AUTHORS' ACKNOWLEDGMENTS 



Acknowledgment is gratefully made to the Minister of 

 Agriculture, Canada, for the illustration on page 209; the 

 United States Department of Agriculture for the illustra- 

 tions on pages 17, 40, 65, 68, 75, 77, 82, 85, 93, 105, 120, 125, 

 129, 147, 149, 151, 1 86, 189, 193, 194, 196, 198, 209, 213, 

 273, 278, 280, 284, 286, 298, 299, 303, 309, 317, 318, 321, 

 325, 328, 350, 352, 353, 355, 362, 364, 369, 397 ; the Poultry 

 Department of the Massachusetts College of Agriculture, 

 pages 357, 364, 366 ; the Kansas State College of Agriculture, 

 pages 42, 45 ; the Alabama Polytechnic Institute, page 173 ; 

 the Washington State College of Agriculture, page 339 ; the 

 Iowa State College of Agriculture and Mechanic Arts, pages 

 15/19, 28, 55, 123, 139, 243; the College of Agriculture of 

 the Illinois State University, pages 233, 239, 320, 323 ; the 

 College of Agriculture of the University of Wisconsin, 

 pages 187, 190, 192, 195, 199; the College of Agriculture of 

 the State University of Minnesota, pages 348, 372 ; the Col- 

 -lege of Agriculture of the University of Ohio, page 129; 

 the Yakima Commercial Club of the State of Washington, 

 pages 155, 182, 269, 338; the Crop Improvements Commit- 

 tee, Board of Trade Building, Chicago, page 39 ; Wallace's 

 Farmer, Des Moines, Iowa, page 393 ; the Agricultural De- 

 partment of the International Harvester Company of Chi- 

 cago, pages 51, 68, 89, 135, 137, 142, 144, 157; the James 

 Manufacturing Company, Fort Atkinson, Wisconsin, pages 

 239, 246, 411; the DeLaval Separator Company of New 

 York City, page 383 ; the Lehigh Portland Cement Com- 

 pany, of Chicago, page 430; the Northern Pacific Railway, 

 page 341 ; the Hoosier Manufacturing Company, New 

 Castle, Indiana, page 380, and the David McKay Publish- 

 ers, Washington Square, Philadelphia, Pa., pages 413, 414, 



