106 DISEASES OF THE HOG. 
ly pus. In cases where the animal has died from 
an accumulation of mucus in the tubes the lungs 
refuse to collapse upon the admission of air into 
the pleural cavities. Under the microscope the 
surface of the membrane may sometimes be seen 
deprived of its epithelium and the fibrous layer 
covered with a fibrous exudation in its place. The 
substance of thelungs ismore or less affected, often 
they are congested in patches, sometimes there will 
be small abscesses filled with pus bearing a resem- 
blance to tubercles when cut into; these are lined 
with false membrane and communicate with the 
bronchial tubes. Chronic bronchitis is not a usual 
result of the acute in animals; but if a cough with 
more or less discharge of mucus should remain 
after all acute symptoms have passed it may be 
called chronic and is best treated by tonics and 
stimulants, such as iron, quinine and whisky, or 
from five to eight drops of Fowler’s solution of 
arsenic, three times a day in food. A very good 
one is ten grains of sulphate of copper in the food 
three times a day. Two drams of tar in the food . 
twice a day I have found very effectual. 
CONGESTION OF THE LUNGS. 
This is a common disease in the pig, and consists 
of engorgement of the vessels of the lungs with 
blood and a detention of it in the capillaries caus- 
ing what is known as pulmonary apoplexy. This 
state of engorgement is recognized as acute, pas- 
sive and mechanical. The former is the one which 
we most frequently encounter and is readily recog- 
