FORM AND ACTION OF THE FOOT. 



11 



the foot. This thin layer is continuous, with a horny 

 band extending round the upper part of the wall at its 

 junction with the hair, and sometimes prolonged down- 

 wards on the surface of the wall. (Fig. 7.) It appears to 



Fig. 7.— The Frog and Frog-band. 



he a continuation of the outer Inyer of the skin, analo- 

 gous to the free border of skin at the root of the human 

 nail. (Fig. 8.) It serves the useful purpose of covering 

 and protecting the young horn of tlie wall at its source of 

 iirrowth. 



■^t^^^7S»««3>^, 



Fig. 8.— The Frog-baud dutacUed from wall by a small wedge. 



The point of the frog, much the harder part, extends 

 forward to the centre of the sole. Though situated bet- 

 ween the bars, the frog is only attached to their upper 



