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526 ON GREASE. 



" opinion is here fanftioncd by Dr. Darwin) 

 *' the column of blood preffing on the origins 

 of the veins of the lower extremities, when 

 the body is ereft, oppofes the afcent of the 

 blood in them ; they are more frequently 

 liable to become enlarged, and to produce 

 varices, or vibices, or, laftly, ulcers about the 

 legs, than on the upper parts of the body.'* 

 That fuch is the caufe, appears from the well 

 known circumftance of the horfe being free 

 from greafe abroad, where he conflantly walks 

 about to obtain his food, or ftretches himfelf 

 upon the ground at his eafe. The difcharge 

 being greafy, appears to be peculiar to the 

 horfe, as I have before noted in raolten-greafe ; 

 that it is fo fetid in this cafe, is not to be attribut- 

 ed to any original foulnefs and malignancy, as our 

 srooms commonly fuppofe, but to the fubfe. 

 quent caufe of the humour being lodged out of 

 the verge of circulation, where it in courfe foon 

 corrupts. 



1 have defcribed the diforder as it may fpeed- 

 ily happen to a horfe in the beft condition of 

 body, under the hands of a bad groom, the 

 animal (landing as a mere fixture faftened by 

 the head in his ftall, without exercife, his legs 

 heated and fretted into cracks with dirt ; but 

 the greafe may be complicated with, or occa- 

 fioned by an impure flate of the humours, by 

 laxity and weaknefs of the veflels, and a ferous 



and 



