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Les diagrammes suivants illustrent la m^thode. 1 2 3 1 2 3 4 5 6 ) I ^^rplitatian OF Jamejb Qordon MagQre;c,or, .. M. A,,U,Sg,, F, R.S. Em f, as,G„ Munro Profem(yr of PhyHicH in D-TIMort. 53 XXXII. From W L. (J.x.DwiN, I). Sc. (Edin.), B. Sc. (Ix)nd.). Prqfi'iior of Chetniitry, Qufen'n Univtr»ity, Kingnton, 66 Ontario .\.\.Xni. From ,]. Trowbridok, H. D., Pro/emor of Phymlai, Harrnnl Viiivernty 56 XXXIV. From E. H. Mali,, Ph. D., A^niMant Projetsor of Phynirs, Harvard Univf.raity 67 XXXV. From E. L. Nkthols. B. S., Ph. I)., Projeitor of Phyncn, CorntU UniivrHity 68 XXXIV. A'lom T. C. Mendbnhali,, Suj>'rinttndent of the U. S. Coanf and Geodetic Survty, formerly Profenior of Phynicn ill ihr Ohio Statf University, Coiumhm, Ohio 59 XXXVII. From A. \l. KiM» i.\., A. B., Ph.D., Aanociatein PhyncH in the Johim f/oplnnn Univemity, Baltimore 60 .X .XXVIII. /^*om A. E. Krnnkixy, Electrician, Editon's Laboratory, Oratiye, X. J 61 XXXIX. From C. Barh.s, Ph D., Phyairal Laboratory, U. S. Geo- logical Surrry, Washington, D. C. 82 XL. From a. A. Pkuk.in.s, Ph. I)., Associate in Physics, Bryn Mawr Colh ge. Pa 63 I TO THE BOARD OF GOVERNORS OF gxccsm muiucvsittj. Gentlemen : . I W^ to offer myself as n can«li(luto for the Pro- fessorship of Experimental Physics in McCJill University. I am a native of Halifax, N. S., and entered Dalhousio College as an uiuha-^a-adimte in 1867, at the age of fifteen. After taking the highest academic position provided for by the regulations of the College at that time, I graduated as Bachelor of Arts in 1871. Three years afterwards I pro- ceeded to the Degree of Master of Arts. In 1871 I was awarded the Canadian Gilchrist Scholar- sliip by the Examiners of tlie London University, and decided to enter the B. Sc. course of t!mt University, and to study in Edinburgh. Tliere I spent the next three years, attending the Science classes, and working in the Natural Philosojjhy Laboratory under Professor Tait. Enccjuraged by my success in the Physical and Biological classes, 1 undertook to read for Honours in tlie de])artments of Experimental Physics and Biologj'. My health, however, broke down, and I yielded to the urijent advice of tlic Hon. D, McN. Parker, M. D., of Halifax, and Professor Grainger Stewart, M. D., of Edinburgh, not to incur the risk involved in tlie strain of the Ht)nours Examinations. In botli the 1st and the 2nd B. Sc. Examinations I was placed in the first division of the Pass List. I graduated in 1874 as Bachelor of Science. I spent the next two years at the University of Leipzig, continuing the study of Physics, and more especially of ■pami Electricity, under Professor G. Wiedemann, who was assisted in his Laboratory by his son, Dr. (now Professor) E. Wiedemann. In 1876 I graduated as Doctor of Science at the Univer- sity of London, in the brancli emljracinfj Electricity as principal subject, and Electro-Cheraistry, Heat and Mag- neti.sm as suV)sidiary sulijects. In the same year I was appointed Lecturer on Physics in this College, and in 1877 Cliief Physical Master in Clifton College, England. At Clifton College I conducted classes in Matiiematical and Experimental Physics, and in Physical LaV)oratoiy work. In 1879 I was a[»pointed to the Munro Professorship of Physics in this College. My work, as the incumbent of this chair, has includorl both elementary and advanced courses of lectures in almost all departments of both Mathematical and Experimental Physics. I have also introduced Practical Laboratory instruction, first into the Honours Course, and lately into the ordinary B. A. and B. Sc. Courses. I have also conducted classes for training students, intending to become teachers, in illustrative exi)erimentation. 1^'or the present organisation of my classes, I beg to refer you to the Calendar of the College, copies of whicli I send herewith. For some years I have performed the duties of Secretary and Registrar of the Faculty of Arts, and have been entrusted by the Senate with the editing of the Calendar. During my residence in Halifax I have endeavoured to do what I could in promoting educational reforms and in assisting: in the mjmafrement of Educational and Scientific Institutions. Both at Clifton and at this Collesfe I have been ham- pered in original research by lack of instruments of precision. I have, however, done what I could with the ajjparatus at my disposal; and during my vacations I have, on several occasions, through the kindness of Professor Tait, been able to make use of the rich stores of the Natural PliilosQphy Lalioratory of the University of Edinburgh. I have been aided also by a grant from the Government Grant Committ*;e of the Royal Society of London, made to enable me to complete a research which is at present in progress. A list of the more important of the scientific papers which I liave published, is appended to this letter. I send copies of them herewith in cases in which I still liave copies on hand. I have published one book : " An Elementary Treatise on Kinematics and Dynamics," a copy of which I send herewith. I beg to submit for your perusal extracts from such reviews of this book as have reached me. I am a Fellow of the Royal Society of Edinl>urgh, a Member of the Physical Societv of London, a Fellow of the - *^ • . Royal Society of Canada, and President of the Nova Scotian Institute of Science. I have the hon«)ur to submit for your C(jnsideration, testimonials from some of tiie distinguished Professors under whom 1 studied in Edinburgh and Leipzig, from the Heads of Colleges in which I have been a teacher, from former and present coUengues, teaching .subjects closely related to Physics, from felloAV -students who have distin- guished themselves in the department of Physics, and from other persons whose opinion seemed to me of value, and with whom I am either jjersonally acquainted or have become acquainted by correspondence. • I have the honour to be, Gentlemen, Your obedient servant, J. G. NlACGREGOR Dalhousie