton; and the a- verage produce of lead at the refinery at Poullaouen, in Brittany in France, is above. 39 ounces of fiver per ton. The following is the procefs carried on at the Tatter ertablilhment, for feparating the fiver from the lead. After the lead has been ex trailed from the ore, the obieert of the refiner is to obtain the fiver in a feparate ftate, which is difperfed through the mafs of lead. This is performed by the procefs of cupellation on a large fcale, or refining, as it is ufually termed. The floor of the reverberatory furnace, in which the procefs is con¬ duced, is horizontal, and it is lined with wood athes and land mixed together, and well beaten, and formed into a ihallow baton, which is the cupel. There is an aperture at one fide of the cupel, which forms a right angle with the flue by which the flame from the fire¬ place paffes into the cavity of the furnace. Through this aperture the lead, brought to the ftate of litharge, runs and oppofte to it there is another aperture by which a blaft of air is admitted. The top of the fur¬ nace has a circular aperture direCly above, and corre- fponds in extent with the cupel, which may be ihut up with a frame work of iron filled with bricks. When the furnace is ready, the cupel is lined with hay, and is then charged with about 177 quintals of lead, in bars or pigs, through the circular aperture, and the cover being put on, the fire is lighted up. In the courfe of fix hours, the whole of the lead being melted, and brought to a red heat, a blaft of air is direCed upon the furface of the lead, and the alhes of the hay, and other impurities are removed with a wooden rake. The blaft: being continued for half an hour and more, the furface of the lead begins to be covered with a thick cruft of oxide, which is feraped off, and is foon fucceeded by another, but it is not till the furface has been cleared five or fix times, that the true litharge appears. When this is the cafe, the temperature is raifed to a cherry red, and by the a&ion of the blaft, with the occafional aid of the workman, the litharge flows put through the aperture mentioned above. The intenfe heat volatilizes a con- fiderable portion of lead, and fo fills the interior of the furnace with vapours, that a perfon of experience only can difeover wh* is going on in the cupel. At the end of 38 or 40 hours from the time that the fire is lighted, the contents of the cupel are reduced to about fix quintals, and the litharge which comes over at this time is kept feparate, becaufe it contains a fmall portion of filver. At laft the litharge ceafes to flow, and the furface of the melted metal appears covered only by a thin pellicle. It then becomes gradually convex at the edges the pellicle breaks up, and the furface of the metal appears quite bright. The blaft is now to be turned off, the fire damped, and an aperture in the fur¬ nace, previoufly flopped with clay, is opened to admit a tin plate tube, through which a ftream of water is poured into the cupel, in order to cool the metal rapid¬ ly, that it may be prevented from fpirting, which would be the cafe, if this precaution were not obferved at the moment of congelation. But the filver thus obtained is ftill contaminated with a portion of lead, from which it is freed by a fecond cupellation, which is performed in a moveable cupel containing about 700 or 800 ounces, and is placed in a fmall reverberatory furnace, which being heated about three hours, is charged with filver of the firft cupellation. After the fufion of the filver, a proper working heat is kept up for four or five hours, when the refining is ufually completed. The lofs of lead by volatilization during the refining procefs is efti- mated at about eight per cent. When the quantity of litharge produced is large, it is reconverted into lead, by being returned into the reverberatory furnace, and treated in the fame manner as the ore. This forms lead of the beft and fofteft quality, becaufe it is in a ftate of the greateft purity. And befides, the fcorias that re¬ main after the redu&ion of the ore, and the litharge, along Chap. IV. Silver. Chap. IV. ORE Silver. along with the old cupels, and the metallic foot which u.i——1 is depofited in the chimney of the furnace, are treated in a common blaft furnace, and a conliderable portion of lead is thus obtained. A different pradlice is followed in the Englilh re¬ fineries.” A common reverberatory furnace, having the area perforated with a large oval hole to' receive the cupel, is employed. The cupel is formed of fix parts of well burnt bone afhes, and one of good fern alhes mixed together, and moiilened to a prope'r conliftence. A quantity of this mixture is brewed to the depth of about two inches in an iron frame, which confifts of a raifed elliptical rim, with five broad bars rivetted to its bottom, fo as to occupy nearly one-half of its area. The allies are rammed down very clofe with a -wooden beat¬ er, and particularly within the bars of the frame, as it is laid on a flat floor. More alhes are then added, and beaten carefully in, till the frame is quite full. By means of a lharp-edged fpade, five inches Iquare, a ca¬ vity is formed in the tell for containing the melted me¬ tal, and at one end of the frame a femi-elliptical hole is cut through the breaft, which latter is to be left of fuf- ficient folidity and thicknefe. The tell is now to be turned on its fide, and drelfed from all fuperfluous allies adhering to the bottom, taking care that none fliall be left flulh with the bottom of the frame or crofs bars, otherwile the tell might be bulged, by fixing it at the bottom of the furnace. The rim being plallered with clay or moiilened alhes, the tell is placed upon the fup- porting crofs bars, and fixed firmly with wedges againll the bottom of the furnace, the breaft being next to the feeding hole. A moderate heat is now applied, and gradually increafed till the tell be red hot; and when it ceafes to emit beam from the under fide^ it is fufficient- ly dry. This previous preparation being completed, the following is the method of operation as it is defcrib- *Nichol. ed by Mr Sadler *. Journ. “ Lead previoufly melted in an iron pot is ladled kxv. 3. into the teb until the hollow part be nearly filled, the operator clofes the feeding aperture, and increafes the heat of the furnace until the furface of the lead is well covered with litharge j he then removes the door from the feeding hole, and with an iron rod, which has one end bent down at right angles about three inches and made flat or chilfel-fliaped, fcrapes the fmall gutter or channel until the litharge jub flows into it, the blab from a pair of double bellows is then directed from the back part over the furface of the tell, the litharge is urged forward, and flows from the gutter upon the floor of the, refinery ; the operation now goes forward, gradually adding lead as the efcape of litharge makes it neceffary, until the gutter is fo worn down that the teb does not contain more than an inch in depth of lead, the blab is then taken off, the gutter filled up with moibened allies, and a frelh one made on the other fide the bread ; the teb is again filled, though not fo full as at firb, and the operation carried on until this gutter alfo is worn down and the teb contain from about 50 to 70 pounds of alloy. This quantity is run into an iron pot, and fet by until a fufficient number of pieces have been collected to make it worth while to take off a plate of pure filver from them. “ The quantity of alloy left in the working off each teb mult depend in a great meafure upon the quan- ' ily of filver which by edimalion it is fuppofed to contain. S, &c. A fufficient quantity of lead Ihould always be left in the alloy to make it fufe eafily in the iron pot. “ When the teb is removed from the furnace and bn> ken up, the litharge will be found to have penetrated to an inconfiderable but an equal depth in the alhes j that part not impregnated with litharge may be pul¬ verized, mixed with frelh abies, and again ufed for ano¬ ther teb. “ The operation of taking off the filver pure differs in no refpect from the foregoing, only more care is ob- ferved in the working, not to fuffer the efcape of any metallic particles with the litharge, as that would oc- cafion confiderable wabe of filver. As the procefs ad¬ vances, and the proportion of filver to lead increafes, the litharge affumes a darker colour, a greater heat be¬ comes neceffary, and at lab the brightning takes place ; the interior of the furnace, wdiich during the whole of the procefs had been very obfeure and miby, clears up. When the operator obferves the furface of the filver to be free from litharge, he removes the blab of the bel¬ low's, and fuffers the furnace to cool gradually *- as the filver cools many protuberances arife on the furface, and fluid filver is ejected from them with confiderable force, which falling again on the plate, fpots it very fantaff ical- ly with fmall globules. “ The latter portions of litharge bring oyer a confider¬ able quantity of filver with them ; this is generally re¬ duced by itfelf and again refined. “ The litharge as it falls upon the floor of the refinery is occafionally removed ; it is in clots at firb, but after a biort time as it cools it falls for the mob part like flaked lime, and appears in the brilliant feales it is met with in commerce : if it is intended as an article for fale, nothing more is neceffary than to lift it from the clots which have not fallen and pack it in barrels. “ If, on the contrary, it is intended to be manufadlured into pure lead, it is placed in a reverberatory furnace, mixed with clean fmall-coal, and expofed to a heat jub fufficient to fufe the litharge. The metal as it is reduced flov/s through an aperture into an iron pot, and is cab into pigs for fale. During the reducing, care is taken to keep the whole furface of the litharge in the furnace Covered with fmall-coal. t; In fome fmelt works, inflead of a reverberatory fur¬ nace for reducing, a blab furnace is made ufe of, on ac¬ count of the greater produce, but the lead fo reduced is never fo pure as that made in the wind furnace. The oxides of the metals, which require a greater heat to re¬ duce than the lead, are in the blab furnace generally re¬ duced with it. “ The volatile oxides, as zinc, antimony, and arfenic, are mobly'carried off by evaporation during refining ; a confiderable portion of the oxide of lead itfelf is carried off by evaporation, making the interior of the furnace fo miby and obfeure that a perfon unufed to refining cannot fee more than a few inches into it. “ A confiderable portion of thefe oxides is driven by the blab of the bellows through the feeding aperture, and would be diffipated in the refining-houfe, to the great injury of the workmen’s healths ; to prevent their ill effefls, the arch or dome over the feeding hole is creeled to carry the fume into the back of the fur¬ nace.” We fhall now deferibe the method of treating the 3 H 2 proper \ 8 O ft E rer< proper ores of filver, as it is conducled by Schreibei' at Allemont in France. 'Ihefe ores are native iiiver, and the'falphuret of filver mixed with arfenical cobalt, py¬ rites, iron ochre, clay, calcareous Ipar, and fome other earthy minerals. The iiiver being difperfed in very minute grains through the gangue, cannot be feparated from the Jlony parts by waihing. After the ore is picked by the hand, it is pounded dry in the damping mill, and is reduced to the coniiilence of coarie land. RoalVna-, previous to fufion is not required j but the ore being re- iracfory, it is found necefl’ary to employ a flux compo- led oi quicklime, fcorise from a preceding fufion, and llag from the iron forges. To fupply the proper quan¬ tity of lead, powdered galena, with the litharge and icon ye furniihed by the refinery, and with old cupels ground to powder, is added to the ore, in fuch propor¬ tions that the lead, which is obtained by the fuiion, may contain twTo jrer cent, of iiiver, allowing 20 per cent, at lead of the lead to be lod by evaporation, or combining with the fcorke. After being properly mix¬ ed, the materials are fubjecfed to the heat of a powerful blad furnace, with alternate charges of charcoal. J he products ot the fufion are lead combined with filver, a black, compact, fulphureous, femi-metallic fubitance which is called matt, and fome fcoriae. The fcoriae thus obtained is neglefted, excepting a certain propor¬ tion, which is referved as a flux for the next parcel of ore. But the matt, which is tolerably rich in filver, is again melted with litharge, and the lead carries with it atmod the whole of the diver ; and although this fecond matt contain a portion of filver, it is not found worth while to fubjeff it to a fecond lufion. After refining the lead procured by tbefe operations, it is found to yield about two per cent, of filver. The procefs of cupella- tion is performed at a higher heat than ufual, which it is fuppofed is neceflary by the preience of a fmall por¬ tion of iron •, but the confequence of employing this high temperature is to increaft the wade of the metal by evapo¬ ration j for indead of feven or eight per cent, it amounts to no lefs than 20 per cent. And as every pound avoir¬ dupois of the lead thus volatilized, contains from bx to ten grains of filver, the lofs in this procefs is very great. Perhaps it might be diminidied by mixing a larger pro¬ portion of lead with the filver ore. But other filver ores afford both lead and copper, and in this cafe a more complicated operation becomes re- quifite. In the fird part of the procefs the poored kinds of filver ore, or fuch as contain but a fmall proportion of copper and lead, and a great deal of dony matter, are to be mixed with the poorer pyritical ores, or fuch as contain little lilver and copper, and a great deal of fulphur and iron. A portion of fcoriae obtained from a former procefs, and containing the oxides of lead and copper, with fome filver, is added to this mixture by way of flux. The materials thus prepared being ex- pofed to heat in a blad furnace, read! on each other, and enter into fufion. The dony matter is diffolved, and the melted mafs feparates into two didinbd parts, of which the heavied occupying the bottom of the furnace, forms about one-fourth of the whole mafs. This is called matt, and contains all the filver, with the greater part of the copper, mod of the lead, iron, and fulphur, and generally zinc and arfenic. The flag which fwims on the furface, as being the lighter portion, confids of The greater part of the fulphur, oxide of iron, and earthy S, &c. Chap. IV. matters ; the fmall proportion of lead and copper is not Silver, worth the trouble of extraction. * ' 1 v To drive off part of the fulphur and other volatile impurities, the crude matt obtained in the preceding operation is roaded, and being mixed with one and a half times its weight of a richer kind of filver ore, and twice its weight of lead fccriae, by way of flux, it is again iufed, and thus a rich matt is procured, which may contain from nine to ten pounds of lead, from thrae to four pounds of copper, and from fix to feven ounces of filver in the quintal, befides a quantity of fcorue which holds a little filver, and which may therefore be fuccefsfully employed as a flux in fubfequent fufions. This rich matt being roafled, is mixed with half its weight of litharge and fcoriae in equal proportions, and again fubje&ed to fufion. The product of this fufion is a quantity of metallic lead, containing from fix to eight ounces of filver in the quintal ; a limilar quantity of cojiper matt, which contains from 30 to 40 pounds of copper, and about four ounces of filver in the quintal \ and laltly a quantity of fcorke, which contains from fix to 10 pounds of lead, and about 40 grains of filver in the quintal. The copper matt of the above operation is next roafl¬ ed, and fufed with a quantity of lead and copper fco- rne, and the product obtained is black copper, which contains from 60 to 80 pounds of copper, and from five to ten ounces of filver in the quintal. This black cop¬ per being melted with litharge and fcorke, the mod part of the filver combines with the lead, and after one or two fufions, the copper is entirely freed, not only from the lead and filver, but alfo from the fulphur, iron, and other impurities. Liquation.—The affinity between lead and filver is much flronger than the affinity between lead and cop¬ per. In confequence of this aflinity, lead and filver are eafily feparated from copper, by being expofed to a mo¬ derate heat. This procefs is called liquation or eliqua- tion. When the black unrefined copper, or copper matt, contains the proper proportion of filver for this opera¬ tion, it is fird fufed with lead or litharge, or with a mixture of the two, and an alloy confiding of copper, lead, and filver, is thus obtained. This is cad into moulds, fo that the metallic produfl ffiall be in the form of round maffes or loaves, which being fet in a furnace on an inclined plane of iron, with a fmall chan¬ nel grooved out, are expofed to a moderate red heat. By this procefs the lead melts, or, as it were, fweats out of the loaf, and carrying the diver along with it, on account of its flronger affinity for this metal, runs down the groove, while the copper remains behind as a dark red fpongy mafs. The lead containing the filver being fubjefted to the procels of cupellation, the latter is obtained feparate. But, in adopting this procefs, the proportion of the three metals mult be attended to. The lead ffiould not be more than four times the weight of the copper, otherwife the alloy becomes fo fufible, that part of the copper will be melted and -carried along with the lead and filver ; or, if too great a degree of heat is applied, the whole loaf of liquation will be fufed, \and The procefs mud again be repeated. The pro¬ portion of lead fhould at lead be 7\ times the quantity of copper, otherwife a confiderable proportion of it, and alfo part of the filver, will remain in the loaf after heat¬ ing. But as this procefs is now more randy followed, we Chap. IV. ORE Siiver. we fh:ill not enter Into any farther detail of the particu- w Y-—..' jars conne£ted with it. ReduEiion of jilver ores by amalgamation.—This pro- cefs, by which lilver ores are reduced, and which is now pretty generally followed, in dift’erent parts of Eu¬ rope, wras firit practifed by the Spaniards in South America. The ores which are fubjected to amalgama¬ tion, are luch as contain only a fmall quantity of lead or copper} but it is of lome imnortance that there fnould be a certain proportion of iron pyrites, and if this proportion be not naturally mixed wTith the ore, it is a good practice to fupply the deficiency, by adding what is wanting to the dreifed ore, fo that the pyritical contents may, as nearly as pofiable, be in a certain pro¬ portion to the quantity of filver, which is to be alcer- tamed by previouily affaying a portion of the ore. The ore being reduced to the conliftence of coarfe fand, is carefully mixed with common fait, in the proportion of eight or nine per cent, wdien the filver in the ore amounts to eight ounces per quintal; and -when the latter amounts to 3 2 ounces, or even a greater pro¬ portion, from 10 to 12 per cent, of fait is to be added. The next p roc eft is roafting the ore, in which about three quintals are fpread on the floor of a reverberatory furnace, and fubjehled to a moderate red heat. During the roalting the ore is to be turned twice or thrice, that every part of it may be equally expofed to the heat. The firfi; charge being withdrawn, an experienced workman knows by its appearance whether the propor¬ tion of fait be too little or too much, and, as may be required, more fait or ore is added to the unroafted par¬ cel. When the whole of the ore is roafted, it is ground in a mill, palled through fieves, by which it is made as fine as meal, and is then prepared for the proper procefs of amalgamation. This is performed in the following manner. A number of fmall barrels, which are made to revolve rapidly on their axes by means of machinery, or fixed tubs, either open or covered, having in the centre of each an inftrument refembling a chocolate mill, which may be turned rapidly by fimilar machi¬ nery. The tubs or barrels are filled about one-third with water, and afterwards a fufficient quantity of roaft- ed ore and mercury, in nearly equal proportions, is in¬ troduced, fo that the whole may be of the confiftence of thin mud. The machinery is put in motion, and continued without interruption for 30 or 48 hours, ac¬ cording to the nature of the ore, when the amalgama¬ tion is completed. About a quarter of an hour after the agitation of the matter in the barrels has ceafed, the greater part of it falls to the bottom, and is withdrawn by opening a hole made for the purpofe. The earthy refidue is carefully walked by fmail portions at a time, and thus a good deal of the amalgam which, from be¬ ing very minutely divided, could not fink through and mix with the reft, is recovered. The earth, however, if originally rich in filver, ftill retains a fmall propor¬ tion. It is therefore dried, and being mixed with about 3 per cent, of fait, is again roafted ; but at a higher temperature than at firft, and the procefs of amalgama¬ tion being again repeated, the whole of the filver is ex¬ tracted. The fluid amalgam is ftrained through a clofe- ly woven bag, and is thus feparated into nearly pure mercury and a ftiff amalgam •, and the latter being fub¬ jected to diftillation, the mercury is driven over, and S, &C. 429 the filver remains behind. The copper, which is com- Sliver, bined with the filver, is feparated by cupellation. '——v The procefs of amalgamation is thus explained. The greater part of the fulphur of the filver and pyrites is, by roafting, burnt off, and converted into falphurous acid, which latter, as loon as it is formed, and alTifted alfo by the affinity of the filver for muriatic acid, de- compofes the common fait, forming a fidphate or ful- phite of foda, vdiile the muriatic acid combining with the filver, forms muriate of filver. In the amalgama¬ tion which follows, the mercury, being in great propor¬ tion, decompofes the muriate of filver, and is partly converted into calomel. Hence it appears, that the lofs of mercury, which is fometimes very confiderable in this procefs, arifes, firft, from the converlion of part of it into calomel j and, fecondly, from the extremely mi¬ nute divifion of another part, fo that it is carried off in waffling the earthy refidue j but the proportion of the latter depends much on management. By the following method filver may be feparated from copper, according to Napione, wdthout the expen- five and complicated procefs of liquation. The mixed metal is melted ; a quantity of fulphur is fprinkled over its furface, while the whole is ftirred about with a flick by an afliftant, fo that the fulphur may combine with the copper into a matt, which floats above the metal, and is to be removed wdth a pair of tongs, previouffy moiftening its furface with wrater, to make it folid. Another portion of fulphur is next to be ftirred in, and the fecond matt produced is to be removed in the fame manner. This procefs being repeated a fufficient num¬ ber of times, the greater part of the copper is converted into matt, holding a fmall proportion of filver, while the remaining copper, which retains the moft of the fil¬ ver, originally diffufed through the whole mafs, be¬ comes rich enough to be lent immediately to the re¬ finery. In treating the matt, it is firft to be reduced to powder, mixed with common fait and quicklime, in the proportion of 12 per cent, of each, roafted for 10 hours, amalgamated as before •, and after three fuccef- five roaftings and amalgamations, the whole of the fil ver may be extracted. TABLE of the quantity of Silver introduced into Com - mercey taken at an average between the years 179Q and 1802. Old Continent. Siberia, Hungary, Auftrian States, Hartz and Heffe, Saxony, Norway, France, Kilogrammes. 20,000 5000 5000 10,000 10,000 5000 New Continent. North America, Spaniffi poffeffions South America, 600,000 ini j- 275,000 Kilogrammes, or about 2,091,162 lbs. avoirdupois. 72,500 875,000 947.5°°. Chain. ORE i 43° Copper. v Chap. V. Of the Ores of Copper. The ores of copper are very various. This metal is found native, in the Hate of oxide, in the date of ful- phure*-, and in that of fait, combined with carbonic, muriatic, phofphoric, and arfenic acids. Sect. I. Of the Analysis of the Ores of Copper. The atialylis of the ores of copper, it is obvious, muft vary, according to the nature of the fubftances with which they are combined } but as a great proportion of the ores of that metal are combined with fulphur or arfenic, when they are to be treated in the dry way, they are firfl roafted, for the purpofe of expelling thofe fubitances. To effeft this, the ore is mixed with about one half its bulk of-charcoal powder, or fine faw-duft, and then fubje&ed to a low red heat, on a flat tile or muffle, on which it fliould be thinly fpread. The ful¬ phur or the arfenic rifes in fumes ; and to accelerate the feparation of thefe fubftances, the mixture fflould be frequently ftirred, obferving at the fame time not to in- creafe the heat to fuch a degree as to make the ore clot together, which is one of the objefts in the ufe of the faw-dufl or charcoal. When it appears that the fumes ceafe to rife, and the whole of the charcoal is burnt off, the part of the ore remaining is now in the date of oxide, but mixed with a quantity of fulphur or arfenic, which cannot be entirely feparated by reading, and with the earthy matters with wThich the ore wras origi¬ nally combined. The next objefl is to reduce the oxides, thus obtain¬ ed, to the metallic date •, and in this procefs of reduc¬ tion the oxide is expofed to a high temperature, in con- la£l with fome carbonaceous matter, and fecluded from the air. It has been a common practice to add fome al¬ kaline matters by way of dux, to promote the fufion of the extraneous matters combined with the ore 5 but the experience and obfervation of more enlightened chemids have proved, that a portion of the metallic oxide is al¬ ways diffolved by faline duxes, fo that by adays in the dry way with faline duxes, a lefs proportion of metal than the ore really contains, is obtained from it. The lofs, according to Klaproth, between the treatment of a cop¬ per ore in the dry way, and the fame ore, in the moid way, amounted to no lefs than 9 per cent. To obviate this inconvenience, a dux is employed by fome, compofed of fudble glafs, into which a large proportion of alkali and dlica enters, without any metallic matter, or duor fpar, lime, and particularly borax. Ey the latter, a thinner fufion of the vitrifying mixture, than by an equal quan¬ tity of any other fubdance, is produced, fo that a fmall- er proportion of borax than of the alkaline matters an- fwers all the purpofes of a dux ; and thus the lofs of the metallic oxide, by dilution, is lefs. But in reducing the pure oxides, or the carbonated oxides of copper, the method wdiich is attended with fcarcely any lofs, is by fub]ceding them in contaed with charcoal, in a covered crucible, to an intenfe heat. It is indeed in this way that the reduction of roaded cop¬ per ores is condufted on a large fcale •, but as thefe lat¬ ter contain fulphur, arfenic, iron, and other impurities, the procefs mud be many times repeated before the cop¬ per is brought to a malleable date. 4 S, &c. Chap. V. In reducing the fulphurated ores of copper, a button Chopper, of metal, of contiderable purity, may be fometimes ob- '-—nr*—^ tained by means of a Angle operation. The tedious procefs of reading is avoided by adding to the ore two or three times its weight of nitre, and projetding it into a hot crucible. When thrown into the crucible, a defla¬ gration takes place, in which the fulphur is burnt, and converted into fulphuric acid, which unites with the potaffl of the decompofed nitre. The metal being now freed from the fulphur, is in a date of complete oxida¬ tion by the nitric acid, and may be reduced by adding a flux of tartar and pitch, or other dmilar matters, and applying a drong heat ibr a fufficient length of time. But it feems to be more advifable to feparate the metal¬ lic oxide after deflagration. This may be done by wafli- ing the mixture, after which the oxide is to be reduced by the proper flux. In the analyfls of copper ores in the moid way, the metal is obtained feparate in three dates 5 either in the metallic date, in the date of black oxide, or in that of green carbonate. If a poliffled piece of iron be intro¬ duced into an acid folution of copper, it is immediately covered with a coating of fflining metallic copper, which is owing to a part of the iron being diflblved by the acid, and a correfponding portion of copper being fepa¬ rated from the folution. The whole of the copper may be precipitated in this wTay, and at lad the folution con¬ tains only iron. The precipitate, which is in the form of ragged filaments, may be waffled, dried, and weigh¬ ed, fo that the proportion of the metal in the ore exa¬ mined may be afeertained. It may be added, that the precipitation is greatly promoted, by boiling for a fflort time, efpecially towards the end of the procefs, which produces the feparation of the lad portions of the cop¬ per 5 and it fflould be farther obferved, that a perfect feparation of copper from iron is obtained only when the folution is made in fulphuric or muriatic acid, and not in nitric acid. The method of feparating copper from filver has been already mentioned. It may be fe¬ parated from lead, by adding fulphate of foda to the fo¬ lution, by which an infoluble fulphate of lead is obtain¬ ed, and the copper remains behind. To feparate cop¬ per from antimony, the oxides of copper and antimony are digeded with nitric acid; the copper is diflblved, and the antimony is left. By immerfing^a piece of me¬ tallic tin in the folution, copper may be feparated from tin •, for by this means the copper only is precipitated. Arfenic is feparated from copper by diflblving in nitrous acid, and adding acetate or nitrate of lead, which pro¬ duces an infoluble arfeniate of lead, and leaves the chop¬ per behind. In cafe there fliould be an excels of lead, the addition of fulphate of foda will throw7 it dowm in the form of infoluble fulphate. When nickel is com¬ bined with copper, it is ufually conjoined with iron. Ammonia precipitates all the three metals ; but, wfflen added in excefs, redifiblves the nickel and copper. To obtain the latter feparate, fuperfaturate wdlh muriatic acid, and introduce a poliffled piece of iron, by which the copper is precipitated, and the nickel remains in the folution. To afeertain the quantity of precipitated copper ob- lained from the examination of an ore, it is to be waffl¬ ed and dried, put into a fmall crucible, moiftened with a drop or two of oil, and covered with borax. Thus prepared, it is fubjefted to ftrong heat for a few mi¬ nutes, / Chap. V. ORES, &c. Copper, nules, and a folid button of malleable copper is produ- * ced, which may be accurately weighed. But if the product of the analyhs be in the date of green carbo¬ nate, which is obtained by adding carbonate of potafh or foda to a folution of copper, the green precipitate, thus formed, is to be wafhed and dried at the tempera¬ ture of boiling water. An hundred and eighty parts of this carbonate are equivalent to loo of metallic copper. The quantity of copper obtained by analylis may be eftimated alfo in the date of black oxide. If the green carbonate be boiled for a few moments in caudic pot- ath, it thrinks and becomes a deep brownifh black fine powTder, which is a pure oxide of copper in its highed date of oxidation. One hundred parts of this oxide, after being well walked, and dried in a low red heat, for a minute or two, are condantly found to contain 80 parts of pure metallic copper. We diall now give a few examples of the analyfes of particular ores of copper. Vitreous copper ore, or fulphuret of copper from Sibe¬ ria.—The following is the mode of analyfis of vitreous copper ore by Klaproth. *•' “ i. Upon 200 grains of the ore, coarfely powdered, moderately drong nitric acid was affufed, which attack¬ ed and diflblved them with frothing and extrication of red vapours. The folution was clear, and the fulphur alone in the ore was left behind, fioating in the fluid, in gray, loofe flocculi, without any other refidue; which indicated that no antimony was prefent. The fulphur collected on the filter was heated in a fmall cru¬ cible to inflammation, and it burned with its peculiar odour, without any trace of arfenic ; yet leaving a flight portion of oxidated iron and filiceous earth. “ 2. The folution, which had a pure blue colour, was treated fird with muriate, and then with fulphate of foda. But none of thefe, nor any other fait, rendered it turbid, or produced any other alteration; by which it appears, that this ore contains neither filver nor lead. u 3. To determine, with proper accuracy, the propor¬ tion of the condituent parts, I repeated the examination in the following manner. Two hundred grains of the powdered ore were combined and heated with muriatic acid, to the degree of boiling. But as this alone ma- nifeded no action on it, I added nitric acid gradually, by drops, which exerted a drong attack in each in¬ dance. When the folution of the ore had been accom- plidied, I feparated the fluid from the fulphur floating on the furface •, and digeded this lad once more with a frefli quantity of muriatic acid, dropping into it fome nitric acid, after which I collected it upon the filter. This fulphur, waflied and deficcated, weighed 38 1- grs. out of which, after its combudion, grain of filiceous earth remained 5 fo that the true amount of fulphur was 37 grains. “ 4. The folution exhibited a glafs-green colour. I di¬ vided it into two parts. Into one half polidied iron was immerfed, upon which the copper precipitated of a den- dritical form, and pure metallic brilliance. It weighed 78^ grains, when waflied, and immediately deficcated in a moderate temperature. “ 5. In order to afcertain the proportion of iron con¬ tained in the ore, I combined the other half of the fo¬ lution with caudic ammonia added to excefs of fatura- -tion. The precipitated iron remained behind, in the form of a fubtle brown mud, which, collected on the filter, deficcated and ignited, weighed three grains. But as the iron is contained in the mixture of the ore, not in this calciform date, but in the reguline, which lad is to the fird in the proportion of 3 to 4, thefe three grains of oxidated iron give 2^ of metallic iron to be added in the computation. “ Therefore, an hundred parts of the Siberian vitreous copper ore confid of, Copper, Iron, Sulphur, Silex, 78.50 2.2 c 18.50 °'75 100.00 * EJaytr Variegated copper ore.