94 DISEASES OF THE HOG. 
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 are 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 weatker, especially cold east. winds and rain. 
Some pigs are nuch more susceptible to colds than 