College, ) Halifax, N. S., May jot h^ iSgo. j Ill LIST OF PRINCIPAL PUBLICATIONS. SCIENTIFIC PAPERS. On the Electrical Conductivity of certain Saline Solutions. (In conjunction with J. A. Ewing.) — Trans. Roy. Soc. Edin., 1873. (See also Wiedemann's Die Lehre von der Elsktricitat I., 5H9 ; Mascart and Joubert's L'Elec- tricite et le Ma^dtisme, IL, 848; Encyclopaedia Brit- tannica, Art. Electricity, p. 50; F. Jenkin's Electricity and Magnetism, p. 2G0 ; Everett's Units and Physical Constants, p. 161 ; Hospitalier's Formulaire Pratique de I'Electricien.) • Note on the above. — Proc. Roy. Soc. Edin., 1874-75. On the Electrical Conductivity of Stretched Silver Wires. — Proc. Roy. Soc. Edin., 1875-76. (See also Wiedemann's Beiblatter, Vol. I; Fortschritte der Physik, 1876; Silliman's Journal, Ser. 3, vol. XI.; Xaturforscher, 1876 ; Wiedemann's Die Lehre von der Elektricitat, I, 521. On the Electrical Conductivity of Nickel. (In conjunction with C M. Smith.)— Proc. Roy. Soc. Edin., 1875-76. On the Thermoelectric Properties of Cobalt. (In conjunc- tion v/ith C. G. Knott and C. M. Smith.) — Proc. Roy. Soc. Edin., 1876-77. (See also Wiedemann's Bei])latter, Vol. II.; Fortschritte der Physik, 1878; Wiedemann's Die Lehre von der Elektricitat, II., 301.) Notes on the Volumes of Solutions. (In conjunction with J. A. Ewing.) — Reports Brit. Asso., 1877. (See also • Nature, 1877 ; Fortschritte der Physik, 1877.) On the Thermoelectric Properties of Charcoal and of certain Alloys, with a Supplementary Thermoelectric Diagram. (In conjunction with C. G. Knott.) — Trans. Roy. Soc. Edin., 1878. (See also Wiedemann's Bei- blatter, V^ol. Ill; Fortschritte der Physik, 1878 and 1879 ; Wiedemann's Die Lehre von der Elektricitat, IL, 301.) fi On the Variation M'ith Temperature of the Electrical Resistance of Wires of Certain Alloys. (In conjunction with C. a. Knott.)— Trans. Roy. Soc. Edin., 18«0. ' (See also Wiedeuiann'.s Beibliitter, Vol. VI. ; Fort- schrJtte der Phj^sik, I8S1 : Wiedemann's Die Lehre von der Elektricitiit, I., 516.) On the Absorption of low Radiant Heat by Gaseous Bodies. — Proc. Roy. Soc. Edin., 1882-83. (See also Wiede- mann's Beiblatter, Vol. VIII.) 4 On the Measurement of the Resistance of Electrolytes by means of Wheatstone's Bridge. — Trans. Roy. Soc. Can,, 18S2. (Set also Wiedemann's Beil>latter, Vol. VIII.; Fortschritte der Physik, 1882 : W^iedemann's Die Lehre von der Elektricitat, IV., 657.) On Experiments showing the Electromotive Force of Polarisation to be indopendenfe of the Difference of Potential of the Electrodes. — Trans. Roy. Soc. Canada, 1883. (See also Wiedemann's Beiblatter, Vol. VIII.; Fortschritte der Physik, 1883: Wiedemann's Die Lehre von der Elektricitat, IV., 1290.) On th(3 Resistance to tlie passage of the Electric Current l)etween Amalgamatei y I natm :^3n 12 -• II. i1 -U From D. H. Marshall, M. A., F. R. S. E., Professor of Physics, Qtteetis University^ Kingston, Ont., Author of '" Introduction to the Study of Dynamics" etc., Formerly Assistant in the Natural Philosophy Laboratory pf the University of Edinhura^h. Prut'ossor J. G. MacGiv<^or iiifoiins iiif that he is a candidate for the Chair of Expt.'rinier well tiie enthusiastic worker in the nja'niificrnt Physical Laboratory of Edinl)Ui'gh [Tniversity where for three yeai's Prof. Mac(}re<;oi" \vork"'d .so successfidlv under the leader- ship of Prol. Tait, than whom perhaps he could not have had a better leader in tin- whole ranije of Physics. Prof. MacGrecror's eminence secured for him, soon after gradua- tioi his present position and tlio Fellowships of the Royal Societies of Edinburgh and Canada. The papers he has contributed to these Societies and his recently published work on Kinematics and Dynamics are sufficient eviilence of liis perfect mastery over the subjects he desires to teach in McGill College. Prof. MacGrecjor's great enthusiasm in teaching his favourite subjects and his bright and honourable character make me feel that the patrons of tlie Cliair will lind it difficult to get a better candir has boeii known to ino fur Hoveral year.s as a zealous and enthusiaHtic .student of science. He has devoted his attention specially to Physical Science, and ha.s acted as assistantf to Professor Tait in the Physical Laboratory of the University of Fidinburgh. He has submitted uuiny important communications to the Royal Society of Edinbur|.,di. I liave great pleasure in recommending him as being well qualified for the appointment of Professor of Experi- mental Physics in the New University College, Bristol. J. H. BALFOUR, M. D., F. R. S., Sec. R. S. E., ProJfSHor uf MtdiciivR and Botany in the Uniwrsity of Edinburgh. KOTAL BOTAXIC GARDEN', EdINIIUROH, Junr. 20th, 1876. ■\ i I •! 16 V. Ftom Archibald Gkikie, LL. D., F.R.SS. L. &E.,F.G.S., Dinctor- General of the Geological Survey of the United Kinji^dont, for- merly Murchison Professor of Geoloi^y and, M ineralogy in the University of Kdinduri^h. ((.IVEN ON A FORMER OCCASION.) Mr. J. G. MaeGre<;;or atteinled the cliiss of Geolo^'-y an(J Mineralogy in tliia University, and showi'd great promise as a stuilent. I had ()j>i)ortunities of judf^nng of his ]»()Wt'rs of observation, which seemed to me to be such as to nmrk him out as one who would d<» good service as an orii^inal worker in science, and to fit him in no common d<'gre(! for the task of expounding scientific progress to others. I believe him to be well (jualified for the post to which he aspires. AR(;H. (JEIKIK, LL. D., F'. R. .S., Uurchinon F'rofesnor of Geology and Mineralogy in the Uniftrxity of Edin- burgh, and Director of II. M. Geological Survey of Scotland, Edinbdroh, June £Snd, 1S7C. .n I!! i 16 VI. From the R!