—This ore was analyfed by1 ^ Klaproth, in the following manner. “ 1. One hundred grains of the pulverized ore were fubje£ted to gentle digedion with nitric acid, i?hofe ac¬ tion upon it was but moderate. From the refidue, the fulphur was driven out by combudion. This refidue, when a feCond time digeded with nitric acid, diflblved in it, leaving only a flight portion of a red oxide of iron. On examining the folution, fird by common fait, and then by Glauber fait, it continued limpid and unchanged. “ 2. Upon 200 grains of the powdered ore, muriatic acid was affufed, the mixture heated, and then com¬ bined in fmall portions with nitric acid. The folution, which was thus performed, had a brown colour while concentrated j but as foon as it was diluted with water, it acquired a green. The remaining fulphur was gray, tenacious, and fpongy, and weighed 72 grains when dry. By flow combudion it left 35 grains, of which, after extraftion by muriatic acid, five grains dill re¬ mained behind. Thefe lod one grain more of fulphur by burning, and the remaining four grains diffolved en¬ tirely in muriatic acid. Whence the quantity of ful¬ phur amounted to 38 grains. “ 3. The muriatic folution wTas divided into two equal parts j and the copper was precipitated from one of them by means of iron. It amounted to 69! grains. “ 4. The other half was fuperfaturated with caudic ammonia, and the oxide of iron which fell down was colledded. This, when moidened wfith linfeed oil, and expofed to a low red heat, weighed 1 o grains \ which are equal to 7 ’- grains of metallic or reguline iron. “ Thus, in 100 parts of this variegated copper ore from Norway were found, Copper, Sulphur, Iron, Oxygen, 69.50 19. 7-5° 4* 100.00 “ In fupplying the deficiency in the fum of weights of the copper, iron, and fulphur, from the hundred, by putting oxygen in the account, I mean to characterize this lad as a condant condituent part of variegated cop¬ per ore, producing in it thofe variegated colours: in the fame manner, as in deel, in copper pyrites, and other 432 ORE Copper, otter metallic fubftances, the beginning of tlieir oxida- ' '' v tion is indicated by a fimilar diveriity of colours. “ In the laft mentioned fubftances, however, the changeable colours are only owing to external caufes ; for which reafon, they prefent themfelves only on the furface, when, long expofed to air. On the contrary, the variegated copper ore is penetrated throughout its whole mafs by the oxidating principle. This corre- fponds with the deficiency of weight to make up the turn of the fixed conftituent parts of the ore here ana- lyfed ; whereas no fuch lots is obfervable in the vitreous copper ore, treated and decompofed by the fame me¬ thod. It is on this account alfo, that the aftion of the nitric acid is lefs ftrong, and the difengagement of ni¬ trous gas is lefs copious, in the variegated than in the * Ibid. i. vitreous copper ore 545* Malachite, or carbonate of copper.—Klaproth analy- fed a Siberian ore of this fpecies, according to the fol¬ lowing procefs. “ i. One thoufand grains of compact reniform mala¬ chite, fti. n the Tuijin mines, on the Ural, wrere redu¬ ced to powder, and heated to complete rednefs in a fmall glafs retort, connected wdth the pneumatic apparatus. Much carbonic acid gas was difengaged in this procefs, to the amount of 252 cubic inches, without reckoning that part which was abforbed by the water of the appa¬ ratus. This gas was entirely abforbed by lime water, at the fame time that a proportionate quantity of car¬ bonated or crude calcareous earth wTas produced. In the intermediate fmall receiver a moifture colledled, weighing 78 grains, which, upon trial, proved to be pure water. 2. The pulverulent refidue taken out of the retort ap¬ peared of a black colour, and weighed 716 grains. To ferve for the following experiments, it w^as divided into ■four parts, at 179 grains each; and hence correfpond- ing to 250 grains of the rough malachite. 3. One hundred and feventy-nine grains of ignited malachite, combined with three times its quantity of black flux, were put into an aflay crucible, without lin¬ ing it, and covered with muriated foda. In this fitua- tion it wras committed to the fire of the blaft furnace, and when the coals had become red hot without the ac¬ tion of the bellows, it was kept melting for the fpace of 20 minutes. After cooling, it was obferved that, in the broken retort, the whole mixture, under the co¬ vering of common fait, had run into an uniform, com- pa6t, and opaque mafs, of the bright red colour of or¬ dinary fealing wax, and that no metallic button had been formed. “ It follows from this, that there wras not carbone enough prefent to take up entirely the oxygen of the metallic oxide. Therefore the copper has, by means ©f this fmall remainder of oxygen ftill united with it, been brought into the ftate of red oxide of copper ; and, as fiich, it has diffufed itfelf uniformly through the alka¬ line fait. “ 4. One hundred and feventy-nine grains of ignited malachite wrere mingled with three times their quantity of black flux, and one-tenth of powdered charcoal. When fufed in this ftate, during 20 minutes, under a ftratum of common fait, in an aflay crucible not lined in the infide, they afforded a button of reguline cop¬ per, which had run wrell together, and weighed 136J grains. S, &x. Chap. V. “ 5. Another 179 grains of ignited malachite, mixed Copper, with thrice as many grains of black flux, and one-fifth '—“‘Y-—'' part of their weight of colophony, and likewife fufed for 20 minutes, under a cover of muriate of foda, in a crucible not fecured by lining, yielded a w^ell-melted button of reguline copper, weighing 138 grains. “ 6. The remaining 179 grains of ignited malachite wrere, like the preceding, melted during the time of 20 minutes, under a cover of common fait. But the allay crucible had previoufly been lined with powdered char¬ coal, and the malachite mingled wdth an equal weight of calcined borax, with half its quantity of wfliite glafs, and one-fourth part of colophony, or boiled turpentine. By this procefs 1 obtained, indeed, a well-fuled button of reguline copper; but with a confiderable lofs, as it weighed only 1054 grains. “ In order to difcover more accurately the conftituent parts of malachite, I performed the following experi¬ ments. “ 7. One hundred grains of malachite, reduced to powT- der by trituration, w’ere diffolved in nitric acid ; which wTas effeCled without leaving any refidue. The folution had a bright-blue colour, and was faturated to excels with cauftic ammonia ; but the precipitate produced was entirely, and wfithout turbidnefs, rediffolved by the excefs of the alkali. This thewed that the malachite here examined was perfectly free from iron, and fimilar admixtures. “ 8. I combined 100 grains of triturated malachite with a fufticient quantity of fulphuric acid, previoufly diluted with five parts of water, and accurately weighed together with the veffel. After the malachite had been wholly diffolved, which was effected gradually, and with a moderately ftrong effervefcence, the lofs of weight, occafioned by the carbonic acid gas that wras extricated, was found to confift of 18 grains. “ 9. One hundred grains of the fame powdered mala¬ chite were ignited, at a moderate heat, in a covered cru¬ cible. The black refidue had loft 29-^ grains in weight. If from thefe be fubtrafted 18 grains for the carbonic acid, the remaining 114 grains of lofs will confift of water. “ 10. And laftly, 100 grains, which had been diffol¬ ved in diluted fulphuric acid, and precipitated by zinc, yielded 58 grains of pure copper. “ In confequence of thefe experiments, the Siberian malachite cpnfifts, in the 100, of, Copper, Carbonic acid, Oxygen, Water, 58. 18. 12.50 11.50 100.00 * o * Hid. i. Muriate of copper.—This ore, when expofed upon 55°* charcoal to the aftion of the blow-pipe, gave to the flame a blue and green colour; the muriatic acid was foon driven off, and a metallic button of pure copper remained. This ore of copper wras examined and analyfed by Klaproth in the following manner. A portion of the ore being reduced to powder, and boiled with water, communicated no colour to the folution ; and, with the addition of a folution of nitrate of filver, afforded a fmall quantity of a white precipitate which blackened m 3 Chap. V. ORE Copper, in the day light. This experiment {hews, that the pro- u—-v portion of muriatic acid is too fmall to give a compound loluble in water. “ i. One hundred grains of the elutriated mineral dif- folved readily and quietly in nitric acid affufed in the cold. The folution poffeffed a pure blue colour, and depofited a little of a brown iron ochre, which, fe- parated by filtering, weighed a grain and a half. It was then diluted with water, and treated with a nitric folution of filver. The precipitated muriate of filver, when edulcorated, dried, and melted at a moderate de- gree of heat, in a filver pan, weighed 64! grains. “ One hundred parts of metallic filver yield by fuch combination 133 parts of muriated filver. But as this metal, to be rendered foluble in acids, takes up 12 per cent, of oxygen, thefe muft be fubtradled j fo that of this increafe of weight by 33 parts, there remain 20 4- for the muriatic acid. “■ Thefe principles being laid down, the above 64-3- grains of muriated filver will fix the proportion of the muriatic acid, contained in 100 parts of the ore, very nearly to 10 grains. “ 2. That I might be fure of having completely fepa- rated the muriatic acid from the nitric folution of this copper ore, I added the nitrated filver in a finall de¬ gree of excefsj and this lilver I afterwards threw down with muriatic acid, and filtered it off. Which done, the copper was precipitated in the metallic Hate, by means of a piece of polilhed iron immerfed in the fo¬ lution. It amounted to 57^ grains when colie ft ed and carefully dried. “ The copper, however, is contained in the ore as an oxide. In this ftate its weight is increafed 25 per cent, by the oxygen 5 which, for thofe 57.50 grains of me¬ tallic copper, juft now mentioned, gives, by calculation, 14.38 grains. “ Now, fince what is yet deficient from the firft wTeight of the ore employed is to be confidered for the greateft part as its wrater of cryftallization, and fince thofe 14 grains of ferruginous ochre do not belong to the com- pofition of the ore, the conftituent parts of the muriat¬ ed ore of copper may be faid to be in the 100 as fol¬ lows : Oxide of copper, 73. Muriatic acid, IO.I Water of cryftallization, 16.9 * EJfays, ' ii. 158. * IOO.O.,• P//<3^>//tf/e of copper.—The following is the method of analyfis adopted by Klaproth, in the examination of this ore. “ 1. Becaufethis ore is very much intermixed with its quartzofe matrix, I pulverized a portion of it, previoufly freed as much as poflible from the ftony matter, and af- certained the W’eight of quartz ftill united with it, by folution in nitric acid. The quartz amounted to 16 parts in 100 of the purified ore. “ On this confideration, I weighed 116 grains of the powdered ore, and poured nitric acid upon it. The mixture became of itfelf moderately warm. When the folution, aflifted by a little heat, was thoroughly brought about, and by means of filtration freed from the undif- folved quartzy matrix, it {hewed by its pure {ky-blue colour, that it contained no iron. You XV. Part II. vS, &C. “ 2. After the {mall portion of the predominant acid had been faturated with potaftr, I added to the folution diffolved acetate of lead, until no farther precipitation took place. The precipitate wras at firft drenched for a while with weak acetic acid, then elixiviated with wa¬ ter, and at laft perfectly dried in a low heat. It weighed 138 grains. “ That this precipitate wras a combination of lead with phofphoric acid, of this I had myfelf allured by a pre¬ vious experiment, made with another portion of the fame foflil. It exhibited the phenomenon, which is pe¬ culiar to phofphated lead j namely, that under the blow-pipe it runs into a pearl, which in the very mo¬ ment of fixation, rapidly affumes a garnet-like form with ftiining furfaces. “ Upon another portion of that precipitate, half its. weight of fulphuric acid, fufficiently weakened with water, was poured and digefted with it. The clear- fluid, which had been filtered off from the generated fulphate of lead, and contained free phofphoric acid, was firft half faturated with foda, and upon this per- feftly neutralized with ammonia. By cryftallization, it yielded microcofmic fait, or phofphate of foda and ammonia. “ 3. In order to difeover the proportion of the phof¬ phoric acid combined with thofe 138 grains of the pre-. cipitate mentioned before, I proceeded to the following experiment. “ I burned pure phofphoru* under a large glafs-bell, diffolved the obtained dry phofphoric acid in water, paf- fed it through the filter, and reduced it by evaporation, in a fand heat, to a fmaller volume. When towards the end of this procefs, flames of phofphorated hydro¬ gen gas appeared, I added nitric acid by drops till no longer any red vapours were difengaged. “ Of this perfeftly oxygenated unftuous liquid phof¬ phoric acid, I diluted 100 grains with water, and neutra¬ lized the liquor with finely powdered white marble ; of which 3 24 grains were employed. The mixture was evaporated to drynefs, and the dry mafs kept in a mo¬ derate red heat for half an hour. This ignited phof¬ phate of lime weighed 2564 grains. In the 324 grains of marble employed in this experiment, the portion of lime, or pure calcareous earth, amounts to 178.20 grains, which if fubtrafted from the above 256.50 grains, determine the quantity of the phofphoric acid ingredient in that calcareous phofphate to be 78.30- grains. “ From thefe data, taken together, it now was render¬ ed evident, that in thofe 138 grains of phofphated lead, which have been produced by the combination of lead with the phofphoric acid, conftituting a component prin¬ ciple of the portion of the ore examined,—the concrete phofphoric acid amounts to 30.95 grains. “ 4. The remaining part of the folution, which yet contained the cupreous part of the ore, was firft treated with falphate of foda, to feparate the fmall portion of lead it ftill held diffolved from a flight excefs of acetat- ed lead added in the procefs (2.) Which done, it was mixed with a little of uncombined fulphuric acid, and a piece of poliftred iron put into it to precipitate the cop¬ per, which I found to weigh 54.50 grains. But as this metal is contained in the ore in an oxidated ftate, which requires 25 per cent, of oxygen 5 there muft 68.13 grains be reckoned for the oxide of copper, 3 I “ One 434 ,. 0 P‘ E Copper. « One hundred grains of this phofphated ore of cop- , , per, therefore, conlift of, Oxide of copper, 68.13 Phofphoric acid, 3°-95 * Ibid. r ^99.08.” Arfcniate of copper, or 7ieedlc-fhaped copper ore.—This ore was examined by Klaproth, according to the follow¬ ing prqcefs. “ 1. Under the blow-pipe, upon charcoal, this ore de¬ tonates, emits a white arfenical fmoke, and runs into fmall reddifh-gray globules, which, when again fluxed with borax, yield a pure regulus of copper. “ 2. A pure, maflive fpecimen of this ore, weighing 50 grains, was kept, in a porcelain crucible during 15 minutes, in a moderate red heat. Its figure was not altered by the fire ; but its dark olive Colour was chan¬ ged into a bright grafs green, inclining to that of the filkin. Its weight was diminilhed by 1 ^ grain. • “ 3. Nitric acid diflblves it quietly in the cold, and the folution poffeffes an undefiled blue colour. By the addition of nitrated filver, the mixture is not in the leafl rendered turbid. Acetate of barytes produces a precipitate which entirely difappears upon dilution with water. The affufion of diffolved acetate of lead, forms with this folution a white precipitate, which upon the charcoal emits arfenical vapours, and is reduced to me¬ tallic lead, when combined with an excefs of ammonia, the precipitate falling down at firft, is dire&ly rediflbl- ved, no cloudinefs left behind, and the deep-blue co¬ lour is reftored to the liquor. “ 4. Alfo by the acetic acid this ore is gradually dif- lolved. Upon the evaporation of the folvent, a dark- green fait of a dendritical form remains behind.- “5. One hundred grains of the acicular olive copper ore, which had previoufly been freed, by means of elu- triation, from the admixed reddifli iron ochre, foon dif¬ folved in nitric acid, and without the application of heat. The folution, being accurately neutralized with carbonated potafh, -was combined with diflblved acetate of lead, until all precipitation ceafed. The obtained precipitate, when edulcorated and dried in a raifed tem¬ perature, weighed 1334- grains. “ 6. To he more convinced that this precipitate was an arfeniated lead, I drenched it with water, and digefted it with half its weight of fulphuric acid. The liquor feparated by filtration, contained uncombined arfenic acid. I neutralized it with foda, and treated one part of it with a folution of nitrated filver. This produced a copious precipitate of arfeniated filver, which poflef- fed the brick-red colour peculiar to it, emitted arfenical vapours upon the charcoal, and was readily reduced to pure filver. The remaining part of the folution, when mixed with liquid nitrate of iron, afforded the common whitilh precipitate of arfeniated iron. “ Now in order to afcertain, by means of a compara¬ tive experiment, the proportion of the acid of arfenic combined with the 1334-grains of the above precipi¬ tate (1.), I diffolved in water 100 grains of folid arfe¬ nical acid, and added to it a folution of acetated lead in fmall portions fo long as any precipitate would appear. The arfeniated lead then obtained weighed 297 grains after edulcoration and drying in a warm place. Hence it followed, that the quantity of concrete,acid of arfenic, S, &c. Chap. V. combined with thofe 1334 grains of the precipitate, Copper, which the acid of aj;fenic contained in the ore had pro- ' v~ duced, muff be efumated at 45 grains. “ And to be more affured that all the arfenical acid had been feparated from the nitric folution of the ore, I added a little more of acetated lead than would have been abfolutely requifite. 'I'his was afterwards again precipitated as fulphate of lead by adding fulphated Ibda, and filtered off. To the lolutkm, thus freed from the laff: precipitate, I added uncombined fulphuric acid, and precipitated the copper, now difengaged frcm its mineralizing acid, by means of a polifhed piece of iron, in the metallic ftate. Thus I obtained of it 4c 4 grains. “ But fince in the compofition of the olive copper ore the copper is contained in the ftate of an oxide, it yet remained to difeover the proportion of oxygen. To at¬ tain this end, I diflblved 200 grains of pure copper in nitric acid, diluted the folution with a fufficient quan¬ tity of water, and again precipitated the metal with a lixivium of cauftic potafh. The precipitate had a light- blue colour ; but after the mixture had flood a couple of days in a moderately warm place, that blue colour ■was changed into a brown. When feparated by filtra¬ tion, walhed with a large quantity of water, and de- ficcaled in a low heat, this precipitate amounted to 269 grains. Upon ignition it weighed only 250 grains, and appeared in the form of a very fubtle, fully-black powder. “ Therefore, becaufe according to this experiment, copper acquires an increafe of 25 per cent, of weight by combining with oxygen, it is obvious, that for the above 404 grains of metallic copper, we mull put in the account 50.62 grains of oxidated copper. “ In confequence of this decompofition, joo parts of the olive copper ore contain, Oxide of copper, 50.62 Acid of arfenic, 45. Water of cryftallization, 3-50 *99.12.” * Ibid. ii. 150. Sect. II. Of the Rcdutlion of the Ores of Copper. The proceffes employed for the redu&ion of cop-^ per ores in the large way are extremely Ample. It fcarcely ever happens, it has been remarked, that the fame order in conducing the different reducing procef¬ fes, even in cafes where the quality of the ore is found to be the fame, is obferved at two works. The fame remark, however, might probably be made with regard to other manufaftories, where the fame practical ma¬ nagement being long eftablilhed, and attended with or¬ dinary fuccefs, its inconveniences or advantages are rare¬ ly inveftigated, with regard to the abridgement of la¬ bour, or the diminution of expence. We ftiall now de- feribe the proceffes for the reduftion of copper ores, which are followed in different places, by which our readers, who are interefted in the fubjedl, will be en¬ abled to appreciate the advantages of each, or to fug¬ ged: improvements of which they are fufceptible •, and with this view, we (hall deferibe the operations for re¬ ducing copper ores which are followTed in Cornwall, and in Anglefea,. Method, * t * Chap. V. ORE Copper. Method of reducing copper ores in Cornwall.—The ore is firfl broken to pieces, of the iize of a hazle nut. This operation is known by the name of cobbing. The rich¬ er pieces of ore are then picked out by the hand. The next operation is roafting, which is performed in large reverberatory furnaces, 16 feet long, and 14 feet broad. The bottom of the furnace is compofed of fire bricks, covered with fand, two feet thick. This fand becomes a femivitrified mafs by the intenfe heat. The height of the chimney is from 40 to 50 feet, the draught of which is fo ftrong, that the fulphur and arfenic, fepa- rated during the roafting, are carried almoft entirely through it. The ore is introduced through a kind of funnel, and fpread to the thicknefs of a foot over the bottom of the furnace. The fuel is placed at the anterior part of the furnace, fo that the flame mull pafs over the furface of the ore as it is directed by the current of air towards the chimney. The ore is roafted in this furnace with a dull red heat for 12 hours, and is fre¬ quently ftirred with an iron rake, to expofe frefh furfa- ces to the flame. The ore being fufficiently roafted, is carried to an¬ other furnace, nine feet long by fix wide, where it is ex- pofed to a fufing heat, without addition, except that of a little calcareous fand, when the flag does not rife freely. It is raked out at the end of every four hours, when it is of the confiftence of foft dough, and is intro¬ duced into oblong moulds, a little water being fprink- led upon it, to make it fink down. The flag being ra¬ ked off, a frefh quantity of calcined ore is introduced into the furnace, and the copper is tapped off by a hole in its fide, which had been flopped up with wet clay mixed w ith one-fourth part of new coal, which prevents the clay from becoming fo hard as to render it difficult to open the hole by means of an iron pick. As the rough copper flows from the furnace, it is conduced by a gutter intd a large bucket, fulpended by chains in a well, through which a ftream of wrater is paffing. The metal, as it falls into the water, is granulated, wuthout explofion or danger, and is afterwards taken out by rai¬ ling the bucket. But in tlris ftate the copper is very impure, being quite brittle, and mixed with arfenic and fulphur, which can only be feparated by other procefles. For this pur- pofe it is again melted, and granulated two or three times. Each time a flag is thrown up in the furnace •, but as it contains fome copper, it is not, like the firfl flag, rejefled, but w'orked over and over again with new charges of calcined ore. The nature of the ore muft determine the number of fufions and granulations. After the granulation, the mafs is melted and caft into pigs, which have a bliftered appearance on the furfage. Thefe are again broken up, and melted and roafted fe- veral times, by which the metal becomes purer, and is then caft into iron moulds, after which it is carried to the refining furnace ; and being again melted with the addition of fome'charcoal, it is brought to fuch a de¬ gree of purity as to bear the hammer, and be fit for the market. In this way, by repeated calcination and fii- fion, the common ores of copper are freed from arfenic, fulphur, and earthy matters, and brought to the metal¬ lic ftate. Here it is proper to add, that where there is variety of ores, no fmall degree of judgement is requi- fite in forting and diftributing them for the furnace, that the more fufible ores being mixed with fuch as are S, &c. 435 more refradlory, will render the poorer ores, by the ad- Copper, dition of a portion of the richer, worth the work- ing- Method of reducing copper ores in Anglcfea.—The ore, wffiich is the fulphuret of copper, is broken into fmall pieces, and expofed to heat in a kiln, wffiich is clofe co¬ vered. A little fire is applied to the mafs of ore in different places, by which the whole is gradually kind¬ led. The kiln is furnifhed with flues, which open into a long, clofe, pent-houfe gallery, for the purpofe of col- lecling the fulphur, which rifes in the ftate of vapour to the top of the kiln, paffes through the flues into the long gallery, where it is llowly condenfed, is aftenvards taken out, and farther prepared for fale. The mafs of ore, after it is once kindled, burns of itfelf for about fix months, and in this time the fulphur chamber is four times cleared out. The improved fulphur chambers are conftrmfted in the form of lime kilns, having the ore at the bottom, and the fulphur fubliming at the top. The richer part of the roafted ore is exported w'ith*ut being fubjedled to any other preparation, but the poorelt part is melted on the fpot, and contains, befides a great deal of fulphur, many other impurities. The fmelting houfes confift of a range of large reverberatory furnaces, hav¬ ing chimneys above 40 feet high, thus producing a very ftrong current of air. Thirty-one of thefe furnaces are arranged fide by fide under the fame roof. The fuel, wffiich is coal, is burnt on a grate at the anterior part of the furnace, and the flame is carried over the ore pla¬ ced on the bottom of it, by the draught of air. Twelve hundred weight of roafted ore is introduced into the furnace, mixed with a fmall portion of coal dull. Here the ore is melted, and brought to an impure regulus, and when it is fufficiently fufed, it is drawn oft into earthen moulds. Each charge of the furnace is worked off in about five hours, and yields about half a hundred weight of rough copper, which after being farther pu¬ rified, affords about 50 per cent, of pure metal. In reducing copper ores at Neufol in Hungary, lead is employed in the refining part of the procefs. The rough copper is fpread out on the rough bed of a fur¬ nace, and after being fix hours in fufion, a quantity of lead, in the proportion of from fix to eight per cent, of the copper, is thrown in. This immediately begins to vitrify, and form a thick fcoria, along with the impuri¬ ties of the copper. The fcoriae are fucceffively remo¬ ved, till the whole is feparated, and the copper is puri¬ fied. The fcoriae retain a portion of the copper, and are employed in a future operation. The procefs con¬ tinues from ten to twelve hours, with fifty quintals of raw copper. Some of the finer copper ores contain fuch a propor¬ tion of filver, as to render it worth while to extract the metal. In the different roaftings and fufions which are employed to bring the copper to a ftate of purity, the filver always remains combined with it, fo that it muft be feparated by another procefs. The method of fepa- rating filver from copper has been already defcribed, in treating of the reduction of the ores of filver. The fprings wffiich are found in copper mines, or flow from rocks which afford copper ores, are often fo ftrong- ly impregnated wfith blue vitriol or native fulphate of copper, as to yield a confiderable quantity of this me¬ tal. It is obtained by the following procefs. Large, fquare open pits, are formed of rammed clay, two or 3 I 2 three 436 ORE lion. three feet deep. Into thefe pits the vitriol water is " y 'pumped a quantity of refufe iron is thrown in, which being allowed to remain for a conliderable time, the iron is diffolved by its ftronger affinity for the acid, and the copper being feparated, is precipitated in the form of brown mud. After the water appears to be exhauft- ed of the copper, the oxide of copper collefted at the bottom is raked out, and being dried in the fun, may be reduced in the ufual way. This material, which is the richeil employed in obtaining metallic copper, yielding fifty per cent, although contaminated with fome iron and clay, is rarely fmelted, excepting along with the poorer ores, fome of which do not afford more than five per cent, of pure metal. The plates of copper of a fine red colour, ufually known by the name of rofette copper, are made by a particular management. When the metal is found to be in a ftate of fufficient purity, the furface while in fufion is well fcummed, and allowed to cool till it is juft ready to fix. At this time the workman bruffies it over with a wet broom, by which the furface is immediately fixed, and a thin plate is feparated from the metal below, which is ftill in a fluid ftate. The plate thus produced is taken off and thrown into water, where it becomes of a high red colour. The fame operation is repeated and continued fucceffively till the whole of the fluid metal is converted into thin irregular plates of the above defcription. Chap. VI. Of the Ores of Iron. The ores of iron, which prefent a confiderable varie¬ ty, are reduced, on account of the refractory nature of this metal, with no fmall difficulty. The moft power¬ ful agents muft be employed for this purpofe. And as the conftruClion of furnaces is a matter of the greateft importance in the fmelting of iron ores, we were led, when treating of that fubjeft, to enter into a pretty full account of the proceffes themfelves 5 to this account the reader is referred for information on the methods followed in the reduction off thefe ores. The prefent chapter therefore will be only occupied in giving an abridged view of their analyfis. Sect. I. Of the Analyfs of Iron Ores. Native Iron.—In analyfing this ore, it may be dif¬ folved in diluted nitric acid 5 the lead may be feparated by adding fulphate of foda, thus forming an infoluble fulphate of lead 5 the oxides of iron and copper may be precipitated by means of cauftic fixed alkali at a boiling heat; the addition of cauftic ammonia will dif- folve the copper, and the iron will remain behind. Pyrites.—Iron pyrites is either magnetical, or is de- ftitute of this property. When the ore is magnetical, it may be either proper magnetical pyrites, or common pyrites with a mixture of magnetic iron, either in the metallic ftate, or in that of black oxide. If the mag- netifm be owing to black oxide mixed with common pyrites, no hydrogen gas will be produced by digefting it in muriatic acid ; and if metallic iron and pyrites be combined together, the gas obtained will be hydro¬ gen gas : but if the ore examined be magnetic pyrites, the gas evolved by muriatic acid will be fulphurated hydrogen. The following analyfis is applicable to both S, &c. Chap. VI. fpecies of pyrites. I. After reducing the pyrites to a Iron, very fine powder, let it be digefted in nitric acid of mo- derate ftrength, and boiled almoft to drynefs ; then add a freflr portion of acid, and repeat this procefs till the whole fulphur is converted into fulphuric acid. 2. Pour off the liquor, edulcorate the undiffolved refidue, and add the waffiings to the liquor. 3. Add to this carbo¬ nate of foda to a flight excefs, and feparate the precipi¬ tate, if any take place. 4. After neutralifing the refi- dual liquor by a little nitrous acid, it may be decompo- fed by muriate of barytes, which is to be added while any precipitate takes place. A hundred parts of this precipitate indicate 14.5 of fulphur in the ore. 5. The infoluble refidue (2.) is next to be digefted with cauftic foda, and being evaporated to drynefs and {lightly igni¬ ted, the precipitate (3.) is to be added, and the whole diffolved in muriatic acid, and boiled nearly to drynefs. By the affufion of water the filica will be left in the ftate of a white infoluble powder. 6. Mix the muriatic folution with ammonia in flight excefs, and the alumina and oxide of iron wall be precipitated together, leaving the lime, if there ffiould be any, in the folution, from which it may be obtained in the ftate of carbonate, by a mild alkali. 7. The iron and alumina may be fepa¬ rated by boiling in nitric acid, which leaves the metal¬ lic oxide untouched, or by digeftion in cauftic potaffi or foda, which produces a fimilar effeft. Magnetic Iron Ore, Specular Iron Ore, and Red Iron Ore,—are compofed chiefly of oxide of iron, with an accidental quantity of filica and alumina. Thefe ores are with difficulty afted on by acids alone. In conduc¬ ing the analyfis, therefore, 1. The ore is to be reduced to a fine powder, and heated in a filver crucible, with cauftic foda in folution. When the whole moifture is evaporated, the remaining matter is to be ignited to a low degree for a few minutes •, next diffolve the whole contents of the crucible in diluted muriatic acid 5 eva¬ porate the folution nearly to drynefs, and boil the refi¬ due in diftilled water, acidulated with a little muriatic acid, and the filica will remain behind undiffolved. 2. The folution being confiderably reduced by evaporation, add cauftic foda to a flight excefs, and boil it upon the precipitate which is thus obtained. This precipitate, after being edulcorated, is pure oxide of iron, and being heated with a little wax, it may be brought to the ftate of magnetic oxide, one hundred parts of which indicate feventy-three of metallic iron. In this way the quanti¬ ty of iron in the ore may be eftimated. 3. The alka¬ line folution contains the alumina, which may be fepara¬ ted by muriate of ammonia, and after being waffied and ignited, its quantity may be afcertained. Black Iron Ore, and Brown Iron Ore.—Befides the ingredients contained in the former fpecies, thefe ores are combined with a portion of manganefe ; the precipitate obtained, therefore, is a mixture of the oxides of iron and manganefe. Thefe oxides may be feparated by dif- folving them in muriatic acid, and adding to the hot fo¬ lution cauftic foda, drop by drop, till the liquor becomes colourlefs, or till the precipitate thrown down at each addition of the alkali begins to be white. In this way the oxide of iron is precipitated, while that of the man¬ ganefe remains in folution. The iron being removed, the oxide of manganefe may be obtained, by continuing the addition of foda till no farther precipitate is produ¬ ced, The two oxides may alfo be feparafed by adding fuccinate Chap. VI. ■ ORE Iron. fuccinate of foda to the muriatic folution, by which '““'v—-'' means the iron is precipitated, and the manganefe re¬ mains in folution. Sparry Iron Ore.—This ore of iron, which is fuppo- fed to contain carbonic aeid, the oxides of iron and manganefe, lime, magnelia and barytes, in the ftate of carbonate, wTith a fmall portion of lilica and alumina, may be examined according to the following analylis. i. Digeft the ore reduced to very fine powder, in muri¬ atic acid, with a little nitric acid : a flight efiervefcence takes place, and the lofs of weight indicates the quanti-' ty of carbonic acid driven off. 2. The infoluble por¬ tion of the ore, after being twice or thrice digefted in muriatic acid, is filica. 3. The muriatic folutions and wafhings, being mixed together, are to be concentrated by evaporation, and decompofed at a boiling heat, by adding cauftic foda in excefs. 4. Boil the precipitate and fupematant fluid together for a fhort time, the alu¬ mina only will be dilfolved. 5. The infoluble portion is next to be well wafhed and ignited, and being once abftrafted with nitric acid, the lime, barytes, and mag- nefia, wall be diflblved, leaving behind the oxides of iron and manganefe. 6. To feparate the oxides, digeft the mixture with a gentle heat in diluted nitric acid, with the addition of a fmall bit of fugar} the manganefe is diffolved, and the remaining oxide of iron may be brought to the magnetic ftate, by heating it with wax. 7. The nitrate of manganefe may be precipitated by carbonate of foda, and after wafhing and drying it at a heat below rednefs, pure carbonate of manganefe is ob¬ tained, one hundred parts of wThich indicate fifty-five of metallic manganefe. 