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) 



AND 



Professor B. T. P. BARKER, National Fruit and Cider Institute, Bristol 



Dr S. E. CHANDLER, Imperial Institute, London 



F. J. CHITTENDEN, Royal Horticultural Society's Gardens, Wisley 



J. C. F. FRYER, Board of Agriculture and Fisheries, London 



Professor F. W. GAMBLE, The University, Birmingham 



Professor PERCY GROOM, Imperial College of Science and Technology, London 



Dr a. D. IMMS, Rothamsted Experimental Station, Harpenden 



Professor R. NEWSTEAD, The University, Liverpool 



Professor J. H. PRIESTLEY, The University, Leeds 



VOLUME V 1918-19 



CAMBRIDGE 



AT THE UNIVERSITY PRESS 

 1919 