£V. Henry Calderwoop, LL. D., Professor of Moral Philosophy in the University of Edinburgh. Professor J. G. MacGre^or, Dalhousie C<7w /"/^^f Rev. Canon John Percival, M. A., LL. D., //eaa Afaster of Rugby School, formerly Head Master of Clifton College, Bristol, and President of Trinity College, Oxford. As I understand that Professor Ma,cGregor is a candi- date for the Professorship of Experimental Physics at McGill College, Montreal, I desire to give my testimony in his favour. He was the Chief Master of the Physical Department in Clifton College for some time during my Head Mastership, and he filled the post admirably. Both as an exponent and as an experimenter, I look upon him as one of the hest teachers of Physics I have ever known, and his al)ility and attainments are sufficiently guaranteed by his London University Degree. I desire also to add, as of no slight importance, that he is a very pleasant man, anil wins the respect and affection of both colleagues and pupils. McGill College will be very fortunate if it secures Dr. MacGregor's services. J. PERCIVAL, Htad Ma!>trr of Rwjby. Athenaeum Club, Pall Mall, April 30th, 1890. 11 24 XI. From the Rev. J. M. Wilson, M. A., F. G. S., Head Master oj Clifton College^ liristol, England^ late Fellow of St. fohris College, Cambridge, Author of " Solid Geometry and Conic Sections" etc. To THE Council of the McGill College, Montreal: Gentlemen, — My friend, Dr. MacGref^or, tells me that he is a candi- date for the Profes.sor.ship of Experimental Physics in your College. Perhaps I may be allowed to bear my testimony to the quite excellent work he did as a Master at Clifton College. He impressed us all as a master in his own subject, as a most inspiring and attractive teacher of Vjoj's of all ages from 14 to 19, as a man of wide interests and culture, and as a most delightful colleague. He is known as a man of first-rate ability by the work he has done. May I add that 1 speak to some extent as an expert, for I was myself Science Master at Rugby for many years before coming to ('lifton College as Head Master, and I was therefore well able to appreciate his work. If you select him, you are sure of an experienced, successful and attractive teacher, and of a very great addition to your Professorial Staff. Yours very faithfulljc, JAMES M. WILSON, Late Fellow of St. Jokn'.H Coll. , Camhridgi', and Head Af outer of Clifton College. Clifton College, Clifton, Bristol, April 28th, 1890. 25 XII. From WllJ.iAM A. Tilden, D. Sc. Lond., F. R. S., F. C. S., Pro- fessor of Chemistry in Mason College, Birmingham, F.xaminer in Chemistry to the Universities of London and Cambridge, formerly Chief Lecturer on Chemistry, Clifton College, Author of '"'■ An Inttodiiction to Chemical Philosophy" etc. My friund, Pn^t'cssor J. G. MacOregor, tells me he is aliout to become a eaiKJidate for the Chair of Ex])ei"imental Physics in McGili Colle^'e. My acquaintance with liim, exteniling over very many years, entitles me to say that [ thiiik him eminently qmilitied to fill the post with dis- tinguished success. Dr. MacCJregor and 1 worked together at (,^lifton for several years, and, my department being Chemistry and his Experimental Physics, I had full opportunity of observing his methods of teaching and examining, and his control over his classes. I am not o\erstating the case when I .say that no more brilliant teacher, no more judicious examiner, ever entered Clifton College, nor one who.se departui'e was more regretted by colleagues ami pupils alike. Dr. MacOregor, since his residence in Canada, has l)oen active in the pur.suit of investigation in connectitm with liis subject, and has published a nundier of al)le and important papers ; so that in every respect, as practised teacher and as investigator of established fame, he possesses complete qualifications for the post he is .set^king ; and I know no one whom I could .so strongly rec<:)mmend for the Professorship in McGill College. WILLIAM A. TILDEN, D.,Sc. Lond., F. R. S., v ProffMor of Chemishy in Mcuon College, and Examiner in Chemistry to the Universities of London and Cambridge. "The Mason Science College, Birmingham, • . " £8th April, 1890. '! II 'T ; I : I I, I xiri. From J. E. A. Stf.GOall, M. A., late Scholar of Trinity College, Onnbritli^e. Professor of Mtithematics txml Natural Philosophy in University College, Dundee, formerly Mathematical and Physical Master at Clifton College. My tViond, Dr. J, G. Mju'(ir('<,'or, tcHs iik^ he is a cniidi- flute for the Prof«'SSorsIiip of l']x|»oriiiiont.al Physics in the McGill Coiiej^'e, jMontnal. CritU'r him I woriscd as a colleat^'uo in the Piiysical Dupartnient of Clifton College, ten or eleven years a^'o. At that time there was little or no physical work clone in mf)st Encjlish schools, hut Dr. MacGi'e^'or had already laid the foundation of the excellent physical course wliich is now develoi)ed at Clifton Collef];© and elsewhere. With the most scanty resources and in the most limited space, Professor MacGref^or manarjed to awaken the interest and enthusiasm of his students and to carry them on with the best results. SincH then he has published several important phj'^siciil works, notably his accvu'ate and scientific exposition of dynamical principles, and the careful collation of pliysical results and constants set forth in his papers on heat and on solutions. But besides all these qualifications as a teacher and as a physicist, Di". MacGre^'or possesses others of equal value in the occui»ant of the post he seeks. To his clearness of thought he adds a liberality of opinion and a breadth of culture that are so marked as to be unusual ; and by his colleagues, pupils and friends, he is always remembered in England and Scotland as one of those men of simple life, of absolute? honour and of sympathetic thoughtfulness, that would create and preserve the best precedents and traditions of a Professorial Chair. 