PREFACE 



The literature bearing on diseases of hogs is verj' 

 scattering, and it is believed that a short treatise on 

 this subject will be of use to stockmen and veterina- 

 rians. There is a special need for a work of this kind 

 — made known by the many inquiries received by the 

 veterinarians from the swine breeders over the coun- 

 try, and in other ways. Not long ago the Purdee 

 University Agricultural Experiment Station issued 

 a bulletin on swine diseases that proved one of 

 the most popular bulletins ever issued by this Station. 



In no other class of farm animals is so little atten- 

 tion given the preventive measures of disease, and, as 

 a result, the per cent, of loss is about twice as great 

 as it is in other species. . In discussing the different 

 diseases, the causes and preventive measures are given 

 special attention by the writer. , 



There is a certain class of readers that believe it 

 unnecessary to learn the correct name of a disease, or 

 use the correct term in speaking of a diseased proc- 

 ess. However, such technical terms have come into 

 more general use during the last few years, and the 

 average reader is familiar with the ones commonly 

 used. In the different discussions the use of tech- 

 nical terms is avoided as far as deemed best, and an 

 effort is made to avoid complicated and long discus- 

 sions because of the difficulty in understanding them. 



R. A. Craig. 

 Purdue University, 



March 31, lgo6. 



