16 THE ART OP HORSE-SHOEING. 



** quick" to wicli the sole is attaclied. Its surface is; 

 covered with papillae, like those on the coronary band, 

 but much smaller, giving an appearance somewhat like- 

 the pile of velvet. From these the horn fibres of the 

 sole are formed, and a firm means of connection i& 

 afforded for the floor of the hoof. 



Fig. 12.— Under Surfaco of Foot shovring Sensitive E'lr.^ and Sole. 



The Sensitive Frog in structure resembles the 

 sensitive sole, bnt its papilljs are very much smaller, and 

 the surface, therefore, is smoother. The irregular, pro- 

 minent surface of the frog, with its cleft and the space 

 at each side of it, is exactly reproduced on the sensitive 

 frog, as might be expected, for the one is moulded on the 

 other. There is one difference between the sensitive- 

 frog and the other jiortions of the sensitive foot whicli I 

 may here mention. It is not attached to the bones of the 

 foot, except by its point, but is situated behind the bone, 

 and has as a basis a mass of soft tissue which forms art-, 

 important cushion or pad, to be referred to later. 