4 Park Place, Dundee, J. E. A. STEGGALL, May Sd, 1890. t7 XIV. n r'totn H. S. Hail, M. A., fcrmerly Scholar of Christ's College, . Cambyid}it\ Senior Master of the Military and Enf^ineering Side of Clifton College, Joint Author of Hall and Knight's " Higher Algebra^' etc. To THE Board of Goveunohs of Mc(Jill College, Montreal. Gfiiflfuirn : My friend and former colleaf^ue, Di*. J. (J. MacGre^or, has asked nie to assist his candidature for the Professorship of Experiinentnl Physics in McGill College, Montreal, and I have niuoii pleasure in doing so. Of his scientific attainments and the work he has recently df)ne, 1 feel it is superHuous for me to speak ; on these points you will have abundant testimony from others. Though it is ten years since Dr. MacGregor left Clifton College, his work and influence are not forgotten. During the last few years tlie intei'est in scientific work has largely increased and the facilities for experimental work have been greatly improved and developed. Dr. MacGregor's old colleagues well remember how much he did to encourage and stimulate science teaching at a critical time in the school's history, and how readily he adapted himself to the growing needs of the school in his dej)artment. In fact I may say, witiiout hesitation, that during the seventeen years I have been connected with Clifton College, 1 have known no Master appointed to an important post who has more quickly and successfully grasped the diflficulties of our complicated system and so readily gained the confidence of his colleagues and pupils. As the Senior Master in Physical Science, Dr. MacGregor, in the short space of two years, succeeded in ■■ I ; 28 giving a atiimilus to the work of his eedily feel entire confich^nce in his justice, good temper and good Bense. I have the honour to bo, Gentlemen, Your obeilient servant, H. H. HALL. M, A., Foitnf.rly Scholar of ChrUVs Colley)', Catnhr'ulg*, Senior Master of ('«/ the Hon. Sik Adams d. Archibald, K. C. M. G., P. C, 1). C. I,., Q. C, M. P., Chairman of the Hoard of Gm>erttors oj Jht/housie I 'niversity. 1 loarn from I )i-. .1. (J. Mac(ir»'<((>r, of Dalliousio Uni- versity, llalifux, that Ik; is a candidate* for the recently estahlishtd ('h.iir of lixpt'i'iinental IMiysies at Mc'(«ill Colle^M', .\h»ntn'al. Th«' (lONernors of Dalliousie would regret exceodin^dy to lose the sei'vices of Dr. MactJre^^or, who has disehar^cd his duties at Halifax to their entire satisfaction ; hut they feel it \V(Uild he unjufit to that ^n-ntflenian to allow th(>ir hi^di estinnite of his aliility and (jualifications to stand in the way of his promotion to a bettei* position elsewhere. I conside)- J)]-. MaeCJre^for admiralty (|ualiiied for the Ciiair in question. Hu has estid)lished for himself a high position in a kindred Chair in ].)al]iousie. He is a man of great energy, antl possesses in a marked degiee the faculty of imjtarting information to the students attending his classes. A .scholar and a gentleman, he will fill creditably any position that may he given him. ADAMS Ci. AKCniliALD, Chairman of Board of Governors of DaLhonnii'. House of Co.MMoNsi, Ottawa, May loth, Jt<90. i 30 XVL From the Rev. John Forrest, D. D., F. S. Sc. L., President of Dalhousie College and University, Halifax, N. S. I have known Professor J. G. MacGregor f i-om boyhood. During 1865 and 1866 I had charge of a school in Halifax of which he was a pupil. He M^as always dilioent an^ successful in his'studies, maintaining a first place among a number of very clever boys. In 1866 he entered Dalhousie College as a Student in Arts, aud during the whole of his course, maintained an exceptionally hi^h standing, winning First Class distinction in all his classes and first prizes in a large number of subjects, including JNlatheniutics, Chem- istry, and Mathem vtical and Experimental Physics. In 1871 he won a Gilchrist Scho^xrship, and pursued his studies in Edinburgh and Leipzig. His certificates will shew the work he accomplished at these Univei'sities. In 1876 he was appointed Lectui-er in N^atural Philosophy in this University. He held the position for only one year, but gave such entire satisfaction, that when the Munro Professorship of Physics was founded in 1880, he was at once selected to fill the Cliair. From th'it time he has discharged the duties of the Professorship with faith- fulness and marked success. The work has been greatly extended, the Physical part of the Honours Course in Mathematics and Mathematical Physics verj^ much increased, and an Honours Course in Experimental Physics and Chemistry instituted. Dr. MacGregor is a very effective lecturer an'. . : ' My friend, Dr. J. Gordon MacGregor, having asked me for a testimonial in his favour, with a view to the Chair in Physics for which he is now a candi^late, I beg to submit the following : — .' In his undergraduate course at this College, he was l)y far the most distinguished student of his year. Accordingly at the Sessional Examinations he stood first in nearly alb if not all, his classes, not only in the subjects of Mathematics and Science, Physical and Metaphysical, Init also in the departments of Classics. The Gilclirist Scholarship, which of course he easily won, enabled him to continue to advan- tage his studies abi'oad, which he did, hencefortli converging his attention specially on Phy.sics. His M, A. Thesis presented to us in due course on an interesting problem in Electi-icity secured for him, when published, a place of* some authorit}' among scientific investigators. In this College, first as Lecturer and then as Professor, — after he liad obtained his Degree of D. Sc. from the London University, — he was with his students popular as a friend, and effective as an Instructor. \ He and I have been, now for many years, associated in carrying on an Advanced or Honours Course in Mathe- matics and Pliysics, open to students wdio have already made sufRcient progress, in the second half of tlie under- gi'aduate curriculum. I have thus been associated with Dr. MacGregor more closely than with my other colleagues. For him as a coadjutor and counsellor, I have words of only the highest praise. His Examination Papei'S in his department are at least as searching and testing as mine in my own, His published volume on Dynamics, — a work il tliat has b'.;en made a text-book in other Colh'ijjcs as in ours, — indicates his methods and treatment of Physical subjects better and more shortly than anything I can say. There is one thing of first importance in a