AND HOW TO KEEP IT SOUND. 57 



larges the hole, and make a free passage for the return of the 

 shoe. 



Again — on comparing the parts marked h. c. d. in both 

 feet with each other, we shall find them in one, defenceless 

 and exposed ; while in the other they are securely sheltered 

 by a bar of iron, — which bar of iron, by its near approach 

 to its neighbor, often saves the foot from alighting upon a 

 stone with a violence that would thrill through horse and 

 rider. 



