VETERINARY MEDICAL SOCIETY. 
359 
Mr. Mavor could not accede to Mr. Goodwin’s account of this 
affection of the hock. He did not conceive it to be ulceration of 
the synovial membrane, but ossification of that part of the bone 
in connexion with the ligaments which connected these bones to¬ 
gether. 
Mr. Goodwin acknowledged that Mr. Turner was the person 
who first directed his attention to the subject of disease of the 
joints. He had, from his situation, opportunity, and he had en¬ 
deavoured to profit by that opportunity, of observing the progress 
of numerous cases of affection of the navicular joint and of the 
hock, and of examining the morbid appearance which the parts 
exhibited after death ; and, when he found abrasion, ulceration of 
so delicate a membrane as the synovial, and considered the ex¬ 
treme torture which it must have produced, lie was at no loss to 
account for the lameness. He then referred to some specimens 
on the table, and clearly pointed out the seat of disease near the 
centre of the bones, removed from the ligaments, and not in the 
slightest degree affecting them. 
Mr. Langworthy perfectly coincided with the views of the Se¬ 
cretary. He would have these diseases clearly distinguished from 
ach other. He offered his acknowledgments to Mr. Goodwin, 
and said that many difficulties would hereafter be removed from 
his mind on the subject of lameness. 
Mr. Mavor related a case in which he had found not ulcera¬ 
tion of the synovial membrane, but spiculse of bone, in the liga¬ 
ments. 
Mr. Henderson thought that the process of ossification might 
extend to the ligaments; but, in the great majority of cases, the 
disease commenced with inflammation and abrasion of the syno¬ 
vial membrane, and near the centre of the bones. 
Mr. Goodwin asked Mr. Mavor, if he had ever taken the 
trouble to trace out a fair case of navicular lameness, commencing 
with inflammation of the synovial membrane; then effusion, ul¬ 
ceration, proceeding from the membrane to the cartilage, and from 
the cartilage to the bones, and altogether becoming a spongy mass. 
The horse is lame before there is any disease externally; the ex¬ 
ternal alteration of form is a consequence of the internal disease. 
Mr. Mavor thought there was no analogy between the na¬ 
vicular and hock joints. In the one there is a single bone, in the 
other many bones : in the one case the injury occurred between 
a bone and a tendon ; in the other, two bones are opposed to each 
other. 
Mr. Youatt .—But one important analogy remains, and the 
most important of all—the bones in both joints are covered by a 
synovial membrane. 
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