Professor, which I may venture to add. I have heard Dr. MacOrcgor on several occasions lecture on some branch or sub-branch of Physical Science ; and as a Lecturer I think him very far indeed above the ordinary scientific man. His style deserves the epithets of vivacious, fluent, clear, accurate, without parentheses and interjected explanations and corrections, vices of expression that so often cling to the stylo of able and accomplished men of Science, but poor lecturers, and do so much to interfere with tlie just enlif{htenment of the listener. His friends must join him in the wish that he may succeed in his present candidature ; but should he do so, to Dalhousie College the loss will be very great. For outside his preceptorial duties. Dr. MacGregor's wise counsel, pleasant manners, puiictual business habits, and unlimited capacity and willingness for work, constitute him not only a useful but, — I might almost say, — all but indispensable member of our Faculty. CHARLUS MACDONALD, M. A., Prof. Math. Dalhousie ColIaEoe, Halifax, , May 16lh, 1890. m he- Idy IV- Ith n ■ P sli w 34 ' * * XVIII. Fro/n George Lawson, Ph. D., LL. D. (McGill), F. R. S. C, McLeod Professor of Chemistry in Dalhousic University^ Halifax^ N. S. \ It affords me much pleasure to express my opinion of the fitness of my friend and present colleague, Dr. J. Gordon MacGregor, for the new Chair of Physics in McGill College, having had the fullest personal opportunity of judging of his qualitications. While an undergraduate at Dalhousie College he was one of our ablest and most active students, and distinguished himself in a signal manner by the facility vv^ith which he gained the highest Class and XJnivevsity distinctions. His subsequent career has been no less marked throughout, not only by ability, l)ut also by constant activity and assise(][uent years of t yperience have only tended to strengthen. As Professor MacGregor 's colleague, teaching ii cognate subject (Chemistry), and enjoying daily inter- course with him during our College Sessions, I have the best means of knowing him to be most indefatigable in the teaching of his classes, sparing no labour to interest and advance his students, and to give them liigh aims in tlieir studies. He expounds his suVject with a clearness that caimot be excelled, and enforces, l)y precept and example, the necessity of aiming at the nearest possible approach to precision in all experimental work. 85 Not only in his own department, but in the general work and bnniness of the College, Dr. MacGregor has taken an active part, and the prompt and efficient way in which he has discharged the duties of Secretary of the Faculty of Arts, lias qften lessened the labour and anxiety of his colleagues. His extensiv^e acquaintance with the sys- tems of other Universities has enabled him to suggest as worthy (if adoption several of the improvements that have been introduced into our curriculum during the )ast few years, among which may be mentioned the Special Science Course, leading to Degree of B. Sc, in wliich Mathematics, Physics, Chemistry and Modern Languages |)redominate. It was also on Ur. MacGregor's suggestion that a Special Honours Course was instituted in Expoimental Physics and Chemistry, requiring from students laboratory work in both departments. This Honours Course has been carried out with gratifying success. It is but proper to add that Dr. MacGregor has prac- tically, and in the fullest manner, recognised that the extent of a Professor's duties is not limited bv the College walls. He has aided in many ways the scientific, literary, artistic and educational organizations of the City and Province, and has been ever ready to take his part in diffusing throughout the conmuinity a taste for, and knowledge of, the truths and methods of Science. Pie has delivered special lectures to Teaehc -;, and given numerous public lectures and demonstrations throughout the Maritime Provinces, that have been highly appreciated. As Presi- dent of the Nova Scotian Institute of Science, he has increased the efficiency of that institution to an extent previously unknown, having by his personal exertions, succeeded in bringing it into active correspondence with many of the leading scientific societies tlu'oughout the world. For the reasons stated and others that might be adduced, I can, with the fullest' confidence, recommend Dr. J. Gordon MacGregor to the attention of the Board of m m Governors of McGill University, as a Professor eminently qualifi(;d for the important antl responsible post, wlvich they are now called upon to fill. While deeply sensiV)le that his removal from Dalhousie would be a sei'ious loss to our institution and a personal disadvantage to myself, the regret would be lessened by the feeling that he had secure'. .S., teth iu . 99P. i ■ n 37 XIX. From David Allison, M. A., LL. D., Superintendent of Education for the Province of Nova Scotia. For the past twelve years I have had some opportunities of estimating the character of the work done by Dr. J. Gordon MaeGregor, in liis Ci;pacity as Professor in Dal- housie College, while I have been able to note, probably as accurately as any one else, his impress on our educational affairs generally. It is my conviction that his withdrawal from his present post would be a very serious loss, not only to his own University, but to the cause of Provincial Edu- cation, in which he has always taken a very deep and intelligent interest. The In.stitution and the comnmnity with which Dr. j\IacGregor may be connected, are sure of havinfj at command not onlv scientific erudition of a high order, hut a most active and hel]>ful sympathy with all forms and phases of educati(mal progress. In the import- ant fields of industrial and art education he has performed for the Province much invaluable pioneer work. Leaving it to others who possess special right to speak, to testify of Di-. MacGregor's scholarship and " aptness to teach," I content myself with expressing the confident belief that they are more than