244. HEPWORTH, ON THE STRUCTURE OF THE HORSE’S FOOT. 
until they reach the centre of the bottom of the foot, where 
they terminate. These inflections or processes of the wall con- 
stitute the bars. Altogether, the wall may be said to form 
about two thirds of the entire hoof. 
The wall is divided into the toe, the quarters, the heels, the 
superior or coronary border, the inferior or solar border, the 
lamine, and the bars or appendages. 
The toe forms the bow or front of the hoof, and compre- 
hends about two thirds of the superficies of the wall. 
The quarters are the portions of the wall intermediate 
between the toe and the heels. 
The heels are the two protuberant portions of the wall, by 
which it is terminated posteriorly. 
The superior or coronary border is the circular, attenuated, 
concayo-convex part, entering into the composition of the 
coronet. Its extent is marked exteriorly by the whitish as- 
pect it exhibits, and also by some partial separation and 
eversion of the outer flakes of horn around its junction with 
the wall below. Externally, it assumes the same character as. 
the wall below it; but its internal surface is altogether 
different. Instead of possessing laminz, the surface is 
smooth and uniformly excavated, being moulded to the form 
of the sensitive coronet, and everywhere presenting numerous 
pores for the purpose of receiving the secreting villi. Su- 
periorly, the coronary border presents two edges, having a 
groove between them for the reception of the terminating 
border of the cutis (true skin). Itis this groove that marks 
the separation of the coronary border into two parts—the in- 
ternal edge, belonging to the inner part, which is the begin- 
ning of the wall itself; the external edge to the white band, 
by which the other is embraced, and to which Mr. Clark has 
in particular drawn our attention, under the appellation of 
“coronary frog-band.”’ This covers the proper or veritable 
coronary border of the hoof, having through its fibres a sort of 
dovetail connection withit. As it recedes backwards it grows 
broader, so that its breadth becomes doubled, being about 
half an inch broad in front and one inch behind. Vertically, 
it is thickest in its middle, its inferior edge, like the superior, 
becoming attenuated, until it grows so fine as to end in im- 
perceptible union with the substance of the wall, giving it its 
beautifully polished surface; from the heat, however, to 
which the hoof is artificially exposed, the inferior border often 
splits from the crust and becomes everted, becoming at the 
same time of a whitish colour. Posteriorly, we find it con- 
tinued round the heels of the wall and frog, and from thence 
across the back of the cleft, forming altogether a complete 
