THE ANNALS OF 

 APPLIED BIOLOGY 



THE OFFICIAL ORGAN OF THE ASSOCIATION 

 OF ECONOMIC BIOLOGISTS 



EDITED BY 



E. E. GREEN, Way's End, Camberley (late Government Entomologist, Ceylon) 



WITH THE ASSISTANCE OF THE COUNCIL 



VOLUME VI 1919 20 



CAMBRIDGE 



AT THE UNIVERSITY PRESS 



I 920 



