PREFACE. 



The experiments described in the present paper are a con- 

 tinuation of those dealt with in a previous communication (Mem. 

 Dept. Agr. in India, BoU Ser., No. 4, Vol. Ill, 1910). 



We desire to take this opportunity of expressing our indebted- 

 ness to several officers of the Indian Agricultural Department for 

 their valuable co-operation in the conduct of this work. For facili- 

 ties at Dumraon and Bankipore we are indebted to Mr. F. Smith, 

 Deputy Director of Agriculture, Bengal. Dr. Parr and Mr. B. C. 

 Burt, the Deputy Directors of Agriculture of the United Provinces, 

 have assisted us at Aligarh and Orai respectively. At Meerut, Babu 

 Jagannath Pershad gave us all facilities on his farm. Khan Baha- 

 dur Mohamad Hadi has kindly placed the resources of the 

 Partabgarh Experiment Station at our disposal, while at Lyallpur, 

 Mr. W. Roberts, Professor of Agriculture, has been good enough to 

 assist in the work. For facilities at Hoshangabad in the Narbada 

 Valley we are indebted to Mr. G. Evans. At Raipur, in the 

 Chattisgarh Division of the Central Provinces, Mr. D. Clouston, 

 Deputy Director of Agriculture, has given us very valuable help. 



For the very large number of nitrogen determinations involved 

 in the work we are indebted to Dr. J. W. Leather, Imperial Agricul- 

 tural Chemist. 



In the milling and baking aspect of the subject we have been 

 fortunate enough to secure the invaluable assistance of Mr. A. E. 

 Humphries, formerly President of the National Association of British 

 and Irish Millers and a well-known authority on these questions. 



Albert Howard, 

 quetta, H. Martin Leake. 



August 5th, 1912, Gabrielle L. C. Howard, 



