THE SHOEING OF HORSES. 9 



3. *The coffin bone. 



4. The vascular or sensitive laminae of the foot. 



5. The vascular villi, or sensitive sole of the foot. The vas- 

 cular sole consists almost entirely of blood vessels, the function 

 of which is to secrete or form — 



6 6 6. The horny sole. 



7 7. The horny frog. 



8. The vascular frog. This, like the vascular sole, is to 

 secrete or form the horny frog. 



18. The vascular villi of the coronet. The vascular villi of 

 the coronet consists entirely of blood vessels, the purpose of which 

 is to secrete — 



TO. The horny wall. The wall is secreted at the top of the 

 hoof, at the junction of the skin and hair surrounding the coronet. 



12. The coronary frog band. The coronary frog band is 

 coloured green. The uses of this band we have explained when 

 treating upon the structure, at Plate II. 



1919. The cushion of the navicular joint, which principally 

 consists of a strong, elastic, yellow-coloured tissue, of a fibrous 

 nature. It is an abundance of this tissue which gives to the heels 

 and frogs of young horses the round, plump-like appearance, so 

 characteristic of these parts when perfect. This elastic substance 

 is in immediate contact with the termination of the tendon (15), 

 between which and the navicular, bone (16) is formed the navi- 

 cular joint ; this substance, forming (as it does) a cushion, will be 

 seen to act as a buffer to the joint in question ; while 7 7 will be 

 c 



