PREFACE 



The activitj' in the study of the infectious diseases of ani- 

 mals has brought out many new facts pertaining to them since 

 the publication of the second edition of this volume. This 

 rapid increase of new knowledge and the elimination of pre- 

 viously employed methods and interpretations render thepr e- 

 paration of a text-book suitable for student use more and 

 more difficult. 



In the present revision, the general plan of the arrange- 

 ment of subject matter and the classification of the diseases 

 followed in the previous editions have not been changed. The 

 grouping of the infectious diseases in accordance with the clas- 

 sification of their etiological factors is for student purposes at 

 least proving to be satisfactory. The rapid accumulation of 

 literature on the subject matter of this elementary work pre- 

 cludes the publication of a bibliography. The appending of a 

 few references after the discussion of each disease to some of 

 the more important articles has, however, proven to be of 

 much assistance to students just beginning the study of in- 

 fectious diseases. 



I desire to express my appreciation of the kind reception 

 accorded to the second edition and the helpful reviews and 

 criticisms that it has received. It is hoped that this edition 

 will be of still greater aid both to the student and practitioner 

 than the former ones. My thanks are especially due to Drs. 

 S. H. Burnett and W. J. Taylor of this department for helpful 

 suggestions and for assistance in readi*^^ proof. 



V A. M. 



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