DISEASES. 683 



But, between the surface of the coronary band and the origin 

 of the roof, whose formation is anterior to the lamtaitis, there 

 may also be a new layer of hoof, more resisting than that which 

 occupies 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 ia often, 

 besides the old wall, a deep horny tumor, 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 produces a 

 displacement of the phalanx, whose anterior face then often be- 

 comes more than vertical. This homy secretion from the coronary 

 band is made evident by a section of a foundered foot, when the 

 cutigeral cavity will be found much enlarged. Guy on, Jr., Hert- 

 wig, 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 only, but preserving nevertheless, its primitive position. 

 It is especially observed that when the foot is completely de- 

 formed, the projection of the wall does not prevent the os pedis 

 from remaining in its normal position. 



The growth of the hoof from the podophyllous tissue and the 

 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 keraphyllous 

 leaves are stUl noticed, corresponding to the podophyllous laminse, 

 largely developed, and above all, running deeply into the waU of 

 the hoof. The space between the wall and the anterior face of 

 the OS pedis is fiUed 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 are 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 



