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 microiscope 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 the lungs is more 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- 



