PREFACE 
The purpose of the Fourth Edition of this book is to provide 
students and practitioners with a text that will give them information 
on the etiology and morbid anatomy of the specific infectious diseases 
of animals and the methods available for their diagnosis. It is 
possible, within the limits of a workable text book, to include but a 
small part of the available knowledge on each of these diseases. To 
supplement the necessarily brief account, a list of the more important 
publications is appended to the description of each. It is believed 
that these references will give the key to the literature thereby 
making it possible for the student to familiarize himself with the 
present knowledge of the subject. 
The sanitary significance and the economic importance of the 
infectious diseases of animals are calling for a better understanding 
of their nature and more efficient methods for their control. These 
will be attained only through a more definite and specific knowledge 
of the etiology and morbid anatomy of each of these maladies. 
This edition has been carefully revised, much of it rewritten and 
numerous additions made. It has been kept, however, within the 
limits of a text book. Two appendices have been added, one on the 
requirements for interstate shipment of live stock and the other on 
the Federal regulations for the veterinary inspection of meat. These 
may be of much assistance to veterinarians. The diseases not 
indigenous to, or imported into, this country have been accorded 
much less space than those existing here. The desire is to emphasize 
the nature of the diseases our veterinarians are liable to encounter 
and, at the same time, give the characteristics of the others. The 
same plan of presenting the subject and of grouping the diseases 
according to their etiology that was followed in the previous editions 
has been retained in this. 
J desire to express my appreciation of the kind reception accorded 
the third edition, and for the helpful suggestions received from its 
readers. It is hoped that this edition will be still more useful to the 
student and practitioner. My thanks are especially due to Dr. C. P. 
Fitch for making several of the photographs particularly those of 
glanders, reproduced in the the text. 
V. A.M. 
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