CANADIAIT HOESE AND HIS DISEASES. 9 



of the OX tribe,) in which we have a tumour on the bone, 

 partly bony and partly fleshy, occurring commonly on the 

 jaws or ribs ; Enchpndroma, consisting of a cartilaginous or 

 gristly tumour on a bone ; it is more common in man, but 

 is also seen in cattle, and occasionally in the horse. 



EXOSTOSIS. 



Exostosis is, in general, the consequence of periostitis, or 

 inflammation of the vascular membrane covering the bone, 

 though it doubtless also arises from other causes. It some- 

 times comes on without having attracted the least attention, 

 or produced the least apparent disturbance to the animal, and 

 may appear pn any bone in the body, or on any part ef a 

 bone, sometimes so small as to escape observation altogether, 

 and sometimes, as observed by Professor Dick, as large as a 

 child's head. It may be caused by external injury, or it may 

 be 'the result of constitutional disturbance, more commonly 

 the former. Its nature, causes, symptoms, and , treatment 

 wiU be better understood by taking the most common ex- 

 ample — viz., Splint. 



SPLINT OE SPLENT. 



Splint is a hard bony tumour occurring on the inside of 

 the shank or cannon-bone of the fore-leg, between the knee 

 and fetlock. It is situated partly on the splint-bone, (from 

 which it takes its name,) and partly on the cannon. It 

 occurs most commonly, nay, almost invariably, in young 

 animals, the reason of which is obvious. The periosteum in 

 them being more vascular than in old animals, it is more 

 liable to inflammation ; which is very readily induced in tue 

 unsolidified bones of the young animal, when exposed to con- 

 cussion or external violence. ■ It occurs in the inside, be- 

 cause the centre of gravity falls through that part ; when it 



