THE AMERICAN JOURNAL 
OF 
ANATOMY 
EDITORIAL BOARD 
CHARLES R. BARDEEN 
University of Wisconsin 
Henry H. DoNnaLpson 
G. Cart HuBER 
University of Michigan 
GEORGE S. HUNTINGTON 
J. Puayrairn McMourrica 
University of Toronto 
GerorceE A. PIERSOL 
The Wistar Institute Columbia University University of Pennsylvania 
Simon H. Gage Henry McE. KNowiR, SECRETARY 
Cornell University 
University of Cincinnati 
VOLUME 27 
MARCH—SEPTEMBER, 1920 
THE WISTAR INSTITUTE OF ANATOMY AND BIOLOGY 
PHILADELPHIA, PA. 
