SCIENCE.— AD VERTISEMENTS. 



SIXTH EDITION. 



THE MICROSCOPE '^MrST- 



By SIMON HENRY GAQE, Professor of Microscopy, His- 

 tology and Embryology in Cornell XJniversitv and the 

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

 Sixth edition, rewritten, greatlyenlarged, and illustrated 

 by 165 figures in the text. Price, $1.50, postpaid. 



COMSTOCK PUBLISHING CO., Ithaca, N. Y. 



I will mail a finely finished original photo, 

 cabinet size, of Sioux Indian Chief, SITTING 

 BULL, with his Signature. Have 200 sub- 

 jects, all different, ofTeading Western Indians. 

 First-class work. Cabinet Size for 10 cents each. Some sent 

 on selection. Giye reference. Alter seeing sample you will 

 want others. Indian Costume, Ornaments and Weapons. 

 16,000 Flint Stone Ancient Indian Relics. 100,000 Mineral 

 and Fossil Specimens. Catalogue for stamp. 13th year. 

 I.. 'W. STIL'WELU, Seadwood. Sonth Dak. 



NEW CATALOGUE. 



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

 larged to 64 pages, of our catalogue of 



Books on Chemistry, Chemical 

 Teclinology 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. 



Horsford's Acid Pho 



Is the most effective and 

 remedy in existence for pre 

 digestion, and relieving thd 

 arising from a disordered si 



D. W. W. Gardner, Spring 

 says : "I value it as an excelle 

 of indigestion, and a pleasant acii 

 when properly diluted with wate 

 ened." 



Desciiptive pamphlet free on applia 

 Rumford Chemical Works, Providi 



Beware of Substitutes and Imitati 



For sale by all Drug; 



New Catalogues of Scientific Appara 



No. 245. " Standard Apparatus for Electrical Meas- 

 urements. ' ' 



No. 250. " Ideal Projection Lanterns and Improved 

 Focusing Electric Lamps. ' ' 



No. 255. '-The Rosa Curve Tracer." 



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



No. 265. "The Rowland Electrodynamometer." 



Write for such as interest you, hut do not think that this list represents the entire scopi 



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

 rem Europe. It will cost nothing to ascertain it I can assist you. Correspondence solicited. 



No. 270. " A Few Specialties for 



Schools." 

 No. 275. "Condensers, — Standard 



cial." 

 Cat. A. "The Chloride Accumulator 

 Cat. X. "Weston Standard Voltmet( 



Wattmeters, Etc." 



JAMES Q. BIDDLE, 909 Drexel Building, Phila 



Complete Mineral Catalogue. 



186 pages, 40 splendid enj 



tains a table giving name, c 

 form of all known mineral; 

 ment tjringing the work up t 

 classification showing what i 

 each element. Alphabetical index of names. Lists giving the specimen values of minerals, etc., etc. For teJ 

 collectors, mining experts, chemists, and others. Postpaid; Paper, 35 cents ; Cloth, 50 cents; Cal/,inie 



Es 



DR. A. E. FOOTE, 1317 Arch Street, Philadelphia, Pa., U.S.A. 



COLLECTIONS OF MINERALS FOR STUDY OR REFERENCE. CABINET SPECIMENS. G 



CABIMET SPECIMEMS. BEST 



SYSTEMATIC COLLECTIONS. PI 



FOR LABORATORY USE. IN 1 



124=page Illustrated Catalogue, giving crystallographio system, hardness, specific gravity, 

 position and formula of every mineral. 25c. in paper ; 5Uc. in cloth. 



44=page Illustrated Price Lists, 4c. Circulars and Bulletins Free. 



GEO. L. ENGLISH & CO., Mineralogists, 64 E. 12th St 



MINERALS. { 



