vol. ran, wo. m 



JANUARY, 1809 



THE 



AMERICAN 

 NATURALIST 



A MONTHLY JOURNAL 

 Devoted to the Advancement of the Biological Sciences with 

 Special Reference to the Factors of Evolution 



d Autodax lufubri* 



Frank E. Lutz. Experimental Zoology— The Influ* 

 and Temperstnre on the Growth of the Frog, Skkg: 

 ology— Cestodes of Birds, Professor Henry B. Ward 



THE SCIENCE PRESS 



LANCASTER, PA. GARRISON, N, Y. 



NSW YORK : SUB-STATION 84 



