OF FARRIERY. 



219 



perature, whether the change be from a 

 warmer to a colder medium ; or otlierwise, 

 from a colder to a warmer; that it is very 

 seldom a Horse is brought from a dealer's 

 stables, who does not, in a day or two, exhibit 

 some cough. When a Horse is removed from 

 a cold temperature into a hot one, it is evident 

 that the hot medium is immediately applied 

 to the seat of inflammation ; and as liot air 

 must tend to accelerate the circulation, there- 

 fore it is not difl^cult to account why it can 

 produce the disease, and this more certainly if 

 the heated air be less pure than that which 

 trie animal was removed from ; when on the 

 contrary the removal takes place from a 

 warm to a colder situation, a similar effect 

 perhaps also takes place ; the cold air is ira- 

 aiediately applied to the lungs, which may by 

 jts sedative properties, particularly if the 

 change he very great, by this means be sud- 

 denly weakened. But it is not only by appli- 

 cation to the immediate cellular substance of 

 the lungs, through the medium of respiration, 

 that cold acts injuriously on them. It more 

 often exerts its baneful influence through the 

 medium of the skin, with which these organs 

 are united by a sympathetic and peculiar 

 union, and which is liable to be at all times 

 exposed to the vicissitudes of temperature ; 

 for both skin and lungs appear emunctores 

 of the foecal parts of the blood, and hence the 

 sympathy between them is observed to be 

 very great ; and any thing that may prevent 

 ^he exit of this foecal matter, called perspira- 

 tion, from the vessels of the skin, will throw 

 much more of it on the lungs. When, there- 

 fore, in addition to these occasional causes, we 

 consider that the lungs are very large, as well 

 as very important organs ; and that in an 

 antmal of speed they are peculiarly extensive 



in their surfaces, and extremely vascuiar in 

 their structure, we shall be at no loss to ac- 

 count for their tendency to inflammation. 



This tendency also seems much heightened 

 in common with the proneness to other dis- 

 eases, by a life of art ; for in a state of nature, 

 or one nearly approaching to it, they are seldom 

 attacked. The cows even experience this in- 

 creased tendency, arising from artificial babits, 

 as is observed in those kept near London, and 

 other great cities, where they are more arti- 

 ficially supported, and subjected to occasional 

 housing. 



The Cure of Injf animation of the Lungs: 

 — The principal indications of cure are two ; 

 first, to lessen the increased vascularity or 

 distension of the lungs, by bleeding; and 

 next, to endeavour, by external stimulants, to 

 change the diseased action ; that is, by rais- 

 ing an external inflammation, we may hope to 

 lessen the internal one ; and it must be re- 

 marked, that as this disease is obstinate and 

 quickly fatal, so the treatment must be active 

 and immediate. The cure should therefore 

 be promptly begun by bleeding, according to 

 the age, size, and strength of the animal ; 

 regard also being paid to the time the disease 

 has existed ; for, when the treatment is com- 

 menced too late in the complaint, the bleeding 

 cannot be carried to the extent that it may be 

 in the early stage. As a general rule, it 

 should be remembered, that bleeding in in- 

 flammation of the lungs, is never to be con- 

 tinued longer than it raises the pulse ; that is 

 supposing it to be previously in an oppressed 

 state, which, in true pneumonia it usually is; 

 and in every variety it is quick, and without 

 fulness, even though somewhat hardened. 

 More good is also gained by one bleeding- 

 within the first twenty-four hours of the com- 



