110 PLETTBISY, PJTETTMONIA, <feo. 



becomes quicker and more painful and catching. 

 when the air is drawn into the lungs. Then by de- 

 grees, no catch is seen or grunt heard, the twitches 

 are not observed, cold clammy sweats break out 

 over the body, the horse appears dull and stupid, 

 and death closes the scene. 



The pleura, like all serous membranes, has a 

 strong tendency to effusion, or exudation of fluid, 

 during an inflammatory action and in the course of 

 the disease this effusion, consisting of yellowish 

 serum, is exuded, in quantities varying from a few 

 ounces to a bucket-full. It occurs in all severe 

 -ases, and the fluid either is again absorbed, if in 

 small quantity, or is the immediate cause of death, if 

 in very large quantity, or a lesser amount may re- 

 main for a long time, impeding respiration, and form- 

 ing an empyetna or dropsy of the chest. When it 

 exists, the breathing is always labored, and there is 

 oedema or tumid swelling of some external part, gen- 

 erally the abdomen, chest, or point of the breast. 



By listening with the ear against the chest, the pro- 

 gress of the effusion may be traced from* below up- 

 ward. Above it, will be heard the loud crackling 

 respiration and grating peculiar to the disease; below, 

 the dullness and stillness of the lung enveloped in 

 fluid, the absence of sound, marks the line of the ac- 

 cumulated fluid its increase and diminution. 



IN PNEUMONIA, the symptoms differ from Pleurisy, 

 yet the difference manifests itself in this, that in 

 Pleurisy there is more pain, and in Pneumonia more 



