THE HORSE’S FOOT. 
373 
form of the foot changes, and then results the change to the 
oval in the contour of the foot. Under the influence of the dis¬ 
placement of the phalanx, not only the flattening and afterwards 
the convexity of the sole and even its perforation results, but the 
plantar cushion is itself pressed down and crushed between the 
bone and the frog, which is then generally atrophied. A hoof of 
new formation is often developed between the sole and the infer¬ 
ior face of the phalanx, in order to prevent it from necessarily 
sinking. This increases the pressure upon the bone and contrib¬ 
utes to its atrophy and sometimes to its complete disintegration. 
But, between the surface of the coronary band and the origin 
of the hoof, whose formation is anterior to the laminitis, there may 
also be a new layer of hoof, more resisting than that which occu¬ 
pies the space between the wall and the podophyllous tissue, 
which is no more hoof mixed with the fibrinous exudation, but a 
pseudo-hoof secreted by the coronary band. The fibres of this 
hoof, however, instead of being rectilinear and growing down in 
the direction of the old wall, with the fibres of which they are 
continuous, are, on the contrary, sinuous and nodulated, and dis¬ 
posed to take a somewhat horizontal direction. There is often, 
besides the old wall, a deep horny tutnor, a keraphyllocele 
which grows inside, attempts to replace the soft horn secreted by 
the podophyllous tissue, and adds to the pressure of the os pedis, 
by forming a new wedge, more solid and resisting, which pro¬ 
duces a displacement of the phalanx, whose anterior face then 
often becomes more than vertical. This horny secretion from 
the coronary band is made evident by a section of a foundered 
foot, when the cutigeral cavity will be found much enlarged. 
Guyon, jr.,Hertwig, and Gourdon remark that the displacement 
of the os pedis is counterbalanced by the more rapid development 
of the heels and the projection of the foot forward ; and that thus 
the phalanx does not support the weight of the body except by 
its inferior border onty, but preserving, nevertheless, its primitive 
position. It is especially observed that when the foot is com¬ 
pletely deformed, the projection of the wall does not prevent the 
os pedis from remaining in its normal position. 
The growth of hoof from the podophyllous tissue and the 
