SCIENCE.— AD YERTISEMENTS. 



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. 



Collections for Schools. 



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

 tained in a neat wooden box and aecoinpanied by a h(y- 

 page guide book (XIII., Guide tor 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 iMzt o\A. 



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, 



504-506 Liberty Building, 



Liberty and Greenwich Sts. 



NEW YORK. 



Pamhrian Pneeile ^ I'^'s^ collection of Upper 



UalllUllall rUSalia. Mississippi Cambrian fossils 

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

 Trilobites. Send for low prices. 



W. A. FINKELNBURG, WINONA, MiNN. 



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



THE MICROSCOPE ^SSuTe^t^hI^dT- 



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, greatlyenlarged, 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. Wilder, M. D., Professor of Neurology, etc., in 

 Cornell University. ReprintPd from the Journal op Compara- 

 tive Neukolog V, VI., December, 1896. A treatise on the prin- 

 ciples and practice of anatomic Nomenclature with special refer- 

 ence to the brain. Pp. 137, including 7 Tables. Price, postpaid, $]. 



Also, List of Neural Terms, with Comments and Bibliography, 

 being Parts VII-IX of the above. 52 pp., of which 17 are occupied 

 by lists of terms adopted by the Assoc, of Amer. Anatomists, the 

 Amer. Neur. Assoc, the Amer. Assoc, for the Ad vane, of Science, 

 and the Anatomische Gesellschaft. Price, posptpaid, 50 cents. 



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



Harvard University. 



Lawrence Sc/hwt/f/c School 



Of^FERS COURSES IN 



Civil Engineering, Chemistry, 



Mechanical Engineering, Geology, 



Electrical Engineering, Botany and Zoology, 



Mining Engineering, General Science, 



Architecture, Science for Teachers, 



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



For Deacriptive Pamphlet apply to 



M. CHAMBERLAIN, Secretarv, 

 N. S. SHALER, Dean. Cambridge, Mass. 



For Brain-Workers, 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 debihtated 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. 



X*ox- Xa CexLts 



I will mail a finely finished original photo, 

 cabinet size, of Sioux Indian Cliief, SITTING 

 BULL, with his Signature. Have 200 sub- 

 jects, all diSerent, of leading Western Indians. 

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

 on selection. Give reference. Aiter seeing sample you will 

 want others. Indian Costume, Ornaments and Weapons. 

 15,000 Flint Stone Ancient Indian Relics. 100.000 Mineral 

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

 I.. W. STILWEIili. Deadwood, South Dah. 



HOUGH'S "AMERICAN WOODS" 



A publication illustrated by actual speciTnens. 



WOODS FOR THE STEREOPTICQN 



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 oi 

 grain under each cover glass. 



WOOD SPECIMENS FOR GLASS 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, Lowvllle, N. Y. 



