Authors' Preface to the Third 

 German Edition 



Hardly two years have passed since the publication of the 

 second edition of this work, which was accorded a very favor- 

 able reception by veterinarians. While the arrangement of the 

 earlier editions as well as the former division of labor (Infec- 

 tious diseases written by liutyra, Organic diseases by Marek, 

 each working independently) is maintained it again became 

 necessary in this latest edition to add a few new chapters, to 

 supplement the text and even to rewrite it in some portions, 

 in order to do proper justice to the results of the most recent 

 investigations in the field of internal veterinary medicine and 

 of comparative patholog}^ 



The continued and active investigations in immunology pro- 

 duce always new scientific facts and views which are of great 

 importance to the practitioner. This is particularly true of the 

 allergic reactions, of the sero-diagnostic methods, and of the 

 development of methods for protective immunization as Avell as 

 their practical valuation and application ; all these subjects have 

 been considered more especially in the chapters on tuberculosis, 

 glanders, infectious abortion, and swine plague. 



The section on protozoal diseases was carefully rewritten. 

 Aside from their great economic importance for tropical coun- 

 tries, these diseases may claim a general interest, owing to the 

 splendid results of chemotherapy, because they permit a very 

 promising outlook for the future treatment of other diseases 

 as well, and lead our therapeutic endeavor into new paths. 



Aside from a few diseases of minor importance (Malta 

 fever, Three Days' Disease, etc.) some more important diseases 

 were included, viz.. Leukemia of chickens, Dochmiasis and Oeso- 

 phagostomiasis. Enzootic Cretinism in animals, Serum diseases 

 and Necrobacillosis ; the chapters on Hemorrhagic Septicemia 



