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MANUAL OF MODERN FARRIERY. 
produce the desired effect, if, besides, a firm and uniform 
pressure is applied, and nothing moist permitted to rest 
upon the surface, which would be sure to be attended with 
very serious consequences. In this complaint gentle exercise 
is absolutely necessary where the disease is confined to the 
frog and sole of the foot, but moisture is carefully to be 
avoided. But it will be found that in effecting a cure the 
processes will be both tedious and painful, in consequence 
of the necessity of caustic applications, which, however 
slight, always cause considerable irritation in the parts. To 
relieve the animal as much as possible from unnecessary 
suffering, the nerve of the leg should be divided, which will 
stop the sense of pain. But after this is done, care must 
be taken not to expose him to severe hard work, or even 
contact with hard substances, as from the sense of feeling 
in the foot being so far blunted, he may batter the hoof to 
pieces without knowing it, and also bruise the cankered 
parts. 
In this complaint medicine is seldom had recourse to, 
as it is of little use, the disease being local. But it some¬ 
times occurs that grease follows canker; in the event of 
which physic will become necessary, and these will be 
alteratives and diuretics. 
THRUSH. 
Thrush is a disease to which horses of all ages are liable, 
and in all situations. Even unshod colts are subject to 
this complaint, caused by the horny frog being subjected to 
pressure by the contraction of the quarters, which is thereby 
diminished in size ; and the lower portion of the fleshy frog 
being confined, is irritated and inflamed, which induces 
ulceration, and when matured is manifested by matter being 
discharged from the cleft of the frog. During this state of 
