THE JOURNAL 



OF 



EXPERIMENTAL ZOOLOGY 



EDITED BY 



WILLIAM E. CASTLE 



Har'vard Uni-uersity 

 EDWIN G. CONKLIN 



Princeton Uni-uersity 

 CHARLES B. DAVENPORT 



Carnegie Insritution 

 HORACE JAYNE 



The Wistar Institute 

 HERBERT S. JENNINGS 



Johns Hopkins Uni-uersity 



FRANK R. LILLIE 



Unt--versity of Chicago 

 JACQUES LOEB 



U ni-Tjersity of California 

 THOMAS H. MORGAN 



Columbia Uniijersity 



GEORGE H. PARKER 



fjari'ard Uni-uersity 



CHARLES O. WHITMAN 



University of Chicago 



EDMUND B. WILSON, Columbia Uni-z>ersity 



and 



ROSS G. HARRISON, Yale Uni-versity 

 Managing Editor 



VOLUME VIII 



THE WISTAR INSTITUTE OF ANATOMY AND BIOLOGY 



PHILADELPHIA, PA. 



1910 



