

THE J0URNAL 



01' 



EXPERIMENTAL ZOOLOGY 



fEDITED BY 



William E. Castle 



Harvard University 



Edwin G. Conklin 



Princeton University 



Charles B. Davenport 



Carnegie Institutior 



Herbert S. Jennings 



Johns Hopkins Ui/ersity 



Frank R. Lillib 



University of Oil 



/ 



Jacques Loeb 



The Rockefeller Institute 



Edmund B. Wilson 



Columbia University 



Thomas H. Morgan 



Columbia University 



George H. Parker 



Harvard University 



Raymond Pearl 



Maine Agricultural 

 Experiment Station 



and 



Boss G. Harrison, Yale University 

 Managing Editor 



VOLUME 30 

 JANUARY— MAY, 1920 



THE yTAR INSTITUTE OF ANATOMY AND BIOLOGY 

 PHILADELPHIA, PA. 



