SGIENGE.—AD VERTISEMENTS. 



New Cataiogues. 



I issue new catalogues of Scientific Apparatus 

 every month or so and am always glad to send them 

 to college professors and other interested scientists. 



PRICE-LISTS JUST ISSUED. 



Number 195. 



Rowland D'Arsonval Galvanometers ; Wall and 

 Table Patterns. 



Number 200. 



" W-S " X-Eay Plants; comprising seven outfits, 

 with illustrated descriptive matter. 



Number 205. 



Cable Testing Apparatus, Meter Bridges, Con- 

 ductivity Apparatus, etc. 



Number 210. 



"Willyoung Adjustable Condensers, and Standard 

 Mica Condensers. 



Number 215. 



Elementary Laboratory Apparatus, chiefly Elec- 

 trical. 



Number 225. 



Willyoung Induction Coils, with " Ideal " Auto- 

 matic Vibrator. 



James Q. Biddle, 



Dealer, Manufacturers' Agent and Importer, 



909 Drexel Building, Pliiladelphia. 



Pamhpian Tnecilc ^ ''"'§« collection of Upper 

 UalllUI lail I uaoiio. Mississippi Cambrian fossils 

 from the St. Croix (Potsdam) sandstone for sale. Mostly 

 Trilobites. Send for low prices. 



W. A. FINKELIMBURG, WiNONA, MiNN. 



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



THE MICROSCOPE ^SSu'l^^E^l'bT- 



By SIMON HENRY OAQE, 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 166 figures in the text. Price, $1.50, postpaid. 



COMSTOCK PUBLISHINQ CO., Ithaca, N. Y. 



The Thomas A. Scott Fellowship in Hygiene, 

 University of Pennsylvania. 



The Scott Fellowship in Hygiene at the University of Penn- 

 sylvania falls vacant October 1st, 1897. Individuals desirous 

 of applying for appointment to the position can obtain de- 

 tails of the governing regulations by communicating with 

 Prof. A. C. Abbott, Director of the Laboratory of Hygiene, 

 University of Pennsylvania, Philadelphia. 



Harvard University. 



Lawrence Scientific School 



OFFERS COURSES IN 



Civil EDgineerlDg, Chemistry, 



Mechanical EDglneering, Geology, 



Electrical Engineering, Botany and Zoology, 



Mining Engineering, General Science, 



Architecture, Science for Teachers, 



Anatomy and Physiology (as a preparation for Medical Schools). 



For Descriptive Pamphlet apply to 



M. CHAMBERLAIN, Secretary, 

 N, S. SHALEE, Dean. Cambridge, Mass. 



A7^/c 



For Brain-^A^orkers, the Weak and 

 Debilitated. 



Horsford's Acid Phosphate 



is without exception, the Best Remedy 

 for relieving Mental and Nervous Ex- 

 haustion; and where the system has 

 become debilitated by disease, it acts 

 as a general tonic and vitalizer, afford- 

 ing sustenance to both mind and body. 



Dr. E. Cornell Esten, Philadelphia, Pa., 

 says: " I have met with the greatest and most, 

 satisfactory results in dyspepsia and general de- 

 rangement of the cerebral and nervous systems,, 

 causing debility and exhaustion." 



Descriptive pamphlet free on application to 

 Rumford Chemical Works, Providence, R. I. 



For sale by all Druggists. 



Beware of Substitutes and Imitations. 



Z*oxr IS C7exxts 



I will mail a finely finished original photo, 

 cabinet size, of Sioux Indian Chief, SITTING 

 BULL, with his Signature. Have 200 sub- 

 jects, all difierent, of leading Western Indians. 

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

 on selection. Give reference. Alter seeing sample you will 

 want others. Indian Costume, Ornament! and Weapons. . 

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

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

 L. 'W. STILWELIi, Deadwood. Sonth Pah. 



HOUGH'S "AMERICAN WOODS" 



A publication illustrated by actual specimens. 



WOODS FOR THE STEREOPTICON 



Enabling you to show upon the screen characteristic ■ 

 structures projected from nature itself. 



WOODS FOR THE MICROSCOPE 



Sections 1-1200 in. thick showing three distinct views of - 

 grain under each cover glass. 



WOOD SPECIMENS FOR CLASS USE 



Nothing equals these for use in the class-room. 



VIEWS OF TYPICAL TREES 



From Nature, photographs and stereopticon views. 



WOODEN CROSS-SECTION CARDS 



Perfectly adapted to printing (with type or steel plate), 

 painting, India ink work, etc. 



If you are interested in wood or trees in any way send for 

 our circulars and sample specimens. 



Address R. B. HOUGH, Lowville, N. Y. 



