SCIENCE.— AD VERTISEMENTS. 



LEMCKE & BUECHNER 



Formerly B. Westj:emann & Co. 

 Established 1S4S 



Foreign Booksellers Importers 



812 BROADWAY, NEW YORK 

 SIXTH EDITION. 



THE MICROSCOPE '^K^ESr 



By SIMON HENRY GAGE, 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 Clieinistry, Cliemical 

 Teclinology and Pliysics. 



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. 



Horsford's Acid Phosphate. 



Is the most effective and agreeable 

 remedy in existence for preventing in- 

 digestion, and relieving those diseases 

 arising from a disordered stomach. 



D. W. W. Gardner, Springfield, Mass., 

 says: "I value it as an excellent preventive 

 of indigestion, and a pleasant acidulated drink 

 when properly diluted with water and sweet- 

 ened." 



Descriptive pamphlet free on application to 

 Rumford Chemical Works, Providence, R. I. 



Beware of Substitutes and Imitations. 



For sale by all Druggists. 



MAX KOHL^ Chemnitz^ Germany^ 



FIRST EUROPEAN MAKER OF 



Physical and £21ectrical Instruments 



Special Manufacturer of Roentgen X-Kay Outfits. 



Apparatus for Experiments wltli Currents of HJgli Frequence and Tension. 



Apparatus for the Experiments according to Hertz. 



Apparatus for Marconi's Wireless Telegraphy. 



Price List No. 10 of Physical Instruments ; nearly 400 pages and more than 1300 engravings (in German, English 

 ana Irench). Special List of X-Ray Apparatus containing numerous testimonials as well as estimates tor complete 

 outnts, explicit directions for use, etc., in English language. 



Xm- REFERENCES FROM LEADING EXPERTS. -^S. 



Representaiive : Messps. EIMER & AMEND, 205-211 Third Avenue, New York. 



PHYSIGAL, CHEMICAL, MICROSGOPIGAlflND [[[CTRICAL APPARATUS. 



Established 

 1882. 



COMPLETE LABORATORY EQUIPMENT OF OUR OWN MANUFACTURE. 

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



Catalogue P Free to School 

 Officials and Science Teachers. 



ZIEGLER ELECTRIC CO., "Duty Free "importations from 



141 Franklin St.. BOSTON, M^SS. Foreign Manufacturers. 



Rare Minerals. 



THAtJMASITE from West Paterson, N. J., a unique compound of the 



sulphate, silicate and carbonate of calcium with 42 per cent, of water. 



An excellent, attractive, cabinet size specimen, postpaid for 14 cents, 



Tapnn, in balls % to %-mch. diameter, postpaid, 16 cents. CONTACT TWINS OF 



roups, 28 cents, postpaid. MOUNTAIN I.EATHEK, a 



CKTSTAttlZED AKSENIC fro 



QCAKTZ, postpaid, Sl.OO. TWISTED STIBNITE crystals and „ . ., 



^r eat nov elty, postpaid, lie, 16c., 22c. and 27c. liJ4-page Catalogue, describing every mineral, 25g. in paper ; 50g. in cloth 

 44-page Price-Llst, 4c. Bulletins and Circulars Fn 



GEO. L. ENGLISH Sc CO., Mineralogists, 64 E. 12tli St., New York. 



