100 DISEASES OF THE LUNGS. 



cipate in the inflammation — which is more generally the 

 case — then some such symptoms as characterise bronchitis 

 will arise, and the seat of disease no longer remain question- 

 able. Supposing inflammation to have attacked the paren- 

 chyma alone, the bronchial blood-vessels may be regarded as 

 those principally carrying on the disease ; but there may, and 

 often does, take place prior to inflammation, and sometimes 

 without any consecutive inflammation, and especially after 

 over-exertion, a congested condition of the large blood-vessels 

 (the pulmonary) of the lungs : a case of which kind will show 

 other symptoms, and require a nwdified treatment, from one 

 of actual inflammation. 



Division. — This difference in the pathology leads to the 

 division of pneumonia into the congestive and inflammatoy'y 

 forms or stages. The latter admits of further division into 

 simple and complicated, depending on the accompaniments — 

 both of which are common — of bronchitis and pleurisy; the 

 one case going by the name of br one! lo -pneumonia, the other 

 by that oi pleuro -pneumonia, A still further division of inflam- 

 matory pneumonia is required into acute and sub-acute; though 

 these, of course^ have reference but to degrees of intensity. 



The symptoms of congestive pneumonia may supervene 

 all at once, upon any act of sudden or violent exertion, or they 

 may come on gradually. In the one case, the horse, in 

 perfect health before, being put to some violent effort — what- 

 ever it may be, whether hunting, or racing, or over- fatigue 

 of any kind — is now distressed for breath to that degree 

 that it is evident, unless speedily relieved, he must die. In 

 the worst cases of this description, the animal is all over in 

 a tremor : a cold sweat bedews his body ; there is no pulse 

 to be felt ; his extreme parts betray the coldness of death ; 

 his eye is frightfully wild with its pupil dilated, and, together 

 with the boring of head and stupidity evinced by him, clearly 

 denote the poor suffferer to be labouring under a species of 

 delirium. Should this state of congestion come on in the 

 stable, i.e. gradually, and some time after the cause is applied, 

 the horse will shew it by at first appearing dull, and listless, 

 and heavy-headed, and off* his appetite ; his respiration will 



