604 PLEUKO-PNEUMOXIA. 



has a dainty appetite, or refuses all nourishment. It has a 

 discharge from the eyes, and a foetid sanious discharge from 

 the nose. Not unfrequently it coughs up disorganized lung- 

 tissue and putrid pus. Great prostration, and indeed ty- 

 phous symptoms set in. There is a foetid diarrhoea, and the 

 animal sinks in the most emaciated state, often dying from 

 suffocation, in consequence of the complete destruction of the 

 respiratory structures. 



Post-mortem appearances. In acute cases the cadaveric 

 lesions chiefly consist in abundant false membranes in the 

 trachea, and closure of the bronchial tubes by plastic lymph. 

 The air-vesicles are completely plugged by this material, and 

 very interesting specimens may be obtained by careful dis- 

 section, in the shape of casts of the bronchial tubes and air- 

 vesicles, clustered together like bunches of grapes. On slic- 

 ing the lungs in these cases, hepatization is observed, pre- 

 senting a very peculiar appearance, which is in a great 

 measure due to the arrangement of the lung-tissue in cattle. 

 The pulmonary lobules are a deep red or brown colour, per- 

 fectly consolidated, and intersected or separated one from the 

 other by lighter streaks of % reddish-yellow lymph, occupying 

 the interlobular areolar tissue. In the more chronic cases 

 the diseased lobes and lobules are found partly separated 

 from the more healthy structures. This occurs from gangrene 

 and putrefactive changes, or in some instances from the ul- 

 cerative process so constantly observed in the segregation of 

 dead from living tissues. Abscesses are not unfrequently 

 found in different parts of the lungs, sometimes circumscribed, 

 at others connected with bronchial tubes, and not unfre- 

 quently communicating with the pleural cavity. True ein- 

 pyema is not often seen, but at all times the adhesions 

 between the costal and visceral pleura are extensive, and 

 there is much effusion in the chest. In dressed carcases of 



