Vol. VIII. Part 2 



March, 1917 



THE 



JOURNAL 



OF 



AGRICULTURAL SCIENCE 



EDITED BY 



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



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



E. J. RUSSELL, D.Sc, Rothamsted Experimental Station, Harpenden 



Professor T. B. WOOD, M.A., Cambridge 



IN CON.SULTATION 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, 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., F.I.C., Experimental Farms, Otuwa, 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. 



Cambridge University Press 



C. F. Clay, Manager 



London; Fetter Lane, E.C, 



Edinburgh: ioo. Princes Street 



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



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



Chicago : The University of Chicago Press 



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



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



Tokyo : The Maruzen-Kabushiki-Kaisha 



'Price Five Shillings net 



[Issued March 27, 191 7.] 



