REGIONAL ANATOMY 37 
Examined on the foot, deprived of its horny covering, 
the sensitive lamine are, the majority of them, in close 
contact with each other. In the normal state this is not 
so. The interstices between the leaves are then occupied 
by the horny leaves, to be afterwards described as existing 
on the inner surface of the wall. 
Reaching and rounding the heels, the sensitive lamine 
extend forward for a short distance, where they interleave 
with the horny laminz of the bars. 
Much discussion has centred round the point as to 
whether or no the cells of the sensitive lamine take any 
share in the formation of the horn of the wall. This will 
be alluded to in a future chapter. 
I. THE JHOOF. 
Removed from the foot by maceration a well-shaped hoof 
is cylindro-conical in form, and appears to the ordinary 
observer to consist of a box or case cast in one single piece 
of horn. Prolonged maceration, however, will show that 
the apparently single piece is divisible into three. These 
are known as (1) THe Watt, (2) THe Sous, and (3) Tus 
Frog. In addition to these, we have also an appendage 
or circular continuation of the frog named (4) THe Pzri- 
OPLE, or Coronary Frog Banp. These various divisions we 
will study separately. 
1. Tue Watt is that portion of the hoof seen in front 
and laterally when the horse’s foot is on the ground. 
Posteriorly, instead of being continued round the heels to 
complete the circle, its extremities become suddenly 
inflected downwards, forwards, and inwards. These in- 
flections can only be seen with the foot lifted from the 
floor, and form the so-called Bars. It will be noticed, too, 
with the foot lifted, that the wall projects beyond the level 
of the other structures of the plantar surface, taking upon 
itself the bearing of the greatest part of the animal’s 
weight. 
The horn of the wall, viewed immediately from the front, 
