262 
FROG PRESSURE SHOE. 
to effect this a bar of iron, in the shape of the frog, is rivetted to a 
leather sole; and to vary the degree of pressure, any number of piles 
of leather, of the same shape, may be placed between the bar and 
the sole, and between the sole and the frog. In the shoe sent you, 
there is one pile under the leather sole, and one between the sole 
and the frog-bar, which bring it perfectly level with the undersur¬ 
face of the shoe, and give equal bearing to the crust and the 
frog; but as I said before, the adding to or diminishing the 
number of the piles of leather will enable us to vary this degree 
of pressure to any extent. 
It is a form of shoe, too, which may be adopted under ordinary 
circumstances : it is not necessary that the animal should be at 
rest during its use, nor is it one that requires a continuous atten¬ 
tion on the part of the veterinary practitioner; the proper adap¬ 
tation of it in the first instance, and the careful attention to 
symptoms on its removal, being all that is requisite on his part. 
As in adopting this shoe, it becomes absolutely necessary to 
employ a leather sole, I beg leave to offer a remark or too on the 
use of it. I am clearly of opinion, that there are no cir¬ 
cumstances under which it becomes necessary to give pressure to 
the frog by artificial means in which the use of the leather sole, 
properly applied, will be prejudicial. Of course, it is necessary 
that the sole and frog be first well covered with tar, and as much 
tow applied as will perfectly prevent the possibility of small stones 
or gravel getting between the leather and the horny sole ; and I 
am sure all w ho have been in the habit of using soles, will bear 
me out in asserting, that there is no system of stable management 
under which the sole will be more beautifully elastic, on the 
removal of the shoe, than under this treatment. There is less 
concussion also, by the circumstance of leather being interposed 
between the iron shoe and the foot, and no bruising of the sole 
or frog by loose stones on the road. I would just add, that it is 
necessary that the shoe should be fitted out larger than if it were 
to be applied to the bare foot, by just so much as the thickness 
of the leather will add to the base of the foot. I do not mention 
this for the information of veterinary surgeons, but simply to 
remind them, that as many of them have repeated occasions to 
give instructions to various smiths, it is equally needful to give 
them plain directions on these heads. 
I do not think it at all requisite now to enter into a dissertation 
on the particular cases which require frog-pressure: I have as¬ 
sumed that there are many occurring in the practice of every 
veterinarian, and I offer this invention to their notice with the 
greatest good feeling, not ever expecting that it will entirely 
supersede the practice adopted for the same end by others, but 
