94 DISEASEJS OF THE HOCJ. 



CHAPTER IX. 



DISEASES OF THE RESPIRATORY ORGANS. 



Inflammation may occupy a distinct portion of 

 the respiratory passages and terminate where it 

 began, or it may affect several portions succes- 

 sively or all at the same time, forming one continu- 

 ous disease. It will be more convenient to consider 

 each set separately. The pig is a very bad subject 

 to examine as it is impossible to keep it quiet, and 

 if we try to do so we excite the animal so much that 

 both the respiration and the circulation ure much 

 increased in frequency, therefore we cannot get 

 much aid in this line. 



INFLAMMATION OF THE NOSTRILS OR CORYZA. 



The same mucous membrane lines the nostrils 

 and the sinuses of the head and face and these parts 

 are all liable to become inflamed at the same time, 

 constituting what is called a cold in the head, and 

 very often the membrane of the eyelids will be 

 affected at the same time through sympathy. 



Causes. — The most frequent exciting cause is ex- 

 posure to cold such as lying in cold, damp places in 

 cold weather, especially cold east winds and rain. 

 Some pigs are much more susceptible to colds than 



