PREFACE TO THE SECOND EDITION. 



An endeavor has been made in this edition to incorporate 

 in the text the most important contributions to veterinary 

 medicine made during the past three years. To this end 

 some of the chapters^er^ewritten, and all of them revised 

 and brought up to dat^ ''^e book has been enlarged to 

 the extent of fifty pages. iS}. ^^ 



The reception of the firsr^i^n was very gratifying. 

 Only a few months after its appeSmii^ all copies of the book 

 had been sold. Most of the vete'Jig^y and many of the 

 agricultural schools have adopted it ^^a, test-book. 



For suggestions and constructive criticisms in preparing 

 this edition the author has many to thank. He is especially 

 indebted to Miss Mabel E. Moran for reading the proof 

 sheets and preparing the index. 



D. S. W. 

 Columbus, Ohio, 1920. 



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