INTRODUCTION. 11 



ence, which has led to a more successful treatment of the 

 diseases of domestic animals. 



The author acknowledges his obligations to various sources 

 for this work. The authors named in the title page have 

 been consulted and freely employed ; the most valuable assist- 

 ance has been derived from the teachings and works of the 

 professors of the P. M. College of Ohio. 



G. H. D. 



