PREFACE v 



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

 Industry, and "PL 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. 



PREFACE TO THIRD EDITION 



THE chapter on Cotton was added in the second edition. 

 The third edition included a number of changes in the Appen- 

 dix tables to bring the matter up to date. Suggestions to 

 Teachers for additional exercises and projects have been 

 added to the Appendix. Changes and many additions have 

 been made through the text, and the present Chapters 

 XVI and XXXI have been added. 



NASHVILLE, TENN., 

 July, 1917. 



