PREFACE TO FIRST EDITION. 



During the past eight years there has been added to the 

 curriculum in most of our agricultural colleges a new course 

 dealing with the types of farm animals, market demands, and 

 market classes of live stock. More properly speaking, it has 

 been inserted at the very beginning of the work in animal hus- 

 bandry, forming, as it logically does, the foundation course in 

 the study of that important branch of agriculture. This is a 

 soundly practical study; the student is brought to a much clearer 

 conception of values and a much better appreciation of live 

 stock than was possible under the former system of teaching. 



Recognizing the need of a text on this subject which could 

 be placed in the hands of students, the writer prepared and 

 printed a loose-leaf edition which has been used at Ohio State 

 University during the past three years. This met with favor- 

 able comment, and requests have been made that the material 

 be put into book form. After careful revision and the addition 

 of a number of illustrations, this is now attempted in the hope 

 that students and teachers and the general reader as well may 

 find such a book useful. 



The arrangement of the subject-matter corresponds to 

 the order usually followed in teaching, but may be varied as 

 desired, each section of the book Cattle, Sheep, Hogs, and 

 Horses being complete in itself. 



The writer desires to express his indebtedness to numer- 

 ous commission men, buyers for the packing houses, and others 

 who have kindly given their assistance during his quests for 

 information, and to numerous experiment station publications, 

 particularly the series of excellent bulletins issued by the Illi- 

 nois Station setting forth the results of their studies of the 

 Chicago and St. Louis markets. Acknowledgment of valued 

 assistance is due my present co-workers, and also Professors 

 C. S. Plumb and F. R. Marshall at Ohio State University. 



Iowa State College, H. W. VAUGHAN. 



July, 1915, 