adequate for any position to which he may aspire. DAVID ALLISON, Supfrintendenl of Education. Educatiox Office, Halifax, N. S., May 27th, 1890. ! I''. "8w XX. From Alexander McKay, Supervisor of Schools for the City of Halifax and Secretary of the Nova Scotian Institute of Science. For some years I liave been closely associated with Dr. MacGregor in several kinds of work, and have liad excep- tional opportunities of forming a judgment of him both as a Professor and in other capacities. Some of the most successful of the students wlio have passed through his classes were at one time pupils of my own ; and I know from them that his teaching has been most acceptable both to themselves and to all associated with them in the same studies. At my request as Supervisor of Schools, he gave a course of lectures to the teachers of the City. The attend- ance was large, and the unanimous opinion of lus critical audience was the same as my own, that he is a clear and accurate reasoner, who is never carried away by theory, that his lectures are given in as popular a style as his subject will admit of, without loss of scientific accuracy, and that his met! ods of teaching embrace the most modern improvements. As the President of the Institute of Science, he has shewn extraordinary business capacity, — an energy and method that allowed not even the minutest details to be forgotten. In fact, the present flourishing state of our Institute is due entirely to him. I have been associated with Professor MacGregor also in the directing of the affairs of the " Victoria School of Art and Design ", and of the " Halifax Ladies' College," for the last thi-ee years, and can testify to the readiness with 80 which h(. has ^iven time and energy to the development of their uselukiess, and his vahie as a Director. It is with rerrrot that I learn that ho int(mds to apply for a Professorship elsewhere, as I lioped that my own son would, next year and until he ^n-aduated, have the pood fortune to he tai^dit by him. But I feel that l)r A acOrecror is de-serving of a hi^rl.er position and capable ot hJlmcr ,t with credit to hiinself,satifacti(m to his employers and advantage to the community in which he may live. ■ ■ A, McKay, Sec. X. S. I. S., Supervisor of Halifax Schools, Office of School Co>fMissioNERs, Halifax, N. S., 19th May, 1S90. ' ■ 4a XXI. From the late Rf:v. PKor. I'uii.ii' Kelland, M. A., F. R. S., V.-P^ R. S. E., Professor of Mathematics in the University of Edinburgh, Author of " fhi Theory of Heat," etc. (giv5:n on a former occasion.) As one of tlie Vice-Presidents of the Royal Society of E(liMl)in-f,di, I have liad several opportunities of noticing Mr. MacGregor as one of the yf)ungt-'r workers in the advance of the Physical Sciences. Mr. MacGregor has appeared among.st us on several occasions as the contributor of an original investigation. In particular, there is printed in our Transactions a paper by him, in conjunction with Mr. Ewing, " On the Condilt.'tivity of certain Saline Solutions," which is in itself a sufficient testimonial to Mr. MacGregor's standing as a Phy.sicist. His other papers, " On the Electrical Conductivity of Sti'ctched Silver Wires," and " On the Electric Conductivity of Nickel," add to his claims, and promise to be the harbingers of a distinguished career. I may add that Mr. MacGregor's personal appear- ance and address are greatly in his favour, and I confidently recommend him for the Lectureship on Experimental Physics for which he is a candidate. PHILIP KELLAND, F. R. S., V.-P. R. S. E. 20 Clarendon Crescent, Edinburou, June SOth, 1876. \\ 41 XXII. From G. Chrystai., M. A., LL. I)., \'.-l». R. S. E., late Fellow and Licftnrr of Corpus Christi College, Cambridge, Professor of Mathematics in the University of Edinburgh, Author of the Articles Electricity and Magnetism in the Encyclopicdia Britan- nica, " Text Book of Algebra,'^ etc. It gives me fty^^xi plensnrf to say a word in favour of Mr. J. G. MacGr<'<(or, wlio is, I am glat be waste anslator and Editor of DeschanePs '■'•Natural Philosophy^'' Author of " Vibra- tory Motion and Sound" etc. I am familiar with the name of Professor MacGregor of Halifax as a man of energy and ability. Before he Avent to Nova Scotia he had performed in conjunction with Professor Ewing, some valuable experi- mental work in the measurement of electrical resistance, the results of which I have embodied in my " Units and Physical Constants." He has since published a well known book on Dynamics, which is characterised by clearness of language and exhildts intimate acquaintance with modern methods of treatment. I regard Professor MacGregor as an eminently suitable candidate for the Chair of Experimental Physics in McGill College. J. D. EVERETT, F. R. S., Profes>ior of Xatural Philowphy in Queen's College, Belfast, Belfast, May 5th, 1S90 51 XXIX. )le »ill From Andrew Gray, M. A., F. R. S. E., Professor of Physics in the University College of North Wales, Author of '■'■ Absolute Measurements in Electricity and Magnetism" etc. I have much pleasure in supporting the candidature of Prof. J. G. MacGregor, D. Sc, for tiie Ciiair of Experimental Physics in the McGill College, Montreal, ilis puljlished papers and especially his Treatise on Kinematics and Dynamics shew that he is a man of great mental activity and intellectual grasp. His knowledge of physical science seems to me to be firmly grounded on the only sure found- ation, a tiiorough appreciation of the fundamental principles of Dynamics, and familiarity with the subject matter and mathematical processes of that science. The Ixjok 1 have mentioned seems to me excellent in all respects. It is clear, elegant and ctjncise, and accomplishes well the very difficult task of lucidly placing before the learner, with carefully selected illustrative examples, elementary dyna- mical laws and principles with their most important developments. My colleague, Pi-of. G. B. Matthews* (Pro- fessor of Mathematics) informs me that he has recommended this book for i)articular students and has also formed a high opinion of its merits. I have had the pleasure of meeting Prof. MacGregor personally, and though I have not heard him speak in public, I should judge from his ordinary mode of expressing himself that he would be a clear and able lecturer. ANDREW GRAY, M. A., Professor of Physics in the University College of North Waka. Univeesitv Collkgk of North Wales, Bamjor, May 6th, 1890. "Senior Wrangler of 1883— J. G. M. , ■ ■■,. ■'':;■■■' ■ ■'■■ .