THE EAR, THE EYE, THE SKIN, AND THE FOOT loo 



understood why the two correspond in eolor. The hoof is divided 

 into the wall, the sole, :ind the fros (FiRs. 44, 4'i). 



The wall is all that portion which is seen when the foot rests 

 upon the ground. It ^ives the foot its form. The horn is very 

 hard and solid and aflords adequate protection to the sensiti\'e 

 structures beneath it. At the toe the wall is highest; from this 

 point backward it gradually decreases in height, passes around the 

 l>ulbs of the heels, and turns forward and inwaixl ti) form the hnrx, 

 which are finally lost in the odg(> of the sole near the apex of the 

 frog. It thus forms at each heel an angle known as the buitrcsf;. 

 Each buttress encloses a branch of the liornv sole. The imier sm'- 



Pen.iplr 

 CoroNdi'!/ 



Fii. 



'(-iTopk of hcd 



Jiidfjf inrmtd 



TT-j ■, I- C^J, '"/ ^t^' and frog 



II /(i/c line >^"''- ■' ' " 



44. — Half of houf, internal surface. (Sijjson, Anatomy of Domestic 

 Animals.) 



face of the wall presents about six hundred horny leaves or laminip 

 which dovetail with the .sensitive laminae. A firm union is thus 

 made, so that it is verj' difficult to separate the two. The upper 

 edge of the wall is thin, flexible, and grooved for lodgment of the 

 coronary band. The lower edge is called the "bearing surface," 

 and is the part to which the shoe is fitted. At the toe the wall is 

 thickest; as the riuarters are approached it gets considerably 

 tliinner. It rec|uircs about twelve months for thi> wall to grow 

 from the coronet to the ground at the toe, six to eight months at 

 the quarters, and three to five months at the heels. 



The sole is that horn nurtured by the sensitive tissue covering 

 the sole surface of the coffin bone. It is divided into a body and 



