ARTISTIC HORSE-SHOEINO. 15 



The dimensions of the wall var^^ in different situations. 

 In front it is deepest, but toward the quarters and heels it 

 diminishes and becomes thinner ; at its angles of inflection 

 (the points of the heels) it is strong-. This structure is 

 fibrous, the fibres pass directly parallel to each other from 

 the coronet to the gTOund, each fibre being- moulded on, as 

 it is secreted, by one of the minute tufts of blood vessels 

 lodged in the cavity at the coronet. 



Fig. 8 shows the dittereiit kinds of horn of which the 

 horse's hoof is made up. a, a, is the wall: the outer or dark 



Fig. 8. 



portion constitutes the crust of the wall; 6, is the light col- 

 ored or yielding horn of the sole; c, is the elastic horn of 

 the frog. 



Next we have to consider the Horny Sole, and the same 

 authority describes it as being ''contained within the lower 

 margin of the wall and is a concave plate covering the low- 

 er face of the pedal bone. ' ' In structure it is fibrous like the 

 wall, the fibres passing in the same direction, and are form- 

 ed in the same manner by the tufts of blood vessels project- 

 ed from the membrane Avhich immediately covers the bone. 



