viii PREFACE 



the discussion pertaining to sheep breeding, and to my assistants, 

 Mr. Claude Harper and Mr. E. K. Augustus, who have rendered me 

 most valuable assistance in various ways. I also wish to express my 

 very great appreciation of suggestions given by Miss Anna Cushman 

 Glover, Secretary of the Illinois Agricultural Experiment Station, 

 and by my brother, Professor J. S. Coffey, on the arrangement of 

 the material for this book. 



WALTER C. COFFEY. 



August, 1918. 



