806 



THE APPARATUS OF THE SENSES. 



Fig. 374. 



H F 



of inflexion of its extremities ; while these extremities themselves, passing 

 along the inner border of the sole, are termed the bars. 



Examined with regard to the direction 

 that it affects in its relations with the 

 ground, this envelope is seen to be much 

 inclined in its middle region or toe, and 

 this obliquity gradually diminishes until 

 the posterior part of the quarters is reached ; 

 at this point the wall is nearly perpen- 

 dicular. 



The following are the characters it 

 offers in the conformation of its faces, bor- 

 ders, and extremities : 



The external face, convex from side to 

 side, and perfectly straight from the upper 

 , Inner suXVo^eriopTe,' or coronary to the lower border, is smooth, polished, 

 frog-band, with some hairs passing and shining : an appearance it owes to a 

 through ; a', Outer surface of same thin horny layer, independent of the wall 

 at posterior part of foot ; a", A sec- p rO per, designated the periople. 

 tMcknes g & to^ W Quartei of W the This periople forms, on the upper part 

 hoof, from b to the front is the out- of the wall, a kind of ring, continuous with 

 side (or inside) toe ; from c to d the the bulbs of the plantar cushion, and with 

 outside (or inside heel) ; e, Frog ; /, the frog, of which it is only a dependency ; 



r responding, by its upper margin, to the 

 perioplic ring, w hich secretes it ; towards 

 the lower part of the wall it is gradually 

 lost, friction incessantly thinning and destroying it. 



The inner face presents, over its entire 

 extent, the white parallel leaves which 

 dovetail with the laminas of the podo- 

 phyllous tissue. Collectively, these are 

 named the keraphyllous tissue. 



The superior border is bevelled-off, 

 on its inner aspect, into a circular con- 

 cavity, into which the plantar cushion is 

 received. This excavation is named the 

 cutigeral cavity, because of its relations ; 

 it offers on its surface a multitude of 

 minute openings the commencement of 



HOOF, WITH OUTER PORTION OF THE WALL fl^ horny cana li c uli which receive the 

 REMOVED TO SHOW ITS INTERIOR. "11 , / ri , i 



a, a, Periople, or coronary frog-band; 6, Vlllosities of the CUtlduriS. 



Cavity in upper part of wall for core- The inferior border, in contact with 



nary cushion ; c, Upper, or inner, surface the ground, and subjected to wear in 



of "bar;" d, Vertical section of wall ; <f, unshod animals, is united inwardly, and 



reception ol coronary cushion; 

 Keraphylla, or horny lamin*. 



Fig. 375. 



bar-, /", Ditto of wall ; /"', Lateral aspect 

 of a lamina ; g, Upper, or inner surface 

 of the horny sole ; h, Junction of the 



horny lamin* with the sole (the white 

 line ) ; i, Toe-stay at the middle of the 



toe; ^Upper, or inner surface of the 

 horny frog ; /, Frog-stay ; w, Cavity 

 corresponding to a branch of the frog ; 



cor?espooding to the body of 



circumference of the sole. ^ 



The extremities, constituted by the 

 reflected and re-entering prolongations 



^ ag ^ ft f outwardly, the 



, . , ', , .' , , t7 ' 



external side of the lateral lacunae of 

 the frog ; they are provided, inwardly, 

 with laminae like the rest of the wall. 

 The upper margin of these prolonga- 