- T^ 7 1 \ 1 ■ I Hi l\ 52 XXX. FroM E. A. Letts, D. Sc., Ph. D., F. R. S. E., F. C. S., etc., Professor of Chemistry in Queeris College^ Belfast. I have great pleasure in expressing my sense of Prof. J. G. MacGregor's high qualifications for the recently founded Chair of Experimental Physics in the McGill College, Montreal. It has been my good fortune to have known him since he was a student, and I can bear testimony to his great abilities, to his love of his subject, to his ca^^acity as a teacher, and in especial to his skill as an experimenter and original observer. In one way I regret that he is applying for the Montreal Chair, as I had always hoped he would gravitate to a high Professorial appointment in the mother country. E. A. LETTS, Z). Sc, Ph. Z>., F. R. S. I'J., F. a. S. 4tc., Queen's College, Belfast, May 5th, 1890. Professor of Chemistry. i * 6$ XXXI. From A. M. Worthington, M. A., F. R. A. S., Professor of Physics and Head Master of the Royal Naval Engineers' College, Devonport, formerly Senior Master in Physics, Clifton ■ College. My dear MacGregor: Royal Naval Engineeiis' College, Devonpobt, May 5th, 1890. I have just received your letter saying that you intend to become a candidate for the Chair of Physics at the McGill College at Montreal, and asking for a word of support in your application. This I can give most heartily and I think with a pretty good knowledge of your work ; for I know exactly the lasting mark you made at Clifton College by your vigorous teaching ; I have read all or very nearly all of the Physical papers you have written since you were in Halifax, and which no one who wishes to keep hin;self well informed can afford to neglect ; and lastly I have made much use in my teaching of your book on Dynamics, in respect of which I am very glad to have this o|)portunity of expressing my gratitude. It excels in clearness and is conspicuous for the unflagging care shown on every page from first to last. It is a book on a subject most difficult to handle, that none but a most accomplished and experienced teacher could possibly have written. I understand that the Physical Laboratory at Montreal will be a good one. If it falls to you to direct, as I hope it may, it will be in good hands, and the electors may feel r^ 54 i I :; i; il\ confident that researches of the highest standard will be vigorously pushed forward there. I really do not think that any one of the younger generation of teachers could be named in this country as likely to do V^etter work than yourself. Believe me, Yours very truly, A. M. WORTHIXGTON, M. A., F. R, A. S., ProffSHor of Pki/nicx and tifiul t',fi:»fi>r of thf lioyid Naval hJnf/iiiecrit' ColUijt, Dfvonport, Professor J. G. MacOregor, 55 ' » XXXIT. From W. L Goodwin, D. Sr. (Edin.), B. Sc. (Lond.), Professor of Chemistry in the Queen's University^ k'inf^sfon, Ont., Author of " A Text Book of Chemistry," etc. Professor J. G. MacGre^or has lieoii known to me since 1877. His career both as a stuflcnt and as a teacher of Science has been eminently successful ; and he lias added to his attainments in Science that broad culture, without which a University teacher is at a decided disarl vantage. In every thin|:f which he has undertakon Dr. MacGregor has shown the clearness of thoun^ht, keenness of mental vision and regulated enthusiasm which are so essential to success in both investigation and teaching. Dr. MacCiregor has the reputation of an exceptionally good lecturer ; and he hns done much to excite an interest in Science in Nova Scotia. His kindly disposition and his knowledge of affairs combine to give to Dr. MacGregor peculiar fitness for a seat in a University Senate. Dr. MacGregor has done valuable work in his chosen department of Science, — work which has been recognized in the leading physical publications of the world ; and I be- lieve him to be possessed of the manipulative skill and the scientific imagination which enable their possessor to do the highest kind of work in experimental science. I have no hesitation in recommending Dr. MacGregor to be appointed to the chair of Physics about to be founded in McGill University. W. L. GOODWIN, , , ^ D. Sc. (Eflin.), B. Sc. Lond.), Professor of Chemistry. Queen's University, Kingston, Ont., May 14th, 1880. 56 ii XXXITI. From John Trowbridof,, S. U., Professor of Physics^ Harvard University, Cambridife^ Mass., Corresponding Member of the British Association, etc. My Dear Professor MacGkeook: I sincerely trust that yow may obtain tlic cliaii- of Ex- perimental Physics in McCjliil University. 1 have always read your pa|)ers with jtp-(;at interest; and I feel sui-e that you would Vmild up the department of Experimental Physics, and would ctnitrihute to the scientitic reputation of the University at Montreal. I have no objection to your showing this note, if in your (»pinion, it will furtlier your claims to be considered a candidate for tiie position. Verj' truly yours, JOHN TR0WBRIDf4E. CAMnuinoE, May 6th, 1S90. 