PREFACE ix 



mittee on methods of teaching agriculture of the Asso- 

 ciation of American Agricultural Colleges and Experi- 

 ment Stations. 



The author will be glad to correspond with teachers 

 concerning difficulties in the work, and also to receive sug- 

 gestions as to changes that they find desirable in the text. 



G. F. WARREN. 

 ITHACA, N. Y., June 21, 1909. 



