Course. — Termination. 45 



Others die early from distension of the pauneh with gas. 

 In others, still, the profuse scouring helps to speedily 

 wear out the vital powers. In severe cases, that survive 

 for some time, the rapid loss of flesh is most surprising. A 

 loss of one-third of the weight in a single week is by no 

 means uncommon, and even one-half may be parted with 

 m. the same length of time in extreme cases. 



In fatal cases, with a moderately rapid course, all the 

 symptoms become more intense for several weeks, the 

 pulse becomes more and more small, weak and ac- 

 celerated and finally imperceptible, the breathing be- 

 comes rapid and difficult, the mucous membranes of the 

 mouth, eyes, etc., become pale and bloodless, emaciation 

 goes on with active strides and death ensues in from two 

 to six weeks. 



In other cases and especially in cold and dry weather 

 a portion of dead lung may remain encysted in the chest, 

 submitting to slow liquefaction and removal, and such 

 animals will go on for months doing badly, only to sink 

 at last into such a state of debility that death ensues 

 from exhaustion and weakness. 



In others, still, the retention of such diseased masses 

 and the consequent debility, determines the appearance 

 of consumption (tuberculosis), which cuts off the animal. 



Purulent infection and rupture of abscesses into the 

 chest are other causes of death in this disease, but 

 neither of these has so far come under my notice. 



In cases about to recover, the symptoms gradually sub- 

 side, life and appetite are re-acquired, and a more or less 

 rapid recovery takes place. In the most favorable the 

 exudations are slowly re-absorbed and the lung may be 

 restored to its natural state. In others, the exudation, 

 which is mostly in the interlobular tissue, becomes in 

 part organized into fibrous material which, in contract- 

 mg, compresses the lobules of lung tissue, lessening their 

 capacity for dilation, and leaving the animal short-wind- 

 ed and predisposed to emphysema and other lunjf 



