112 Disease.^ of the hoo. 



somewhat resembles the liver; on this account it is 

 termed hepatized. When pressed between the 

 fingers a reddish fluid will ooze out The cut sur- 

 face of the lung exhibits numberless minute gran- 

 ules which are probably the air cells filled with a 

 concrete fibrous exudation. In red hepatization 

 the bronchial tubes, the blood vessels, and the in- 

 terlobular areolar tissue are still obvious to exam- 

 ination. The lungs do not collapse upon exposure 

 to the atmosphere, as they do in health. In the 

 third stage there are two conditions, namely gray 

 hepatization and the other abscess. In the former 

 the lung is compact and of a gray color, both ex- 

 ternally and internally, and when cut into a yellow- 

 ish opaque purulent fluid mixed w^ith blood is seen. 

 It is much softer than red hepatization and if lifted 

 will likely fall to pieces. In the abscess stage the 

 lung may be a mass of abscesses or single ones. I 

 have seen cases in which one of the lungs was a 

 mass of matter held in by the membrane covering 

 the lung. If the hepatization is extensive the ani- 

 mal usually dies before it has time to break down 

 into pus, but if only one lung is affected the animal 

 may live long enough for it to do so. Gangrene is 

 not a common result of pneumonia in ordinary 

 cases, but I have often found the lungs in this con- 

 dition in pigs that died from hog cholera or swine 

 phigue. 



Treatment: In no disease is it more important 

 to make a proper discrimination in the treatment. 

 The measures which would be beneficial in one case 

 might cause a fatal termination in another. Aui- 



