Vol. IX. Part 2 



April, 1919 



THE 



JOURNAL 



OF 



AGRICULTURAL SCIENCE 



EDITED RY 



Professor R. H. BIFFEN, M.A., F.R.S., Cambridge 

 Sir a. D. HALL, K.C.B., M.A., F.R.S., Board of Agriculture, London 

 E. J. RUSSELL, D.Sc, F.R.S., Rothamsted Experimental Station, Harpenden 

 Professor T. B. WOOD, C.B.E., M.A., F.R.S., Cambridge 



IN CONSULTATION WITH 



Dr H. p. ARMSBY, State College, Pennsylvania, U.S.A. 



B. C. ASTON, Department of Agriculture, Wellington, New Zealand 



Dr C. a. barber. Agricultural College, Coimbatore, India 



Professor B, T. P. BARKER, M.A., National Fruit and Cider Institute, Long Ashton, Bristol 



W. BATESON, M.A., F.R.S., John Innes Horticultural Institute, Merton, Surrey 



J. R. CAMPBELL, B.Sc, Department of Agriculture, Dublin 



I. B. POLE EVANS, Department of Agriculture, Pretoria, Soutli Africi 



F. B. GUTHRIE, Department of Agriculture, Sjrdney, N.S.W, 



Professor J. HENJJRICK, B.Sc, Marischal College, Aberdeen 



J. W. LEATHER," V.D., F.I.C., Major 



Sir T. H. MIDDLETON, K.B.E., C.B., M.A., Board ot Agiicuhure, London 



F. T. SHUTT, M.A., F.I.C., Experimental Farms, Ottawa, Canada 



Professor \V. SOMERVILLE, M.A., D.Sc, School of Rural Economy, Oxford 



Dr a. C. true. Department of Agriculture, Washington, DC, U.S.A. 



Dr FRANCIS WATTS, C.M.G., Barbados 



Dr H. J. WHEELER, American Agricultural Chemical Co., Boston, Mass. 



Cambridge University Press 



C. F. Clav, Manager 



London : Fetter Lane, E.C. 4 



also H. K. Lewis & Co., Lid., 136, Cower Street, London, W.C. 



and William Wesley & Son, 28, Essex Street, London, W.C. 2 



Chicago : The University of Chicago Press 



Bombay, Calcutta, Madras: Macmillan and Co., Ltd. 



Toronto : J. M. Dent and Sons, Ltd. 



Tokyo: The Maruzen-Kabushiki-Kaisha 



^rice Five Shillitigs 'r?e 



[Issued 25 Afril, 1919.] 



