7 02 ANATOMY AND PHYSIOLOGY OF THE HORSe’s FOOT. 
beneath, and which are exposed around it (fig. 21) ; then let 
a notch be made in the edge of the wall at a point corre- 
sponding to the upper or lower border of the isolated piece. In 
Fig. 20. 
Fig. 21. 
the course of a month or two it will be observed that the 
relative position of the latter to the former is unaltered, and 
that it has moved downwards at the same rate as the wall it- 
self, though, to all appearance, it has had no connection with 
it. This demonstrates the fact that the horn — the remains 
of the horny laminee which could not be entirely removed 
from the bottom of the pedal grooves — has continued to be 
