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PREFACE TO REPRINT 



A REPRINT of this book being needed, although urgency 

 precludes the making of a new edition, it should be of 

 use to the reader to know that the researches herein 

 described were subsequently developed appreciably further, 

 being thus brought into direct contact with the problems 

 of Agriculture on the one hand, and of the Spinning 

 Industry on the other. For a brief summary I would 

 refer to a lecture in the Journal of the Royal Society oj 

 Arts, Volume LXVI, No. 3415, and also to a book entitled 

 The Development and Properties of Raw Cotton, 

 Messrs. A. & C. Black, London, 1915. A detailed exposi- 

 tion of my method for studying Crop Physiology by 

 Curves of Development for the Average Plant will be 

 found in the Phil. Trans. Roy. Soc., under the title 

 " Analyses of Agricultural Yield, Parts J-III," 1915-1916. 

 (Signed) W. LAWRENCE BALLS. 



RESEAKCH DEPARTMENT, 

 THE FINE COTTON SPINNERS' AND DOUBLERS' ASSOCIATION, LTD. 



ST. JAMES'S SQUARE, MANCHESTER. 

 January 13th, 1919. 



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