viii BIOLOGY 



GRASS-LAND AND ARABLE- p age 



R. G. Stapledon, M.A., Director of the Food 

 Production Department's Seed-testing Station 119 



SPRAYING PROBLEMS- 



A. S. Home, D.Sc. , of the Food -production 

 Department Board of Agriculture and Fisheries 139 



BIRDS AND INSECTS IN RELATION TO CROPS 



Sydney J. Hickson, F.R.S., Professor of Zoology 



in the University of Manchester 159 



CO-OPERATION IN FOOD SUPPLY- 



A. G. Tansley, F.R.S., Lecturer in Botany in 



the University of Cambridge - 177 



THE PHYSIOLOGICAL ASPECTS OF FLYING 



Lieut. -Col. Martin Flack, M.A., M.B. - 195 



THE ANAEROBIC TREATMENT OF WOUNDS- 



R. C. McLean, D.Sc., Bacteriologist, Reading 

 War Hospital - 211 



SUBSTITUTION OF RAW MATERIALS PAPER- 



F. W. Oliver, F.R.S., Professor of Botany in 

 University College, London - 229 



INDUSTRIA'L EFFICIENCY AND FATIGUE- 



H. M. Vernon, M.D., Fellow of Magdalen 

 College, Oxford, and University Lecturer in 

 Chemical Physiology- - 247 



FRESH AIR AND EFMCIENCY- 



Henry Kenwood, C.M.G., M.B., D.P.H., 

 F.R.S.E., Professor of Hiene and Public 





Health in the University of London - - 269 



