AS TO SOUNDNESS. 63 
alighting on the points at and between @c-and ¢é do 
not in the shod foot terminate in the bottom of the wall 
of the foot, but in unyielding iron, and the hoof at these 
points is bound tightly down to this iron by nails, so that 
it cannot move; the remaining parts between a. @ and 
d 6, not being so nailed to iron, can move. If you 
Fic. 5. 
observe a shoe that has beeu worn for a time, you will 
see this is so for yourselvés. The bright mark left by 
the constant movement is familiar to every horseman. 
It also follows that (as less pressure yields to greater 
pressure), the line of greatest weight passing through the 
middle of the frog, and the other lines being longer 
between ad and d b respectively, the heels recede from 
