iv PREFACE. 
the writer a lack of sufficient accurate scientific data for their profit- 
able discussion. Moreover, many principles which are already 
familiar have been considered rather cursorily in order to allow a 
more full treatment of less well-known aspects of the subject, even 
at the expense of literary proportion. 
The substance of this volume was given in the form of lectures 
before the Graduate Summer School of Agriculture at the Ohio 
State University in 1902, and has been prepared for publication at 
the request of instructors and students of that school. In thus 
presenting it to a somewhat larger public the author ventures to 
hope that it may tend in some degree to promote the rational study 
of stock-feeding and to aid and stimulate systematic investigation 
into both its principles and practice. 
State Coiuecs, Pa., November, 1902. 
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