SCIENCE.— AD YER TISEMENTS. 



McQILL UNIVERSITY, MONTREAL. 



CHAIR OF CHEMISTRY. 



The Board of Governors is prepared to receive applica- 

 tions for the additional Chair of Chemistry newly instituted 

 by Mr. W C. McDonald. Candidates should produce evi- 

 dence of special qualifications in Organic Chemistry. Ap- 

 plications, accompanied by any testimonials which the 

 candidate may desire to submit, should be forwarded to the 

 undersigned on or before the 31st March next. 



W. VAUGHAN, Secretary, McGill University, Montreal. 



Dec. 1,1896. Just Published. Sixth Edition of 



THE MICROSCOPE ^SSlTe^^dT" 



By SIMON HENRY OAOE, Professor of Microscopy, His- 

 tology and Embryology in Cornell University and the 

 New York State Veterinary College, Ithaca, N. Y., U.S A. 

 Sixth edition, rewritten, greatly enlarged, and illustrated 

 by 165 figures in the text. Price, $1 .50, postpaid. 



COMSTOCK PUBLISHING CO., Ithaca, N. Y. 

 NEW CATALOGUE. 



We have recently issued a new edition, revised and en- 

 larged to 64 pages, of our catalogue of 



Books on Chemistry, Cbemical 

 Technology and Physics. 



It is arranged by subjects, and includes all the standard 

 books in Chemical and Physical Science, as well as the re- 

 cent literature up to date. 



A copy of this Catalogue will be sent free by mail to any 

 address. 



D. Van Nostrand Company, 



Publishers and Importers of Scientific Books, 

 23 Murray St. and 27 Warren St., New York. 



l^austioti 



Horsford's Acid Phosphate. 



Overworked men and women, the 

 nervous, weak and debilitated, will find 

 in the Acid Phosphate a most agree- 

 able, grateful and harmless stimulant^ 

 giving renewed strength and vigor to 

 the entire system. 



Dr. Edwin F. Vose, Portland, Me., says: 

 "I have used it in my own case when suffering 

 from nervous exhaustion, with gratifying re- 

 sults. I have prescribed it for many of the 

 various forms of nervous debility, and it has 

 never failed to do good." 



Descriptive pamphlet free on application to 

 Rumford Chemical Works, Providence, R. I. 



Beware of Substitutes antJ Imitations. 



For sale by all Druggists. 



New Catalogues of Scientific Apparatus. 



No. 245. " Standard Apparatus for Electrical Meas- 

 urements." 

 No. 250. " Ideal Projection Lanterns and Improved 



Focusing Electric Lamps." 

 No. 255. "The Eosa Curve Tracer." 

 No. 260. "Net Price List of X-Eay Apparatus." 

 No. 2&5. "The Rowland Electrodynamometer." 



No. 270. •' A Few Specialties for Colleges and 

 Schools." 



No. 275. "Condensers, — Standard and Commer- 

 cial." 



Cat. A. "The Chloride Accumulator." 



Cat. X. "Weston Standard Voltmeters, Ammeters, 

 Wattmeters, Etc." 



Write for such as interest 3'ou, but do not think that this list represents the entire scope of my trade. 

 I am a business helper to the buyer of scientific apparatus. I make a specialty of " Duty Free " Importations 

 from Europe. It will cost nothing to ascertain if I can assist you. Correspondence solicited. 



JAMES Q. BIDDLE, 909 Drexel Building, Philadelphia. 



Inyertelbrate Specialties. ^T ""f IZ'' 'r°'-'"1 °^ ^^'"'^'^^^Vl^ 



"^f^^ " ^■^■^'~^' sectioned shell, and animal in place, price S7-S12 ; 



the rare and beautiful METACRINUS from Japan, 24-30 inches long, S14-516; model showing 

 anatomy of the PRECIOUS COKAL, $12 ; accurate life-size model of OCTUPUS that spread 25 

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 brate Stock, Systematic Collections, Zoological Charts and Biological Supplies. 



Ward's Natural Science Establishineiit, 



18 to 28 College Ave., Rochester, N. Y. 



ElsclricalUpparaiiis 



Incorporated 

 1894. 



COMPLETE LABORATORY EQUIPMENT OF OUR OWN MANUFACTURE. 

 X-RAY APPARATUS AND CROOKE'S TUBES A SPECIALTY. 



Catalogue P Free to Scliool ZIEGLER ELECTRIC CO., " Duty Free" Importations from 



Offlciais and Science Teacliers. 141 Franklin St., BOSTON, MASS. Foreign IManufacturers. 