8. To the nitric folution (5O? a good deal diluted with water, add fulphuric acid as long as any precipitate is formed. The fulphate of barytes thus obtained being removed, the other earths may be thrown down by means of the carbonate of an alkali; they are again diffolved in diluted fulphuric acid, and the fulphates of lime and magnefia thus produced, being precipitated by alcohol, may be feparated from each other by cold water. In this way the fulphate of magnefia is diffolved, with only a very inconfiderable quantity of the fulphate of lime. Argillaceous iron ore, bog iron ore, blue earthy and green earthy iron ores,—are chiefly compofed of the oxides of iron and manganefe, pholphate of iron, filica, alumina, and lime. The analyfis of thefe ores may be conducted according to the following procefs. 1. After the ore is reduced to powder, and ignited, abftraft it two or three times with nitric acid; pour off the acid, and walh the refidue with a fmall portion of ftrong ni¬ tric acid. 2. Add the acids together, evaporate nearly to drynefs, walh the refidue with cold water •, the phof- phate of iron remains behind. 3. Ignite the infoluble refidue (1.) with cauftic foda, and feparate the lilica as in a former analyfis, by muriatic acid. 4. Mix the ni¬ tric and muriatic liquors, boil them with an excefs of cauftic foda, and the alumina wrill be diffolved, while the metallic oxides and lime are precipitated. 5. After ig¬ nition, abftract the compound precipitate with nitric acid , the lime is now diffolved, and nothing remains but the oxides of iron and manganefe, which may be feparated according to the preceding analyfis. Arfeniate of Iron.—This ore is found to contain oxides of iron and copper, with arfenic acid, befides a portion of filica, and fometimes lime. It was ana- S, &c. lyfed by Mr Chenevix, according to the following procefs. Being reduced to powder, and fubjected to lefs than a red heat, the water of cryftallization is dri¬ ven off; the refidue is next boiled with cauftic potalh, and the alkaline folution being feparated by filtration, is to be neutralized with nitric acid. The addition of ni¬ trate of lead affords a precipitate of arfeniate of lead, one hundred parts of which indicate thirty-three of arfenic acid. Muriatic acid is next to be added to the refidue, which is infoluble in potafh j the iron and cop¬ per are thus diffolved, and the filica remains behind. By fuperfaturating the muriatic folution with ammonia, the oxide of iron will be precipitated, and the oxide of copper will remain in folution by the alkali. But, for practical purpofes, we fliall give a fliort view of the Ampler methods of affaying the ores of ironr which are chiefly employed in manufafture, with the view of afcertaining the quantity of metal to be ob¬ tained from them, when treated in the large wray. Among the older metallurgifts it was ufual to employ active faline fluxes in affaying the ores of iron; but as the metallic part of the ore can only be brought into fufion at a very high temperature, the fame degree of heat effects the vitrification of the earthy matters, when aided by lime and bottle glafs, fo that the ufe of borax, or alkaline falts, which are more expenfive, may be dif- penfed with. To affay the richer varieties of magnetic iron ore, particularly iron fand, reduce them to a fine powder, add one twelfth of charcoal, or double the quantity of fine faw dull, and expofe the mixture in a covered cru¬ cible for an hour to the heat of a powerful wind fur¬ nace. After this the iron will be found at the bottom of the crucible, in the form of an irregular button, and covered with .* fmall portion of cellular fcoriax This procefs will be fufficient where the quantity of earthy matter is fmall, but as the common magnetic iron ore contains a confiderable proportion of filica, a flux of the following materials may be neceffary. For every eighty parts of ore take eight of bottle glafs, fix of limeftone or chalk, and one of charcoal, mix the whole carefully together with the ore, and expofe the mixture to heat as in the former cafe. If the operation have fucceeded^ a button of iron will be found at the bottom of the crucible, covered by a compaft, vitreous, greenifli flag* . . . As the fpecular iron ore generally contains a portion of fulphur, from the admixture of pyrites, it muft be roafted at a moderate red heat, till the liilphureous odour is no longer perceptible •, then to eight parts of the ore, add eight of bottle glafs, fix of chalk, and one twelftk, of charcoal, and treat the mixture as before. The red, brown, and black iron ores, may be affayed in the fame way. Sparry iron ore may be affayed without roafting, by reducing it to powder, and placing it in a crucible lined with a mixture of charcoal and clay, and then covering it with about one fourth of its weight of cal¬ cined borax. In affaying argillaceous and bog ores of iron, they are firft to be roafted, and then mixed with eight parts of bottle glafs, feven of chalk, and one and a half of char* coal, to eight parts of ore, and fubjefted to fufion in an unlined crucible. It is fcarcely neceffary to obferve, that the proportion of chalk may be diminiflied in treat- wg, 438 ORE Leatl. ing thofe varieties of ore which contain calcareous earth jn quantity. SECT. II. Of the ReduBlon of the Ores of Iron. In treating of the conftruftion of furnaces, the pro¬ per form and management of which are of the utmofl importance in extracting the metal from the ores of iron, we were led to enter pretty fully into the nature and effedts of the fmelting procefs, or the method of reducing iron ores. We (hall not, therefore, refume the fubjeCt in this place. See Furnace. Chap. VII. Of Lead. In the prefent chapter we {hall firft give an account of the molt improved methods of analyfing the ores of lead} and fecondly, treat of the belt methods of redu¬ cing or fmelting thefe ores. Sect. I. Of the Analyjis of Lead Ores. The analyfis of the ores of lead is lefs difficult than that of the other metals of which wre have juit now treated 5 and when accuracy is wanted, the humid way of analyfis is to be preferred. The method of fepara- ting lead from filver has been already noticed, as well as that by which it is feparated from iron and copper. The fame procefs as that employed for feparating iron and copper from lead, may be followed with regard to the feparation of lead from tin, cobalt, and zinc. We ffiall now give an account of the analyfis of particular lead ores. Galena, or fulphuret of lead.—This fpecies, which is the moft common ore of lead, was a-alyfed by Vau- \Jour.des quelin, by the following procefs f. I. Three hundred Mmes, parts of the ore reduced to powder, were roafted, and Tn° Jxviii. l0p;? during the procefs, twelve per cent. 2. Three hundred parts of the fame ore wrere heated with nitric acid very much diluted 5 a flrong odour of fulphurated hydrogen was perceived, and the folution of the lead being completed and filtered, there remained on the fil¬ ter pure filica, which being heated to rednefs and cool- •ed, weighed fifty grains, or 16.67 parts per cent. 3. The folution of lead in nitric acid being decompofed by means of fulphate of foda, and the fulphate of lead pre¬ cipitated being wafhed and dried, weighed 250 grains, or 63.1 of metallic lead per cent. 4. After the ful¬ phate of lead was feparated, ammonia was added, and a precipitate of oxide of iron was obtained, which being fubjecfed to a red heat, weighed ten grains, or was eqvial to 3.33 per cent. 5. Carbonate of potaffi being added to the refidual liquor, threw down nine grains of carbo¬ nate of lime, which is equal to three per cent. The fulphuret of lead thus analyzed, afforded in one hundred parts, Sulphur, - 12. Silica, - - 16.67 Metallic lead, - 63.1 Oxide of iron, - 3.33 Carbonate of lime, - 3. . Lofs, - 1.9 100.00 S, &c. Chap. VII. To affay galena in the dry way, it is to be mixed af- Lead, ter roafling with, three times its weight of black flux, ^ v ~ f covered with fait, and melted. A button of lead will be found at the bottom of the crucible, but the filver and other metals which exilled in the ore, are flill com¬ bined with the metallic lead. Sulphuret of lead, antimony and copper.—An ore of this kind was analyfed by Mr Hatchett, by the follow¬ ing procefs. Two hundred grains of the ore were heat¬ ed in a matrafs, with two ounces of muriatic acid, and nitric acid was very fiowly added, till the whole exhibi¬ ted a moderate effervefcence. Being gently heated for an hour, the folution affumcd a green colour, and a quantity of fulphur which floated on the furface, being collected, digefled feparately with a little muriatic acid, and wraihed and dried, weighed thirty-four grains j and as it burnt entirely away w ithout any refiduum, in a red earthen cup, it w'as perfectly pure. The folution with the muriatic acid, in which the lulphur had been wafh¬ ed, was firft boiled, and afterwards mixed with fix pints of boiling diftilled water, to which it communicated a milky appearance. It was filtered while hot, and the filter walked with another portion of boiling water. The wffiite precipitate, which was oxide of antimony, was dried in a fand bath, and weighed fixty-thvee grains. When the liquor with the wTafhings cooled, feme cryftals of muriate of lead w'ere depofited. The liquor wras af¬ terwards evaporated nearly to drynefs, and a few drops of fulphuric acid were added, to leparate the lead which remained in folution. The refidue being again diffolv^d in boiling water, was entirely decompofed by fulphate of foda, and the fulphate of lead thus obtained being added to the former portion, wras wafhed and dried on a fand bath. It weighed 120 grains. The liquor, which wTas now bluiih green, a {fumed a deep blue colour lay the addition of ammonia; a fmall portion of the oxide of iron was feparated, which, when dried and heated with wax, became magnetic, and amounted to 2.4 grains. The liquor, after being eva¬ porated nearly to drynefs, was boiled with a ftrong lolu- tion of potaffi, till it was nearly dry, and the refidue being wafhed with water, a black oxide of copper re¬ mained ; which, after being dried, weighed thirty-two grains. White lead ore, or carbonate of lead.—The white tabular lead ore, from Leadhills in Scotland, was ana¬ lyfed by Klaproth, according to the following pro¬ cefs. “ x. One hundred grains of it, in pure fpecimens, and previoufly triturated to a powder, were by fmall portions introduced into a mixture of 200 of nitric acid with 300 grains of w^ater, and put in equilibrium upon the balance. The ore diffolved readily, and with a ftrong effervefcence, without leaving any refidue. By the car- bpnic acid that efcaped, there was a lofs of 16 grains of wreight. “ 2. The folution, which vras clear and colourlefs, was diluted with neater, and a cylinder of zinc put into it. After 24 hours, the whole of the lead had fliot into beautiful metallic laminae, which colledled, waffied, and both quickly and carefully dried, to the end that no oxidation might take place, afforded 77 grains of lead in the reguline ftate, which correfpond with 82 grains of oxidated lead. “ Confequently, the conftituent parts of this tabular 2 and Chap. VII. ORE Lead, and carbonated white lead ore, bear to each other the following proportion : t Ibid. ih 125. Oxide of lead, Carbonic acid, Water. * ii. 132. 82. 16. 2. IOO.” % Green lead ore, or phofphate of lead.—The following is an example of the method of analyfmg this fpej'ies of ore, adopted by Klaproth. “ 1. An hundred grains of this ore, in very pure fpeci- mens, left on folution in dilute nitric acid one half grain of the quartzofe matrix behind ; which I feparated and replaced by an equal quantity of pure ore. The co- lourlefs folution, treated with nitrate of filver, yielded 10 grains of muriated filver: which indicates 1 •54 of concrete muriatic acid, contained m 100 of the ore. “ 2. In the next inflance, the ingredient lead was fe¬ parated by means of fulphuric acid. The collected ful- phate-of lead, after gentle ignition, weighed 1044- grains 5 for which 77.10 grains of oxidated lead muft be put in the account. “ 3. When after this the nitric folution had been freed, by nitrated barytes, from the portion of fulphuric acid added to excels, and fubfequently treated with ammonia fo far, that the acid Hill predominated, I continued adding a folution of acetated lead, till no more turbid- nefs was effected. The generated phofphate of lead, v.hen collected and expofed to a gentle red-heat, pro¬ ved to weigh 85 grains 5 and confequently, the pro¬ portion of the phofphoric acid mult have been grains. f 4- The remaining fluid was mixed with muriatic acid, the mixture evaporated to drynefs, and extracted with ardent fpirit. Ihe refidue, after completely eva¬ porating the fpirit, was again dilfolved in water, and treated with Prufiian alkali. A. precipitation of pruffi- ated iron enfued, which indicated the amount of oxide of iron 10 grains. “ I rom the refults of this decompofition it follows, that the conftituent parts of green lead ore, and their proportion to each other, are : Oxide of lead Phofphoric acid Muriatic acid Oxide of iron 77.10 19. I*54 0.10 f 97.74.” Red lead ore, or chromate of lead.—In analyfing this ore, Vauquelin adopted the following fimple procefs. Itqual weights of the ore reduced to fine powder, itrong muriatic acid, and diftilled water, were digefted together at a moderate temperature, and ftirred from time to time. The chromate of lead is thus decompo- fed, and converted, for the moft part, to muriate of lead, which is of a white colour. When the acid has ceafed to a6I, pour off the liquor, add frefh muriatic acid, dilu¬ ted as before with an equal weight of wrater, and to the amount of about one fourth of the former quantity, and digeft till the whole of the orange coloured par¬ ticles among the white muriate difappear. This liquor is to be .addsd to the former, along with the walhings ^ S, &c. 439 the whole is to be heated, and placed in a cool place for Lead, a fewT days, that the fmall portion of muriate of lead which it holds in folution, may be depofited } and this being removed, add very gradually oxide of filver, preci¬ pitated from its folution in nitric-acid by cauftic potafi;, till the lafi; portions aflume a red purple colour. In this way the whole of the muriatic acid is feparated, and the liquors contain only chromic acid, which is de¬ pofited by How evaporation in the form of fmall, prif- matic, ruby red cryfials. The quantity of muriate of lead, obtained by this procefs being afeertained, will drew the quantity of metallic lead contained in the ore. Yellow lead ore, or tnolybdate of lead.—Klaproth analyfed this ore in the following manner. “ 1. A hundred grains of the cryftals were carefully freed from the adhering calcareous earth and ochre of iron, and then finely pulverized. They were then dif- folved in muriatic acid, aflifted by heat, alternately affufing upon them the acid, and a large quantity of rvater. In this inftance a trace of filiceous earth, though fcarcely difcernible, appeared. “ 2. The greateft part of muriate of lead, generated in the procefs, wxis depofited in fine needles, even before the folution had completely grown cold. The fuper- natant clear fluid was then poured off, reduced to a fmaller volume by evaporation, and freed from the mu- tiated lead, which ftill feparated. The muriated me¬ tal, collected with care, and brilkly deficcated, weighed 744 grains. By difiblving it in hot whaler, and lleeping into the folution a poliflied piece of iron, the lead pre¬ cipitated upon this laft in fine lamellae, and in the me¬ tallic Hate. “ 3. But in order to find more accurately- what pro¬ portion this muriated lead might bear to pure oxide of lead, I made the following experiment. _ “ Two hundred grains of lead, cut into fhreds, were diflblved in 300 grains of nitric acid, diluted with 10 ounces of water, and, with the afliftance of digeftion, in a boiling heat. The folution was.then divided into two parts. “ a. Into one half I dropped muriatic acid, as long as it produced any turbidnefs •, evaporating afterwards the mixture to the moft perfect drynefs of the refidue. The muriate of lead here produced weighed 133 grains. “ b. From the fecond half of the nitric folution I precipitated the oxide of lead by diffolved cauftic pot- afh. This oxide, when edulcorated and brilkly dried till it began to turn yellowifh, amounted to x 15 grains'. “ From this it folknved that thofe 744 grains of mn- riated lead, obtained from 100 grains of the yellow mo¬ lybdate of lead (2.), are equal to 64.42 grains of pure oxide of lead. “ 4. The concentrated muriatic folution of molyb- dena, which had a blue colour, wras mixed with nitric acid, and lodged in a fand-bath for farther evaporation. Being thus circumftanced, it was again diverted of its blue colour, and a yellow oxide of molybdena fepara¬ ted. But when the evaporation had been carried on to complete drynefs, I collected and weighed the re¬ maining lemon-yellow oxide of molybdena ; and found it amount to 344 grains. “ Wherefore, one hundred parts of the pureft cryftals of the yellow7 lead ore. from Carin’thia, contain, Oxide • 44° Lead. ORE Oxide of lead 64.42 Oxide of molybdena 34.25 *"r * 9S-67-” Sulphate of lead.—This ore of lead was analyfed by Klaproth according to the following procefs. “ 1. One hundred grains of tabular fulphate of lead from Wanlockhead, in feleft pure fpecimens, loft 2| grains, by being heated in a covered crucible. When finely pulverized and ignited in a platina crucible with 400 grains of carbonate of pota(h,they yielded a brown- ilh-yellow, moderately concrete mafs. Upon this fub- ftance, previoufly triturated, water w7as affufed and heat applied to promote the folution of the foluble parts. As in the cafe of the preceding foffil, fo in this an oxide of lead depofited from the liquor, which, when waftied, dried and moderately ignited, weighed. f]o\ grains. Diluted nitric acid took the whole of it up without the aflxftance of heat, and afforded a clear lo- lution, from which the lead has been precipitated in the reguline ftate, by means of zinc. The metallic lead, thus obtained, when collected, wafhed and quickly dried, amounted to 654 grains. “ 2. In order to afcertain the quantity of fulphuric jacid contained in the alkaline folution, it was combined with nitric acid added to fuper-faturation in fome de¬ gree, and, in the next inftance, treated with acetate of barytes. By this management fulphate of barytes was formed and precipitated, to the amount of 76 grains, after being heated to rednefs: which indicates 25-3: grains of concrete fulphuric acid. 44 According to this decompofition, an hundred parts of this tabular fulphate of lead confift of, S, See. Chap. VII. denly folid, and are removed to the fide of the furnace. Tin. The tap hole is now opened, and the lead runs into v “* moulds, in which oblong maffes or pigs, about 60 pounds each, are formed. After the lead has run out of the furnace, the hole is again clofed, the fcorim are replaced in the bed ; and the heat being raifed to a glowing red, they are foon melted. The greater part of the lead fe- parates from the flag, and collects in a mafs at the bot¬ tom. The fcoriae become folid with the addition of a little lime, and the lead is let off into the mould. The fecond fcoriae ftill contain a portion of lead, from fi^ to eight per cent. } but as it is not worth the expence of extracting, it is thrown away. It is found that the firft running of lead is the belt •, the fecond, which is ob¬ tained from the fcoriae, being confiderably harder, on ac¬ count of a greater proportion of iron combined wdth it. The procefs which is followed, at leaft in moft parts of Scotland, is fomewhat different from that now de- feribed, particularly in the previous preparation of the ore. The maffes of ore, as it is brought from the mine, being feparated from any adhering impurities, are reduced to fmall pieces, well waftied, and then pulverifed. In this ftate it is ready for the fmelting procefs, which till of late was ufually performed in an open furnace. In fome mining countries there is a confiderable pro¬ portion of white lead ore mixed with the galena ; doubts have been entertained whether it be profitable to retain this ore, even although it contain a large proportion of metal, becaiife in the reverberatory furnace it is vitrified immediately on the application of the heat, and a Cling as a powerful flux, the whole is brought into fufion be¬ fore the fulphur be entirely feparated j fo that the pro¬ portion of fcoriae in this cafe is greatly augmented, with very little increafe in the produce of lead. Oxide of lead 70'5° Sulphuric acid 25.75 Water of cryftallization 2.25 f Ibid. f 98.50” ii. 130. Sect. II. Of the Reduciion of the Ores of Lead. Galena is by far the moft abundant ore of lead, and indeed almoft the only ore which is fubjefted to the pro¬ cefs of redudion. The treatment of this ore of lead in this way is very Ample. The firft objeCf in drefling the ore, is to feparate the extraneous matters or impuri¬ ties, fuch as iron pyrites, blende, calcareous fpar, quartz, &c. The purer part of the ore is broken to pieces about the fize of a hazle nut, and waftied from any earthy matters which adhere to it, and then it is ready to be fmelted. A ton, or a greater quantity of the ore, is fpread on the floor of a common reverberatory fur¬ nace, with a low arch, and with the flame of pit coal it is quickly brought to a red heat; being, during this time, occafionally ftirred with iron rakes, to expofe frefti furfaces to the adion of the heat. When it begins to affume the confiftence of pafte, the heat is lowered, and kept at a dull red, till the whole of the fulphur is near¬ ly driven off; when the heat is increafed, and the ore brought to perfed fufion. The mafs confifts of two fluids, the upper being a vitreous flag, and the lower me¬ tallic lead. The fire is now damped, and a few fpadefuls of quicklime thrown in, by which the fcoriae become fud- 4 Crap. VIII. Of the Ores of Tin. There is no great variety of the ores of tin. It is ufually found in the ftate of oxide, or in that of fulphu- ret, when it is alfo combined with copper, and a fmall proportion of iron. Sect. I. Analyfs of the Ores of Tin. Before treating of the analyfis of the ore of tin, we ftiall firft deferibe a very Ample procefs for affaying it. The ore is firft reduced to the confiftence of coarfe fand, and feparated from the ftony matters by waftiing. If it appear, by fubjeding a grain or two to the adion of the blow-pipe, that it contains arfenic, 200 grains of the ore mixed with a little charcoal, are to be roafted in a calcining teft at a low red heat, till the w'hole of the arfenic is driven off. The refidue is withdrawn, mixed with a little pitch and fine faw-duft, introduced into a crucible lined with charcoal, and after a cover is luted on, placed in a large furnace, whofe heat is to be raifed to a bright red. In about 20 minutes the reduc¬ tion is completed, the crucible is removed, and a button of metallic tin is found at the, bottom, covered with a little fcoriae. But if the ore (hould contain no arfenic, the previous procefs of roafting is unneceffary. Tin f one.—The beft method of analyfing the ores of tin, is that contrived by Klaproth, by means of the fixed alkalies, which was conduced according to the following procefs. 1 I Chap. Tin. Vin. ' ORE “ i. One hundred grains of tin-flone from Alternon, - in Cornwall, previoufly ground to a fubtle powder, were mixed in a filver veffel with a lixivium containing 600 grains of cauftic potafli. This mixture was evaporated to drynefs in a fand heat, and then moderately ignited for half an hour. When the gray-white trials, thus ob¬ tained, had been foftened while yet warm, with boiling water, it left on the filter 11 grains of an undiflolved refidae. “ 2. Thefe 11 grains, again ignited with fix times their tveight of cauftic potalh, and diflolved in boiling water, left now only grain of a fine yellowilh-gray powder behind. “ The alkaline folution (i. and 2.), which wras in fome degree colourlefs, was faturated with muriatic acid. A brilliant white, tender oxide of tin was thrown doivn, giving to the mixture a milky appearance. Ihis precipitate, re-diffolved by an additional quantity of mu¬ riatic acid, was precipitated afrefli by means of carbona¬ ted foda. When lixiviated and dried in a gentle heat, it acquired the form of bright yellowilh tranfparent lumps, having in their fracture a vitreous luftre. “ q. This precipitate, being finely powdered, foonand entirely diffolved in muriatic acid, aftifted by a gentle heat. Into the colourlefs folution, previoufty diluted with from two to three parts of water, I put a flick of zinc} and the oxide of tin, tnus reduced, gathered around it in delicate dendritic laminae of a metallic luftre. Thefe, when collected, waftied, and fufed, un¬ der a cover of tallow, in a capiule placed upon char¬ coal, yielded a button of pure metallic tin, weighing “ 5. The above mentioned refidue of i-J grain, left by the treatment with cauftic potafh (2.), afforded with muriatic acid a yellowdih iolution } from which, by means of a little piece of zinc introduced into it, one half grain of tin wras ftill depofited. Pruflian alkali, added to the remainder of the iolution, produced a fmall portion of a light-blue precipitate •, of which, after fub- trafling the oxide of tin now combined with itrhardly one fourth of a grain remained, to be put to the ac¬ count of the iron contained in the tin-flone, here exa¬ mined. “ In thefe experiments, (excepting only a flight indi¬ cation of iilex, amounting to about three fourths of a grain), no trace has appeared, either of tungftenic oxide, w hich fome mineralogifts have fuppofed to be one of the conftituent parts of tin-ftone, or of any other fixed fub- ffance. Therefore, wdiat is deficient in the fum, to make up the original weight of the foffil analyfed, muft be afcribed to the lofs of oxygen } and thus the confti¬ tuent parts of pure tin-ftone from Alternon are to each other in the following proportion : * EJfayu Tin 77-50 Iron 0.25 Silex 0.75 Oxygen 21.50 100.00 Tic analyfis of grained tin ore, or wood tin, may be condmfted in the fame way as the former. Tin pyrites.—The following is the procefs which Klaproth adopted in the analyfis of this fpecies of tin ere. Voi~ XV. Part II. S, &.C< “ 1. Two drams of finely triturated tin pyrites were treated with an aqua regia, compofed of one ounce of muriatic and a half ounce of nitric acid. Witnin 24 hours the greateft; part -of the metallic portion was dif¬ folved in it, without application of heat j while the ful- phur rofe up, and floated on the furface of the menftru- um. After the mixture had been digefted upon it for fome time in a low fand-heat, I diluted it with water, and filtered it. It left 43 grains of fulphur on the pa¬ per, ftill, howrever, mixed with metallic particles. When the fulphur had been gently burnt off on a tell, there flill remained 13 grains } of which eight were dil- folved by nitro-muriatic acid. The remaining part w as then ignited with a little wax 5 upon which the magnet attracted one grain of it.—What remained was part of the filiceous matrix, and weighed three grams. “ 2. The folution of the metallic portion (1.) was combined with carbonate of potafh j and the dirty green precipitate, thus obtained, was re-diffolved in muriatic acid, diluted with three parts of water. Into this fluid a cylinder of pure metallic tin, weighing 217 grains, was immerfed. The refult was, that the portion of cop¬ per contained in the folution, depofited itfelf on the cylinder of tin $ at the fame time that the fluid began to lofe its green colour, from the bottom upwards} un¬ til, after the complete precipitation of the copper in the reguline ftate, it became quite colourlefs. “ 3. The copper thus obtained weighed 44 grains. By brifk digeftion in nitric acid, it diffolved, forming a blue tinflure, and left one grain of tin behind, in the character of a white oxide. Thus the portion of pure copper conftfted of 43 grains. “ 4. The cylinder of tin, employed to precipitate the copper, now weighed 128 grains ; fo that 89 grains of it had entered into the muriatic folution. I rom this, by means of a cylinder of zinc, I re-produced the whole of its diffolved tin, which was loofely depofited on the zinc in a tender dendritical form. Upon being affured, that all the tin had been precipitated, I collefted it care¬ fully, lixiviated it cleanly, and fuffered it to dry. It weighed 130 grains, I made it to melt into grains, having it previoufly mixed with tallow, and under a co¬ ver of charcoal dull, in a fmall crucible; w’hich done, I feparated the powTder of the coal by elutriation. A- mong the wafhed grains of tin, I obferved fome black particles of iron, which were attrafted by the magnet, and weighed one grain. Uedu£ling this, there remain 129 grains for the weight of the tin. By i'ubtracling again from thefe laft, thofe 89 grains, which proceeded from the cylinder of tin employed for the precipitation of the copper (2.) there remained 40 grains for the por¬ tion of tin contained in the tin pyrites examined. Hence, including that one grain of tin, which had been feparated from the folution of the copper (3.), the por¬ tion of pure tin contained in this ore amounts to 41 grains. An hundred parts yielded, 441 Tin. Sulphur 25 Tin 34 Copper 36 Iron 2 Bartliy matters 13 100*” 3* * Ibid. i. s^- Sect. O R 442 Tin. E Sect. II. Of the ReduBion of the Ores of Tin. Tin ftone, or vein tin, as it is called in Cornwall, con¬ tains a large proportion of ftony matters. It is tirfl broken by hammers into pieces of the fize of a hen’s egg, when it is ready for the operation of fbmping, which is performed in the way already defcribed for the ores of gold, excepting that there are only three hamp¬ ers. A tin plate about a foot fquare, and pierced with holes to admit a moderate fixed knitting-needle, is in¬ fected in front of the trough, and that furface of the plate with the rough extremities of the holes is on the infide, by which the holes are prevented from being plugged up with the ore. As the ore is reduced to the proper finenefs, it paffes with the water through the holes into the labyrinth, where it is collefted, and after being walhed on a wooden table, when it is ready for roafting. In this itate it has a confiderable proportion of copper and iron pyrites, and is called black tin. Af¬ ter being calcined at a low red heat for feveral hours, in a large reverberatory furnace, the ore comes out of a bright ochrey red colour, owing to the decompofition and oxidation of fome of the metallic fubltances 5 but the oxide of tin, when the operation is properly con¬ duced, remains unaltered. The ore is walhed a fecond time, to feparate the remaining impurities j and the water which is impregnated with fulphate of copper, is retain^ ed and decompofed by means of old iron. The redu&ion of the ore is the next ftep in the pro- cefs. Seven cwt. of roailed ore, with one fifth of its bulk of fmall coal, are introduced into a reverberatory furnace, which is about feven feet long, and 34 wude. No lime, or indeed flux of any kind is required. A brilk heat is kept up for about fix hours ; the tin finking down as it is reduced, and covered with black fcorise. The furnace is now tapt, and the metal flows into a Ihallow pit. When the whole of the metal has run out, the fcor;ae are removed from the furnace, and a frelh charge is made. The metal in the pit throws up a flag, rich in metal, which is immediately returned into the furnace; and after the melted tin has cooled a little, it is taken out with iron ladles, and poured into granite moulds. Each charge affords on an average from four to five cwt. of metal ; but as the firft fcoriae are not en¬ tirely free from metal, they are again ftamped and walh¬ ed, and mixed with a new parcel of roafted ore. The pigs of tin are next put into a fmall reverberatory fur¬ nace ; where, without any addition, they are fubjeCed to a very gentle heat ; the pureft part of the tin melts firft, and is drawn off, forming what is called common grained tin j the other part contains fome copper, arfe- nic and iron, which is brought to a ftate of fufion, and call into pigs, forming common tin. Stream tin ore, which is peculiar to Cornwall, is prepared for the furnace by reducing it to powder, and palTing it through wire fieves, which have 16 melhes in the fquare inch. A blaft furnace is employed, which is about feven feet high, and is fupplied with air from two cylinders walhed by an overlhot wTater wheel. The me¬ thod of managing the furnace, after being fully heated, is the following. Three or four Ihovels full of ore, and two or three half bulhels of charcoal, without any kind of flux, form a charge with which the furnace is fed at Ihort intervals. There is a foiall channel at the bot- s, &e. Chap. IX. tom of the furnace, through which the reduced tin is conftantly flowing into a pit below, and the flag which accompanies it is removed from time to time, and re¬ turned into the furnace. When the pit is full, the melt¬ ed metal is removed into an iron boiler three feet in diameter, having a fmall fire under it, to keep the me¬ tal in fufion. Two or three large pieces of charcoal are then placed upon the tin, and forced to the bottom by means of an iron inftrument refembling a wheel, with a long handle fixed in the axle. This produces a violent ebullition, and a little flag, before mixed with the metal, rifes to the furface, and is removed. In a minute or twro the metal is tried, as it is called, by taking up a la- dleful, and returning it again into the mals ; wrhen, if it affume a bright filver-like appearance, and a uniform confiftence, the purification is complete. When cool to the proper degree, it is removed into the moulds, where it is formed into pigs of two or three cwt. Stream tin ore yields from 65 to 75 per cent, of the beft and pu¬ reft tin *. Chap. IX. Of the Ores of Bifmuth. Bifmuth. * Aikiu'r Ditlion. Chem. &c. ii. Bismuth is found in the metallic ftate, accompa¬ nied by native filver, blende, and galena, fome other metals, and earthy fubftances. It is alfo met with in the ftate of oxide, and alfo in the ftate of fulphuret. Sect. I. Of the Anahjfs of the Ores of Bifmuth. In conducing the analyfis of the ores of bifmuth, previous roafting is not requifite. The native bifmuth, or oxide of biimuth, diffolves readily in nitrous acid, diluted with about one third of water, and either in the cold, or with a moderate heat j but boiling is neceffary for the fulphuret, to precipitate the fulphur, and diffolve the bifmuth. The greater part of the nitrate of biimuth may be precipitated from the folution, and feparaied from the metals with which it is ufually alloyed, by ad¬ ding a large quantity of water. But to'leparate the bifmuth totally, evaporate the clear liquor which remains over the precipitated oxide to a fmall bulk, fo as to re¬ tain in folution the nitrates of the other metals. Add muriatic acid by drops, as long as any w'hite cloud is formed. This laft precipitate confifts of the remaining portion of the oxide of bifmuth, mixed with muriate of filver, if the ore examined contain any of that metal. Then add a few’ drops of ftrong nitric acid, w’hich dif¬ folves the bifmuth, and leaves the filver \ and to this porlion of the nitrate of bifmuth add water, which fe- parates the whole by precipitation. To afcertain whe¬ ther the folution contains any filver, expofe the precipi¬ tate by muriatic acid to the light, which will become of a bluifti or flatey colour, if any filver has been diffolv- ed j but if not, the pure white colour remains unalter¬ ed. As the oxide of bifmuth is compofed of 81.3 per cent, of metal, and 18.7 of oxygen, the proportion of metal in the ore may be precifely afcertained by weigh¬ ing it. The other metals held in foluticn by the nitrous acid, which are chiefly lead, iron, copper and cobalt, may be feparated in the ufual way. Sect. II. Of the Reduction of the Ores of Bifmuth. The low degree of heat at which bifmuth is fufible, renders Chap. X. O U E Bifmuth. renders the reduction of tde ores of this metal a very Pimple procefs. In the treatment of the native metal, and the oxide, the weight ol the ore of black flux is put into a crucible along with it, covered with fait, to about a finger’s breadth, and melted for 5 minutes with a brilk fire : when it is cold, the bifmuth is found m a clean button. The flux employed by others is one part of borax, and the fame quantity of powdered glais,^ to two of the ore, and the fufion is effe&ed in a cruciole lined with charcoal. With the oxide, a little oil, rofin, or charcoal, fliould alfo be mixed. Previous roafting is neceflary in the treatment of the fulphuret of bilmuth, to feparale the fulphur *, the other part of the treatment is the fame with that now defcribed. But in the large way, the ores of biffnuth are redu¬ ced merely by heating them along with burning fuel. Sometimes a (hallow hole is made in the ground, and filled loofely with pieces of wood and buflies, and after the fire is kindled, the ore reduced to finally pieces is thrown in •, and fometimes the flump of a hollow pme tree is filled with wTood and ore alternately, and fet on fire 5 the bifmuth feparates from its matrix, and collecls in a mafs at the bottom. Chap. X. Of the Ores of Zinc. The ores of zinc are, the native carbonate, or com¬ mon calamine, the oxide of zinc, and the fulphuret. Sect. I. Analyfs of the Ores of Zinc. On account of the great volatility of zinc, it cannot be examined in the dry way, or fubjeded to affay, with¬ out particular precaution. In affaying blende,_ or the fulphuret of zinc, the ore, after being bruifed, is to be carefully feparated from particles of galena, or other impurities. It is then to be roafted, and the fulphur be¬ ing driven off, to be reduced to fine powder, mixed with half its weight of charcoal, introduced into an earth¬ en retort, to which a tube is fitted. I he retort being expofcd to a ftrong heat in a wind furnace, for three quarters of an hour, is to be gradually cooled, and on breaking it, the zinc is found in the neck, in metallic drops. The objeft may be accompliftied in another way. Prepare the ore as before, and having mixed it with charcoal, let it be ftratified in a crucible, with its own weight of copper clippings 5 and having luted on a perforated cover, fubject it for nearly an hour to a low white heat. Allow it to cool, and examine and wafh the contents. The globules of brafl formed are thus eafily feparated from the other impurities, and the excefs of weight of the brafs above the copper, indicates the quantity of zinc given out by the ore. Blende, or fulphuret of %inc.