THE 



JOURNAL 



OF 



AGRICULTURAL SCIENCE 



EDITED BY 



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

 A. D. HALL, M.A., F".R.S., Development Commission, London 

 E. f. RUSSELL, D.Sc, Rotliamsted Experimental Station 

 Professor T. B. WOOD, M.A., 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 Asliton. Bristol 



W. BATESON, M.A., F.R.S., John Inncs Horticultural Institute, Werton, Surrey 



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



I. B. POLE EVANS, Department of Agriculture, Pretoria, South Africa 



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



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



J. W. LEATHER, V.D., F.I.C., Agricultural Research Institute, Pusa, Bengal 



T. H. MIDDLETON, C.B., M.A., Board of Agriculture, London 



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



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



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



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



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



Volume VII 1915 i6 



NBIf Y4IIHC 



Cambridge University Press 



C. F. Cla^i', Manager 



London : Fetter Lane, E.C. 



Edinburgh: ioo. Princes Street 



also H. K. Lewis & Co., Ltd., 136, Gower Street, London, W.C. 



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



Chicago : The University of Chicago Press 



BoMB.^Y, Calcutta and Madras: Macmillan and Co., Ltd. 



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



Tokyo : The Maruzen-Kabushiki-Kaisha 



[All rifilits reser.'eil] 



