124 



STRUCTURE OF THE FOOT. 



(No. 1.) (No. 2.) 



a The external crust seen at the quarter. a a The frog. 



6 The coronary ring, c The little horny plates 6 The sole, 



lining the crust, d The same continued over c c The bars, 



the bars, e e The two concave surfaces of the d d The crust. 



inside of the horny frog. / That which ex- 

 ternally is the cleft of the frog, g The bars. 

 h The rounded part of the heels, belonging to 

 the frog. 



surface being quite soft, while the outer surface is hard and 

 smooth. 



If we now look at the sole, we will find it from one-eighth 

 to three-sixteenths of an inch thick, a little arched, of a 

 dense yielding texture, joined firmly to the lower and inner 



(No. 3.) Interior of a Healthy Foot, 



(No. 4.) Sole of Hind Foot. 



edge of the wall. At the center, occupying the space be- 

 tween the heels, and extending well forward to a point 

 towards the toe, is a softer an^ thicker formation of horn, 

 admitting of great elasticity, which is the frog. (See cut 

 No. 2.) Between the frog and its connection, with the sole, 

 on each side, is a little strip of hard horn, extending from 

 the heels forward, called bars, which are a continution of 