—This ore is. found to contain not only zinc and fulphur, but fometimes iron, lead, copper, and arfenic, with filica, alumina, and a portion of water. It may be analyfed by the following procefs : x. Introduce into a fmall coated glafs retort, 200 grains of ore reduced to powder, and let it. be gently ignited for a quarter of an hour. The fluid collected in the receiver will be found to be water. 2. Digeft another portion of ore in repeated quanti¬ ties of diluted nitric acid, till every thing foluble is ta- S, &c. ken up wafti the refidue } weigh and ignite it j the ^ lofs of weight indicates the quantity of fulphur which is burnt off. 3. Digeft the refidue in a little nitro-muriatic acid, till the infoluble portion becomes quite white, which is pure filica. 4. Add to the nitric folution (2.) a few drops of ful- phate of foda •, evaporate gently, and continue to add fulphate of foda while a precipitate is formed, and. after being evaporated nearly to drynefs, digeft in diluted muriatic acid 5 the fulphate of lead, remains behind. 5. Add together the nitro-muriatic folutions (3, 4..).$ decompofe by carbonate of foda, and digeft the precipi¬ tate in cauftic ammonia} the zinc and copper are thus diffolved. 6. Let the ammoniacal folution (5.) be faturated with muriatic acid , boil it, and add cauftic foda, while a precipitate takes place: this is the brown oxide of copper. 7. Oxide of zinc rtow only remains in the foda folu¬ tion, xvhich is to be faturated with muriatic acid, and decompofed by carbonate of foda. Ihe precipitate ob¬ tained after ignition is oxide of zinc. 8. The refidue which was infoluble in ammonia (5.), is to be treated repeatedly with nitric acid, and digefted in cauftic foda. Oxide of iron, contaminated (lightly with arfenic, remains infoluble. q. Having faturated the foda folution (8.) with nitric acid, add nitrate of lead, till no farther precipitate is formed } the precipitate is arfeniate of lead. jo. And to the refidual liquor, add firft, fulphate of foda, to feparate any nitrate of lead that may re¬ main } filter the liquor, decompofe it by carbonate of ammonia 5 the precipitate, wafhed and ignited, is pure alumina. Calamine, or carbonate of %ine.—The ores of this fpecies contain, befides the carbonate of zinc, the car¬ bonates of lead, iron, and lime. The following is the mode of analyfis. 1. The ore reduced to powder is to be diffolved in diluted nitric acid ; the lofs of weight during the folu- tion indicates the quantity of carbonic acid. Neutralize the folution with cauftic foda, evaporate gently, and add from time to time, a few drops 01 fulphate of loda while any precipitate is formed. 2. Having thus cautioufly brought it nearly to dry¬ nefs, digeft it in highly reflified alcohol, and afterwards in a little cold water, which will take up every thing but the fulphates of lead and lime. 3. Thefe may then be feparated by digeftion in ful- phuric acid very much diluted, which will take up the fulphate of lime, leaving the fulphate of lead pure. 4. Neutralize the muriatic folution by foda, and eva¬ porate nearly to drynefs j then add al cohol to the re¬ fidue, which will throw down the fulphate of lime with a little fulphate of foda, which latter may then be waffl¬ ed away by a little cold water. 5. The alcoholic folution (2.) after evaporation to drynefs, may be digefted in cauftic ammonia, which will take up the oxide of zinc, and leave behind the oxide of iron. 6. The alkaline folution, after being flightly fuperfa- turated with muriatic acid, is to be decompofed by a. perfefllv carbonated alkali, by which the zinc is pro- 3 K 2 cured 443 ^dnc. . \ 444 ORE Zinei cured in the ftate of carbonate; and this, after edulcora- v " tion, being diffolved by fulphuric acid, and the folution ignited in a platina crucible, affords dry fulphate of zinc, containing 50 per cent, of oxide of zinc. 7. Thus, all the conftituent parts are afcertained ex¬ cept the water: to determine the proportion of this, take a frefh parcel of the ore, weigh it, and then ignite it for half an hour, note the lofs of weight, and transfer the refidue into muriatic acid ; if while it diffolves in this fluid it gives out any gas, let the lofs of weight be noted ; then add together the Ioffes by ignition and folu¬ tion •, deduft from the fum the known weight of the' carbonic acid, and the refidue is water. Sect. II. Of the ReduElion of the Ores of Tjinc. The ore being reduced to fmall pieces, and the dif¬ ferent impurities being feparated, it is next calcined in a reverberatory furnace at a moderate red heat, and if the ore be calamine, the carbonic acid is driven off, and if blende, it is deprived of its fulphur. After this it is wafhed, and the metallic oxide being feparated from the earthy parts, it is dried, and carefully mixed with about one-eighth of its weight of charcoal, by grinding the ingredients together in a mill, and is now ready for the fmelting procefs. This is performed in a circular fur¬ nace, in which are fixed fix large earthen pots, about four feet high and nearly of the fhape of oil jars. An iron tube is inferted into the bottom of each pot, and, paffmg through the arched floor of the furnace, ter¬ minates in a veffel of water placed beneath, while the other end of the tube rifes within the crucible to a few inches of the top. The crucibles are then filled with the mixture of the ore and charcoal, to the level of the tube, the cover of each is carefully luted on, and an in- tenfe heat is to be kept up for feveral hours. The zinc, as the procefs of reduftion goes on, rifes in the form of vapour to the top of the pot, but as it cannot efcape, it defeends through the iron tube, paffes into the water, and is condenfed in fmall drops. The globules are after- wards fufed, and call into the form of ingots, when it is fit for the market. But as common zinc contains a little of other metals, as copper, lead, arfenic, iron, and manganefe, which impair its quality, thefe impurities are partially feparated by melting the zinc in a crucible, and ftirring into it, with a flick or earthen rod, a mixture of fulphur and fat; by the latter the zinc is preferved from oxidation, and the fulphur combines with all the other metals ex¬ cept the zinc, and converting them into fulphurets, they rife to the top in the form of fcoriae, which may be re¬ moved. This procefs is to be repeated as long as any fcoriae appear. The method of purifying zinc propofed by Proufl, is fimple diflillation in an earthen retort. The zinc paffes over, and the oxides of the other metals remain behind. But it is fuppofed that the arfenic or lead cannot be feparated in this way. Ghap. XI. Of the Ores of Antimony. Native antimony is a very rare production •, the moft common ore of antimony is the fulphuret j but it is alfo fometimes found in the ftate of oxide. S, 8tc. Chap. XI. Antimony. Sect I. Of the Analyfs of the Ores of Antimony, " V” Gray ore of antimony, or fulphuret of antimony.—As the fulphurets of antimony are the principal ores of this metal, we lhall only deferibe the procefs by which the analyfis of thefe pres may be conduced. 1. Five hundred grains being reduced to fine powder, are to be digefted with 1500 grains of pure nitric acid of fpecific gravity 1.25, and 1000 grains of water, for half an hour, at 150° Fahrenheit ; then add a quantity of pure water, equal to the reft of the thud 5 mix the whole well together, and pour off the liquor as foon as it becomes clear. This confifts of the nitrates of filver, lead, and copper, and perhaps a little iron diffolved in an excels of acid. By fimple boiling and filtration, the iron is feparated in the ftate of red oxide. 2. Add to the folution muriate oi ioda, while any precipitate takes place, and let the whole fland ftill the fupernatant liquor becomes clear ; the precipitate is pure muriate of filver. , 3. The folution (2.) is next to be faturated with pot- afh or foda, and concentrated by evaporation to one- third of its bulk. The addition of cauiiic ammonia in excefs thrown down the lead in the ftate of oxide, and the copper remains in folution. 4. Acidulate (lightly the folution (3.) with nitrous acid ; add carbonate of potaih, by which the green oxide of copper will be precipitated, and being fubjedled to a low7 red heat, is reduced to the ftate of brown oxide, of which 100 parts indicate 85 of metal. 5. The portion of ore (1.) which was infoluble, is next to be digefted at a degree of heat below boiling, with fucceitive portions of nitromuriatic acid, compofed of nitric acid, as long as any thing is taken up. The different folutions are then mixed, concentrated by eva¬ poration, and poured into a large portion of pure w7ater ; a precipitate immediately takes place, wbich is the white oxide of antimony, wbich, after being feparated and w7a{hed, is to be mixed writh twice its w'eight of crude tartar and a little nitre, and then expofed to a full red heat, which in a few minutes reduces it to the me¬ tallic ftate. 6. The folution (4.) contains now a little fulphuric acid and iron, wuth fome earthy matters. By adding nitrate of barytes while any precipitate is produced, the quantity of acid may be afcertained, and then adding cauftic potafh in excefs, wbich aflifted by a boiling heat, will precipitate the iron, and retain the alumina and fi- lica. 7. The infoluble refidue (6.) contains fulphur and earth •, it is decompofed by a red heat, the fulphur be¬ ing diflipated, and the earth remains. Sect. II. Of the ReduBion of the Ores of Antimony. The ore of antimony, wbich is found in fufficient quantity to be employed in the procefs of reduction in the lar ge way, is the fulphuret, the analyfis of which has now been detailed. The ore being feparated from the greater part of the ftony matters which adhere to it, is placed on the bed of a reverberatory furnace, and cover¬ ed with charcoal powder; and being brought to a low red heat, the fttlphuret enters into fufion, and the earthy. Chap. XT. ORE Antimony earthy parts floating on the furface, arc removed with a > rake. The melted part is call iuto the form of large cakes, and is the crude antimony of the (hops. The metal is obtained in a llate of purity from the crude antimony, or fulphuret, by different procefles The following is recommended as one ot the beL, and moft frequently praclifed. The fulphuret being redu¬ ced to fmall pieces, is ffrewed thinly on the floor ol a reverberatory furnace, to drive off the fulphur. _ 1 he heat at firft muff not exceed that of the melting point of tin, othervvife the antimony will melt. A lambent blue flame is obferved over the furface of the ore, which pro¬ ceeds from the combuftion of the fulphur j the metal is deprived of its luffre, and is converted into a grayifh oxide. In the courfe of fome hours, by carefully Itining the ore, and cautioufly increaflng the temperature, as the fufibility dimintihes, it at laft ceafes to give out ful- phureous vapours, and can bear a moderate red heat without melting. After the roafting, the ore is re¬ moved from the fire, and is found changed into an afti- gray oxide, weighing from 30 to 36 per cent, lets than the fulphuret, but it is not yet entirely free fiom ful¬ phur. To reduce the oxide, mix it with half its weight of crude tartar, and fubje£t to a full red heat in a cover¬ ed crucible. The oxide is decompofed by the carbona¬ ceous part of the tartar, and the antimony reduced to the metallic form, is collefted at the bottom of the cru¬ cible. A fmall proportion, however, ftill remains, dif- folved by the fulphuret of potafh formed by the alkaline bafe of the tartar, and the. fulphur of the oxide. The quantity of metal which is thus obtained in the large way, amounts to 66 or 70 per cent, of the oxide em¬ ployed. The lofs, however, would be greater, if the ore has not been properly roafted. The reduaion is effeaed alfo by another procefs, which is fuppofed to be more economical. The roafted oxide is mixed with oil or fat, and a little powdered charcoal, and then introduced into a crucible 5 and as the metal begins to appear, powdered nitre,, in the propor¬ tion of an ounce to a pound of oxide, is gradually in- iected, after which the whole mafs is brought to thin fufion, affording a pure metal, and in greater proportion than in the ufual way. The only other procefs which we fhall mention, for reducing fulphuret of antimony, is that by means of fome of the other metals, for which the fulphur has a greater affinity than for the antimony. Proceeding on this principle, iron, copper, lead, filver, and tin, may be employed in the procefs 5 but as iron is not only more effeftual, but alfo cheaper, it is preferred. The anti¬ mony obtained by this procefs, was formerly called martial regulus, not only on account of the iron being ufed in the preparation, but, not improperly, on account of a fmall portion of that metal which ftill adheres to it. The proportions recommended are the following : Eight ounces of fmall iron nails are heated in a crucible almoft to whitenefs •, 16 ounces of crude or roafted fulphuret of antimony,coarfely pounded, are then added: the crucible is covered, and the fire kept up •, and in a few minutes, when the whole is melted, three ounces of nitre are to be added *, after a flight detonation has taken place, the whole is brought to perfect fufion. It is then put into an iron cone previoufly heated and greafed, and as the mafs becomes folid, the fides of the cone are ftruck, to promote the precipitation, of S, &c. the metal. When cold and weighed, a mafs of an¬ timony is obtained, equal to about 10 ounces of the fni- phuret employed, covered with alkaline ferruginous fcorite, from which it is eafily feparated by a blow of the hammer. _ . But the metal is not yet entirely free from iron and \ fulphur j to purify it ftill farther, therefore, it is to be. remelted. Two ounces of crude antimony, and three of nitre being added, and when the detonation has ceafed, it is poured into a cone, and the metal is feparated as before, from tbe fcoriae. buie the metal again } project upon it three ounces of nitre j leparate the purified metal from the fcoriae remelt with a ftrong heat, pro- jetting gradually three ounces of nitre, anc immediately pour it into a cone. About eight ounces of a beautiful ftellated regulus, covered with yellovvith white leorite, are thus obtained. Chap. XII. Of the Ores of Cohalt. Cobalt exifts ufually in a ftate of combination with arfenic and fulphur, or in the ftate of oxide. Scarcely any of its ores are free from arfenic and iron. Nickel is alio fometimes abundantly mixed with the ores of co¬ balt, and occafionally a little rnanganefe and copper. Sect. I. Of the Analysis of the Ores of Cobalt. White and gray cobalt ores, confifting chiefly of ar¬ fenic and cobalt, may be examined in the dry way, ac¬ cording to the following procefs, which, however, is not to be confidered as very perfect. The ore is to be mix¬ ed with charcoal or fawT-duft, and roafted to drive off the arfenic. The oxide after calcination is mixed wuth four times its weight of an equal mixture of carbonate of potaih and tartar, and heated intenlely, at. the tem¬ perature which is required for melting caft-iron. .A button of metallic cobalt is found beneath the fcoriae, ■which are always of a deep blue, or nearly black colour, owing to the combination of part of the oxide of cobalt. A hundred grains of this ore, treated by Klaproth ac¬ cording to this procefs, yielded 44 grains of metallic cobalt; but if the ore contained iron, copper, or nickel, it muft have been alloyed with thefe metals, and perhaps nst entirely free from arfenic. But the analyfis may be conduced with more accu¬ racy according to the following procefs by Taffaert *. # Ann- de 1. With a view to afeertain the quantity of arfenic, C£m.xxvui. he digefted 100 parts of cobalt ore with diluted nitric P- 5>a* acid. ' The whole was diffolved in a few hours, and de- pofited on cooling, white cryftalline grains. By eva¬ poration more cryftals were depofited j the whole col¬ lected and dried, -weighed 56 parts, and excepting three parts, the whole was fublimed. Thefe 53 parts are oxide of arfenic, and indicate 49 Per cenri niotal in the ore. 2. Three hundred parts of the ore digefted with four times as much nitric acid, afforded a role-coloured folu- tion. After partial evaporation, and with the addition of water and heat, a pale-red precipitate- (1.) was formed, leaving a rofe-coloured folution. The folution being boiled with an excefs of potafh, afforded an oxide of cobalt, which was rofe-coloured, and then green, and when dried in a red heat, black. Ihe amount was •> 85 parts, a. Thefe- o 5* on ORE alt. 3. Tnefe 85 parts, dilToived in ni fro-muriatic acid, •gave, with the addition of pure ammonia, a black pre¬ cipitate, which, excepting a fmall portion, was again diffolved by an excefs of alkali. The undiffolved por¬ tion treated again with nitro-muriatic acid and ammo- ' nia, was reduced to four parts, and appeared to be oxide of iron. 4. The rofe-coloured precipitate (2.), which was a mixture of arfeniate of cobalt and iron, being decom- pofed by cauftic potalh in excefs, afforded a precipitate, which weighed, after being dried, 100 parts. 5. The 100 parts (4.) being again ditTolved in nitric acid, and the folution being partially evaporated, and then diluted with water, gave a precipitate of 27 parts of oxide of iron, and left a clear folution of cobalt. 6. The nitrate of cobalt (if.) was decompofed by am¬ monia ; and the precipitate rediifolved by an excefs of the alkali, excepting an infoluble oxide of iron, amount¬ ing to 15 parts. The folulion was then added to the ammoniated cobalt (3.). 7. The infoluble precipitates of oxide of iron (3. 5. and 6.) were then mixed and examined. With borax they gave a blue glafs, indicating a portion of co¬ balt dill combined. They wrere then diffolved in ni¬ tro-muriatic acid, precipitated by ammonia, and the wet precipitate was introduced into acetic acid, which at firft diffolved the whole, but by boiling and evaporation nearly to drynefs, four times fucceflively, the oxide of iron became infoluble, while the cobalt remained in fo¬ lution, and as it was more freed from iron, it affumed more of a fine rofe colour. The folution of acetate of cobalt was fuperfaturated with ammonia, and the folu¬ tion of ammoniated cobalt was added to the different portions of the fame, obtained in former experiments. To expel the ammonia, the whole folution was boiled, and by adding pot alb, the whole oxide of cobalt was precipitated, which being wafhed and dried, amounted to 133 parts. The oxide being reduced in a crucible lined with charcoal, afforded pure metallic cobalt, of fpecific gravity 8.538. 8. To determine the quantity of fulphur, 100 parts of the ore were feparately boiled with (;oo of nitric acid, and diluted with water, to feparate the whole of the oxide of arfenic that depofited fpontaneoufly. The ful¬ phur -was now converted into fulphuric acid 5 nitrate of barytes wTas added, and a precipitate of fulphate of barytes was formed, the quantity of which being afcer- tained, the proportion of fulphur might in this way be eftimated. Sect. II. Of the Reduciion of the Ores of Cohalt. As cobalt in the metallic Hate is not applied to any ufeful purpofe, the redudlion of its ores in this view is not an objecl of manufacture. Eut as it is extenfively employed in the Hate of oxide, to give a fine blue colour to glafs, porcelain, &c. we fiiall here give a fhort account of the method of preparing the ores for this purpofe. When the oxide cf cobalt is limply mixed, after calci- mation, with a quantity of vitrifiable earth, it is then known by the name of cined a fecond time, again ground, and paffed through a fine fieve. The powder is then mixed with two parts of powdered flint or quartz, after which it is moiftened, and packed into barrels, where it acquires a great degree of hardnefs. This is the zaffre of commerce, in the ftate in which it is exported 5 the exportation of the Ample coloured oxide being prohibited under heavy penalties, it is faid that the flints are added with a view to conceal the real nature of the fubftance. Preparation of Smalt.—This is alfo fometimes called zaffre, and when reduced to a very fine powder, it is called assure blue. It is prepared with about equal parts of calcified cobalt ore, potafh, and ground flints. This mixture is firft fritted, and afterwards made into glafs, in pots like thofe of the glafs-houfe. Eight or ten hours are required for its fufion. When the blue colour is perfect, the fufed matter is taken out with iron ladles, and dropt into cold water, which makes it crack in all dire&ions, fo that it is eafily reduced to fine powder. This operation is performed in a mill of very hard ftone, inclofed in a rvooden cafe. In the preparation of the fmalt by the above procefs, a portion of bifmuth, which ufually accompanies the ores of cobalt, is found. Above it there is alfo a mixed alloy of iron, copper, and ar¬ fenic. Chap. XIII. Of the Gres of Nickel. Nickel, as it is found in the ftate of ore, is ufually combined with arfenic and fulphur, copper and iron, or with oxygen^ in the form of oxide. Sect. I. Of the Analysis of the Ores of Nickel. When the ore contains, befide nickel, arfenic, ful¬ phur, copper, and iron, with which it is ufually ac¬ companied, cobalt, filver, and bifmuth, with fome earthy matters, the analyfis may be condufted according to the following procefs. 1. The ore being reduced to an impalpable powdfer, is to be two or three times digefted in nitric acid, con- fiderably diluted, after which every thing foluble will be taken up. During the procefs, nitrous gas is given out. 2. The infoluble part confifts moftly of fulphur and filica, which after being dried, -weighed and heated, the fulphur burns off, and the difference of weight before and after ignition, indicates its amount. The refidue, after boiling in a little nitrous acid, is pure filica. 3. Saturate the two nitrous folutions (1. and 2.) with pure Chap. XIV. O R E M-anganefe pure foda, evaporate confiderably, and pour the folution 'v ' into cold diltilled water ; the oxide of bifmuth is preci¬ pitated. 4. Add muriate of foda by drops to the filtered folu¬ tion, while any precipitate is formed, which is the muri¬ ate of filver. ' 5. Evaporate the folution nearly to drynefs, boil it with (trong nitric acid while nitrous gas is given out 5 red oxide of iron is precipitated during the procefs. 6. Remove the oxide of iron, faturate the liquor with foda, and add nitrate of lead while any precipitate takes place. This is the arfeniate of lead, which may be fe- parated by filtration. 7. Decompofe the nitrous folution by carbonate of foda : digeft the wathed precipitate in liquid ammonia *, the oxide of iron mixed with alumina, is left behind, and may be feparated by cauftic fixed alkali. 8. Let the ammoniacal folution be (lightly fuperfa- turated with nitric acid, and a poliihed bar of iron in¬ troduced 5 in this w ay the copper will be feparated : then decompofe the liquid by carbonate of foda, and di¬ geft the precipitate in ammonia, and the iron employed in feparating the copper will be removed. 9. The folution now contains only nickel and cobalt. Let it be evaporated till the excefs of ammonia be ex¬ pelled. This is the cafe when the vapour ceafes to dif- colour moift turmeric paper. Then add pure potalli or foda to the folution largely diluted, wdiile any precipi¬ tation takes place. The precipitate is the oxide of nickel. The cobalt now' only remaining in the folu¬ tion, may be feparated in the ufual wray. To reduce the oxide of nickel, mix it wdth glafs of borax and a fmall quantity of carbonaceous matter, and then fubjedft it in a crucible to the moft powerful furnace heat. A but¬ ton of pure nickel is thus produced. As the ores of nickel are not very abundant, and as this metal is little employed for purpofes of manufafture, the rediuftion of its ores does not extend beyond chemi¬ cal analyfis, which we have now detailed. Chap. XIV. Of the Ores of Manganfe. Manganese ufually exifts in the ftate of oxide, com¬ bined wfith a fmall proportion of iron, or in the ftate of carbonate, and fometimes in that of fulphuret. Sect. I. Of the Analysis of the Ores of Manganefe. Radiated gray ore of manganefe.—This ore was ana- lyfed by Klaproth according to the follow ing procefs. “ Two hundred grains of the ore, in grofsly broken cryf- tals, wrere heated to a thorough rednefs in a fmall coated glafs retort, connected wuth the pneumatic apparatus. The gas colle&ed amounted only to nine grains, upon deducing the common air of the apparatus ; but (hewed by the lively combuftion of an iron ware confined in it, that it was pure oxygen gas. “ 2. In the fmall intermediate hollow glafs-fphere of the apparatus, a confiderable quantity of moifture has condenfed, which weighed 14 grains, and w’as pure wa¬ ter. “ 3. The manganefe, having fuftained that ignition, weighed 181 grains. The external luitre of the cryftals was very much diminiftied, and their gray colour turned biackifh. S, &C. 447 « One hundred parts of this ore have, confequently, Manganefe. been decompofed into, Black oxide of manganefe, 90-5° Water, 7- Oxygen gas, 2.25 00.7 ? * EJFays> ‘J 11. 245. As manganefe is chiefly employed for economical pur¬ pofes, in the ftate of oxide, the reduction of its ores forms no object of manufacture. Chap. XV. Of the Ores of Molyhdena. For an account of the treatment of the ores of moly- bdena, which exifts in the ftate of fulphuret and in that of oxide only, fee Chemistry 3. fee alio the analyfis of the molybdate of lead, in the chapter -on lead, in this article. Chap. XVI. Of the Ores of Arfenic. Arsenic is found native, when it is alloyed with a fmall portion of iron, and fometimes al(b with a little gold or filver 3 in the ftate of (ulphuret, or in the ftate of oxide. Sect. I. Of the Analyfis of the Ores of Arfenic. The method of analyfing the ores of arfenic by Berg¬ man, has been already given under Arsenic in the article Chemistry, as well as the method of fubliming the metal in clofe veffels, to obtain it in a ftate of purity. The following is recommended as a fuccefsful procefs for preparing this metal for nice chemical purpofes. • Mix a quantity of arfeniate of potafti with about part of charcoal, and let it be fublimed in a clofe glafs vef- fel, flowly heated to rednefs. The metallic arfenic thus obtained is in the form of beautiful brilliant cryftals. Sect. II. Preparation of White Arfenic and Orpiment, White arfenic.—In the large way, this is prepared, by roafting the arfenjcal ores, previoufly ground to powder, and mixed with charcoal or faw dull, at a low red heat for feveral hours. The roafied ore is then , fubjefted to a fecond fublimation, according to the fol¬ lowing method 3 which is practiied in Bohemia. The veffels in which the fublimation is performed, are ftrong fquare boxes of call iron furniftied with conical heads, which are clofely luted with clay. Thefe boxes are ar¬ ranged in a fpacious brick area, which is heated by flues proceeding from two furnaces, placed a little be¬ low them. "W hen the impure arfenic has become red- hot, it is removed into the boxes by 15 pounds at a time, where it is brought into fulion, and about an hour after begins to fublime into the conical head. When the ar¬ fenic ceafes to rife, another quantity is introduced into the veffel, and treated in the fame way. Thefe additions - are continued till about 150 pounds of arfenic have been thus treated in each veffel 3 a period of about 12 hours is requifite for the fublimation of the whole quantity. When^the veffels are cold, the conical head is taken off, and the fublimed arfenic is broken off with hammers, at the fame time any impurities that adhere to it are fe¬ parated, for a fecond operation. Orpiment,—-*’ - 448 O Pi E -Arfenic. Orpimcnt.—This fubftance is prepared in the fame “v ' manner, and with the fame apparatus, but the arfenic is previoufly mixed with half its weight of fulphur. In both cafes a uniform red heat fhould be kept up during the operation, fo that the materials in the lower veffel may be always in fufion ; and when thefe materials are of any tolerable degree of purity, almolt the whole is fublimed. S, &c. Chap. XVI. As the remaining metals have yet been found only in very fmall quantity, the reduction of their ores is not an obje£t of much importance. A Ihort account of the method of analyfing them will be found under Che¬ mistry, and the characters of the ores, with their con- ftituent parts, will be found under Mineralogy. For the account of an elaborate analyfis of the ores of tellurium, fee Klaproth’s Effays, ii. I. ORE ORELLANx\, Francis, the firft European, as is commonly thought, wdio difcovered the river of the Amazons. In 1539, he embarked near Quito, upon the river Coca, rvhich farther down takes the name of Napo. From this he fell into another large river ; and, leaving himfelf entirely to the direction of the current, he arrived at Cape North, on the coaft of Guiana, after failing nearly 1800 leagues. Orellana perilhed 10 years after, with three veffels which had been intruded to him in Spain, without being able to find again the mouth of this river. In failing dowm the river, he met with fome armed wo¬ men, againft whom an Indian cacique had told him to be on his guard; and he thence named it the river of the Amazons. ORENSE, an ancient town of Spain, in the king¬ dom of Galicia, with a bilhop’s fee, famous for its hot baths, is feated at the foot of a mountain, on the river Minho, over which there is a handfome bridge of one arch. W. Long. y. 27. N. Lat. 42. 16. ORESTES, In Ancient Hi/lory, a fon of Agamem¬ non and Clytemneftra. When his father was cruelly murdered by Clytemneftra and iEgifthus, young Oreftes was faved from his mother’s dagger by means of his fifter Eleftra, called by Homer Loadicea, having been privately conveyed to the houfe of Strophius, who was king of Phocis, and who had married a fifter of Aga¬ memnon. He was tenderly treated by Strophius, who carefully educated him with his fon Pylades. The two young princes foon became acquainted, and from their familiarity arofe the moft inviolable attachment and friendlhip. When Oreftes came to years of difcretion, he vifited Mycenae, and avenged his father’s death by affaffinating his mother Clytemneftra and her adulterer /Egiithus. Various accounts are given of the way in ■which thefe murders wTere committed. After their commiflion, however, he v7as acknowledged king of Mycenae •, but being tormented by the Furies, a punifti- ment wrhich the ancients always thought followed parri¬ cide, he exiled himfelf to Argos, where he was ftill pur- fued by the vengeful goddeffes. Apollo, however, puri¬ fied him, and he was acquitted by the unanimous opinion of the Areopagites, whom Minerva herfelf inftituted on this occafion, according to the narration of the poet iEfchylus, who flatters the Athenians in his tragical ftory, by reprefenting them as paffing judgement even upon the gods themfelves. According to Paufanias, Oreftes was purified of the murder, not at Delphi, but at Trcezene, where ftill was feen a large ftone at the entrance of Diana’s temple, upon which the ceremonies ■of purification had been performed by nine of the prin¬ cipal citizens of the place. There was alfo at Megalo- 2 ORE polls, in Arcadia, a temple dedicated to the Furies, near which Oreftes cut off one of his fingers with his teeth in a fit of infanity. Thefe different traditions are con¬ futed by Euripides, who lays that Oreftes, alter the murder of his mother, confulted the oracle of Apollo at Delphi, where he was informed that nothing could de¬ liver him from the perfecutions of the Furies, if he did not bring into Greece Diana’s ftatue, which was in the Taurica Cherfonefus, and which, as it is reported by fome, had fallen down from heaven. I his was an ar¬ duous enterprife. The king of Cherfonefus always fa- crificed on the altars of the goddeis all fuch as entered the borders of his country. Oreftes and his friend were therefore both carried before Thoas the king of the place, and they were doomed to be facrificed. Iphige- nia, Oreftes’s fifter, was then prieftefs of Diana’s temple, and it was her office to immolate thefe ftrangers. The intelligence that they were Grecians delayed the prepa¬ rations, and Iphigenia was anxious to learn fomething about a country which had given her birth. She even interefted herfelf in their misfortunes, and offered to fpare the life of one of them, provided he would convey letters to Greece from her hand. 1 his was a difficult trial : never was friendlhip more truly difplayed, ac¬ cording to the words of Ovid, ex Pont. 3. e/. 