Cbe 



(ttaiiailiaH #utom0l03fet 



VOLUME LI. 

 1919. 



EDITED BY 



DR. E. M. WALKER, 



Biological Department, 

 UNIVERSITY OF TORONTO, TORONTO 



EDITORIAL COMMITTEE : 



A. W. Baker W. H. Brittain L. Caesar N. Criddle 



A. Gibson F. J. A. Morris R. C. Treherne A. F. Winn 



Editor Emeritus: REV. C. J. S. BETHUNE. 



ONTARIO AGRICULTURAL COLLEGE, GUELPH, ONT. 



HanOon, Gntarto : 

 The London Printing and Lithographing Company Limited 



1919. 



