f tnK!IV r D MAR I 3 1929 

 Price (to Non-Fellows) 5s. 



DECEMBER, 1915. 



Vol. XLI. Part 2. 



THE 



JOURNAL 



OF THE 



ii 



EDITED BY 



F. J. CHITTENDEN. F.L.S. 



The whole of the contents of this volume are copyright. For permission to 

 reproduce any of the articles application should be made to the Council. 



CONTENTS. 



PAQE 



Masters Lectures: Recent Investigations on the Production of Plant 



Food in the Soil. By E. J. Russell, D.Sc 173,180 



Flora of North- Western Yunnan. By G. Forrest 200 



The Clematis. By A. G. Jackman, F.R.H.S ... 209 



Respective Values of Organic and Inorganic Manures. By H. E. P. 



Hodsoll, F.I.C 217 



On Oidium Mildew on Carnations. By W. B. Mercer, B.Sc. 227 



Winter Washes tried at Wisley, 1914-15. By Prof. H. M. Lefroy, M A. .. 230 



Report of the Tulip Nomenclature Committee 234 



Phloxes at Wisley, 1915 250 



Pyrethrums at Wisley. 1915 265 



Early Peas at Wisley, 1915 277 



Early and Mid-season Potatos at Wisley, 1915 290 



Contributions from the Wisley Laboratory: 



XXIX— Report on Experiments with Bacterized Peat, or Humogen. 



By F. J. Chittenden, F.L.S 305 



Commonplace Notes 327 



Examinations in Horticulture 330 



Book Reviews 349 



Notes and Abstracts 365 



Extracts from Proceedings: General Meetings, p. Ixxxv ; Scientific 

 Committee, p. civ ; Fruit and Vegetable Committee, p. cxi ; Floral 



Committee, p. cxvii ; Orchid Committee, p. cxxxiv 

 Tulip Committee, p. cxlii. 



Notices to Fellows 



Advertisements Index to Advertisements 



Narcissus and 



cxlviii 



Advt. osges 34 and 35 



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