SCIENCE.— AD VERTISEMENTS. 



RARE MINERALS. 



THAUMASITE, from Paterson, N. J., a sulphate, silicate and 

 carbonate of calcium, pure white, 25c. 



EKDEMITE, bright yellow on red wulfenite, Arizona, SOc. 



NATIVE ARSENIC, Japan, 14 to %-iuch crsytallized balls, 

 25c, 35c. 



Collections for Schools. 



ALPHA COLLECTION, twenty-five specimens in trays, con- 

 tained in a neat wooden box and accompanied by a hS- 

 page guide book (XIIL, Guide for Science Teaching, Bos- 

 ton Society of Natural History), Price, complete, $1.00. 



CABINET COLLECTIONS, 100 specimens, small size, $5.00. 

 100 specimens, large size, $10.00. These specimens are 

 each accompanied by a label giving name, system of 

 crystallization, chemical formula, and locality, and make 

 a good working collection for a student. 



EXCELSIOR COLLECTION for high schools and colleges. 

 200 specimens, nicely mounted on wooden blocks, with 

 beveled fronts for receiving labels. Price, packed, 

 $100.00. School Bulletin just out. 



Loose Crystals. 



Small packages of free crystals for crystallographic study 

 may be sent for inspection by mail at small cost. Ap- 

 proval boxes of cabinet specimens by express or freight. 



ROY HOPPING, 



MINERAL DEALER, 



NEW YORK. 



504=506 Liberty Building, 

 Liberty and Greenwich Sts. 



Cambrian Fossils. 



A large collection of Upper 

 Mississippi Cambrian fossils 



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



Trilobites. Send for low prices. 



W. A. FINKELNBURG, WiNONA, MfNN. 



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



THE MICROSCOPE ^S^L'^^I^T^.l'bT" 



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. 

 NEURAL TERMS, International and National. 



By Burt G. Wilber, M. D., Prof ssor of Neurology, etc., in 

 Corntril University. Rt- printi d from the Journal of Coupaka- 

 TrvE Neurology, VI., December, 1S96 A treatise on the prin- 

 ciples and practice of anatomic Nomenclature with sppcial refer- 

 ence to tbe brain. Pp. 137, including 7 Tables. Price, postpaid, ?]. 



Also, List of Neural i erma, wi h Comments and Bib iography, 

 being PartsVII-IXnf the above. 52 pp., of which 17 are occupied 

 by liRt- of terms adopted by the Assoc, of Amer. Anatomi-'ta, the 

 Amer. Neur. Assoc , the Amer Assoc, for the Advanc. of Science, 

 and th<- Auatomische Ges llachaft. Price, posptpaid, 50 cents. 



Address HENRY COWELL, McGraw Hall, Ithaca, N. Y. 



Harvard University. 



Lawrence Scientif'/c School 



OF^FERS COURSES IN 



Chemistry, 

 Geology, 



Botany and Zoology, 



Civil Engineering, 



Mechanical Engineering, 

 Electrical Engineering, 



Mining Engineering, General Science, 



Arciiiteclure, Science for Teachers, 



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



J^or Descriptive Pamphlet apply to 



M. CHAMBERLAIN, Secretary, 

 N. S SHALER, Dean. Cambridge, Mass. 



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. 



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, of leading Western Indians. 

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

 on selection. Give reference. After seeing sample you will 

 want others. Indian Costume, Ornaments and Weapons. 

 15,000 Flint Stone Ancient Indian Relics. 100,000 Mineral 

 and F'ossil Specimens. Catalogue for stamp. 13th year. 

 li. "W. STILWELIi, Deadwood, Sonth Dak. 



HOUGH'S "AMERICAN WOODS" 



A publication Illustrated by actual specbnens. 



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 ot 

 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. 



