374 
A. ZUXDEL. 
coronary band is not easily stopped. The horny masses which 
are formed continue to increase, and even soon end in uniting. 
There then remains a thick mass of deformed shape, four or five 
times thicker than the normal wall, but where the kerapliyllous 
leaves are still noticed, corresponding to the podophyllous lamime, 
largely developed, and above all, running deeply into the 
wall of the hoof. The space between the wall and the anterior 
face of the os pedis is filled with pus besides the secreted hoof; 
the seedy toe, if it existed, disappears. Though the hoof becomes 
thus much more voluminous than before, the deep parts aie not 
any more in their normal condition, but are lodged in a smaller 
and smaller space, and are thus in such a state of compression 
that they become atrophied. The bone is altered in its texture, 
as well as in its form, and becomes denser and more brittle. One 
might suppose that as the disease progresses, the os pedis would 
become pressed backwards more and more towards the sole, in 
consequence of its giving way under the pressure. This, how¬ 
ever, is not so. As the old normal walls disappear, the new horn 
yields to the pressure from forward, the heels rise, the os pedis 
resumes its horizontal direction, and the danger of hernia of the 
bone diminishes, and a- hypersecretion of the hoof is even noticed 
towards the point where the hernia would have taken place, in 
the middle of the pumiced sole. 
We have, so far, supposed that chronic laminitis is always 
manifested by the presence, between the internal face of the wall 
and the podophyllous surface, of a mass of abnormal hoof. But 
there are cases, after hemorrhage, and especially after serous 
exudation, where, instead of it, a cavity is found—a seedy toe. 
There is also an entire separation between the os pedis and 
the wall. But the horny production, that of the podophyl- 
lous tissue especially, is not sufficient in amount to fill up the 
whole space, there being hoof only upon the podophyllous tissue. 
There is then a sound wall formed, separated from the old one 
by a vacuum, which is often filled by a dry mass derived from 
the blood and serosity, mixed with the horny cells. But moie 
frequently the separation is limited to the height of the podophyl¬ 
lous tissue, and the wall yet remains adherent to the coronary 
