PKEFACE. 



The need of an up-to-date, scientific text designed for 

 student use has been long felt by teachers of the internal 

 diseases of animals. The author has personally experienced 

 this need as a teacher of veterinary students for over twenty 

 years. The few books available on the subject are either 

 obsolete or so filled with errors that they mislead rather than 

 instruct. Some of the best of them are translations from the 

 German and French. In too many instances the translators 

 have been neither veterinarians nor teachers of veterinary 

 medicine, and too few of them linguists. Furthermore, the 

 books in this field have not been designed for undergraduate 

 students; they are bulky, comprehensive works of reference 

 of little pedagogic value; all of them have been superseded 

 by newer editions in the original tongue. 



Although this volume is designed primarily for the student, 

 it will be found valuable to the practitioner, investigator or 

 intelligent stockman wha may have need of knowledge of 

 the fundamental principles of the practice of veterinary 

 medicine presented in concise, clear-cut and at the same time 

 not too dogmatie form. 



While the author has many to thank for assistance in 

 preparing this volume, among his fellow teachers, investi- 

 gators and practitioners, he is especially indebted to Professor 

 D. H. Udall, of the New York State Veterinary College, 

 Cornell University, who kindly read the manuscript and 

 offered many valuable suggestions from his rich experience, 

 practically all of which have been incorporated in the book. 

 Messrs. Lea & Febiger are also thanked for their patience, 

 courtesy and efficient service in making the edition mechanic- 

 ally good. D. S. W. 



Columbus, Ohio, 1917. 



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