THE JOURNAL 



EXPERIUENTAL ZOOLOGY 



EDITED BY 



William E. Castle 



Harvard University 



Edwin G. Conklin 



Princeton University 



Charles B. Davenport 



Carnegie Institution 



Herbert S. Jennings 



Johns Hopkins University 



Frank R, Lillie 



University of Chicago 



Jacques Loeb 



The Rockefeller Institute 



Edmund B. Wilson 



Columbia University 



Thomas H. Morgan 



Columbia University 



George H. Parker 



Harvard University 



Raymond Pearl 



Johns Hopkins University 



Charles 



5TOCKARD 

 Cornell Universit^j edical College 



Ross G. Harrison, ye university 



Managing Ed^ 



VOLUME 

 AUGUST— NOVEMBpr^ 1921 



THE WISTAR INSTITUTE OF ANATO\y AND BIOLOGY 

 PHILADELPHIA, PA. 



