140 REMARKS ON MR. REEVE'S EXPERIMENTS. 
the heels of the shoe asunder. Certain it is that lateral expan- 
sion alone could not act to the extent to make the shoe too large 
for the foot ; else lateral expansion must be so visible and demon- 
strative a fact, that any inquiry into its real existence is perfectly 
useless. 
In the last paragraph of the Editorial Remarks, Mr. Percivall 
has by some chance misstated me. It refers to the declination of 
the heels of the foot, and to that fact, that, if one heel of the foot is 
sprung, and the other heel of the same foot is not sprung, the 
heel which is at liberty will descend ; shewing that, when declina- 
tion of the foot can go on under any circumstances, it will do so. 
This, I think, is what Mr. Percivall intended to describe as what 
I had said, and this is consistent with the real fact*. 
An Account of some Experiments on the Foot of the Horse, to 
ascertain whether, under ordinary Circumstances of Shoeing, the 
Sole descends, or the Foot expands at its lower circumfereni Border. 
Having objected to the shoe intended to prove the fact of the 
descent of the sole, as used by Mr. Reeve, on the grounds that I 
considered the points of the screws could not be readily seen, as 
also that from its construction there was a great liability of a spring 
or giving at its lower surface, as previously explained, I adopted 
some shoes with trifling difference of construction, but on the same 
principle, which I shall now describe, and, for facility of reference, 
each shoe will bear a number and a name. 
1. The harrow shoe. — A plain shoe of good substance, and very 
wide in the web (if inch), having a very level wide seating from 
toe to heel, but slightly bevelled inside so as not to press on the 
sole, as also that the points of the screws may be more readily 
seen. Close to the inner rim of the shoe six finely pointed screws, 
rather more than one-eighth of an inch in diameter, were tapped 
and adapted. The shoe had eight nail-holes in the usual places, 
so that they could be used at pleasure, and it was five and a half 
inches wide. 
2. The harrow bar shoe. — An ordinary shoe of good substance, 
with a perfectly flat upper surface, the web one inch wide, having 
the usual number of nail-holes pierced four outside and three in- 
side, so that they could be used at pleasure. This shoe bad a 
strong bar welded across it, so that it would be opposite to the 
anterior part of the frog ; and through this bar, so as to be on each 
side of the toe of the frog, two finely pointed screws were tapped 
and adapted. This shoe was five and a quarter inches wide. 
No. 3. The lateral harrow shoe. — This shoe, for the purpose of 
* Mr. Gloag is quite right in this correction. The mis-statement originated 
in a misprint of hoofiox heel . — Ed. Vet. 
