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VOLUIVLE XLIX 

 i917c 



EDITED BY 



DR. E. M. WALKER, 



Biological Department. 

 UNIVERSITY OF TORONTO, TORONTO 



EDITORIAL COMMITTEE 



A. W. Baker 

 A. Gibson 



W. H. Bnttain 

 F. J. A. Morris 



L. Caesar 



R. C. Treherne 



N. Cnddle 

 A. F. Wmn 



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



ONTARIO AGRICULTURAL COLLEGE, GUELPH. ONT. 



ILontion, ©ntavio : 

 Tlie London Printin;; :nul Lithographing C'onii)nny I.iniitcd 



1917. 



