IV PREFACE 



There is no question but that Cyanamid will play an import- 

 ant part in the future development of agriculture, and that a 

 great deal of research will be undertaken to broaden the knowl- 

 edge of its practical application. Much labor has been wasted 

 in the past by the pursuance of faulty methods, and a great 

 deal of work has been but the duplication of earlier efforts, 

 and has contributed little that was not known before. If the 

 publishing of this book will direct research into the fields that 

 still remain more or less unexplored, and if it is helpful in 

 avoiding the errors of past investigations, its purpose will have 

 been accomplished. 



NashviIvLK, Tenn. 

 January, 1913. 



