CHAP. V.] THRUSH, A PREVENTIVE. 519 



FRUSH, OR THRUSH. 



A running of matter at the cleft of the frog or 

 frush, was formerly called " a running frush ; " the 

 moderns, however, write it " thrush,'" But, to 

 frush, being old English for to break, to crack, or 

 crush, like the cracking of walnuts, we have preferred 

 that term before thrush. 



Cause. — Depraved habit of body and disordered 

 lungs always accompanying the appearance of a 

 frush, we have no hesitation in ascribing its origin 

 to that cause, especially as it is proved to be a 

 deep-seated morbid accumulation ; aided more im- 

 mediately, probably, by an injury received whilst 

 travelling, either by the bruise of a stone, or the 

 insertion of gravel at the parts. This latter, how-' 

 ever, is not a necessary cause of frush, though the 

 gravel and dirt work into the ulcer as soon as it 

 opens; for the lurking approach of the disease 

 towards this consummate symptom may be ascer- 

 tained by turning up the hoof and pressing the 

 cleft, which will give pain and occasion the animal 

 to flinch : inflammation has already begun at the 

 insertion of the back sinew in the bottom of the 

 coffin-bone, where the branches of the crural artery 

 also enter the bone, at the bottom whereof is the 

 sensible sole, which separates that bone from the 

 horny sole. See this structure of the foot described 

 at page 445, &c. Filthy stables promote frush, 

 and, when the cure may be nearly effected, they 

 cause relapse in nine cases out of ten. 