2. Irejubet Pylades carum moriturus Orejlem. Hie negat; inque viceni pugnat uterque mon. At laft, however, Pylades gave way to the preffing in¬ treaties of his friend, and confented to carry the letters of Iphigenia to Greece. Xhefe were addreffed to Oreftes himfelf •, and therefore thefe circumftances foon led to a dilcovery of the connexions of the prieftefs with the man whom {he was going to immolate. Iphigenia was con vinced that he was her brother Oreftes; and when the caufe of their journey had been explained, fhe herfelf re- folved with the two friends to fly from Cherfonefus, and to carry away the ftatue of Diana. Their flight was difcovered, and Thoas prepared to purfue them j but Minerva interfered, and told him tnat all had been done by the will and with the approbation of the gods. Some imagine that Oreftes came to Cappadocia from Cher¬ fonefus, and that there he left the ftatue of Diana at Comana. Others contradiX this tradition j and Pau¬ fanias thinks that the ftatue of Diana Orthia was the fame as that which had been carried away from the Cherfonefus. Some again fuppofe that Oreftes brought it to Aricia in Italy, where Diana’s worfhip was eftab- lifhed. It was after this that Oreftes afeended the throne of Argos, where he reigned in perfeX fecurity, married Hermione the daughter of Menelaus, and gave his fifter Oreftes O R F [ 449 1 to his friend Pylades. The marriage of Oreftes with not be any Hermione is alfo a matter of difpute among the ancients. Orflfyreus’s All are agreed that (he had been promifed to the fon of Wheel. Agamemnon 5 but Meneiaus had married her to Neo- ptolemus the fon of Achilles, who had thown himfelf fo truly interefted in his caufe during the T rojan war. I he marriage of Mermione with Neoptoremus difpleaied Orel- tes j he remembered that (he had been early promifed to him ; he was therefore determined to recover her by force or artifice. This he did by procuring the affaffination of Neoptolemus. According to Ovid’s epiftle of Her¬ mione to Oreftes, Hermione had always been faithful to her firft lover, and even it was by her perfuafions that Oreftes removed her from the houfe of Neoptolemus, for ftie was diflatisfied with the partiality of Neoptolemus for Andromache, and her attachment for Oreftes was increafed. There are, indeed, various opinions likewife about this : he, however, certainly managed to fecure her affeftions, and retired to his kingdom of Argos. His old age was crowned with peace and fecurity, and he died in the 90th year of his age, leaving his throne to his fon Tifamanes by Hermione. Three years after, the Heraclidae recovered the Peloponnefus, and banifii- ed the defeendants of Meneiaus from the throne of Argos. Oreftes died in Arcadia, as fome fay, by the bite of a ferpent : and the Lacedemonians, who had become his fubjefts at the death of Meneiaus, were di- redled by an oracle to bring his bones to Sparta. They were fome time after difeovered at Tegea, and his ftature appeared to be feven cubits, according to the traditions mentioned by Herodotus and others. The friendfhip of Oreftes and of Pylades became proverbial: and the two friends received divine honours among the Scythians, and were worfhipped in temples. ORFA, a confiderable town of Diarbeck (anciently Mefopotamia) in Alia, very pleafantly fituated, and well fortified. It formerly belonged to Perfia; but is now in the Turkilh dominions, and is a place of very good trade. It has a ftately caftle Handing on a hill, which makes a great fhow at a diftance. They pretend to fliow the well where Rachel watered her father’s camels when Jacob met her, and they call it Abraham's well. E. Long. 37. 45. N. Lat. 36. 20. ORFFYREUS’s Wheel, in Mechanics, is a machine fo called from its inventor, which he afferted to be a perpetual motion. This machine, according to the ac¬ count given of it by Gravefande, in his Oeuvres Philofo- phiques, publilhed by Allemand, Amft. 1774, con- fifted externally of a large circular wheel, or rather drum, 12 feet in diameter, and 14 inches deep; being very light, as it was formed of an affemblage of deals, having the intervals between them covered with waxed cloth, to conceal the interior parts of it. The two extremities of an iron axis, on which it turned, refted on two fupports. On giving a flight impulfe to the wheel, in either direc¬ tion, its motion Avas gradually accelerated ; fo that after two or three revolutions it acquired fo great a velocity as to make 25 or 26 turns in a minute. This rapid motion it actually preferred during the fpace of tAvo months, in a chamber of the landgrave of Hefle, the door of Avhich was kept locked, and fealed with the landgrave’s own feal. At the end of that time it was flopped, to prevent the wear of the materials. The profeflbr, \A7ho had been an eye-witnefs to thefe circumftances, examined all the external parts of it, and was convinced that there could Vol. XV. Part II. O R G communication betAA~een it and any neigh¬ bouring room. Orffyreus however Avas fo incenfed, or pretended to be fo, that he broke the machine pieces and wrote on the A\*all, that it wras the impertinent curiofity of Profefior Gravelande which made him take this ftep. The prince of Heffe, who had feen the inte¬ rior parts of this Ardieel, but fworn to lecreiy, being afked by Gravefande, whether, after it had been in mo¬ tion for fome time, there Avas any change obfervable m it, and whether it contained any pieces that indicated fraud or deception, anfwered both queftions in the ne¬ gative, and declared that the machine was of a very Ample conftruction. ORFORD, a toAvn of Suffolk in England, 88 miles from London, fituated between two channels, where the river Ore, after having joined the Aid, falls into the fea. It was once a large populous town, with a caftle ; of which, and of a nunnery near the quay, there are Hill fome ruins. The towers of the caftle and its church are a fea-mark for colliers, coafters, and fliips that come from Holland. There is a light-houfe at Orford-Neffe, which is alfo of great ufe to feamen, and is a fhelter for them wdien a north-eaft wind blows hard upon the ftiore. The town Avas incorporated by Plenry III. has a mayor, 18 portmen, 12 chief burgeffes, a recorder, a tOAA'n- clerk, and Iavo ferjeants at mace. Though it fent mem¬ bers to parliament, in the 26th of Edward I. yet it had no more ele£iions till the reign of Edward IV. It ftill fends two members to parliament, and has the title of an earldojn. There are ftill remaining the ruins of an holy houfe Avhere the feamen’s wives ufed to pray for the fafety of their huthands. By the AvithdraAving of the fea, it has been deprived of its ch’ef advantage, for it noAV deferves not the name of a harbour. It had the honour to give title of earl to the brave admiral Ruffel, which, after being many years extinft, Avas revived in the perfon of Sir Robert Walpole. E. Long. 1. 46. N. Lat. 52. 15. ORGAL, among dyers, denotes the lees of wine dried. ORGAN, in general, is an inftrument or machine defigned for the produ&ion of fome certain aflicn or operation ; in which fenfe the mechanic powers, ma¬ chines, and even the veins, arteries, nerves, mufcles, and bones of the human body, may be called organs. Organ, in Mujic, denotes the largeft and moft har¬ monious of all wdnd-inftruments ; on which account it is called the organ, o^yxvov, the inftrument, by Avay of excellence; chiefly ufed for playing a thorough bafs, wdth all its accompaniments. That organs are the invention of remote antiquity has been argued, and feems now to be generally al- kwed ; but the particular time and country in wdiich the difeovery Avas made appears to be loft amidft the ruins of time. In ancient authors there are a variety of paffages Avhere mention is made of the organ, but it is at leaft poflible that an inftrument is meant very different from that which now goes by the fame name. From St Auguftin’s commentary on the 4th verfe of the 150th Ffalm we learn, that the Greeks had ano¬ ther name for thofe inftruments in which belloAvs A\Tere employed ; that the name organ Avas appropriated to this particular inftrument merely from the ufage of the Latin tongue •, and that it was indifferently given to all inftruments ufed to accompany the voice in con¬ cert. We mention this, not becaufu Ave doubt of the 3 L antiquity Orford 1! Organ. O R G [ 450 I O R G Organ, antiquity of the organ, but merely to ihow that the IT'' time of its invention cannot be determined by the era of the authors where its name occurs. As the fol- Gent. Mag. lowing obfervation, extracted from a periodical work W'hich has long been in deferved efteem with the pub¬ lic, are intended to afcertain its early ufe, we fubmit them, without commentary, to the judgement of our headers. Caffiodorus has deicribed our organ in a few words, lib. 1. Epil. 45. Praifing that art, which makes Organa extraneis vocibus infonare, et peregrinis jlatibus complete ut mujica pojjit arte cantare. And the emperor Julian has given air exadt defcription of it in an epigram, which may be found in the Anthologia, b. i. ch. 86. In his time thefe inftruments were in fuch requefl, that Ammianus Marcellinus, b. xiv. ch. 6. complains that they occafioned the ftudy of the fciences to be abandoned. However, thofe mufical inftruments whofe melody is produced by wind, had been known at Rome long before. Witnefs that agreeable poem of Capa, which for its ele¬ gance has been afcribed to Virgil *, where we find that the mufician introduces the wind into her pipes by means of a pair of bellows, which {he holds under her arms and blows. In the hydraulic organ, the water moves the air, inftead of bellows. Cornelius Severus, in his JEtna, has given an exadf defcription of it (a). And though there were two kinds of hydraulic and pneumatic inftruments, the firft of which played by the infpiration and action of bellows, and the other by the action of water, it is cer¬ tain, neverthelefs, that both of them were pneumatic, being infpired by the wind. And Heron of Alexandria, in his Pneumatics, has treated of hydraulics as belonging to pneumatics. This Heron lived in the time of Ptolemy Euergetes, king of Egypt. When Suetonius fays, that Nero Organa Injdraulica novi et ignoti generis circum- duxit, he did not mean that they were unknown at Rome before Nero, but that thofe of Nero were of a new con- ftruftion. Thofe were the hydraulics of a new fabric, which he exhibited to the people at the public games, a.s Suetonius relates a little after. Heliogabalus, one of the worthy fucceflbrs of Nero, like him was fond of thefe hydraulics; and Alexander Severus, his coufin and fucceffor, had the fame inclination. Claudian, who Organ, lived fome time after, has left us this elegant defcription- * ~ of them : Et qui magna Uvi detrmiens murmura taciu Innumeras voces fegetis moderator aetnc ; Intonet erranti digito, penitufque traba/i Vecie iaborantes in carmina concitat undas. This very conftruclion which is obferved in the pipes of an organ, gradually decreafing in magnitude, has been reprefented in an epigram of Optatianus Porphyrius, who lived in the time of Conftantine. This epigram, which is quoted in Pillion’s colle£lion of ancient epigrams, is compofed of verfes of an unequal length, fucceffively in- creating. This correfponds with thofe words of the old 5 fcholiaft on Juvenal, fat. 8. ver. 270. Tunica Galli utuntur in facris in modurn organi utrinque decrefcentibus mrgu/is purpureis. On the whole, then, the antiquity of organs, or of inftruments of a very fimilar nature, can fcarcely be difputed j but nothing very particular refpecfing the time, place, or manner, of the invention can pothbly be determined from thofe incidental obfervations which oc¬ cur in the writings of the ancients (b). It appears indeed to have been borrowed by the Latins from the Greeks, but not to have been in general ufe till the eighth cen¬ tury ; and it has been affirmed, that, in France, it was not known till the time of Louis le Debonair, i. e. A. D. 815. when an Italian prieft taught the ufe and conftruftion of it, which he himfelf had learned at Con- ftantinople. By fome, hovrever, it has been carried as far back as Charlemagne, and by others as far as Pepin. Bellarmine fays that the organ began to be ufed in the fervice of the church about the year 660, as Platina re¬ lates out of the Pontifical: for when Pope Vitalian re¬ formed the finging of the Roman church, he added to it organs in order to fupport and embeliffi it. Amraonius thinks, however, that this happened after the year 820, in the time of Louis the Pious. Perhaps the learned Bingham is our fureft guide in determining this point. He pofitively afferts f that there vrere no fuch things astOxmiNES organs ^acra- (a) Which is thus tranflated by Mr Jabez Hughes : As in an organ *, firft the ruffiing air * Organa* A mafs of waters does before it bear 5 And then the waters, in their turn, we find Drive through the hollow pipes the vanquifh’d wind 5- Which ftrongly from its ftrait confinement fent, Comes loudly rattling through the narrow vent; Still as the waters prefs, the fpirits found, And fpread the bubbling fymphony around. So air and water meet, &c. It is by no means certain that Cornelius Severus was the author of this poem, though it is publifhed under his name by Le Clerc. Seneca’s authority, on which the Younger Scaliger founds his opinion, enforces no fuch con- clufion. He only fays, that “ Severus was not difeouraged from writing on this fubjeff, by its having been already treated by Ovid and Virgil.” Barthius, in his notes on Claudian, refers it to Manilius, and in his Adverfaria to fome Chriftian writer. By others it has been afcribed to Virgil, and by Scaliger, the father, to Quintilius Varus. But though it is lefs clear and methodical than Virgil, and though it has been much mutilated by time, it certainly was penned by a mafterly and truly poetical hand. (b) Vitruvius deferibes an organ in his loth book, and St Jerome mentions one with 12 pair of bellows which might be heard a thoufand paces, or a mile; and another at Jerufalem which might be heard at the Mount of Olives. O II G [ 4, Organ, organs in ufe in the ancient church ; and that though —v ■ church-mufic was as old as the apoitles, indrumental muiic was not lb. He alfo fays that it was the general opinion of the learned in his days, that organs were not introduced into churches till after the time of Ihomas Aquinas, A. D. 1250; and for this opinion, as far as the authority of Aquinas will go, we have a poiitive proof j tor in his lums we find thefe words: “ Our church does not ufe mulical inftruments, as harps, and pfalLries, to praife God withal, that ihe may not feem to Judaize (c).” From hence it has reafonably been * Bingham concluded, particularly by the learned Gregory *, that uli fup ret they were not uled in churches in his time. Mr Whar¬ ton has alfo obferved that Marinas Sonatas (who tlou- nthed A. I). 1290) fiiil introduced wind-organs into churches ^ from this circumitance he derived the namh Tone 1/us, ihe name for organ in the Italian language. About this lame time Hurandus in his Rationale fpeaks ol them as generally received in the church} and he, in Ivlr Gregory’s opinion, is the firft author who takes notice of it. Thefe authorities are ftrong, and the opinions founded on them by the learned render them itill more convincing: it appears, however, from the teitnnony of Gervas the monk of Canterbury, who Hounihed A. D. 1200, that organs were introduced upwards of 100 years even before that time ; for in his defeription of Lanfranc’s church, as it was before the fire in 1174, he has thefe words, “ Crux aujlra- lis fupra fornicem organa gejiare folebat.'1'1 We do not fay that this invalidates the reafoning of the learned .Bingham •, of that our readers are to judge, and in form¬ ing their judgements they will be determined by the credit of the teifimonies which are here oppofed to each other. If we fuppofe that of Gervas the llrongeft, and in oppofition to the other conclude from it, that organs were introduced into England long before the 13th cen¬ tury, it will give fome countenance to an opinion which prevails pretty generally, viz. that in Italy, Germany, and England, they became frequent about the 10th century. See Music, p. 493* however we are dil- pofed to determine this matter (which is in itfelf but of little confequence), it is certain that the ufe of the organ was very common in the latter ages of the church, and the propriety of it was undifputed. In the laft century, however, during the civil wars, organs were remo¬ ved from the churches in England ; and lo gene¬ rally reprobated, that, at the Reftoration, there could fcarce be found either organifts, organ builders, or , fingers (d). The organs in Germany (fays Dr Burney) in mag- ;i ] O R G nitude, and the organifts in abilities, feem unrivalled Organ. , in any other part of Europe, particularly in the ufe of “ v pedals. In Marpurg’s Elfays, vol. iii. there is a mi¬ nute account of a variety of organs in Germany •, of all which the longeft pipe of the manuals is 16 feet long, and of the pedals 32'. One of the large!! or¬ gans in Germany, but which Marpurg has omitted in his lift, is at Gorlitz in Upper Lufatia. It would be to no purpofe to enlarge our article with a more minute account of the ftate of organic mufic in dif¬ ferent parts of the world j in various parts of the ar¬ ticle Music, obfervations conn eft ed with this fubjeft will be found, and to that we muft refer. We may particularly notice, for the perufal of thofe who wi!h for further information on this fubjeft, the obferva¬ tions which have been made on organs in the Hi- Jlory of Music, at p. 493. We need fcarcely refer to the life of Handel, which all our readers who are fond of mufic of any kind, particularly facred, have un¬ doubtedly perufed. , The church-organ confifts of two parts \ the main body, called the great organ; and the poutive or little organ, which forms a {mail cafe or buffet, commonly placed before the great organ. The fize of an organ is generally expreffed by the length of its large!! pipe : thus they fay, an organ of 8, 16, 32 feet, &c. The organ in the cathedral church at Ulm in Germany is 93 feet high and 28 broad : its large!! pipe is 13 inches diameter, and it has 16 pair of bellows. The feveral parts of the church-organ are as follow. Plate HIH is the found-board \ which is compofed of two CCCXCL parts, the upper board or cover HHH, and the under *’ board HI, which is much thicker than the other j each of thefe confiils of feveral planks laid with their edges to each other, and joined very clofe together. In the under fide of the lower board there are made feveral channels, which run in the direftion LL, MM, &c. and are continued as far as there are flops in the organ, and come almoft to the edge HK. Thefe channels are covered over very clofe with parchment or leather all the way, except a hole that is commonly at the fore-end next HK, upon which a valve or puff is placed. Thefe channels are called partitions. When this valve or flap is {hut, it keeps out the air, and ad¬ mits it when open. On the upper fide of the lower board there are likewife cut feveral broad fquare chan¬ nels, lying crofs the former, but not fo deep as to reach them ; thefe lie in the direftion LN, PQ, &c. To fit thefe channels, there are the fame number of wooden Aiders or regifters /,/,/, &c. running the 3 L 2 whole (c) The lawfulnefs of ufmg organs in churches, has, however, been ably defended by an appeal to the ufe which the Jews made of inftruments of mufic in divine fervice y and with much reafon } for were the ule criminal in us, a* was afferted by many well-meaning men of the laft century, and as it is ftill thought by fome in this, it would un- queftionably have been equally unlawful for the JewTs. The Chriftians in Aquinas s time, however^afted wifely in avoiding the ufe of them, if by fo doing they would have given offence to their weaker brethien. For though they are highly ornamental, and in fome churches may be productive of good effefts, yet the ufe of them is far from being effential, and may be eafily difpenfed wdth. . . (d) Organs have never yet been ufed in the eftabliftiment of Scotland, ftnee that became Prelbytenan ; but they are ufed in Holland, where that form of church-government alfo obtains. Bifhop Horne, in a fermon which he preached at the opening of the new organ at Canterbury in 1784, fays that he believes lome Preibyterian diffenters in England have adopted it in their places of worftup. See his Sermon, page 8. O K G ' [ 4i ■whole length •, and thefe may be drawn out or thruft in at pleafure. The number of thefe is the fame as that of the flops in the organ. IKKK is the wind-cheft, which is a fquare box fit¬ ted clofe to the under fide of the lower board, and made air-tight, fo that no air can get out but what goes through the valves along the partitions. VV are the valves or puff’s which open into the wind- cheft ; they are all inclofed in it, and may be placed in any part of it, as occafion {hall require. One of thefe valves, with the fpring that fhuts it, and the wire that opens it, is reprefented by fig. 2. C, D, E, F, &c. are the keys on which the fingers are placed when the organ is played : thefe keys lie over the horizontal bar of wood W, in which are ftuck an equal number of wire-pins z, z, on which keys are fixed 5 and the keys move up and down on the bar, as on a centre. There is another bar, againft which the keys fall when put down, and which is here mark¬ ed 3 : on this alfo are feveral wires, which go through the keys, to guide them •, and on this bar a lift is fa- flened to hinder the keys from knocking againft the wood. The keys are made to communicate with the valves feveral ways, as wre {hall now defcribe. Firft, r, s, s, are the key-rollers, moving on the pivots t, t: thefe rollers lie horizontally, one above another, and are of fuch a length as to reach from the valve to the key : a, a, a, are arms or levers fixed to the key-rollers : *io, wy the valve-wires fixed to the arms a, a, and to the valves V, and go through the holes h, h, in the bot¬ tom of the wind-cheft : b, L, by are likewife arms fixed to the key-rollers : d, d, the key-wires, fixed to the arms b, by and to the keys C, D, E. Now, when the end of any one of the keys C, D, E, is put down, it pulls down the arm b, by the w’ire d, which turns about the roller r with the arm a, that pulls dowm the wire iUy which opens the valve that is (hut by the fpring as foon as the preffure is taken off the key. In this con- ftruftion there muft be a wTorm fpring faftened to the key, and to the bar W on the further fide, to keep down the end 5 of the key. Another method of opening the valves is thus : x yy x y, are {lender levers, moveable on the centres 1,1$ 5 x, 5 x, are wires going from the further ends of the keys to the ends x of the levers; y V, y V, are other wires, reaching from the ends y of the levers, through the holes b, to the valves V. So that putting down the key C, D, &c. raifes the end 5, which thrufts up the end x of the lever, by the wire 5 x; this depreffes the end y of the lever, which pulls down the wire y V, and opens the valve V. A third way of opening the valve is this: At the end of the key by is a lever 8, 9, moving in the centre 7. This makes, with the key, a compound lever. From the end 9, a wire goes to the valve. Now the pitting down the end 6 of the key, raifes the end 8, «drich depreffes the end 9, of the lever 8, 9, pulls down the wire, and opens the valve. There is only one of thefe drawn in the fcheme, and but a few of the others, to avoid confufion. R, R, are the rollers, to move the Aiders, by help of the arms c f, cfy which are fixed horizontally in thefe rollers : k eyk e, are alfo levers fixed in the rollers} /*>,/, being drawn out, pulls the end e towards /, which turns about R along with the arm cf; and the end f pulls cut the Aider fg; and when p is thruft in, the arm cf likewife thrufts in the Aider Upon the feveral rows of holes which appear on the top of the upper board, there are fet up an equal num¬ ber of rows of pipes. The pipes of an organ are of two kinds j the one has a mouth like a fiute, the other with reeds. The firft, called pipes of mutatiotiy confift, (1.) of a foot A ABB (fig. 3.), which is a hollow cone, that receives the wind that is to found the pipe : (2.) To this foot is faftened the body of the pipe BBDD. Betw’een the foot and the body of the pipe is a diaphragm or partition FEE, that has a long but narrow7 aperture, by which the wand comes out; over this aperture is the mouth BBC, whofe upper lip C, being level, cuts the wind as it comes out. The pipes are of pewter, of lead mixed with a twelfth part of tin, and of wood. Thofe of pewter are always open at their extremities: their diameter is very {mail, and their found very clear and AirilL Thofe of lead mixed with tin are larger •, the ftiorteft are open, the longelt quite flopped 5 thofe of a mean fize are partly flopped, and have befide a little ear on each fide the mouth, to be drawn clofer or fet further afunder, in order to raife or lower the found. The wooden pipes are fquare, and their extremity is flop¬ ped wbth a valve or tampion of leather. The found of the wrooden and leaden pipes is very foft 5 the large ones flopped are commonly of wood, the fmall ones of lead. The longeft pipes give the graveft found, and the fhorteft the moft acute : their lengths and widths are determined by a fixed proportion to their founds *, and their divifions are regulated by a rule, which is called the diapafen. The longeft has common¬ ly 16 feet j but in very large organs it has 32 feet. The pedal tubes are always open, though made of wood and of lead. Whatever note any open pipe founds, when its mouth is flopped, it will found an oftave kwer; and a pipe of twice its capacity will likewife found an ottave lower. A reed-pipe confifts of a foot AABB (fig. 4.), that carries the wind into the fliallot or reed CD, which is a hollow demi-cylinder, fitted at its extremity D, into a fort of mould, by a wooden tampion G. The Aiallot is covered with a plate of copper KKLL, fitted at its ex-, tremity II, into the mould, by the fame wooden tam¬ pion. Its other extremity KK is at liberty : fo that the air entering the Ihallot makes it tremble or ftiake againft the reed *, and the longer that part of the tongue 1L, which is at liberty, is made, the deeper is the found. The mould II, that ferves to fix the ftiallot or reed, the tongue, tampion, &c. ferves alfo to flop the foot of the pipe, and make the wind go out wholly at the reed. Laftly, in the mould is foldered the tube HH, whofe inward opening is a continuation of that of the reed : the form of this tube is different in different ranks of pipes. The degree of aculenefs or gravity in the found of a reed pipe, depends on the length of the tongue, and that of the pipe CK, taken from the extremity of the ftiallot to the extremity of the tube. The quantity or intention of the found depends on the width of the reed,. the V\. r ’c 9 f ,-r'. C) K G A N . Plate C C CXCI. Oryan. J'ate 0 Pi G [ 453 3 the tongue, ?.nd the tubeas alfo on tne tnicKnefs of oclaves the tongue, the figure of the tube, and the quantity of wind. To diverfify the ibunds of the pipes, a valve is added to the pon-vent, which makes the wind go out in fits or (hakes. lit fig- I • X reprefents a ilute- pipe of wood, Z a flute-pipe of metal, Y a tiumpet- pipe of metal. The pipes, to prevent them fiom ±all- ing, pdfs through holes made in boards, placed upon the upper board. _ _ The pipes are made to communicate with the wmd- cheft in the following manner. There are holes bored that go through the upper and lower boards, and through the (lider (when it is drawn out), into the partition below ; fo that any pipes placed, upon thole holes will then communicate with the partition, which by its valve, communicates with the wind-chell. But when the (hder is thruft in, its holes do not anfwer to thofe in the upper and lower boards •, therefore, tne com¬ munication is (lopped, fo that no wind can get to the pipe. To everv large organ there mud be at lead tv\ o pair of bellows, which are marked in fig. i. by. IU, i(J. O, O, are the handles, moving upon the axis n n, n n, ■ Each of thefe bellows confidls of two boards,, the low¬ ed of which is immoveable ; and in this there is a valve r, opening inwards, and a tube leading to it, called the conveying tube. There is alfo a hole in this under board, from which a tube leads to the port-vent, Inch is a fquare tube marked 4, riling upward, and inferted into the under fide of the wind-cheit at 2. In the tuoe leading to the port-vent, there is a valve that opens to¬ wards the port-vent, and fuffers the air to go up tne port-vent, but not to return. Now the handle O being pulled down, raifes the upper board 1, and the air en¬ ters through the valve r; and wdien the handle is let go, the weight of the upper board, which carries three or four pounds to every fquare foot, continually defeen- ding, drives the air through the port-vent to the found- board : and as the bellows work alternately, one pair is conftantly defeending, which occafions a continual, blait through the port-vent. In chamber-organs there is but one pair of bellows’, but they are formed of three boards, in the manner of a fmith’s belkuvs, and lo have a conti¬ nual blaft. All the internal llruCture of the organ is concealed from the fight by the front of the inllrument, which (lands upon the part between the numbers 3 and 6 (fig. I.). . . TITTVT In every organ, the number of partitions LL, MiM, &c. there are in the found-board (fig- t-)* that of the valves VV, that of the rollers s s, or of the levers * i/ or 8 9 and their wires, and that of the keys ABC, Sec. mud be always equal. Large organs have com¬ monly four or five fets of keys, befide thofe that be¬ long to the pedals or large pipes, the (lops to wdnch are played by the feet} (aid to be the invention or Bernard, a German, about the . year 1400. Thefe command certain pipes, which, to increafe the narmony, are turned below the diapafon. ide keys of an organ are ufually divided into four oflaves ’, which are, the firll fub-o6lave, fecond fub-o£lave, middle otlave, and firft odlave. Each oftave is divided into 1 2 (lops or frets, of which feven are black and five white} the former mark the natural notes, and the latter the artificial notes, that is, flats and (harps. The number of keys, therefore, when there are four oblaves, mu(l be 48. ^ Some orga- nifts add one or more (lops to the firft and fecond fub- O K G The pedals have two or three o£laves, at the option of the organift j fo that the number of (tops is in¬ determinate. The keys are placed between GG (fig. 1.), but the fcheme could not contain them all. 1 here, are alfo as many handles /, /, Sic. rollers RR, Sic., fliders Jifi &-c’ as there are (lops upon the organ} and it mull be obferved, that between the Aiders/iy', Sic. there are as many fliders on the right hand, and the fame number of handles and rollers, and other rows of pipes placed between LN, PO, which could not be expreiied in the figure. ^ * The lead pipes and partitions are placed toward tne middle of the organ, and the greateft on the. outfide. The (lops of an organ have various denominations, ac¬ cording to the founds they are to produce 5 fome of which are diapafon, principal, fifteenth, twelfth, teaice, cornet, trumpet, French horn, vox humana, flute, baf- foon, cremona, &c. The foreign organs, eipecially thofe of Germany, have many more : particularly that in the abbey church of Weingarten, a town in the Upper Pa¬ latinate, which has 66 (lops, and contains no fewer than 6666 pipes. The organ at Haerlem is faid to have 60 (lops, many of them but little known to the Enghlh workmen, and diftinguilhed by names that exprefs the found which they produce. When this magnificent inftrument is played, the handle O of the bellows is firft put down, which raifes the upper board T, and gives room for the air to en¬ ter by the valve r. TLhen the otner handle O is put down : In the mean time the board T, belonging to the firft handle, defeending, and (hutting the valve r, drives the air through the other valve, up the poit- vent, and into the wind-cheft. Then drawing out any handle, as that of the flute-ftop /> /, which draws out the Aider fg, all the pipes in the. fet LN are ready to play, as foon as the keys C, D, E, &c. are put down . therefore if the key D be put down, it opens the cor- refponding valve m V, through which the air enters into the pipe X, and makes it found, . In the fame manner any other pipe in the fet LN, will found when its key is put down •, but no pipe, in any other fet, will found till the Aider be drawn out by its correfponding. handle. _ „ , Among the modern improvements ox the organ, the mod remarkable are the fwell and the tremblant:. the former, invented by an Englifii artift, confifts. m a number of pipes placed in a remote part of tne mftru- ment, and inclofed in a kind of box, which being gradually opened by the preffure of the foot, increales the found as the wind does the found of a peal 01 bells, or fuppreffes it in like manner by the contrary aftion. The tremblant is a contrivance by means ol a valve in the port-vent or palfage from the wmd- cheft, to check the wind, and admit it only by darts 5 fo that the notes feem to Hammer, and the whole m- ftrument to fob, in a manner very offenfive to the ear.