PREFACE. 



The experiments described in the present paper are a continua- 

 tion of those dealt mth in two previous communications {Mem. 

 Deft. Agr. in India, Botanical Series, Vol. Ill, No. 4, 1910, and 

 Vol. V, No. 2, 1913). 



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 

 facilities at Dumraon and Banldpore we are indebted to Mr. G. 

 Sherrard, Deputy Director of Agriculture, Bihar. 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. 

 Mr. Sharma has kindly placed the resources of the Partabgarh Ex- 

 periment Station at our disposal. In the Punjab, Mr. Koberts, 

 Professor of Agriculture at Lyallpur, and Mr. Southern, Deputy 

 Director at Gurdaspur, have been good enough to assist in the 

 work, while in Sind, Mr. Henderson very kindly assisted us at Mir- 

 purkhas. For facilities at Hoshangabad in the Narbada Valley 

 we are indebted to Mr. G. Evans. At Raipur and at Tharsa in the 

 Eastern Circle of the Central Provinces, Mr. D. Clouston, Deputy 

 Director of Agriculture, has given us very valuable help. 



For the large number of nitrogen determinations involved 

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

 cultural 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 ques- 

 tions. 



Albert Howard. 



July 28th, 1914. H. Martin Leake. 



Gabrielle L. C. Howard. 



