SCIENCE.— AD VERTISEMENTS. 



Scientific Apparatus 



From Europe. 



When considering hoio to import European Scien- 

 tific Apparatus for Fall delivery, I want you to re- 

 member my long experience in this business, and the 

 excellent facilities I have for handling " Duty Free " 

 orders. Through special agents when necessary, and 

 by direct correspondence, I keep "in touch" with 

 the best manufacturers, and guarantee to supply their 

 latest and most approved forms of apparatus at the 

 same cost to my clients as would be paid the makers 

 themselves. 



"Write to me concerning your next order, whatever 

 it may be. If I cannot handle it to yotir advantage 

 I will say so frankly. 



I have a very complete file of catalogues from the 

 best instrument houses in America and Europe. 

 These are at the service of my customers. 



JAMES Q. BIDDLE, 



Dealer, Manufacturer's Agent and Importer, 



909 Drexel Building, PHILADELPHIA. 

 McGILL UNIVERSITY, MONTREAL, 



CHAIR OF ZOOLOGY. 



The Governors of McGlU University are prepared to re- 

 ceive applications for appointment to the newly-founded 

 Professorship of Zoology. Salary, $2500 per annum. Candi- 

 dates are sequested to forward applications, with any testi- 

 monials and references they may desire to submit, on or be- 

 fore first of June to 



W. "VAUGHAN, 

 Secretary, McGill University, IVIontreal. 



Pamhrian Tnecilc a large collection of Upper 

 ualilUI lall ruoollo. Mississippi Cambrian fossils 

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

 Trilobites. Send for low prices. 



W. A. FINKELNBURG, WINONA, MINN. 



Dec. 



1896. Just Published. Sixth Edition of 



THE MICROSCOPE ^SSu'^^^E^T^.IJbT- 



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. 



Harvard University. 



Lawrence Scientific School 



OFFERS COURSES IN 



Clvtl Engineering, 



Mechanical EDgineering, 



Electrical Engineering, 



Mining Engineering, 



Chemistry, 

 Geology, 



Botany and Zoology, 

 General Science, 

 Arcbitecture, Science for Teachers, 



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

 For Descriptive Pamphlet apply to 



M. CHAMBERLAIN, Secretary, 

 N. 8. BHAXBB, Dean. Cambridge, Mass 



Alajic 



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 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. 1. 



For sale by all Druggists. 



Beware of Substitutes and Imitations. 



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. 



CoUections for Schools. 



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

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

 page guide book {XIII., 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. Hchool Bulletin just ont. 



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 Qreenwlch Sts. 