- There is a tremblant in the organ at the German cha¬ pel in the Savoy. See Hawkins’s Hijlory of Mufic, and Hydraulic ORGAN, denotes a mufical machine that plays by water inftead of wind. Of thefe there are fe- veral in Italy, in the grottoes of vineyards. Ctefebes of Alexandria, who lived in the time of Ptolemy Euerge- tes, is faid to have invented organs, that played by com- prefling the air with water, as is dill praclifed, Archi- 0 medes Organ, ° R I t 454 ] OKI Orgafm medes and Vitruvius have left us defcriptions of the hy- ORIBASU3, a celebrated phyfician greatly dleeni- Cribafu?. Oribafia draulic organ; ... ed by the emperor Julian, in whofe reign he flourithed. OrichaU —... In the cabinet of Queen Chriftina is a beautiful and He abridged the works of Galen, and of all the moft clun- large medallion of Valentinian, on the reverie whereof refpeclabie writers on phyfic. This was done at the re- * ' is teen one of thefe hydraulic organs ; with two men, one on the right, the other on the left, feeming to pump the water which plays it, and to lilten to its found. It has only eight pipes, placed on a round pedeftal. The in- feription is flacea spetri, if it be not wrong copied, ■which we fufpeft to be the cafe. ORGASM, o^yxo-ftof, denoting violence or turgefcen- cy ; formed from c^yxu, turgeo, “ I fwell,” an ecftafy or impetuous defire of coition, occafioned by a turgelcency of the feminal veffels, which are no longer able to re- ftrain their contents. The ancients alfo extend orgafm to the other humours, and even excrements, which be¬ ing accumulated, and coming to ferment, demand excre¬ tion. Quincy ufes orgafm for an impetuous or too quick motion of the blood or fpirits; whereby the muf- cles are diftended with an uncommon force. ORGIA, feaits and facrifices in honour of Bacchus, held every third year, and chiefly celebrated by wild diffracted women, called Bacchcc. The chief folem- nities w'ere performed in the night, to conceal, per¬ haps, their fliocking impurities ; and a mountain was generally chofen as the place of celebration. They were inftituted by Orpheus ; and from him are fometimes called Orphicn. Authors are not agreed as to the deri¬ vation of the word j but ifwTe confider the frantic pro¬ ceedings of the Bacchanalians, furor, bids fair for the true etymology. See Bacchanalia. Orgia, according to Serviusfvas a common name for all kinds of facrifices among the Greeks, as ceremonire was amonglt the Romans. ORGUES, in the military art, are thick long pieces of wood, pointed at one end, and fhod with iron, clear one of another ; hanging each by a particular rope or cord, over the gateway of a ftrong place, per¬ pendicularly, to be let fall in cafe of the approach of an enemy. Orgues are preferable to herfes, or portcullices, be- caufe thefe may be either broke by a petard, or they jnay be Hopped in their falling down : but a petard is ufelefs againft an orgue ; for if it break one or two of the pieces, they immediately fall down again and fill up the vacancy j or if they flop one or two of the pieces from falling, it is no hinderance to the reft ; for be¬ ing all feparate, they have no dependence upon one ano¬ ther. Orgues, is alfo ufed for a machine compofed of fe- veral harquebufs or mulket barrels bound together, by means whereof feveral explofions are made at the fame time. It is ufed to defend breaches and other places attacked. ORGY A, o^yvtx, an ancient Grecian meafure Con¬ taining fix feet. QRIBASIA, a genus of plants belonging to the pentandria clafs, and in the natural method ranking under the 47th order, Stellate?. See Botany Index. queft of the emperor. He accompanied Julian into the eaft, but his fldll proved inefle&ual in attempting to cure the fatal wound which his benefactor had received. After Julian’s death he fell into the hands of the bar¬ barians. ORICHALCUM, or Aurichalcum, a metallic, fubltance refembling gold in colour, but very inferior in value. It was wHl known to the old Romans, who often took advantage of its refemblance to gold : for fome facnlegious characters, who could not refift the temptation of taking gold from temples and other pu¬ blic places, chofe to conceal their guilt by replacing it with orichalcum. It was thus that Julius Ctefar acted when he robbed the capitol of 3000 pounds weight of gold 5 in which he was followed by Vitellius, who de- fpoiled the temples of their gifts and ornaments, and replaced them with this inferior metal. It has been a matter of difpute with philofophers and others, what this metal could be, or how it was procured or made j it is probable at leaft that it was greatly analogous to our brafs, if not tvholly the fame with it (See Brass). The value of our brafs is much Jefs than that of gold, and the refemblance of brafs to gold, in colour, is ob¬ vious at firft fight. Both brafs and gold, indeed, are fufceptible of a variety of fhades of yellow 3 and, if very pale brafs be compared with gold, mixed with much copper, fuch as the foreign goldfmiths, efpecial- ly, ufe in their toys, a difparity may be feen 5 but the neamefs of the refemblance is fufliciently afeertained in general, from obferving that fubftances gilded with brafs, or as it is commonly called Dutch leaf are not eafily diftinguiflied from fuch as are gilded with gold leaf. The Romans were not only in pofleflion of a metallic fubftance, called by them orichalcum, and refembling gold in colour, but they knew alfo the manner of making it, and the materials from which they made it were the very fame from which we make brafs. There are, in¬ deed, authors of great repute who think very different-- ly 5 and who confider the art of making brafs as an in¬ vention wdiolly modern. Thus M. Cronftedt does not think it juft to conclude from old coins and other anti¬ quities, that it is evidently proved that the making of brafs was known in the moft ancient times * 5 and the * Mine* authors of the French Encyclopedic affure us, that ourp. 2x8. brafs is a very recent invention (a). It appears, how7- ever, from Pliny’s Nat. Hift. lib. xxxiv. §. 2. and from the concurring teftimony of other writers, that orichal¬ cum wTas not a pure or original metal; but that its bafis was copper, w'hich the Romans changed into orichalcum by means of cadmia, a fpecies of earth which they threw upon the copper, and which it abforbed. It has indeed been contended, that the cadmia of Pliny wras native arfenic ; an opinion which fcarcely merits confutation, but which muft appear extremely groundlefs, when we refledt (a) Art. Orichalque.—“ The veffels here called brazen, after ancient authors, cannot have been of the ma¬ terials our prefent hrafs is compofed of 5 the art of making it is a modern difeovery.” See Laughton's Hi/lory of Ancient Egypt, p. 58. * 4 O Pi I [ 455 ] O R I * Fol. Tran/. vol. i. p. 16, reileifl that it is impoflible to make either brafs or cop¬ per from arfenic, and that Pliny exprefsly calls it aJlone from which brafs was made. The teilimony of Am- brofe bifliop of Milan, in the 4th century, and of Pri- m&fius bilhop of Adrumetum, in Africa, in the 6th, and of Ifidorus bithop of Seville in the 7th, all feem to con¬ firm Pliny’s account. We may therefore fafely con¬ clude that the Romans knew the method of making brafs by mixing cadmia or calamine with copper 5 yet it is probable they were not the inventors of this art, but that they borrowed it from fome other country. It ap¬ pears from a variety of tellimonies that brafs rvas made in Afia, in a manner very limilar to that at Rome; and a variety of places are mentioned in that extenfive coun¬ try where it was commonly made; and it is fuppofed by fome that in India, as well as in other parts of Afia, it was made in the remotefl: ages. With refpeft to orichalcum, it is generally fuppofed that there were two forts of it, one factitious, the other natural. The factitious, wdiether we confider its qualities or compofition, appears to have been the lame with our brafs. As to the natural orichalcum, there is no impofiibility in fuppofing, that copper ore may be fo intimately blended with an ore of zinc, or of fome other metallic fubftance, that the com¬ pound, when fmelted, may yield a mixed metal of a paler hue than copper, and refcmbling the colour of either gold or filver. In Du Halde’s hiftory of China, we meet with the following account of the Chinefe white copper. “ The mofi: extraordinary copper is called de-tong, or white copper: it is white when dug out of the mine, and ftill more white within than with¬ out. It appears by a vaft number of experiments made at Pekin, that its colour is owing to no mixture j on the contrary all mixtures diminifh its beauty j for, wdren it is rightly managed, it looks exaCtly like filver: and were there not a neceflity of mixing a little tutenag, or fome fuch metal writh it, to foften it and prevent its brittlenefs, it wmuld be fo much the more extraordinary, as this fort of copper is perhaps to be met with no¬ where but in China, and that only in the province of ICun-n-an* d'1 Notwithftanding what is here faid, of the colour of this copper being owing to no mixture, it is certain that the Chinefe white copper, as brought to us, is a mixed metal} fo that the ore from which it is extradled mufl confift of various metallic fubltan- ces, and from fome fuch ore it is poflible that the natu¬ ral orichalcum, if ever it exifted, may have been made. But, notwithftanding that the exiftence of natural ori¬ chalcum cannot be fhown to be impoftible, yet there is fome reafon to doubt wdiether it ever had a real exift¬ ence or not. We know of no country in which it is found at prefent •, nor was it anywhere found in the age of Pliny • nor does he feem to have known the country where it ever had been found. He admits, indeed, its having been formerly dug out of the earth; but it is remarkable, that in the very palfage where he is mentioning by name the countries mold celebrated for the production of‘different kinds of copper, he only fays in general concerning orichalcum, that it had been found in other countries, without fpecifying any particular country. Plato acknowledges, that ori¬ chalcum was a thing only talked of even in his time ; it wras nowhere then to be met with, though in the Orig;en. ifland of Atlantis it had been formerly extraCled from Orklia!- its mine. The Greeks were in pofieffion of a metallic cum fubftance, called orichalcum, before the foundation of Rome ; for it is mentioned by Homer and by Hefiod ; > and by both of them in fuch a manner as fhows that it was then held in great efteem. Other ancient wri¬ ters have expreffed themfelves in fimilar terms of com¬ mendation •, and it is principally from the circumftance of the high reputed value of onchalcum that authors are induced to fuppofe the ancient orichalcum to have been a natural fubftance, and very different from the factitious one in ufe at Rome, and probably in Afia, and which it has been drown was nothing different from our brafs. But this conclufion cannot be validly drawm from their encomiums upon it 5 for at whatever time the method of making it was firft difcovered, both its novelty and fcarcenefs, joined to its utility, would enhance its value, at leaft there can be no abfurdity in fuppofing, that when firft introduced it was greatly prized, even though it be- granted that it poffeffed no other properties than fuch as appertain to brafs. RefpeCting the etymolgy of the wTord there is great diverfity of opinions. Thofe who write it aurichalcum think it is compofed of the Latin word aurum, “ gold.” and the Greek “ brafs or copper.” The mod: ge- reral opinion is, however, that it is compofed of ’egaj “ a mountain” and alluding perhaps to its being found in mountains or mountainous countries. The above account is chiefly extracted from a paper in the te- cond volume of Memoirs of the Literary and Philofo- phical Society of Manchefter, written by the prefent bi¬ thop of Landaff, Dr Watfon, and communicated by Dr Percival. To this paper then we refer our readers who defire a more copious account of it. To the above tw’o etymological meanings of the word wre (hall fubjoin the following, mentioned by the learned bithop, and w'hich, in our opinion, is equally well founded, and cer¬ tainly as ingenious, as the other two. The Hebrew word Or, Aur, fignifies light, fire, flame 3, the Latin terms uro “ to burn,” and aurum “ gold,” are derived from it, inafmuch as gold refembles the co¬ lour of flame : and hence it is not improbable, that ori¬ chalcum may be compofed of an Hebrew and Greek term, and that it is rightly rtnd.trtd.,Jlame-coloured cop¬ per. In confirmation of this it may be obferved, that the Latin epithet lucidum, and the Greek one (pxuvov, are both applied to orichalcum by the ancients. See alfo Beckmann, Hift. of Invent, iii. 71. ORIFICE, the mouth or aperture of a tube, pipe, or other cavity. ORIGANUM, Origany, or Marjoram, a genus of plants belonging to the didynamfa clafs, and in the natural method ranking under the 42d order, Verticil lata;. See Botany Index. ORIENT, a town and harbour of France, in the department of Morbihan, in the bottom of the bay of St Louis. Since the year, 1720, a handfome towm has been built here, where the French Eaft India company have large magazines. The Englilh attempted to be¬ come mafters of it in 1746, but mifearried. W. Long, 3. 22. N. Lat. 47. 45. ORIENTAL Philosophy. See Philosophy. ORIGEN, one of the moft celebrated ecclefiaftical ■writers, greateft geniufes, and moft learned men of the O R I the primitive church, during the third century, was born at Alexandria in the year 185: and was fur- named Adamantus, either from his indefatigable applica¬ tion to ftudy, or from the firmnefs he difcovered amidft the torments he fullered for the faith. Leonidas, his father, trained him at home wdth great care, and made him apply to the ftudy of the Holy Scriptures from his infancy, in wdiich he made furprifing progrefs. The fon’s inclination and turn fuited exactly with the father's defign j for he purfued his ftudies ivith a moft extraordinary zeal and ardour: and, being endued with a quick apprehenfion and a ftrong imagination, did not content himfelf with that fenfe which at foil prefented itfelf, but farther endeavoured to dive into myfterious and allegorical explications of the facred books. He would fometimes even puzzle his father, by too much foliciting him for recondite meanings j which obliged the good man to reprehend him a little, and withal to advife him not to attempt to penetrate too far in the ftudy of the Holy Scriptures, but to content himfelf with their moft clear, obvious, and natural fenfe. Hence it appears, how early he was feized with that furor allcgoricus, as a learned modern calls it, that rage of expounding the Scriptures alle¬ gorically, which grew afterwards to be even a diftem- per, and carried him to exceffes which can never be excufed (a). He had afterwards in philofophy Am- monius the celebrated Chriftian philofopher, and St Clement of Alexandria for his mafter in divinity. At 18 years of age he fucceeded that great man in the office of catechift*, an important employment, which confifted in teaching divinity, and expounding the Scriptures. Leonidas his father had fuffered martyrdom the year before, during the perlecution of Severus in 202; and Origen had ihown fuch eagernefs to follow his father to martyrdom, that his mother was obliged to hide his clothes to prevent his going abroad. Origen had a great concourfe of auditors who attended his fchool, fome of whom were of the faithful, and the others pa¬ gans. He confirmed and ftrengthened the firft in their faith, and converted moft of the others; and there w ere fuch a number of martyrs amongft his difciples, that it might be faid, that he kept rather a fchool of martyr¬ dom than of divinity. He taught the doclrines of Chri- ftianity to the girls and women as rvell as to the men •, and taking in a too literal fenfe what Chrift fays of be¬ coming voluntary eunuchs, caftrated himfelf, to prevent his deferving or fuffering fcandal. He took a voyage to Rome in 211, in the beginning of Caracalla’s reign, under the pontificate of Zepherinus. At his return he publiffied many works, by which he acquired an extra¬ ordinary reputation, that drew to him a great number of O R I auditors. But Demetrius, bifhop of Alexandria, con- Ciigeti. ceiving a jealoufy of him, endeavoured by various pre- " v tences to injure him. At length Origcti went 10 An¬ tioch, wffiether the emprefs Mammaea had fent for him to hear him difccurfe on the Chriftian religion. He did not however flay long there, but returned to Alexandria, where he continued to teach till the year 228, when he left that city, and travelled into Achaia. In that journey he went into Paleftine, and wras ordained by the biffiops of that province at 42 years of age. His being ordained by foreign biftiops, without the per- miflion of Demetrius, renewed that prelate’s refent- ment againft him 5 on which Origen haftily returned to Alexandria, to endeavour to mollify him : but De¬ metrius drove him from thence in 231, and caufed him to be excommunicated, and even depofed in a council held in Egypt. Origen then retired to Ceefa- rea in Paleftine, wffiere he raifed a celebrated fchool, and had St Gregory Thaumaturgus, and a great number of other perfons vTho w’ere illuftrious for their virtue and learning, for his difciples. He afterwards travelled to Athens j and then, at the defire of Firmi- ' lianus, ftaid fome time at Caefarea in Cappadocia j wffience he was invited into Arabia, to convince and bring back to the truth Beryllus bifhop of Boftra 5 who maintained that the Word had no exiftence before his incarnation. Origen had the happinefs to make him fenfible of his miftake ; and fome years after wTas fent for into Arabia by an affembly of biffiops, to difpute againft the Arabians, wffio maintained that the fouls of the dead remained in a ftate of infenfibility till the general refurredfion. At length the feventh perfecu- tion of the Chriftians began in the reign of Decius, and none were ufed with greater feverity than Origen. He fupported with incredible conftancy the dreadful torments wffiich the perfecutors of the Chriftians in¬ vented againft them} torments that w7ere the more infupportable, as they wrere made to continue a long time, and as they took the greateft care to prevent his expiring in the midft of his tortures : but in the midft of the moft excruciating torments, he difcovered an heroic courage, and fuffered nothing to efcape him that wTas unworthy a difciple of Jefus Chrift. He died at Tyre in 2 54, aged 69. He was the author of a great number of excellent works. The principal of thofe which have been handed down to us are, 1. A Treatife againft Celfus, of which Spencer has given a good edition in Greek and Latin, wdth notes: this learned treatife has been tranflated into French by Elias Bouhereau, a proteftant minifter, born at Rochelle. 2. A great number of Homilies, with Commentaries on the Holy Scriptures. ‘ '3. Phi/ocalia, and feveral other [ 456 1 (a) He is the firft Chriftian (whofe notions on this fubjeft have come down to us) who believed in the re- ftitution of all things. This is his fixth diftingurffiing tenet -, to which is added this Angular notion, that as Chrift had been crucified in this world to fave mankind, he is to be crucified in the next to fave the devils. The other obnoxious tenets of Origen are thefe five: viz. 1. That in the Trinity the Father is greater than the Son, and the Son than the Holy Ghoft. 2. The pre-exiftence of fouls, wffiich Origen confidered as fent into mortal bodies for the puniihment of fins committed in a former ftate of being. 3. That the foul of Chrift was united to the world before the incarnation. 4. That the fun, moon, and ftars, &c. were animated and en¬ dowed with rational fouls. g of Scotland, transferred all his right to them to his fon- in-law and his fucceffors; to make which more binding the Pope’s cpnfirmation was obtained. We are told by fome, that Magnus fold them to Alexander for the I ] O R K fum of 4000 nferks fterling, and a yearly acknowledge¬ ment of 100 merks. They are about 30 in number; but many of them are uninhabited, the greater part being imall, and pro1- ducing only pafturage for cattle. The principal iflands are denominated by the names of Mainland, South Ronaldjha, Swinna, Fiona, Copinjha, Strupenjha, Stron- fa, Sanda, fa'c. the terminations in a, or ha, being gene¬ rally given in the Teutonic to fuch places as are fur- rounded by water. The currents and tides flowing be¬ tween the. iflands are extremely rapid and dangerous. Near an ifland called Swinna are twro great whirlpools, called the wells of Swinna, which are count ed dangerous by mariners, efpecially in a calm. When failors find themfelves fucked into the vortex, it is faid they throw- out a barrel, or fome bulky fubflance, which fmooths the water till it is fucked down and thrown up at a con - fiderable diftance, during wddch time the {hip paffes over in fafety. But when there is a breeze of wind, thefe whirlpools may be croffed without any danger. Ihe largeft of thefe iflands is called Pomona, in length 33, and in breadth 9 miles, containing 9 parifh-churches, acid 4 excellent harbours. The air of thefe iflands is moift, on account of the neighbourhood of the fea ; and froft and fnow do not continue long. In fome places the foil is bare and, mountainous, and in others fandy and barren *, howr- ever, many of the iflands produce large crops of barley and oats, but no wheat or other grain excepting what is inclofed in gardens. Thefe, when duly cultivated, produce all kinds of kitchen herbs and roots, bring¬ ing even fruit-trees to maturity} but out of them, in the open country, there is fcarce a tree or fnrub to be feen, except juniper, wfild myrtle, heath, and the cy- ur-hodon : yet this deficiency cannot be imputed to the poverty of the foil, or the nature of the climate : for the trunks of large oaks are frequently dug up in the marfhes. This is likewife the cafe in the mofl: barren parts of the Highlands of Scotland, where not a fhrub is to be feen above the furface of the earths nay, the inhabitants frequently find, deep in the earth, the roots of large trees, evidently exhibiting marks of the axe by wdiich they w-ere felled } fo that thefe north¬ ern parts muft have undergone fome ftrange revolu¬ tions. The Orkneys produce great variety of herbs and berries, grafs and corn, which laft: is exported as far as Edinburgh. In fome of the iflands, the natives have difcovered mines of tin, lead, and filver, though none of them are wrought to any advantage ; in others, we find abundance of marl, gray and red flate, quar¬ ries of freeftone, and even of marble and alabafter. When the wind rages to any violence, the fea throws in plenty of timber, torn from other countries } and, not unfrequently, the people find large pieces of am- bergreafe. The frefli water in theie iflands is very pure and limpid •, and, though there are no large ri¬ vers in the Orkneys, the ground is wTell watered with lakes and pleafant rivulets, that not only ferve to turn their mills, but alio abound w7ith trout of the mok delicate flavour. Befides the abundance of little horfes, black cattle, flieep, fwine, and rabbits, the inhabitants ot the Ork¬ neys rear all forts of domeftic animals and tame poul try. Their heaths and commons yield plenty of red deeFi O R K [ 462 ] O R K deer, and all forts of game; partridges, growfe, heath-cocks, plover, duck, teal, and widgeon : the Jca-coafts teem with feals and otters 5 and are vifited by whales, cod, ling, tufk, herrings, and all manner ot fiHr : on the fhore they find Ipermaceti, os fepiae, and a great variety of Ihells and corallines, with a mul¬ titude of oyfters, remarkably large mufcles, crabs, and cockles. The rocks are covered with fea-fowl, wild geefe, folan geefe, barnacles, eagles, hawks, and kites. With refpeft to the barnacles, or, as the natives rail them, the deck geefe, they are (aid to be found in fiiells flicking by the bills to trees, in feveral iflands. Martin affirms he has feen them in this fituation, but could not perceive them alive ; and indeed the whole account of their generation and produdlion, exhibited by the northern naturalift, is abfurd and unphilofophi- ca'l. The Orkney eagles are fo ftrong, that according to the reports of the country, they have been known to carry away young children in their talons. Certain it is, they make fuch havock among the lambs, that he who kills an eagle is entitled by law to a hen from every iroufe in the parifh where it was killed. The king’s falconer vifits thefe ifiands every year, in order to fetch away the young hawks and Talcons from their nefls among the precipices: he enjoys a yearly falary of 20I. and may claim a hen or a dog front every houfe in the country, except thofe that are exprefsly exempted from this impofition. The gentry of the Orkneys are civilized, polite, and hofpitable 5 and live like thofe of Scotland, from whom they are chiefly defcended. They live com¬ fortably, are remarkably courteous to ftraiigers, and drink a great quantity of wine, with which their cel¬ lars are generally -well ftored. Indeed the inhabitants of the Orkneys may be now juftly deemed a Scotch colony. They fpeak the language, profefs the religion, follow the fafliions, and are lubjecl to the laws, of that people. They are frugal, fagacious, circumfpeft, reli¬ gious, and hofpitable. Their mariners are remarkably bold, aclive, dexterous, and hardy. Many furprifing inftances of longevity occur here, as well as in Shetland, of perfons living to the age of 140. The Orkney wo¬ men are generally handfome, and well fliaped, and bring forth children at a very advanced age. In the Orkneys, fome particular lands are held by a tenure called TJdal Right, from Ulcius, or Olaus, king of Norway, who farmed the lands, on condition of receiving one-third of the produce *, and this right devolved in fucceflicn, xvith- out any charter granted by the fovereign. The inhabi¬ tants of Orkney, inftead of meafuring their corn, weigh it in pifmores or pundlers. Their lead: denomination is a mark, confiding of 18 ounces, and 24 marks make a lifpound, wffiich is a Daniffi quantity. The poorer fort of people in the Orkneys appear very meanly ha¬ bited, with a piece of feal-fkin, inftead of ftioes; and living chiefly on fait fifh, are fubjeft to the fcurvy. They are much addifled to luperftitious rites; in parti¬ cular, interpreting dreams and omens, and believing in the force of idle charms. The iflands of Orkney, we have already obferved, produce very bold, able, and hardy mariners. The common people, in general, are inured to fatigue, and remarkably adventurous, both in fifhing during rough wTeather, and in climbing the rocks for the fiefti, eggs, and down of fea-fowd. Formerly, while they wrere expofed to the invafions of the Nor- 2 wegians, or weftern iflanders, every village was obliged Orkney, to equip a large boat well manned ; and all the fenci-' v We men appeared in arms, when the alarm was given by the beacons lighted on the tops of the rocks and highert mountains. Thefe beacons, known by the name of ward-hills, are ftill to be feen in every ifland. Their corn land they inclofe with mud or ftone walls, to pre* ferve it from the ravages of their flieep, fwine, and cat¬ tle, which winder about at random, without being at¬ tended by herdfmen : their ordinary ihanure, efpecial- ly near the fea-coaft, is fea-weed, which they care¬ fully gather and divide into equal portions. Their ftteep are marked on the ears and nofe \ but fo wild, that when they have occafion to fhear them in the month of May, they are obliged to hunt every indi¬ vidual, with dogs trained for that purpofe. Their manner of catching fea-fowl is curious and particular. Under the rock where thefe fowls build they row their boat, provided wdth a large net, to the upper corners of which are faftened two ropes, lowered dow n from the top of the mountain by men placed in that ftation. Thefe hoifting up the net, until it be fpread oppofite to the cliffs in w'hic.h the fowls are fitting, the boatmen beknv make a noife with a rattle, by which the fowls being frightened, fly forwards into the bo- fom of the net, in which they are immediately en- clofed and lowered down into the boat \ others prac- tife the method ufed in Iceland and Nonvay, and are lowered down by a Angle rope from the fummit of the mountain } this is the conftant way of robbing the hawk’s neft. See BlRD-Catching. In thefe iilands fome ftrange effefts are produced by thunder and light¬ ning. In the year 1680, the lightning entered a cowr- houfe, in which 12 cows flood in a row, and killed every fecond beaft as ffie flood, and left the reft un¬ touched. The diftempers that prevail moftly in the Orkneys are agues, confumptions, fcurvy, and itch. The agues, which abound in the fpring, the natives cure with a diet drink of bitters and antifcorbutics in- fiifed in ale : for phthifical complaints they ufe the plant arby, and the caryophyllus marinus boiled with fweet milk. The ifles of Orkney and Shetland compofe one ftewr- artry, and fend one member to the imperial parliament. The right of fuperiority to the Orkneys was difmember- ed from the crown by the dnion parliament, and grant¬ ed for a certain yearly confideration to the earl of Morton, by Queen Anne, who appointed him heredi¬ tary ftewnrd and jufticiary. This nobleman poffeffes the powTer of creating certain judges, called bailiff's. There is one of thefe eftablilbch in every ifland and pa- rifir, wdth power to fuperintend the manners of the in¬ habitants, to hold courts, and determine civil caufes, ac¬ cording to the law’s of Scotland, to the value of ten pounds Scots money, amounting to 16s. 8d.: but all contefts of higher import are referred to the decifion of the ftervard or his deputy, who refides at Kirkwall, which is the feat of juftice. Subfervient to the bailiffs are fix or feven of the moft reputable and intelligent inhabitants, who overfee the conduct of their fellows, adffng as conftables, a»d make report of all enormities to the bailiff; who caufes the delinquent to be appre¬ hended and puniffied, if the crime be within the extent of his judicial pow’er; otherwife he tranfmits him to Kirkwall, where he is tried by the fteward. The Pro- teftant O R K [ 463 1 O R K Orkney, teftant religion prevails in the itles of Orkney, accord- T——' ing to the rites and dilcipline of the kirk ; thefe, and the illes of Shetland, conflituting one preftytery, which aflembles at Kirkwall. The country is divided into 18 parilhes, containing 31 churches, and above 100 chapels. The trade of the Orkneys is not very confiderable, though it might be extended to great advantage. They fupply with freih provinons, for ready money, the ftiips and veflels that touch upon the coal! in the courfe of northern voyages, or in their pafiage from the Eaft In¬ dies, when they go north about Ireland and Scotland, in time of wrar, to avoid the privateers of the enemy. They are alfo vilited by thofe engaged in the herring- hlhery, though there is not fuch a refort on this account to thefe iflands as to the ifles of Shetland. Neverthe- lefs a good number of boats from the weftern parts of Scotland, as well as from Londonderry, Belfaft, and other parts of Ireland, fifh for herring as far north as the Leuze, and fupply the Orkneys with tobacco, wine, brandy, and other fpirituous liquors, cloths, and divers manufactures. Thefe they exchange for fifh, and oil extratled from porpoifes, feals, and other fea-animals. The people of Orkney export annually great numbers of black cattle, ’twine, and flieep ; together with large quantities of corn, butter, tallow, fait, and fluffs made in the country, over and above the Ikins of feals, ot¬ ters, lambs, and rabbits, • down, feathers, writing-quills, hams, and wool yet all thefe articlesywould, in point of profit, fall infinitely fhort of their herring-fifhery, were it profecuted with induftry, economy, and vi¬ gour. The moft valuable of their manufactures is kelp, and indeed the ftaple commodity was firft introduced in J722, by a Mr James Fea, of Whitehall, in Stronfay, fince- which period it has been gradually on the increafe. From 1763 to 1778, there were manufactured, on an « average, 1800 tons annually at four guineas per ton-, from 1778,10 1792, the annual average produce was 3000 at 61. per ton j from I792 *-° x794» above 4000 tons. Thus, from 1722 to 1794, a period of 72 years, the produce of the kelp was 291,976!. fterling, or more than the value of all the Orkney iflands, even at the rate of 36 years purchafe j the annual rent, exclufive of the kelp" and fiiheries, not exceeding 8000I. fterling. As there are no merchants in the Orkneys at prefent who export fifh on their own account, what herrings are taken they fell to the Dutch or Scotch dealers in and about Invernefs. They generally fifh for herring on the weft fide of the Orkneys; and are therefore more remote from markets than thofe who are employed in the fame manner on the coaft of Shetland. In the Ork¬ ney ifiands they fee to read at midnight in June and Ju¬ ly -, and during four of the fummer months they have frequent communications, both for bufinefs and curio- fity, with each other, and with the continent : the reft of the year, however, they are almoft inacceffible, through fogs, darknefs, and florins. It is a certain iaCl,. that a Scotch fifherman was imprifoned in May for pu- bliflunu the account of'the prince and princefs. of O- range being railed to the throne of England the prece¬ ding November; and he would probably have been hanged, had not the news been confirmed by the arrival of a {hip. We may reckon among the curiofities of the Ork neys, the Phqjeoh, commonly known by the name of Or.mev- Molucca beans, and fometimes they are called Orkney beans. They are a fort of fruit found on the fhcie of the Orkney iflands, being thrown on them by ftorms of westerly wind. They are of feveral dhtinCl Ipecies, and are none of them the produce of thofe iilands, nor of any places thereabout, but are probably of American origin, many of them being plainly natives of Jamaica, and other illands of the Indies. They are found principally on thofe coafts which are moft expofed to the waves of the great ocean, and are - on thefe fo plentiful, that they might be gathered in large quantities, if of any value 5 but the only ufe they are put to is the making of inuft-boxes out of them. Sir Robert Sibbald, and Mr Wallace, in their accounts of Scotland, have both named them Molucca BEAN'S. Many ftrange fifties and curious {hells are alfo frequent¬ ly caft up by the ocean ; of thele laft a vaft variety are preferved for adorning the cabinets of modern natural- ifts. Sometimes exotic fowls are driven upon the Ork¬ neys by tempeifuous weather : fiih, as large as whitings,, have been thrown afliore to a confiderable diftance with¬ in the land. At Cantick-head, in the ifland Waes, and fome other places, huge ftones are often heaved up by the violence of the lea and wind, aud caft over high , rocks upon the land. A fingle Laplandar has been feen more than once upon this coaft, in his (lender canoe, co¬ vered with {kins, being driven hither by adverfe winds and ftorms. The Orkneys are not altogether deftitute of ancient monuments and curiofities of art. In Jioy ■we find an entire ftone, 36 feet long, 18 in breadth, and 9 in thicknefs, lying between two hills, and known by the name of dwarjie Jlone. It is hollowed within by the tools of a mafon, the marks of which are ftill appa¬ rent. The entrance is a fquare hole about two feet high, with a ftone, by way of door, {landing before it. Within we find a bed with a pillow cut out of the ftone: at the other end is a couch of the {ame kind; and in the middle a hearth, above which there is a hole or vent for the exit of the fmoke. This curiofity is found in the midft of a defolate heath, and is fuppofed to have been the refidence of a hermit : in the very neighbour¬ hood of this ftone there is a very high and fteep moun¬ tain, called the ward-hill of Hoy, near the fummit of wdiich, in the months of May, June, and July, fome- thing at noon-day is feen to fliine and fparkle with re¬ markable luftre, fuppofed by the common people to be an inchanted carbuncle ; many perfons have clambered up the hill in queft of it, but found nothing. Perhaps this fplendour is produced by the refiedlion of the fun on a fmall ftream of water Aiding over the face of a fmopth rock. At Stennis, in Mainland, there is a oauleway of ftones over a loch or lake, at the fouth end of which we obferve a circle of ftones rifing about 20 feet above ground, each being fix feet in breadth, and from one or two feet in thicknefs : between this circle and the caufeway two ftones of the fame dimenfions {land by themfelves, and one of them is perforated in the middle. At the diftance of half a mile from the- other end of the caufeway appears a larger circle of the fame kind of ftones, the diameter of which may amount to no paces -, fome of thefe ftones are fallen j and to the eaft and weft of the larger circle are two artificial green mounts. Both rounds are furrounded with a ditch ; and one cannot view them without admiration, Gonfidering / O R K [ 464 ] O R K Orkney, confidering the art that muft have been ufed to bring r, — unwieldy mafles together in this order. They were probably temples and places of facrifice ufed in times of pagan fuperftition *, and feem to bear a great affinity with the celebrated monument called Stonehenge, on Salifbury Plain in England. In one of the mounts, at the north end of the caufeway, the natives found nine JibuLe, or clafps of lilver, formed into a circle, and re- fembling a horfe ffioe. In many different places of the Orkneys we find xude obelifks or {ingle ftones of a great height, fet up either as memorials of battles, treaties, or the deceafe of remarkable perfonages. In Roufay, be¬ tween two high mountains, there is a place which the natives diftinguifh by the appellation of the camp of Ju¬ piter Fring: but the meaning of this name, handed down by tradition, is not known. At the weft end of the Mainland, near Skeal, we find a furpriling caufe- way, above a quarter of a mile in length, on the fummit of high hills, compofed of reddifh ftones of different magnitudes imprefled with various figures both on the upper and under furface. Some gentlemen in the neigh¬ bourhood have carried off the moft beautiful of thefe ftones, to be fet in their chimneys by way of ornament, like the painted tiles of Holland. This country pro¬ duces many fepulchres of different nations. In the plains or links of Skeal, the fand being blown away from the furface of the ground, feveral Iquare catacombs appear built of ftones well cemented together, containing fome parcels of black earth, and each fecured by a large ftone at the mouth. Sepulchres of the fame kind are found at Roufum in Stronfa ; which is likewife remarkable for a different kind of monument, confifting of one entire ftone cylinder hollowed, with a bottom like that of a barrel, and a round ftone to fill up the entrance •, above, the ftone was fharpened into an edge ; within were found fome burned bones and red clay ; and over it was placed a large flat ftone for the prefervation of the whole. Thefe, in all probability, were Roman catacombs. In Weftra divers Danifh graves have been difcovered: in one of thefe appeared the fkeleton of a man, with a fword on one fide and a Danifh axe on the other. Some have been found buried with dogs, combs, knives, and other utenfils. In many places of the country we find round hillocks or barrows, here known by the name of brogh, fignifying, in the Teutonic language, burying place, fuppofed to have been the cemeteries of the an¬ cient Saxons. In different parts of thefe iflands we fee the remains of great buildings, believed to have been fortreffes erefted by the Danes or Norwegians when they poffeffed the country. One of thefe in the ifle of Wyre, called the caftle of Coppi-row, fignifying -a town of fecurity, is furrounded by a foffe, jand the firft floor ftill remains above ground, a perfect fquare of ftone wall, very thick, ftrongly built, and cemented with lime, the area within not exceeding ten feet in length. Of this Coppi-row the common people relate many idle fa¬ bles. In the chapel of Clet, in the ifle of Sanda, there is a grave 19 feet long, in which was found part of a man’s back bone, larger than that of a horfe. Human bones, of nearly the fame fize, have been dug up in Weftra j and indeed this country is remarkable for pro¬ ducing men of a gigantic ftature. Within the ancient fabric of Lady Kirk in South Ranalfhaw, there is a Hone four feet long and two feet broad, on which the prints of two feet are engraven, fuppofed to be the place 4 where, in times of popery, penitents flood to do public Orkney, penance. The cathedral of Kirkwall, the capital of the Orkneys, is a fine Gothic building, dedicated to St Magnus, but now converted into a parifh church. Its roof is fupported by 14 pillars on each fide ; and its fteeple, in which is a good ring of bells, by four- large pillars. The three gates of the church are chequered with red and white polifhed ftones, emboffed and ele¬ gantly flowered. Campbell, in his Political Survey, fuggefts two im¬ provements in the Orkneys : 1. The erefting an uni- verfity 5 of which he recapitulates the probable advan¬ tages arifing from their centrical fituation : And, 2. Allowing the Eaft India Company to eredl a fpacioufi magazine in one of thefe iflands •, where alfo a colleft* or, and a fufficient number of king’s officers, fhould re- fide, to receive the duties of fuch Eaft India commodi¬ ties as might be taken off by Britilh fubjefts. Thefe he propofes for the Orkneys in particular, and in addi¬ tion to improvements propofed for the whole iflands in general. The following table exhibits a view of the population of the parifhes of Orkney and Shetland, at two period^. Population in I755- 10 Parifhes. Orkney. Crofs, Burnefs, &c. i 250 Dearnefs and St Andrew’s 1650 Evie and Rendall 1'19% Firth and Stennefs 1108 Harray and Birfay 22co Holm 118 5 Hoy and Graemfay 520 Kirkwall 1089 Lady kirk 750 Orphir _ 855 Roufay and Eglifhay 978 Shapinfhay 642 South Ronaldfhay, &c. Slromnefs and Sandwick 2677 Stronfay and Eday I493 Walls and Flota 1000 Weftray and PapaWeftray 1290 Total, Orkney, Population in jyyo—1798.. 