1909.] 



Shoeing of Horses. 



911 



pastern and the top of the coffin bone ; at the back of the leg 

 there are two, the Flexor pedis perforans and the Flexor 

 perforatus ; the former rolls over the navicular bone and is 

 inserted into the coffin bone, and the latter is attached to the 

 coronet bone. 



The Frog Pad. — At the back of the foot, occupying the 

 cavity which lies between the wings of the coffin bone and 



&ARS.---- 



5oll 



Fig. 2. 



the lateral cartilages, is a thick, tough elastic pad, known 

 as the frog pad, or sensitive frog, the object of which is to 

 act as a cushion in lessening the shock to the column of 

 bones. 



The Wall or crust.— This is the term applied to the outer 

 covering of the foot, the bars of which turn in at the heels, 

 and continue down each side of the frog (Fig. 2). On the 

 upper edge of the wall is a groove known as the coronary 

 cavity, in which fits the coronary band, a species of fibrous 

 substance, the object of which is to secrete the material neces- 

 sary for the formation of the horny growth which builds up 



