SCIENCE.— AD VERTISEMENTS. 



Columbia Bicycles 



$■100 TO ALL ALIKE. 

 Standard of the World. 



POPE MFG. CO., Hartford, Conn. 



Pamhrilin Pnccilc A large collection of Upper 

 walllUllall ruooilo. Mississippi Cambrian fossils 

 from the St. Croix fPotsdam) sandstone for sale. Mostly 

 Trilobites. Send for low prices. 



W. A. FINKELNBURG, WiNONA, MiNN. 



Dec. 



1896. Just Published. Sixth Edition of 



THE MICROSCOPE ^S^LTe^T^.l'bT- 



By SIMON HENRY GAGE, Protessor of Microscopy, His- 

 tology and Embryology in Cornell Uniyersity and tbe 

 New York State Veterinary College, Ithaca, N. Y., U.S A. 

 Si.\th edition, rewritten , greatly enlarged, and illustrated 

 by 16.5 figures in the text. Price, $1.50, postpaid. 



COMSTOCK PUBLISHING 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. ABBOxr, Director of the Laboratory of Hygiene, 

 University of Pennsylvania, Philadelphia. 



Harvard University. 



Lawrence Scientific School 



OFFERS COURSES IN 



Civil Englnepring, Chemistry, 



Mechanical Engineering, Geology, 



Electrical Engineering, Botany and Zoology, 



Mining Engineering, General Science, 



Arcliitecture, Science for Teachers, 



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



For J^eacriptive Pamphlet apply to 



M. CHAMBERLAIN, Secretary, 

 N, S. SHALER, 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. I. 



For sale by all Druggists. 



Beware of Substitutes and Inutations. 



X^oxr 12 C3exits 



I will mail a finely finished original photo^ 

 cabinet size, of Sioux Indian Cliief, SITTING^ 

 BULL, witli 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. Alter seeing sample you will 

 want others. Indian Costume, Ornaments and Weapons. 

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

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



Ij. Xtr. STILWELIj, Deadwood, Sonth Dab. 



i» 



HOUGH'S "AMERICAN WOODS 



A publication illustrated by actual specimens. 



WOODS FOR THE STEREOPTICON 



Enabling you to show upon the screen characteristic 

 structures projected froua 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 Ci^OSS-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. 