1389 1335 *564 1186 2013 702 410 2550 803 826 1072 730 I954 3®12 *887 991 1629 Shetland. Breffay and Burray Delting 20 Dunroffnefs Fitlar and North Yell Lerwick Nefting Northmaving 25 Sandfting South and Mid Yell Tingwall Unft 29 Walls and Sandnefs Total, Shetland, Orkney, Total, 23>3Sl 1098 1221 2295 1098 II93 1169 1009 911 986 1412 1368 _iii0 15,210 23»381 38?59I 23?°53 122: I5°4 3327 j346 1259 *53 5 1786 1285 1422 1786 1988 1723 20,186 23>°53 43>239 37.591 Increafe, 4648 But O R L [ 465 j O R L Orlc But in 1 Sox, according to the returns made to Par- 11 liament, the population of Orkney was 24,445, and that Orieans- c£ £hetPailc} was 22,379. For a fuller account of Ork¬ ney, fee Barry’s Hiitory of the Orkney lilands, 4to. tSoj. ORLE, Orlet, or Orlo, in Architecture, a fillet un¬ der the ovolo, or quarter round of a capital. When it is at the top or bottom of a fhaft, it is called cinBure. Palladio ufes the word orlo for the plenith of the bafis of the columns. Orle, in Heraldry. See Heraldry. ORLEANOIS, a province of France, now forming the department of Loiret, and including the feveral di- ftricts of Orleanois-Proper, Beauce-Proper or Char- train, Eunois, Vendomois, Blaifois, the greateft part of Gatinois, and Perche-Gouet. The principal rivers of it are the Loire, the Loiret, the Cher, the Laconic, the Aigle, the Hyere, tire Yonne, and the Eyre. There are alfo fome remarkable canals, particularly thofe of Briare and Orleans. The river Loire, and the canals drawn from thence, greatly facilitate and promote the inland trade of the kingdom, and particularly of this department. Orleanois, in Latin Aurelianenfis Ager, is bounded on the fouth by Sologne, on the north by Upper-Beauce, on the eaft by Gatinois, and on the weft by Eunois and Vendemois. The Loire divides it into Upper and Lower j the former lying to the north, and the latter to the fouth of that river. It yields plenty of grain, wine, ■wood, and fruit, and abounds in cattle, game, and fifh. ORLEANS, the capital of the government of Or¬ leanois, now the department of Loiret. It was ancient¬ ly called Genahum, or Cenahum ; and afterwards deno¬ minated Aurelia, Aurelue, and Aurelianum, by the em¬ peror Aurelian, who confiderably enlarged it. In Ju¬ lius Caefar’s time it was the capital of the Carnutes. It Hands about 20 leagues fouth of Paris, on the northern bank of the Loire •, acrofs which Mr Wraxall fays there is an elegant bridge of nine arches, the entrance by which is exceedingly noble and ftriking, the ftreet which leads from it being compofed of moft elegant modern buildings. In general, however, excepting this ftreet, it is very meanly built 5 the ftreets are narrow, and the inhabitants in general poor. It is furrounded with walls, and fortified with 40 towers. The ftreets almoft all terminate at the quay for the convenience of trade. It is a place of confiderable magnitude 5 and before the revolution had feveral inferior courts of juftice, and an univerfity of no great repute. It was alfo a bilhop’s fee •, and the cathedral is a moft fuperb Gothic ftrufture, and had the fineft fteeple in France till it was damaged in the time of the civil wars. There were 22 parifties in it, and a great number of churches, fome of which were collegiate, and religious houfes. There is alfo a public walk, planted with feveral rows of trees j and there ufed to be fome fugar bakers; a manufa&ure of ftockings and Iheep fkins *, a feminary in which divinity was taught •, a great trade in bran¬ dy, wine, fpices, and feveral manufactures, which, with many other commodities, ufed to be conveyed to Paris by means of the Loire, and the canal which takes its name from the city. The canal begins about two miles above the city ; is near 18 leagues in length ; and terminates on the Loing, which falls into the Seine. Vol. XV. Part II. The environs of Orleans, more efpecially in the pro- Orleans, vince of Sologne, to the louth of the Loire, are very agreeable. It is in general a level country, covered with corn and vines. To the north of the city is a foreft, the largeft in the whole kingdom. Before the revolution it belonged to the Duke of Orleans • to whom the timber lelled In it, one year with another, brought about 100,000 livres. Ever fince the year 1344 this city has been a dukedom and peerage, and ufually an appendage of fome prince of the blood. The late duke, who took the name of Egalite, and who was afterwards guillotined, feems to have been one of the moft deteftable monfters which ever difgraced hu¬ manity. Louis XIV. gave the dukedom to his owm brother Philip, who began and finiftied the canal $ which, by the duties paid by veffels going up and down, brought in, one year with another, 150,000 livres. The biftiop wTas fuffragan to the archbifhop of Paris, and had a revenue of 24,000 livres, cut of which his tax to Rome was 2000 florins. A new7 bilhop, it is laid, on the firft day of his entering, had the privilege of releafing all the prifoners in it, except thofe committed lor trealon. In the ftreet leading from the bridge frauds the celebrated monument where Charles VII. and Joan of Arc the Maid of Orleans, are reprefented on their knees before the body of our Saviour, who lies extended on the lap of the Virgin. It was erefted by order of that mo¬ narch in 1458, to perpetuate his viftories over the Englifti, and their expulfion from his dominions. AH the figures are in iron. The king appears bareheaded, and by him lies his helmet furmounted with a crown. Oppofite to him is the Maid herfelf, in the fame atti¬ tude of grateful devotion to Heaven. It is a moft precious and invaluable hiftorical monument. “ In the Hotel de Ville (fays Wraxall) is a portrait of the fame immortal wmman, which I ftudied long and attentively. Though it was not done till 1581, which was near 130 years after her deceafe, it is yet the oldeft and beft picture of her now7 exifting. The painter feems undoubtedly to have drawn a flattering refemblance of her, and to have given his heroine imaginary charms. Tier face, though long, is of ex¬ ceeding beauty, heightened by an expreflion of intel¬ ligence and grandeur rarely united. Her hair falls loofely dowm her back, and (lie wears on her head a fort of bonnet enriched with pearls, and Ihaded with white plumes, tied under her chin with a firing. About her neck is a little collar, and lowTer down, upon her bo- fom, a necklace compofed of final 1 links. Her drefs, which is that of a woman, I find it difficult exaftly to deferibe. It fits clofe to the body, and is cut or flathed at the arms and elbows. Round her waift i$ an embroi¬ dered girdle, and in her right hand (lie holds the fword wuth which the expelled the enemies of her fovereign and her country. I am not furprifed at the animated and enthufiaftic attachment which the French Hill che- rifh for her memory. The critical and defperate emer¬ gency in which {he appeared 5 her fex, youth, and even the ohfeurity of her birth 5 the unparalleled fuccefs which crowned her enterprife ; the cruel and deteftable fentence by which ftie w7as put to death ; the air of the marvellous fpread over the whole narration, increafed and {Lengthened by that veneration which time affixes! to every great event—all thefe united caufes confpired 3 N to - Orleans Ormikirk, 0 R M [ 466 -I to place lier above mortality. Rcmc and Athens would Merfey, Dee undoubtedly have ranked her among their tutelary del* _ ties, and have erefted temples to her honour j nor can I help being amazed, that amidlt the ahnoft infinite num- , ber of modern faints who' croud and difgrace their chur¬ ches, no altar has yet been dedicated to the Maid of Orleans.” See France, N° ioi. The bridge was new built in the 18th century, and opened in 1760 ; and the French efteem it the fmelt in the world. E. Long. X. 59. N. Lat. 47. 54. Orleans, Peter JofejJi, a French Jefuit, and author of Hi/loire des Revolutions d'Angleterre, was born at Bourges in 1641. He taught belles lettres for feme time in his fociety, but afterwards devoted himfelf to the writing of hi dory. This purfuit he continued dll bis death, which happened in 1698. He wrote alfo a hiitory of the Revolutions of Spain ; A Hiftory of Two conquering Tartars, Chunchi and Camhi •, The Life of Father Coton, &c. His Hiftory of the Revolutions in England, under the family of the Stuarts, from the year 1603 to 1690, was tranflated into Englilh, apd publilhcd at London, 171D in one vol. 8vo : to which is prefixed an Introduction, by Laurence Echard, M. A. who fays, that “ the great varieties and wonderful chan¬ ges in thefe reigns are here judicioully comprifed in a moderate volume with no lets perfpicuity than ftrictnefsj and with a beautiful mixture of Ihort charafters, nice redeftions, and noble fentences, which render the whole agreeable and inftruftive. But while the reader is en¬ tertained with fo much {kill and finenefs, we ought to caution him with relation to the education and religion of the author y for though he has great marks of a ge¬ nerous candour, and a laudable deference to all fupe- riors •, yet he is to be conftdered, in all places, as one in favour with the French king, and not only % true papift, but a complete lefuit.” ORLOPE, in the fea language, the uppermoft fpace or deck in a great (hip, reaching from the main to the mizen maft. In three-deck fhips, the fecond and loweft decks are fometimes called orlopes. ORMOND, the northern divifion of the county of Tipperary, in the province of Munfter in Ireland. For a long time it gave the title of earl, and afterwards of marquis and duhe, to the noble family of Butler, de- feended from a lifter of Thomas a Becket archbifhop of Canterbury •, till, at the acceflion of George 1. the laft duke was attainted of high treafon, and died abroad. In that part of the country the family had great prero¬ gatives and privileges granted by Edward III. ORMSIDE, a fmall town of England, near Apple¬ by, in Weftmoreland. A great number of veffels of brafs, feme of which feemed to have been gilt, were difeovered near the manor-houfe, by the water wafhing away the foil. ORMSKIRK, in Lancafliire, in England, is a hand- fome town, with a good inland trade. By the late in¬ land navigation, it has communication with the rivers O II N Ribble, Oufe, Trent, Darwent, Severn, Crcifkirk Humber, Thames, Avon, &c. which navigation, inclu- . eluding its windings, extends above 500 miles, in the * counties of Lincobi, Nottingham, York, Lancaiter, > y——a Weftmoreland, St; .iord, Warwick, Leicefter, Oxford, Worcefter, &c. There is a bituminous earth about this place, from which oil of amber is extracted, that pre- ferves raw deih, and ferves the poor people inftead of candles. There is nothing remarkable at Ormflurk, but the monuments of iome of the ancient family of the Stan¬ leys before they eve re ennobled. Not far from it is Latham Houle, to which belongs a large eftate, and a tine park. It is remarkable only becaule it was gal¬ lantly defended in the civil wars by Lady Charlotte countefs of Derby, who held it to the laft extremity againft the parliament forces, who could never oblige her to capitulate. She held out glorioufly till die was relieved by Prince Rupert. It was, however, ruined in a fecond liege ; and fold by the family to Sir Thomas Bootle, who built a very magnificent houle upon it. ORMUS, a fmall ifiand of Alia, at the bottom of the gulf of the fame name, at the entrance of the gulf of Perfia. It is about two leagues from the main land^ and about fix leagues in circuit. They catch excellent oyfters about the ifiand j audit yields plenty of fine white fait; alfo a kind of fhining black fand, ■which is ufed for dulling writings, and is tranf- ported in confiderable quantity to Europe. There is • neither fvveet water nor grals upon it, the foil being of a fait fulphureous nature. It wras taken by the Por- tuguefe in 1507, who fortified it; and it was after¬ wards frequented by a vail number of merchants, who were extremely rich. In 1622 the Perfians, by the affiftance of the Englilh, conquered this place, and demolilhed the houfes, which were 4000 in number, containing 40,000 inhabitants. Some time after, the Perfians rebuilt the fort, and placed a garrifon in it ; but they could never bring it to be a place of trade as before : however, it is the key of the Perfian gulf, as well on account of the importance of the place, as the commodioufnefs of the harbour. It is now almoft deferted, for it produces nothing but fait, which fome- times is two inches deep upon the furface of the earth. E. Long. 56. 25. N. Lat. 27. 20. ORN1THI./E, a name given by the ancients to certain winds, which ufually blew in the fpring, at the time when the birds of pafiage came over to them. Pliny fays, that thefe winds blew from the weft, and that by force the Etefian winds were called by this name. Others fuppofe that they blew from the north, or north-weft. ORNITFIOGALLUM, Star of Bethlehem; a genus of plants belonging to the hexandria clafs ; and in the natural method ranking under the 10th order, Co~ ronarice. See Botany Index, ORNITHOLOGY. [ 467 ] o R N I T H O L O G Y. INTRODUCTION. « s \mn rT1HE tei-m Ornithology is derived' from the Greek e ”l ' X a bird, and *97®?, difeourfe, and denotes that part of Zoology which treats of birds. Birds are two-footed animals, covered with feathers, and furhilhed with wings. Like quadrupeds and the cetaceous tribe, they have warm blood, a heart with two ventricles and two auricles, and lungs for the purpoie of refni ration j but they are dilfinguifhed from both by their feet, feathers, wings, and horny bill, .as well as by the circumitance of their females being ovipa¬ rous. Ornitholo- The elegant and beautiful colouring of many of the gical writ- feathered race, the graceful eafe of their flight, thsh eis. various tnulic, their tender folicitude for their offspring, their engaging imlincts, their fufeeptibility of domerti- cation, and their fubfervience to the fuflenance of man, have, in all ages, contributed to intereft the latter in the ftudy of their hillory. 3 Of the naturalifts, however, whofe writings have de- antl PHny. feended to us from antiquity, Ariftotle and Pliny are the only two v,Tho appear to have entered into any de¬ tails on a fubjeft fo inviting and important. Though the former cornpofed no particular treatife on birds, he brings them under review in diflerent parts of his Hi- flory of Animals. In the third chapter of the eighth book, for example, he enumerates the different fort s of nouriihment adapted to different fpecies, and their va¬ rious modes of feeding. The ninth book contains his very imperfedl nomenclature, his remarks on the diveri¬ fied modes of nidi'ication, and feme valuable obferva- tions on the family of eagles. His notion of the orga¬ nization and habitudes of birds are interfperfed in the body of the work, and introduced in the way of com¬ parative reference to the ftrufture and manners of other animals. Pliny’s enumeration of the feathered fpecies, is extended over moft part of his tenth book, but is de- flitute of precife defeription, and encumbered with ab- furdity and fable. Of the numerous ornithologifts of more modern date, fome have chiefly direfted their labours to method and claflification, others have been more folicitous to deferibe and delineate •, fome have treated of the whole clafs, others of particular portions of it •, while, lailly, lome have been contented to define and deferibe, and others have illuftrated and enhanced their text by more or lefs accurate defigns from living or prepared fpecimens. This combination of the pen and the pencil, which has fo eminently contributed, in our day, to the acquifition and diffufion of knowledge, feems to have been unknown to the ancients. Although the unavoidable limitation of our plan pre¬ cludes a minute and crif» 1 report of the works to which we have jufl alluded, we fliall briefly advert to a few of the moft confpicuous. Among the firft who ex¬ cited, on the continent, a tafte for the ftudy of ornitho¬ logy, and for a methodical diftribution of that portion 4 of fcience, we may mention Belon. Aware that nature Belon. is moft fuccefsfully contemplated in her own works, he travelled from the laudable defire of collecting informa¬ tion, and communicated to the world the refylts of his enquiries. His Hiftory of Birds, a thin folio volume* divided into feven books, or parts, and illuftrated by wooden cuts, wTas publifhed at Paris, in 1555' Hi* principle of claffification being chiefly founded on the circumftances of habitation and food, and only occafion- ally on external forms and characters, is obvioufly very defective 5 his deferiptions, though tolerably accurate, are, for the moft part too concife j and many of his plates are very inadequate reprefentations ot their origi¬ nals. It muft, at the fame time, be allowed, that he frequently fuggefts judicious views of his iubject } that he notes with ingenuity, the points of refemblance be¬ tween the human ikeleton and that of birds j that he has penned feveral paffages which may Hill be perufed with intereft and inftruction ; that the naivete of his manner is always pleafing, and that when we reflect on the pe¬ riod in which he flourifhed, he is entitled to no ordinary praife. _ 5 The celebrated Conrad Gefner, phyfician and profef- Gefner. for at Zurich, and contemporary with Belon, has devo¬ ted the third volume of his Hiftory of Animals to the department of ornithology. It is an erudite, but pon¬ derous tome, exhibiting alphabetical tables of the names of birds, in Hebrew-, Chaldee, Arabic, Greek, Latin, and moft of the fpoken languages of Europe.. His de¬ feriptions are compiled abridgements 5 but his referen¬ ces, at the dole of each article, are very numerous v for if any author of his acquaintance happen to mention a bird, his name and the paffage are duly commemorated.. Gefner’s arrangement differs in no reipeft from that of any common dictionary \ and few of his engravings are executed wdth corre&nefs. The curious reader wall probably be gratified with the perufal of his account of the art of rearing birds for falconry, the difeafes to which they are liable, and the remedies which the learned doctor preferibes. 6 The fame topics are difeuffed by Aldrovandus, a pay- AlJrovan- fician of Bologna, who availing himfelf of the writingsd1'3- of the two preceding naturalifts, added to their indi-r gelled itores, and compiled three folios, divided into 20 books, and illuftrated by wooden plates. His catalogue, however, fcarcely comprifes any birds but fuch as are natives of Europe, and by no means all even of thefe. He too implicitly adopts the vague diftinftions of Belon 5 and on various occafions, not only copies Ariftotle with fervility, but overlays his borrowed materials with a mafs of dark commentary. The motley complexion of the whole produdlion, in fan 32 Defmareft. Langlois, and retouched by the pencil of the original designer : while the eider L>idot has executed the typo¬ graphy, 'hi his belt style, on vellum paper. Each figure is as large as life, and is ufually drawn from a fpecimen in the higheft ftate of prefervation ; and in many cafes, an exaft reorelentation of the female oird has alio been obtained. ^Though the pre-eminent merit of the work con fids in the figures and deicriptions, it is in a tew inlhances agreeably diverfified by traits of character, which the amhor remarked in the living bird, and by fume interefling hints of a more general complexion, which his accurate and exteruive oblervation enaoled him to collect. We cannot, however, refrain from ex- •preillng a wiili, that he had been more liberal of his fy- nonymsand references, and that iie had treated lyitematic writers with a little more relpect. We (hould not for¬ get, that methodical nomenclature, though the refuit of art, and liable to many errors, is entitled at lealt to iub- ordmate regard, and an unfpeakable aid to the me¬ mory. Even if we fiiould concede to our innovating author the propriety of thole more fanciful airange- ments to which he manifefts a predilecdiou, it would Hill admit of doubt, whether, on the whole, they would more accord with gradations unequivocally indicated by nature. -Axe we certain that, amid her countlefs produc¬ tions, nature recognizes a tingle line of demarcation ? or, that the ftudy of ornithology would be effentially pro¬ moted by claffing the fifilet with the jays, or every indi¬ vidual furnhhed with parade feathers among birds of pa- radife ? The natural hiftory of tanagers, todies, and mana- kins, by Anleline Gaetan Detmarefl, with coloured engravings, from drawings by Paulina de Courcelles, pu¬ pil of Barraband, is another of thofe recent and fplendid productions of the Parifian prefs, which reflect fo much honour on the zeal, mduftry, and talle ot the French naturalifts. The paper, type, and figures, all befpeak the excellence of the refpedtive art ills who have produ¬ ced them, as well as the love of chafte and elegant _em- bellifhment which has prefided over the undertaking. The ornamental ftyle of the work, however, is not its foie paffport to our favourable notice. The expofition of the three genera mentioned in the title, is a fubject which calls for much critical refearch and laborious in- veftigation. M. Defmareft, without prefuming to ex¬ tricate the -whole nomenclature, lays down many import¬ ant diilinclions, and proceeds with circumfpeftion, !o far as his opportunities have enabled him to advance. “ Before we enter,” fays he, “ on the details of the fpecies, it may be proper to mention, that we fiiall limit our defcnptions to thofe which we have feen, and of which we have been enabled to exhibit figures. We ftiall, moreover, endeavour to analyfe, and if poffible, to unravel the references of authors. Should iuccefs thus far attend us, we conceive that we fuall have duiy performed the part of zealous naturalifts.” Pefides de- feriptions and plates of the male, the author has alio, not unfrequently, reprefented the female, or young of the fame fpecies, or an individual as it appears in the moulting ftate. His pages will afford lead entertain¬ ment to thofe, who delight to obferve the inftin&s and economy of the feathered race ; and who fhrink from the minute adjuftment of claflification and fynonymy. It ought, however, to be remembered that few authentic fa&s have been colle&ed relative to the hiftory of thefe. O L O G ¥. 471 foreign birds j and that though future travellers may Introduc- increafe the fcanty ftcck of interefting notices, the exer-, t tions of the prefent author may not a little contribute to v fyftematize and facilitate their obfervations. ^ The Natural Hitlory of Birds, by George Edwards,Edwards, in four quarto volumes, without auy reference to country or method, contains many excellent coloured defigns, and correct deferiptions ; and the fame remark applies to his Gleanings of Natural Hiftory, the moll confklerabie portion of which relates to birds. _ Several of his countrymen have expounded or deli- £rjtlfh or- neated the birds of our own ifland with more or lets feli- nithologifts, city of manner. The ornithological part of Pennant’s Britiih Zoology, Hayes’s Natural Hiftory of Britiftr Birds, -with their portraits accurately drawn, and beau- tifully coloured from nature *, Lord’s Natural Hiftory oi Britiih Birds, Lewin’s Birds of Great Britain, with their eggs, in three volumes quarto, Walcott’s Synopfis - of Britilii Birds, two volumes quarto, Bewick’s Hiftory of Britiftr Birds, with figures engraved on wood, &c. &c; are all entitled to critical notice ; but the limitation ol- our plan forbids us to dwell on them. We fhall, there¬ fore, dole this portion of our introdudtion by pointing to a work which feems not yet to have procured its due (hare of the public favour 5 we mean the Ornithological Montagu. Di&ionary, or Alphabetical Synopfis of Britiftr Birds, by George Montagu, F. L. S. &c. in two fmall octavo volumes. We are acquainted with few publications ot the kind that contain a larger quantity of accurate and important information within Inch a narrow compafs. - As a book of reference and confultation, it is well cal¬ culated to fait the occalions of ordinary readers, and even to convev inftruftion to the learned ftudetit. The fynopfis and fpecific deferiptions evince much diligence and accuracy ; and various articles are enriched by the refuit of nerfonal obfervation and extenfive travel. Sufficiently awars of the fallible indications of plumage, the writer is more folicitous to reduce than to multiply diftindions •, and in doubtful cHes, has fometimes had re- courfe to the unequivocal tell of diffedion. A few of the articles, however, are difmiffed with too much brevity, and the ftyle is very deficient in poliffi and corredneis. If any of our readers are defirous of procuring a more complete catalogue of works publiffied on ornithology prior to the year 1760, they will find it in Gronovins’s Bibliotheca regni dnimalis atque la hidei, ac redenjio auc- torum ei librorum qui de regno animah ct lapideo, metho- dice, physjee, &c. trciBant. _ 36 The Itrudure of the feathered tribes, and their ha-General ob~ bits of life, are wonderfully adapted to the various^ fundions which they are deftined to perform. The pointed beak, the long and pliant neck, the gently fuel- Su;t^e ling {boulder, the expanfive wings, the tapering tail, cbnforma_ the light and bony feet, are all wifely calculated to-af-tion. fift and accelerate their motion through the yielding air. Every part of their frame is formed for lightnefs and buoyancy •, their bodies are-covered with a foft and de¬ licate plumage, fo drfpofed as to proted them from the intenfe cold of the atmofphere through which they pafs; their wings are made of the lighteft materials, and yet the force with which they ftrike the air is fo great, as to impel their bodies forward with aftonilhing rapidity, while the tail ferves the purpofe of a rudder to dired them to the different oHjeds of their purfuit. The in- • ternal ftrudure of birds is no lefs wifely adapted to^ the - famm-v 472 Introduc¬ tion. 38 Nutrition. ORNITHOLOGY. fame purpofes ; all tlie bones are light and thin, and all the mufcles, except thofe which are appropriated to the movements of tire wings, are extremely light and deli¬ cate. The lungs are placed clofe to the back bone and ribs. The air, entering into them by a communication from the windpipe, paffes through, and is conveyed in¬ to a number of membranous cells which lie on the Tides of the pericardium, and communicate with thofe of the fternum. In fome birds, thefe cells are continued down the wings, and extended even to the pinions, thigh bones, and other parts of the body, which can be filled and diftended with air at the pleafure of the animal. The feathers, too, and particularly thofe of the wings, contain a great quantity of air. The almoft univerfal diffufon of this fluid in the bodies of birds is of infinite ufe to them, not only in their long and laborious flights, but likewife in preventing their refpiration from being flopped or inlerrupted by the rapidity of their motion through a refilling medium. Were it poflible for man to move with the fwiftnefs of a fwallow, the adiual re¬ finance of the air, as he is not provided with internal refervoirs fimilar to thofe of birds, would foon fuffocate him. Birds, like quadrupeds, may be divided into granivo- rous and carnivorous. The former are furnifhed with larger intefiines than thofe of the latter. Their food, which confifis of grain of various forts, is conveyed en¬ tire into the firfi fiorrach, or craw, where it undergoes a partial dilution by a liquor fecreted from the glands, and fpread over its fuvface. It is then received into an¬ other fpecies of fiomach, where it is farther diluted, af¬ ter which it is tranfmitted into the gizzard, or true fio¬ mach, confifting of two very ftrong mufcles, externally covered with a tendinous fubfiance, and lined with a thick membrane of prodigious power and ftrength, in which organ the food is completely triturated, and pre¬ pared for the operation of the gaftric juices. In order to afcertain the firength of thefe ftomachs, Spallanzani had recourfe to a great variety of ingenious experiments. Tin tubes, full of grain, were forced into the ftomachs of turkeys, and, after remaining 20 hours, -were found to be broken, compreffed, and diftorted in the moft ir¬ regular manner. In the fpace of 24 hours, the ftomach of a cock broke off the angles of a piece of rough jag¬ ged glafs, though, on examining the gizzard, no wound or laceration appeared. In a ball of lead were fixed 1 2 ftrong needles, with the points projecting about a quarter of an inch from the furface. Thus armed, the ball was covered with a cafe of paper, and forced down the throat of a turkey. The bird retained it a day and a half without manifefting any fymptoms of uneafinefs, and the points of all the needles were bro¬ ken off clofe to the furface of the ball, except two or three, of which the flumps projected a little. The fame interefting obferver relates, that he fixed 12 fmall and very {harp lancets, in a fimilar ball of lead, which was given in the fame manner to a turkey cock, and left eight hours in the ftomach, at the expiration of which the organ was opened j but nothing appeared ex¬ cept the naked ball, the lancets having been broken to pieces, and the ftomach remaining found and entire. Hence we may infer, that the ftones fo often found in the ftomachs of many of the feathered tribes, may powerfully contribute to tire comminution of grain and ftther hard fubftances which conftitute their food. 3 Granivorous birds partake much of the nature and Introduce difpofiticn of herbivorous quadrupeds, agreeing with tion* themfin the number of their ftomachs, the comparative - length and capacity of their inteftines, the quality of their food, and the gentlenefs of their manners. Con¬ tented with the feeds of plants, with fruits, infeCls, and worms, their principal attention is direCled to procuring food, hatching and rearing their offspring, and eluding the fnares of men, and the attacks of predaceous ani¬ mals. As they are generally tractable and e a lily do- mefticated, man has felected for his own advantage thofe which are moft prolific and profitable. Of thele the hen, goofe, turkey, and duck, are the moft confi- derable, and form a valuable ftore of rich, wholefome, and nutritious food. Carnivorous birds are provided with wings of great length, the mufcles which move them being proportion¬ ally large and ftrong, fo that they are enabled to keep long on the wing, in fearch of their prey. They are, befides, armed with ftrong hooked bills, and iharp and formidable claws. They have large heads, ftrort necks, ftrong and brawny thighs, and a fight fo acute and piercing, as to enable them to view their prey from the greateft heights in the air, and to dart down on it with incredible iwiftnefs and undeviating aim. Their fto¬ machs are fmaller than thofe of the granivorous kinds, and their inteftines are much (horter. The analogy between carnivorous birds and quadrupeds, is too ob¬ vious to efcape the notice of even the fuperficial obfer¬ ver. Both of them are provided with weapons which indicate deltruflicn and rapine, their manners are fierce and unfocial, and they feldom congregate, like the in- offenfive granivorous tribes ; but, when not on the ' wing, retire to the tops of fequeftered rocks, or to the depths of extenfive forefts, where they conceal them- felves in fullen and gloomy folilude. Such of them as feed on carrion, have the fenfe of fmelling fo acute, that they can fcent carcafes at aftonifliing diltances. Without the means of conveying themfelves with pjj j|t9anj great fwiftnefs from one place to another, birds could migration, not eafily fubfift, the food which nature has provided for them being fo irregularly diftributed, that they are obliged to take long journeys to diftant parts in order to procure the neceffary fupplies. Hence one caufe of of thofe migrations which are fo peculiar to the feather¬ ed race. Befides the want of food, however, two other caufes may be affigned, namely, the want of a proper temperature of air, and of a convenient fituation for the important work of breeding and rearing their young. Such birds as migrate to great diftances, are alone de¬ nominated but moft fpecies are more or lefs fo, although they do not move to places remote from their former habitations. At particular periods of the year, moft birds remove from one country to an¬ other, or from the more inland diftrifts towards the {bores, or vice verfa. The feafons of thefe migrations are obferved with the moft aftonifhing order and punc¬ tuality ; but the fecrecy with which immenfe flocks take their departure, and the fuddennefs with which they reappear, are not eafily explained. We are alfo apt to luppofe, that, during long flights over immenfe tra6ls of water, the means of fubfiftence would inevita¬ bly fail, without rcftecling on the fuperior velocity with, which birds are carried forward in the air, and the eafe with which they continue their exertions for a much longer O R N I T H Introduc. longer time than can be done by the ftrongeft quadru- tion. ped. Our fwifteft horfes are fuppofed to go at the rate 0f a mile in fomewhat lefs than two minutes; and there is one inltance on record of a horfe that 'went at the rate of nearly a mile in one minute, but only for one fecond of time. In fuch cafes an uncommon degree of exertion has been attended with its ufual confequences, debility, and a total want of power to continue that exertion j but the motions of birds are not impeded by limilar caufes, and they not only glide through the air with a quicknefs fuperior to that of the fwiftell quadrupeds, but can continue on the wing with equal fpeed lor a eonfiderable length of time. Now, if we can fuppofe a bird to go at the rate of only half a mile in a minute, for the Ipace of 24 hours, it will, in that time, have gone over an extent of more than 700 miles } which is iufficient to account for almoft the longed migration j and, if aided by a favourable current of air, there is reafon to believe, that it will perform the fame journey in a much thorter fpace of time. The wings of birds are fo conftru&ed, that, in Unk¬ ing downwards, they expand very cofifiderably, and, except that they are fomewhat hollow on the under liae, they form, in this aft, almolf two planes. 