Vlll THE BOOK OF WHEAT 



these needs was one that would appeal to the popular reader 

 as well as to the student, instructor and experimenter. Treated 

 from the American point of view, the subject demanded a less 

 detailed consideration for foreign countries. 



The book is the result of fifteen years of personal experience 

 in the wheat fields of our Northwest, and of a careful study of 

 the works listed in the appended bibliography. Not a little 

 additional information was obtained from several hundred let- 

 ters written on phases of the subject with which I was not 

 sufficiently familiar, and concerning which little material that 

 was recent or reliable could be found in the literature. Space 

 limited the references in footnotes to the most important ones. 

 If more detailed information is desired on certain subjects than 

 the limits of the book have permitted, references quite ample 

 for all purposes will be found in the topical index of authors 

 included in the bibliography. P. T. D. 



New Haven, Conn., May 1, 1908. 