57 XXXIV. From ICinvm H. Hai.l, Ph. D., Assistant Professor of Physics in Haniard UniTrrsity^ Cambridi^c^ Mass., formerly Fellow of Johns Hopkins University, Baltimore^ Correspondinq; Member of the British Association, Author of " Elementary Ideas, Definitions and Laws in Dynamics" etc. To THE Governors of McGill University. Gentlemen : Pi'of. Macdlre^or, of Dalhousie Collcfje, HalifnJc, has informed me that he is a candichite for the Cliair of Experimental Physics in Me(jill CoUefje, and has aske(l me to maivi; known to you my opinion of his (jualifications for th<.' phiee. Having for a nnmlter of years heen somewhat acquainted with Prof. Mac(j}regor and witli his writing's, I take pleasure in sayinfjf that I consider him a well-trained, intellif^ent and f<)rciV)le man, a(hniral)ly fitted for the work of the position for which he is a candidate. I am able to add that B. O. Peirce,* Professor of Mathe- matical Physics in Harvard Collefje, lias lately examined Prof. MacGrei^'or's bo<)k on Dynamics and has formed a favorable impression of the author. Respectfully yours, EDWIN H. HALL, Anst. Prof, of Phyaicn in Harvard College, Harvard College, Cambriucjk, U. S., May 15th, 1S90. * Author of " Theorj- of the Newtonian Potential Function," etc. 58 m I '■ XXXV. • ' From Edward L. Nichols, B. S., Ph. D., Professor of Physicsy. Cornell University^ Ithaca^ N. Y. I have known Professor J. G. MacGregor for some twelve 3^ears, When I made his acquaintance he was regarded in Edinburgh and at the German Universities as a young Physicist of uncommon promise ; since which time my admiration of his powers as an investigator has be^n increased by reading one valuable contribution to Experi- mental Physics after another from his pen. Of his success as a teacher I have heard many most favorable opinions from those who have been his colleagues at Dalhousie College, and from students who after having' been pupils of his, have chanced to come under my own instruction. . It gives me gi-eat pleasure to state that I know of na man in America whom I deem better qualified to hold an important position in Physics than is Dr. MacGregor. EDW. L. NICHOLS, Professor of Physics in Cornell University^ Ithaca, N. V., May 7th, 1S90. n^' 59 XXXVI. From T C. Mendenhall, Superiniendeni of the U S Cn..f ^ Geodetic Survey, Washinirton n r r , ^'^ "'"^ Physics in theOhhtt^Jn'- ' ^''''^^^^Z Professor of J' ine Ufno State Umverstty, Columbus, Ohio. m.oVfL^'^'T'' "' '^^^^"^ ^^^^* '^^ familiarity with much of the work of Professor MacGregor of MhoTs e CoHege has given me a high opinion of\is ability as. Physicist. I regard liin. as clear in his perception of fL mental principles and skilled in experS^^.^^ ^^^^^^ •no doubt he would add strength to any Facu ty of Instruction with which he might be associated. ^ T. C. MENDENHALL, WashIxVgton, D. C. '^"^^" ^" *'■ ^''''^^ '''''^ ^'Odetic Survey, May 7th, 1S90. 60 XXXVIL From A. L. Kimball, A. B., Ph. D., Associate in Physics, and for- merly Fello7u, of Johns Hopkins Utiiversity, Baltimore, Author of " The Physical Properties of Gases" etc. Prof. J. G. MacGreoor, Dear Sir : I am glad to learn that you are a candidate for the Chair of Physics at McGill College, and hope you will secure the appointment ; for though we have never met personally, I have heard of you so often indirectly through your students that I feel we are not entire strangers. I can testify to the warm appreciation which your students express for you as a teacher, and from what I know of the excellence of your Ijook on "Kinematics and -Dynamics," I can well believe tliis to be the case. Yoiu' book I have known for some time and most favorably ; and from what I know through your scientific ])apers of the work which you have been able to do, with the limited facilities at your disposal, I believe you would put to good use the fuller opportunities for research afforded by the Laboratory at McGill College. It would therefore give me great pleasure to learn that so important a chair as that at McGill College is to be in such good hands, and I sincerely hope you may be ap- pointed to it. Very truly yours, ARTHUR L. KIMBALL. JoHxs Hopkins University, Baltimore, May Sdlh, 1800. 61 XXXVIII. through ha„;ta;, .t:;Tr'" '""" "'" °"'^- Q.- , *^ <> *^* "'•'' papers on physical «itl, 1, n on their subjects. I consider him to he nre emmently g,ftecl as a physicist, an.l especiallv asa , xpe" mental phys.cist. His papers are '.„o,leIs of JZ ie p™e,s,on and sc entific accuracy, while l>is text !« k' K neu,at,cs and Dynamics," for an elementary treatise i both uu,sterly and con.prehensi, e. There are h my rr:: r^r^i'.r "? ''"^"«^'' ^>- ''-"--ientiHcih. ments as he, to hll w,th honor that post which it is his ain, and my smcere wish, he may obtain. Orange, N. J., 4tli May, IS90. A. E. KliNNELLV, £tectriciaii. I 62 XXXIX. 3 1 From Carl Barus, Ph. D., Physical Laboratory, U. S. Geological Survey, Washington, D. C. Prof. J. G. MacGregor, M. A., &c., Halifax, N. ^. My dear Sir : It gave me much pleasure to learn that you are a can- didate for the chair of Experimental Physics of McGill College, and I believe the Institution would be fortunate in securing your services. I first heard of you some years ago through Professor Kohlrausch. In those of your papers which have come immediately under my attention, I appreciated the con- science, industry and wide physical reading which your work shows. Having perused your " Kinematics and Dynamics " with profit myself, I can cheerfully repeat the good opinions which readers better qualified to judge its immediate merits than I am, perhaps, have already pro- nounced in its favor. Dear Sir, I am, Sincerely Yours, CARL JiARUS. Washington, D. C, May 12th, 1800. k 63 XL. I'romC. A. Perkins, Ph. D., Associate in Physics in the Bryn Mau'r College, Bryn Mawr, Pa., formerly Assistant ana Fellow tn Physics in the Johns Hopkins University, Baltimore. Understanding that Prof. MacGregor, of Dalhou.sie l^oJlege, IS a candidate for the Chair of Physics in McGill College, I take occasion to express my opinion of his tliorough fitness for the position. Though not personally acquainted with Prof. MacGrogor his name has been for some time familiar to me as author of a valuable and decidedly successful book on Kinematics and his work in experimental Physics also assures ability and skill in tliat line. From what 1 know of his work, I do not hesitate to recommend him as thoroughly qualified for the Chair and a decided addition to the teaching staff of the College. CHAS. A. PERKINS, Awiodate in Phi/sic.% Bryn Mam- CoW'gf, DRYN Mawr, May S3rd, ISOO.