SCIENCE.— AD VER TISEMENTS. 



Scientific Apparatus 



From Europe. 



"When considering how 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 your 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. 



Cambrian Fossils. 



McGILL UNIVERSITY, MONTREAL, 



CHAIR OF ZOOLOGY. 



The Governors of MoGill University are prepared to re- 

 ceive applications for appointment to the newly-founded 

 Professorship of Zoology. Salary, S2B00 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. Montreal. 



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, WlWONA, MiNN. 



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



THE MICROSCOPE ^SSuTe^lfDJ:'- 



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 16B figures in the text. Price, $1.50, postpaid. 



COMSTOCK PUBLISHING CO., Ithaca, N. Y. 



Harvard University. 



Lawrence Scientific School 



OFFERS COURSES IN 



Chemistry, 

 Geology, 



Botany and Zoology, 



Civil Engineering, 



Mechanical Engineering, 

 Electrical Engineering, 

 Mining Engineering, General Science, 



Arcbitecture, Science for Teachers, 



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

 ^or Descriptive Pamphlet apply to 



M. CHAMBERLAIN, Secretary, 

 W, 8. SHALER, Dean. Cambridge, Mass 



For Brain-^A^orkers, the Weak and 

 Debilitated. 



Horsford's Acid Phosphate 



is without exception, the Best Remedy 

 for reheving 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 c 

 rangement of the cerebral and nervous syster 

 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- X2 Oezxts 



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 Indiana. 

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

 on selection. Give reference. After seeing sample you will 

 want others. Indian Costume, Ornament* and Weapons. 

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

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

 li. W. SXIL'WELIi, Deadwood, South Dab. 



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 ol 

 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 stereoptioon 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 ior 

 our circulars and sample specimens. 



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