1 he mufcles that move the wings downwards are very large, and have been eftimated, in fome inftances, at not lefs than the fixth part of the weight of the whole body. When a bird is on the ground, and intends to fly, it takes a leap, ftretches its wings from the body, and ftrikes them downwards with great force. By this ftroke, they are put into an oblique direftion, partly upwards, and part¬ ly horizontally forwards. That part of the force which tends upwards is deftroyed by the weight of the bird, while the horizontal impulfe ferves to carry it forwards. The ftroke being completed, it moves its wings ; and they, being contrafted, and having their edges turned upwards, meet with very little refiftance from the air. When they are fufticiently elevated, it makes a fecond ftroke downwards, and the impulfe of the air again moves it forward. Thefe fucceflive ftrokes aft as fo many leaps taken in the air. When the bird wants to turn to the right or left, it ftrikes ftrongly with the op- poftte wing, fo as to impel the body to the proper iide. If it wants to rife, it raifes its tail, and if to fall, de- prefles it. When in a horizontal polition, the tail keeps the body fteady. A bird, by fpreading its wings, can continue to move horizontally in the air for fome time, without ftriking, becaufe it has acquired a fufficient velocity ; and the wings, being parallel to.the horizon, meet with but fmall reliftance. On alighting, it expands its wings and tail full againft the air, that they may meet with all poffible reflftance. i he centre of gravity in birds is fomewirat behind the wings } and, to counterbalance it, moft of them may be obferyed to thruft out their head and neck in flying. I his is very apparent in the flight of ducks, geefe, and feveral fpe- cies of water-fowl, whole centre of gravity is farther backwards than in the laird birds. In the heron, on the contrary, whole long head and neck, although folded up in flight, overbalance the reft of the body, the long legs are extended, in order to give the proper counter- poife, and to fupply what is wanting in the fhortnefs of 40 the tail. lubrication The feathers of birds would conftantly imbibe the of tiit tea- moifture of the atmofphere j and, during rain, abforb theIS- VOL. XV. Part II. O L O G Y. 473. fo much wot, as would almoft, if not wholly, impede Introduc- their flight, had not the wTife economy of nature obvi-, tlon- t ated this by a moft effeftual expedient. I hey are fur- niftred on the rump with two glands, in which a quan¬ tity of unftuous matter is conftantly fecreting. 1 his is occafionally prelied out by means ol the bill, and ufed for the lubrication of the feathers. The birds which lhare, as it were, the habitations of man, and live prin¬ cipally under cover, do not require fo large a fupply of this fluid, and, confequently, are not provided-with fuch a large flock of it as thofe that rove abroad, and refide in the open element. Hence poultry, when wet, af- fume a ruffled and uncomfortable appearance. 4I As birds are continually palling among hedges and Niftitatiug thickets, their eyes are protefted from external injuries, membrane, as well as from too much light, when flying in oppofltion to the fun’s rays, by a niftitating or winking mem¬ brane, which can at plealure be drawn over the whole eye like a curtain. This covering is neither opaque, nor wholly pellucid, but fomewhat tranfparent. By means of it the eagle is faid to gaze at the iun. It appears from obfervations, founded on numerous cong experiments, that the peculiar notes, or fong, of the different fpecies of birds, are altogether acquired, and are no more innate than language is in man. The at¬ tempt of a neftling to fmg, may be compared with the imperfeft endeavour of a child to talk. The firft ellay feems not to poffefs the iiighteft rudiments of the future fong 5 but, as the bird growls older and ftronger, it is not difficult to perceive its aim. While the fcholar is thus endeavouring to form his fong, when he is once fure of a paffage, he commonly raifes his tone, which he drops again when he is not equal to what he is at¬ tempting. A common fparrow, taken from the neft when very young, and placed near a linnet and gold¬ finch, though in a wild ftate it would only have chirp¬ ed, adopted a fong that w7as a mixture of thefe two. Three neftling linnets were educated, one under a Iky- lark, another under a wood-lark, and a third under a tit-lark j and, inftead of the fong peculiar to their own fpecies, they adhered entirely to that of their refpeftive inftruftors. A linnet, taken from the neft, when but two or three days old, and brought up in the houfe of an apothecary at Kenfington, from want of other lounds to imitate, almoft articulated the wmrds “ pretty boy,” as well as fome other fhort fentences. Thefe and other well-authenticated fafts feem to prove, that birds have no innate notes, but that the language of thofe to whofe care they are committed at birth, will be the language wfflich they adopt in after life. It may, however, ap¬ pear fomewhat unaccountable why, in a wild ftate, they adhere fo fteadily to the fong of their owm fpecies only, when fo many others are to be heard around them. This arifes from the attention paid by the neftling bird to the inifruftions of its own parent only, generally dif- regarding the notes of all the reft. Perfons, however, wTho have an accurate ear, and have ftudied the notes of different birds, can very often diftinguilh fome that have a fong mixed writh thofe of another Ipecies ; but thefe are in general fo trifling as fcarcely to be reckoned any thing more than mere varieties of provincial dialefts. All birds are oviparous, or produce eggs, fromE which, after the procefs of incubation, the young are extruded. Thefe eggs differ in different ipecies, in re- fpeft of number, figure, and colour. They contain the 3 O ..v... rudiments. 44 Nefts. 45 474 O R N I T H Introduc- rudiments of tlie future young, for the maturation of i tl°n' which a bubble of air is always placed at the large end, betwixt the {hell and the infide {kin. It is fuppofed, th^t, from the warmth communicated by the fitting bird to this confined air, its fpring is increafed beyond its natural tenor, and at the fame time its parte are put into motion by the gentle rarefaction. Hence prellure and motion are communicated to the parts of the egg, and feem, in fome unknown way, gradually to promote the growth of the young till the appointed time of ex- cluhon. -Houfewives, when they iufpect an egg is not good, put their tongue to the great end, to feel if it be warm. If that is not the cafe, it is conlidered a certain proof, that the air, having, by degrees, effedted its efcape, the egg is at length become putrid or ad¬ dled. The nefts of birds are, in general, conflrudled with aftonilhing art, and with a degree of {kill and neatnefs that often defies the efforts of the human hands. Both the male and female generally affift in this interefting concern. They each bring materials to the place, as flicks, mofs, flraws, &c. for the foundation and exte¬ rior ; and hair, wool, or the down of animals or plants, to form a foft and commodious bed for their eggs, and for the tender bodies of their young when hatched. The outfide of the neft ufually bears fo great a refem- blai ice in colour to the furrounding foliage or branches, as not eafily to be difeovered even by perlbns who are in fearch of them. The term of life varies greatly in birds, and does not feem to bear the fame proportion to the time of acquir¬ ing their growth as has been remarked with regard to quadrupeds. Moll birds acquire their full dimenlions in a few months, and are capable of propagation the firft fummer after they are hatched. In proportion to the fize of their bodies, they poffefs more vitality, and live longer, than either man or quadrupeds. Notwith- llanding the difficulties which arife in afeertaining the ages of birds, there are inftances of great longevity in many of them, particularly geefe, fwans, ravens, and eagles, which have been known to attain to the age of feventy, fourfeore, or even a century. Pigeons ufually live more than 20 years, and even linnets and other fmall birds have been kept in cages for nearly the fame period. The difeafes to which birds, in their natural ftate, are incident, are probably neither numerous nor formidable ; at leaf! we feldom meet with individuals of the feather¬ ed race which feem to labour under ficknefs or infirmi¬ ty. In our northern latitudes they are indeed frequent¬ ly fubjefted to the preflure of cold and hunger ; but the debility and other fymptoms attendant on thefe ex¬ ternal accidents, hardly deferve to be noticed in a nofo- logical point of view. Seclufion from the open air, and a total change of habits, induced by confinement and domeftication, are ufually accompanied by appropriate diforders, fuch as the pip, or fwelling on the extremity of the tongue, a foftening of the bill, a gradual decay of the feet, convulfions, and general pining. The moulting procefs, from which none of the fpecies are exempted, may alfo be regarded, in fome meafure, as a difeafed ftate of the animal. All birds moult, or call their feathers once, and fome twice, in the courfe of a year. This change takes place in autumn, or in the feafon which conefponds to it in different climates, and . 46 Difeales. O L O G Y. uniformly after the breeding feafon. Thofe which moult twice a year, alfo change their feathers in fpring. Moft of the young males, which bear originally the plumage of the mother, affume, at their fin ft moulting, the colouring which they afterwards retain 5 but fome fpecies do not put on their chara&eriftic garb till the. end of the fecond, or even of the third year. Among thofe which moult twfice a year, both males and females change their plumage ; but the latter retain the fame markings, while the former exhibit a more gaudy co¬ vering in the feafon which precedes their pairing, and a mere fober one, often fimilar to that of the female, af¬ ter the period of breeding. In moft cafes, the feathers fall off in gradual fucceffion 3 but in fome fpecies nearly the whole plumage comes off at once, and is fpeedily replaced. This periodical affection is always attended wdth more or lefs languor and depreffion. For the anatomy of birds, we beg leave to refer to Anatomy, the article Comparative ANATOMT; and {hall clofe this introdudlion by a brief explanation of fome of the moft , important technical terms in ornithology, employed by Technical Pennant and Linnseus. terms. Fig. 1. Cere (Cera, Lin.),—the naked fkin wdrich 1'Iate covers the bafe of the bill in the haw k kind. CCCXCII. 2. Capiftrum,—a word ufed by Linnaeus to exprefs ^ r“ the ffrort feathers on the forehead juft above the bill. In fome birds, thele feathers fall forward over the no- ftrils : they quite cover thofe of the crow. 3. Lore (Lorum, Lin.),—the fpace between the bill and the eye, generally covered with feathers ; but, in fome birds, as in the black and white grebe, naked. 4. Orbits (Orbita, Lin.),-—the Ikin that furrounds the eye, which is generally bare, particularly in the he¬ ron and parrot. 5. Emarginated (Emargiaatum),—faid of a bill, which has a fmall notch near the end, as that of the butcher bird, thruffi, &c. 6. Vibrifjee pedhnatee,—ftiff hairs which grow on each fide of the mouth, formed like a double comb, as in the goatfucker, ffy-catcher, &c. 7. Alula fpuna, Spurious or bajlard wing,—a fmall joint riling at the end of the middle part of the ufing, or the cubitus, on which there are three or five fea¬ thers. 8. Te&rices primer, Lejfer wing-coverts,—the fmall feathers which lie in feveral rows on the bones of the wings. The under coverts are thofe that line the in¬ fide of the wings. 9. Te&rices fecundee. Greater coverts,—the feathers, wdrich lie immediately over the quill-feathers and the, fecondaries. 10. Primores, Quill-feathers ox Primaries,—the lar- geft feathers of the wings, or thofe that rife from the firft bone. 11. Secundarice, Secondary feathers or Secondaries,— thofe that rife from the fecond bone. 12. Tail-coverts, {Vropygiuiri),—thofe which cover the bafe of the tail on the upper fide. 13. Vent-feathers (Crifumf—thofe which lie from the vent to the tail, underneath. 14. Re&rices, Tail-feathers. 15. Scapulars, or Scapular feathers,—thofe which take their rife from the ftioulders, and cover the fides- of the back. 16. Nucha,—the hind part of the head. 'I* O R N I T FI 17. Stilu/alum, tubulated or aw/Jhaped,—applied to a bill that is ftraight and flender, in the form of an awl. 18. Pes ambulator his,—all the toes divided to the bottom. 19. Pes grejforius,—the outer toe more or lefs united to the middle one, particularly confpicuous in the feet of the king’s fifher. 20. Pes Jean for ins,—formed for climbing, like the foot of the woodpecker. 21. Pes lobatus,—finned, or lobed, like thofe of the grebes. 22. Pes pinnatus,—pinnated, or fcolloped. The webs indented in the fides, as in coots and fandpipers. 23. Pes tridaclylus, or curforius,—wanting the back toe. 24. Pes didaEhjlus,—compofed of only twro toes, as in the oftrich. 25. Pes femi-palmatus, Semi-palmated,—when the webs reach only half the length of the toes. 26. Ungue pq/Uco fejjili,—when the hind claw ad¬ heres to the leg wuthout any toe, as in the petrels. 27. Digitis qualuor omnibus palmatis,—all the four toes connefled by webs, as in the corvorant. Rojlrum cultratum,—w-hen the edges of the bill are very iharp, as in that of the crown 28. Unguiculatum,—faid of a bill furnifhed with a nail at the end, as thofe of ducks and goofanders. O L O G Y. 475 29. Lingua ciliata,—a tongue edged with fine bridles, Introduc- like that of the duck. , , 30. Integra,—plain, or even. ——y— 31. Lu fabric iformis,—when the tongue is long, round, and (lender, like a worm, as that of the wood¬ pecker. Pedes coffipedes,—when the legs are placed fo far be¬ hind as to make the bird wralk with difficulty, or as if in fetters, of which we have examples in the auks, grebes, and divers. 32. Nares lineares,—wrhen the noftrils are very nar¬ row, as in fea gulls. 33. Emarginatce,—wath a rim round the noftrils, as in the flare. Iris, is that part which furrounds the pupil of the eye. Mandibles, denote the upper and under parts of the bill. Compreffed,—vertically flattened at the fides. Deprejfed,—horizontally flattened. Caruncula,—a fleffiy excrefcence on the head. Hypochondria,—the hinder fides of the bread and ab¬ domen. Ocellated,—wfith roundifh concentric fpots, of differ¬ ent colours. Phalanges,—the articulations of the toes. SYSTEMATIC EXPOSITION of the CLASS. 49 ACCORDING to the Linnaean method, the clafs of C1S' Aves, or Birds, is didributed into fix Orders, denomi¬ nated Accipitres, Piece, Anjeres, Grallce, Galhnce, and Pajferes. Accm- Order I. ACCIPITRES. TRES. This natural order includes birds of prey, that have the bill fomewffiat hooked dowmwards, the upper man¬ dible dilated near the point, or armed wath a tooth, the noftrils wade, the feet (hort and ftrong, wath four toes, three of which are placed forwards, and one behind 5 toes warty under the joints ; claws hooked and (harp- pointed. They live on other animals alive or dead, and are themfelves not eatable. They are monogamous, or live in pairs. The females are larger and more beauti¬ ful than the males, and generally lay about four eggs. This order includes vultur, falco, frix, and lanius. Vultur. Gen. 1. Vultur, Vulture. Character ftraight, hooked at the point 5 head bare of feathers. Birds of this genus are diftinguiffied from eagles and hawTks, by being gregarious, by the comparative heavi- nefs of their flight, and by their living on carrion. The females, too, are hardly larger than the males. Unlefs preffed by hunger, they feldom attack living animals j they fly flowly, unlefs when very high in the air, and have an exquifite fenfe of fmell. The tongue is large and fleffiy •, the legs and feet are ftrong, and moftly co¬ vered w ith feales j and the wings are lined, on the in- (ide, with down. Gryphus. Condor, condur, or cuntur.-—Very large, wath a ca¬ runcle on the crowoi of the head, the ■whole of its length 5 the throat naked. Quills of the wings two feet and a half long, and an inch and a half thick •, body black, back white j neck ruffed with long white feathers} throat red •, head brown, and wToolly ; eyes black, irides chefnut $ bill black, but tipt with wffiite ; feet black } clawrs ftraightiffi } tail fmall.—The female differs from the male, in having a tuft on the neck, in its browoi co¬ lour, and in having no ruff. Briffon, however, has pro¬ perly remarked, that the plumage of this fpecies varies in colour, a circumftance which wall, in fome meafure, account for the difeordant deferiptions of different au¬ thors. At the fame time, we muft regret, that the hi- ftory of this enormous bird is fo imperfe£tly known. Its extent of wdng is varioufly dated, from nine to eighteen feet} and, wffiile Frefier aferibes to it fufficient ftrength to carry off (heep, and boys of ten years old, Marco Paolo fturdily affirms, that it can lift an elephant from the ground high enough to kill it by the fall. Though very rare, Buffon fufpefts that it is not confined to South America, and that it does not effentially differ from the roc of the eaftern nations, fo famous in the A- rabian tales} nor from the laemmer geyer of the Ger¬ man Alps. A preferved fpecimen in the Leverian Mu- feum mea fared ten feet, from the tip of one wing to that of the other. It is deferibed and figured in the fecond fupplement to Latham’s Synopfis. In Chili, the con¬ dors make their nefts among the moft inacceffible rocks, and lay two wffiite eggs bigger than thofe of a turkey. They feed on dead carcafes, and fometimes prey on (heep, goats, or even young calves, wffien they ftray far from their dams, falling on them in flocks, plucking out their eyes, and tearing them in pieces. The country people 3 O 2 ufe *0: Papa. 55 476 O R N I T II Accipitres. ufe every means lo deflrcy fuch formidable invaders of * v their property, and feem to have fucceeded in expelling 54 them from the populous diftrifts of both continents. King vulture, or king of the vultures.—Caruncles on the noitrils 5 crown of the head and neck bare of fea¬ thers. The extreme length of the body does not ex¬ ceed two feet three inches, and it is not thicker than the hen turkey. Its wings are Ihort in proportion to the other vultures. The bill is thick and Ihorf, and be¬ gins its curvature only at the point; in feme individuals it is entirely red, in others only red at the extremity, and black in the middle. In the cere, which is broad and orange-coloured, are placed the noitrils; and be¬ tween them the {kin projects like a loofe jagged comb, falling indifferently on either fide, according as the bird moves its head. Under the naked part of the neck is a collar, or ruff, compofed of pretty long foft feathers of a deep afh colour, and fo broad, that when the bird contracts itfelf, it can conceal the neck and part of the head like a cowl, whence fome naturalifts have given it the name of monk. The feathers on the breaft, belly, thighs, legs, and the under furface of the tail, are white, {lightly tinged with yellow •, thofe of the rump and upper furface of the tail, are black in fome indivi¬ duals, and white in others. The other feathers of the tail are always black, and fo are the great feathers of the wings, which are commonly edged with grey. The king of the vultures is a native of South America and the Weft Indies, and lives on carrion, rats, lizards, fnakes, and excrements of all kinds, from which circum- ftance it has a moft offenfive odour. •Aura. Carrion vulture, or turkey buzzard {carrion crow of Jamaica).—Body gray brown j quill feathers black 5 bill white } the fides of the head wurted ; legs flefii-coloured. —Common in the W. Indies, and in N. and S. America. Somewhat larger than the black eagle. Is protected in A- merica for its ufe in devouring dead carcafes and ferpents, which it does, along 'with dogs, in the greateft harmony. It will feize meat from the Ihambles, breathes a moft fetid odour, and, when taken, vomits up an intolerably {link¬ ing matter. Roofts by night, in flocks, on the higheft branches of trees. They are generally very tame in their wild ftate, probably owing to their being more ca- 56 refled than molefted by man. Leucoce- White, ajh-coloured, or Angola vulture.—Body fnowry •, ■phalus. quill and tail feathers black } collar white 5 head and lower part of the neck covered wTith white dowrn ; middle toe covered with 11 diflinct feales 5 cknvs black. About the fize of a female turkey. The female exceeds the male in fize, and differs chiefly in being lefs tinged with reddifli. The young have the whole of the naked parts about the head covered with a grayifli down.—This fpe- cies is ufually feen in pairs, and not in large flocks, like many of the genus •, or, if 10 or 12 alight on one car- cafe, they are accidentally allured by the fmell, which a£ts on their delicate organs at inconceivable diftances. They feed on all manner of carrion, and on lizards, Jnakes, frogs, and even excrements. They build among the rocks, and lay four eggs. In fome parts of Africa they are very common, and in others more rare. The natives tame and refpeft them, as they contribute to rid their grounds of nuifances. They likewife occur in Norway and Sardinia. Mr Latham fuppofes that this fpecies is the vautour de Norvege of Buffon ; xha facre dEgifte of the fome author^ perhaps the Angola vul- o L o G Y. ture of Pennant, and the rachamah of Bruce. “ When, Arcipitr«s. however, (adds this celebrated omithologift), the divi- v fion of the vulture genus into real Ipecies may take place, is not for us to detennine \ the variety among in¬ dividuals, from different periods of life, as well as the different appearances of thofe in a ftate of confinement, to what the plumage lias, w hen at large, cannot fail to create no {’mail difficulty j added to that, very few tra¬ vellers are naturalifts in a fufficient degree to diferimi- nate one part of nature from another ; befides, the fub- jefts in queftion being moftly extra European, we can¬ not w onder at being fo long in the dark.” 57 Aquiline or Alpine vulture.—The male of this fpecies Percuoptc- is almoft wholly white 5 quill feathers black, with hoary' edges, except the two outermoft, which are wholly CCCXCIII. black. The female is all over browm, with the four pjg K outer quills black. In both the bill is black ; cere yel- low j noftrils conftantly dripping moifture 5 feet naked. Inhabits Egypt, Paleftine, Syria, and Perfia. They fly in large troops, and are extremely ufeful in deftroy- ing mice, with which fome countries, of which they are natives, are infefted, fuch as Paleftine. The fame fpe¬ cies, it is faid, inhabits the Swifs Alps, w7here they are of an immenfe fize. Some have been meafured exceed¬ ing 12 feet from tip to tip of the wings. 5S Gen. 2. Falco, Falcon. Falco. Bill hooked, and furnilhed with a cere at the bafe j head covered with clofe-fet feathers; tongue bifid. 59 Though the birds of this genus are all carnivorous’ Character, they feldom feed on carrion, except when preffed by hunger, which they can endure for a long time. They have a very acute fight, and pounce down on their prey with aftonilhing fwiftnefs and force. From their great ftrength, they are capable of carrying birds nearly as heayy as themfelves, to a great diftance, for provifion to their young. Their middle toe is {lightly connected with the outermoft. A. Bill hooked only at the point, bearded at the bafe with extended bri/lles. ^ Snake-eater, or fecretary vulture.—Body black; hhid- Scrpentari- head crefted; tail feathers wdfite at the tips, the two ns‘ middle ones longeft ; legs very long. Bill black, cere white ; orbits orange, and naked ; irides pale cinereous ; tail rounded ; legs browmifti ; claws ftiort, black, hook¬ ed, not very {harp ; creft capable of being eredled or depreffed.—In feizing its prey, this bird makes ufe of its wings, with which it inflifts violent blows by means of a bony protuberance at the bend of the wing. It is alfo by its wings that it defends itfelf againft^the bites of venomous fnakes, until the latter, tired with their ef¬ forts, or nearly bruifed to death, are eafily difpatched. This fpecies likewdfe preys on turtles, lizards, and even grafhoppers and other infedls. When in a domefticated ftate fcarcely any kind of food comes amifs to it; and, if young birds are prefented to it, it wall take them by the bill foremoft, and fwallow them whole. One of thofe which Le Vaillant killed, had 21 young turtles, 11 fmall lizards, and three fnakes, in his ftomach. Like other birds of prey, it is obferved to bring up the undi- gefted parts of its food, in the form of round pellets. In pairing time, two males will often be found engaged in a violent conteft for a female. The fecretary vulture ORNITHOLOGY. A.-cipitres. is three feet high, remarkable for the length of its legs, ' v and inhabits interior Africa and the Philippine ifiands. Thefe birds make a Hat neft, like that of the eagle, full three feet in diameter, lined with wool and feathers, in fome high tuft of trees, and ufually concealed from ob- 61 fervation. Harpeyia. Crefied or Oronooho eagle.—Head crefted with long feathers j body beneath variegated 5 eyes with a ni£H- tant membrane. Under the crop, wdrite feathers, which, when the bird is irritated, fall to the ground. Erefts the creft in the form of a coronet, is faid to be able to cleave a man’s Ikull at a flroke. Inhabits Mexico, Bra¬ zil, and other parts of South America, and is as large <52 as a flieep. Albicilia. Cinereous or white-tailed eagle : erne of the Scots.— Cere and feet yellow; tail feathers wdiite, the middle ones tipt with black •, head and neck pale cinereous \ irides and bill pale yellow; noftrils, and the fpace be¬ tween the eyes, bluifh, with a few briftles ; body and wings cinereous, mixed with brown 5 tail white 5 legs, below the knees, downy, gloffy yellow •, clpws black. —Size of a turkey, feeds on birds and filh. Inhabits Eu¬ rope, and frequently occurs in Scotland and the Orkney illands. B. Feet generally feathered, of a large f%e. Black eagle.—Cere yellow ; feet yellow, and fome- W’hat downy •, body rufty black, with yellow ftreaks } bill horn colour, verging on blue •, irides chefnut •, exte¬ rior part of the tail wdiite, with blackhli fpots, tip whit- i(h } legs dirty white 5 toes yellow, claws black. Two feet ten inches long. Inhabits- Europe and America. Ofprey, or fea eagle.—Cere and legs yellow 5 feet half covered with down 5 body of a rufty colour •, inner vanes of the tail feathers white.—It is diftinguiftred by the colour and figure of its nails, which are of a ftiining black, and form an entire femicircle j by its legs, which are naked below, and covered with {mall yellow feales; and by the beard of feathers which hangs from the chin, and which has occafioned its receiving the name of the bearded eagle. It meafures, from the end of the bill to the point of the nails, three feet and a half, and its wings ex¬ pand to between fix and feven feet. It loves to haunt the lea ftiore, and often frequents inland trails, near lakes, marfties, or rivers that are flocked with fifti ■, but, though it preys on the finny tribe, it alfo attacks game, and, being large and ftrong, feizes and carries off geefe and hares, and fometimes even lambs and kids. It catches fifti even during the night, when the noife of its plunging into the water is heard at a great diftance. In attempting to lay hold of overgrown fifti, it is fometimes dragged under water, being unable to difengage its ta¬ lons. It inhabits Europe and North America, and was found by Captain Cook, in Botany iftand. It is not un¬ common in Scotland and Ireland. “ From the aftonifti- ing height (fays Mr Montagu), thefe and fome other birds fly, we are led to believe they are capable of liv¬ ing in a much lighter air than other animals. From the top of fome of the higheft mountains in Scotland we have feen feveral foaring together at fo great a diftance as to appear fcarcely larger than a {wallow.”—The fe¬ male fea eagle feldom lays more than two eggs, and 65 fometimes produces only a Angle young one. Cbryfcetos. Golden eagle.—Cere yellow ; fee* downy, and rufty- coioured) body dark brown, irregularly barred} tail 63 Melanx- tos. Plate cccxciii. Fig. 2. 64 OJJifragus All black, and covered with afti-coloured bars. It greatly Accipitres. refembles the preceding, but is diftinguiftred from it v'" ' chiefly by its legs, which are yellow, fhort, ftrong, and covered with feathers to the feet. The general length of this fpecies is about three feet and a half ; the breadth eight feet*, and it ufually weighs about twelve pounds. It breeds in the moft inacceflible rocks, and lays three or four white eggs. It inhabits Europe and Siberia, and is faid to be not unfrequent in the mountainous parts of Scotland, Ireland, and Wales, though it has been fre¬ quently confounded with the fea eagle It feeds on lambs, kids, and all kinds of game, and has been known to carry off infants to its neft. It is remarkable for its longevity and abftinence from food 5 fome having been kept in menageries for upwards of a century } and Pen¬ nant records an inftance of one which lived twenty-one days without any fuftenance whatever. It flies high, during ferene weather, and defeends nearer the earth in ftorms., 66 Ring-tailed, white-tailed, black, or common eagle.— Fuh tn ^ , g ’ tai1 l(fS and wedged ; legs long: hind claws longer than the reft. Fifeen inches long ; about the fize of a jay. Inhabits New Zealand, wlfere it is often feen walking on the ground, and fometii^s, though igoie rarely, perching on trees. It feeds on various kinds of berries and infeds, and even, according to mme, on fmall birds. Its note approaches to whiftfing air ometimes to a fort of murmuring that is not un’ pleafent. ,ts fleflt is eatable, and bf feme iiWed' Gen. 14. Corvus, Crow. Crow. Bill ftrong, upper mandible a little convex, edges cul-rr UX rated, and m moft fpecies, flightly notched nfar the "" tip ; noftnls covered with briftles refleaed over them • tongue divided at the end ; toes, three forward che backward^ tne middle one joined to the outer as far as the firft joint. 1 The greater number of this tribe are found in every enmate. They are _ prolific, focial, and clamorous3! building on trees; laying fix eggs; and living on grain’ eco,, unects, Uc. borne of them are apparentlyliurt- ful to agriculture; but their ufe in diminiftdng noxious occnfio:™016 11311 Counterbaiances the wafte which they Raven,—Black ; back of a blueifh black ; tail near I?3 ly rounded. Two feet two inches long. Varies with a CW. bcatte^e.d wlllte feathers, or is black and white or entirely wlute. A well-knowm bird, and native of Em rope, Afia, and America. Is hardy, cunning, voraci- ous, and yet patient of hunger. Preys on young ducks and chickens and even deftroys young lambs and fick- ly Fheep, by firft picking out their eyes. Smells carrion at a great diftance; gluts itfelf when an opportunity ofters retires to digeft, and returns again to feed I hough eafily domefticated, and taught to fpeak, it has a miichievous trick of purloining any thing glitterino- and concealing it. “ We have been allured, g(favs Mr Montagu) by a gentleman of veracity, that his butler haying miffed a great many filver fnoons and other ar¬ ticles, without being able to deteft the thief for fome time, at laft ooferved a tame raven with one in his mouth, and watched him to his hiding-place, where he found more than a dozen.” The raven ufually makes choice of the forks of the largeft trees to build in ; but many of them hkewife breed on rocky coafts, and neftle m die moft macceflible parts of them. At this time they are very bold, and will not allow even the falcon to approach their neft with impunity. The male and Female pair for life, and drive their young from their haunt, as foon as they are able to provide for themfeh es. 1 he female lays five or fix eggs, 0f a blue- ifh-green O R N I T H _ ifii-green colour, blotched and fpotted with brown and aili-colour, and fomewhat larger than thofe of a crow. Carrion crow.—Elueifh-black j tail rounded j tail feathers acute. Varied with fpottings of white, or en¬ tirely white ; bill black, irides dulky, legs black. Di- Ifingukhed irom the rook by the bill, which is rather more convex towards the end, and by the reflected brirties at the bafe being always perfect. Thefe marks however, are obvious only in adults, and in young birds’ the note is the only criterion, which in this is much more hoarfe than that of the rock. This fpecies weighs about nineteen ounces, and is eighteen inches lon