PREFACE V 



are marked under illustrations : "An. I." for Animal 

 Industry, and ''PI. I." for Plant Industry. Credits are 

 given with the name of the station to those furnished by 

 State Experiment Stations: ''Kans./' ''W. Va.," ''Wis.," 

 "N. J.," "Minn.,'' "Maine," "Cornell." Professors Harry 

 R. Lewis and Maurice A. Blake kindly supplied a number 

 of photographs; animal photographs were also given by F. 

 Warren Sumner, of Elizabeth, N. J., the White Wyandotte 

 Hen; Thos. Wyckoff, Orchard Lake, Mich., the Rambouillet 

 Ram; Cornell Countryman, the Dorsets; Chas. Leet, Mantua, 

 Ohio, Southdown Ewe; R. C. Parsons, Grand Ledge, Mich., 

 Oxford Ram; A. T. Gamber, Wakeman, O., American Merino. 

 Cuts have been loaned by the author and the J. B. Lippin- 

 cott Co. from John B. Smith's "Insect Friends and Ene- 

 mies," and "Economic Entomology." 



The author will be glad to receive suggestions and cor- 

 rections from teachers and others regarding any mistakes 

 in the book. 



