ON 



ECONOMIC BIOLOGY. 



BY 



WALTER E. COLLINGE, M.Sc., F.L.S., F.E.S., 



Foreign Member of the American Association of Economic Entomologists; 

 Joint Honorary Secretary of the Association of Economic Biologists' 

 Editor of the "Journal of Economic Biology"; Honorary 

 Consulting Biologist to the Land Agents' Society, the ' 

 Midland Reafforesting Association, and the War- 

 wickshire Agricultural Society; and late Special 

 Lecturer on Econonic Zoology in the 

 University of Birmingham. 



ILLUSTRATED, 



BIRMINGHAM : 



THE MIDLAND EDUCATIONAL CO., LTD. 

 1911. 



[All rights reserved.] 



PRICE 2a. 6d. 



