The American Naturalist 



i-Hudson, New York. 



is and advertisements should be sent to the publishers. The 

 i is four dollars a year. Foreign postage is fifty cents and 

 Canadian postage twenty-five cents additional. The charge for single copies is 

 forty cents. The advertising rates are Four Dollars for a page. 



THE SCIENCE PRESS 

 Lancaster, Pa. Garrison, N. Y. 



NEW YORK : Sub-Station 84 



FOR SALE 



ARCTIC, ICELAND and GREENLAND 

 BIRD8' SKINS, 

 Well Prepared Low Prices 



Particulars of 

 G. DINESEN, Bird Collector 



TENTH EDITION. 



THE MICROSCOPE, 



an introduction to Microscopic Methods and to Histology, 

 by 8IMOH Hbnby Gaok, of Cornell University. Over 

 350 large octavo pages and above 250 fignres in this new 

 and fully revised^dltion. Price $2.00, postpaid. 

 COMSTOCK PUBLISHING CO., Ithaca, N. Y. 



Reptiles, Amphibians ! 

 and Fishes 



W. F. H. 



57, Haverstock Hill, London, N. W., 



begs to announce the publication of a new Price List 

 (No. 15) of Reptiles, Batrachians and Fishes contain- 

 ing over 400 species from all parts of the World. This 

 jnveniently arranged for reference, 



rlistsT" ° aPpllCatl0n M WlU tbe 



University of Colorado 



Mountain Laboratory 



Courses in Field Biology (animal and 

 plant), Ecology, Systematic Botany, Bi- 

 ology of Ponds and Streams. Suitable 

 work for undergraduates and graduates. 

 Daily Field € 



The laboratory is at Tolland, Colo., in 

 the Rocky Mountains at an altitude of 

 8,889 feet. Climate cool and healthful. 

 Fees and expenses moderate. 



For pamphlet address the professor in 



I Apparatus, i 

 .Largest stock in the w» 

 anches of Zoology. 



Dr. Francis Ramaley 



University of Colorado 

 BOULDER COLORADO 



