to side exceeds its height by about one fifth ; it is situated 

 partly -withui, and pai'tly without the hoof ; ""' it supports the 

 pastern bone, and rests upon the coffin and navicular bones. 



The lateral cartilages are attached to the ujaper edge of 

 the wings of the coffin bone, and project backwards beyond 

 the bone, giving form and substance to the heel ; about half 

 of each rises above the hoof, as high as the pastern joint, and 

 can be distinctly felt under the skin. 



The sensitive covering of the coffin bone is a prolongation 

 of the coronary substance ; it is firmly attached to the surface 

 of the bone, and is collected into numerous little plaits or 

 folds, which run in parallel, slanting lines down its sides. 



The sensitive sole, or, as it is sometimes called, the fleshy 

 sole is about the eighth of an inch thick, and is almost 

 entirely made up of blood vessels and nerves ; it is one of 

 the most vascular and sensitive parts of the body, and is 

 attached to the lower edge of the sensitive covering of the 

 coffin bone, to the bars, and point of the frog, and also with 

 great firmness to the whole of the arclied under surface of 

 the coffin bone. 



The sensitive frog includes not only the part corresponding 

 to the sensitive sole, but also the pecuhar, spongy, elastic 

 substance, which intervenes between it and the navicular 

 joint, and fills the space between the cartilages. The proper 

 sensitive frog is thicker, and less finely organized, than the 

 sensitive sole, possessing fewer blood A^essels and nerves. 



The coffin joint is formed by portions of the three bones of 

 the foot meeting together within the hoof,t and is furnished 

 * Plate 2, fig. 4. f Plato 2, fig. 4. 



