vi PREFACE 



aim of the author to give a well-digested, systematic treatment of 

 the subject. It is hoped that the presentation will commend itself 

 to the judgment of educators and farmers, and that a study of this 

 book will aid them to a clear understanding of the principles of 

 productive feeding of farm animals. 



Acknowledgment for loan of photographs or cuts is due to the 

 Directors of the Agricultural Experiment Stations at Berkeley, Cal. ; 

 Ottawa, Canada ; Ithaca, N. Y. ; State College, Pa. ; Burlington, Vt. ; 

 Madison, Wis., and U. S. Bureau of Animal Industry; Professors 

 K. C. Davis, S. B. Doten, David Griffiths, I. D. Iddings, Frank L. 

 Peterson, E. A. Trowbridge, and Gordon H. True; American Guern- 

 sey Cattle Club ; W. J. Gillett, Rosendale, Wis. ; A. W. Morris & Sons 

 Corp., Woodland, Cal.; Publishers Breeders' Gazette, Chicago, and 

 Pacific Enrol Press, San Francisco, Cal., and Hog Motor Company, 

 Minneapolis. 



F. W. WOLL. 

 DAVIS, Cal., January, 1915. 



