PREFACE ix 



the University of California Farm School; J. C. Whitten, late 

 Professor of Pomology, University of California; A. T. Potts, 

 Professor of Vegetable Gardening in the Agricultural and 

 Mechanical College of Texas; and T. J. Talbert, Superin- 

 tendent of Extension Schools, Kansas Agricultural College, 

 for reading and criticizing parts of the manuscript. George 

 P. Weldon, Pomologist of the Chaffey Junior College gave 

 valuable assistance in the preparation of the chapter on 

 insects. 



The line drawings were made specially for this book by 

 R. C. Steadman of the United States Department of Agri- 

 culture, by B. F. Williamson of New York, and by Mary 

 Mekeel, of Ithaca, N. Y. The University of California 

 allowed the use of certain material prepared by the writers 

 while they were connected with the institution, and supplied 

 photographs. Several figures were taken from School Agri- 

 culture. A. D. Shamel of the United States Department of 

 Agriculture furnished photographs; also H. S. Fawcett and 

 H. J. Quayle of the Citrus Experiment Station of Cali- 

 fornia, Porter J. Preston and L. S. Armstrong. Figures 2 

 and 25 were drawn by R. A. Hopkins, and figure 121 by 

 A. A. Brown of Ontario, California. Figures 17, 29, 39, 

 111, 117, and 118 are taken from the publications of the 

 Macmillan Company. 



MILO N. WOOD. 



CHARLES J. BOOTH. 

 September 1, 1922. 



