Preface vii 



ment of Agriculture have likewise given many valuable 

 suggestions while vising the manuscript: Dr. W. D. 

 Hunter, and Dr. W. D. Pierce of the Bureau of Entomol- 

 ogy; Dr. F. J. Cameron, and Prof. Tom Carter of the Bur- 

 eau of Soils; Prof. C. R. Ball, Prof. S. H. Hastings, Prof. 

 W. H. Long, Prof. C. W. Warburton, and Prof. D. A. 

 Saunders of the Bureau of Plant Industry; to Prof. A. D. 

 McNair for assistance on the chapter on Legumes; and 

 to Dr. David Griffith for the chapter on Pastures, both of 

 the Bureau of Plant Industry, U. S. Department 'of Agri- 

 culture; also to Prof. A. H. LeicKgh of the Kansas Agri- 

 cultural College for the chapter on Sorghums, and to 

 Prof. J. C. Whitten and Dr. W. L. Howard of the Depart- 

 ment of Horticulture, University of Missouri, and Prof. 

 J. L. Lloyd of the University of Illinois for assistance 

 on the chapters on Garden and Orchard Crops. 



Special acknowledgment is due Prof. J. B. Davidson, 

 of Iowa State College for the chapter on Farm Machinery. 

 Illustrations have been selected for their accuracy, 

 suggestiveness and educational value. Acknowledgment 

 is due to many officials of the U. S. Department of 

 Agriculture, and to the Kansas Agricultural College for 

 the use of a number of illustrations by Prof. A. M. 

 TenEyck. Other acknowledgments are made in connec- 

 tion with particular illustrations. 



TO TEACHERS 



In using the text it is recommended that the course 

 extend troughout the session and that the order of the 

 text be followed up to page 117. Suggestions for seasonal 

 projects are given in chapter 35, paragraphs 133, 213a, 

 and in the two last chapters. 



