AS TO SOUNDNESS. 63 



alighting on the points at and between a c and ^ ^ 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 d and 

 d b, not being so nailed to iron, can move. If you 



Fig. 5. 



observe a shoe that has been worn for a time, you will 

 see this is so for yourselves. 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 a d and d b respectively, the heels recede from 



