AS TO SOUNDNESS. > 7 
the ulcero-plastic. You find the best example of it 
occasionally on macerating bones to make up a skeleton, 
You find the cuneiform bones, as it were, glued to the 
tibial without any outgrowth soever., This takes place 
first by removal by ulceration of the cartilage, when the 
blood-vessels from the respective surfaces throw out 
lymph, which in turn gets tunnelled by blood-vessels and 
so organized. There is a very strong tendency for the 
‘parts in question to undergo this change. The first 
skeleton I ever-put up when I was an apprentice was 
the skeleton of a pony we knew to be over thirty years 
.old, which had spent an easy life. The cuneiform 
bones and the scaphoide of one hock were as I have 
described, and no doubt this was due to the animal 
being at liberty to rest the part whilst this change was 
proceeding. Rest of the parts must have been perfect 
during this time, because movement would have so. 
‘disturbed the plastic lymph that some of it would 
undoubtedly have oozed out between the bones, and 
we then should have had spavin. We have plenty of 
instances of this form of inflammation (?) The vertebrae 
are very prone to become glued together (ankylosed) 
on account of their limited mobility, more especially the 
lumbar vertebree. The lower bones of the hock have 
_no movements one on the other to make it worth the 
while, so to speak, of nature. to maintain these joints 
with their synovial membranes, cartilage, etc., so that 
these parts, like the lumbar vertebre, have a very 
strong tendency, like the little-used lumbar joints, 
