COLDS. 199 



or difficulty of breathing, according to the 

 severity of attack, from the proportion of 

 perspirable matter repelled (become morbid), 

 and compulsively absorbed into the circu- 

 lation. So soon as the horse is in this state 

 a symptomatic fever attends, which is to be 

 understood no more than a degree of febrile 

 heat, or irritability dependent on the ori- 

 ginal cause, which gradually ceases as the 

 primary disease is found to decline. 



The blood in all these instances becomes 

 languid and enfeebled by its increase and in- 

 cumbrance, whilst its velocity is pieternatu- 

 rally compelled in the structure of the vessels, 

 upon their over-accumulated contents, which 

 palpably constitute the obstruction and pro- 

 duce the fever. Having traced the very 

 principle of colds to their original cause, 

 and pointed out their difterent effects upon 

 the eyes, glands, lungs, and circulation, I shall 

 proceed first to that kind of cold fixed on the 

 lungs, distinguished by COUGH, and its 

 consequences, enlarging upon the other two, 

 when we come to treat on their separate 

 classes, under the disorders of the eyes and 

 strangles, or tumours upon the glands. I 

 shall therefore take this complaint in its first 



