296 PURGATION. 



from blows, where extravafation, or burfling of 

 the fluids from their veflels, has taken place. 

 Bracken has queftioned their good effe6ts on 

 lean and hide-bound horfes, and in the greafe ; 

 but experience is furely againfl him in the lat- 

 ter cafe, fince rowels have ufually the effeft of 

 flopping, at leafl: diminifhing, the greafy dif- 

 charge in the legs ; and hide-bound and un- 

 thrifty horfes are often fuddenly amended by 

 the ufe of this drain, for which, confidering 

 their emaciated appearance, it feems difficult 

 to affign a reafon. It is fcarcely worth while to 

 defcribe the operation of making a rowel, it is 

 a thing of fuch common ufe ; and every farrier 

 who has made one, in courfe, fuppofes he has 

 opened a door for the exit of foul humours 

 exclufively, reafoning in that flraight forward 

 way, that it is a pity fiiould ever deceive a 

 man, to wit, that a difcharge offuch ill favour, 

 mufl: needs be of a malignant nature. 



Confidering the laws of circulation, I can 

 fcarcely make up my mind, as to the utility of 

 placing rowels in proximity to the part affe61- 

 ed, or whether they can poiTibly have the 

 effeft of emptying the circumjacent vcffels, 

 any otherwife than by the gradual and cir- 

 cuitous mode of revuHion ; neverthelefs I think 

 a near fituation ought ever to be preferred 

 where prafticable. The parts proper for their 

 infertionj are the cheil, ijioulders, belly, hips, 



infide 



