114 PLETJBISY, PHEUMONTA, <feo. 



Pleurisy, Pneumonia, Pleuro-Pneu- 

 monia, Inflammation of the Chest. 



The pleura is the delicate serous membrane, 

 covering the lungs with one surface, and lining the 

 cavity of the chest with the other. Systematic 

 writers treat of the inflammation of this membrane, 

 Pleurisy, and that of the substance of the lungs, 

 Pneumonia, separately. But as this rarely occurs in 

 fact, and leads to no practical result in the treat- 

 ment, and indeed can be rarely detected before 

 death, I prefer the irore practical course of treating 

 them together. An inflammation of the lungs rarely 

 or never remains so, but eventually involves the 

 pleura more or less, and so an inflammation of the 

 pleura always involves more or less extensively, the 

 pulmonary substance. The best name, and more com- 

 mon type of the disease, is hence PLEURO-PNEUM- 

 ONIA. 



CAUSES. Catarrh Influenza, Cold, or bronchial 

 irritation may either of them terminate in this disease 

 if neglected, or from fresh exposure. A sudden 

 transition from heat to cold ; change from a warm 

 stable to a colder one ; neglect of the usual blan- 

 keting, or even of other comforts ; hard and long 

 riding against a cold wind in snowy weather ; loiter- 

 ing in an exposed, bleak place, when the horse is 

 fatigued and warm, without covering. It sometimes 

 occurs when horses are suddenly turned out to grass, 

 or when they have been taken up and turned into a 



