324 
A. ZUNDEL. 
which are infiltrated with blood. This is a proof of the intermit¬ 
tent character of the acting cause which has originally produced 
the corn. The ecchymosis, however, is not the actual seat of the 
corn,which is more in the velvety and especially in the laminated 
tissues, which are torn or bruised, the blood escaping through the 
sole simply by the action of the laws of gravitation. It is rarely 
that this lesion is looked for in case of dry corn, and it is usually 
ignored; but, in the confirmed corns, a true alteration of the 
laminae of the keraphyllous tissue is observed. This is replaced 
by a horny tumor, a kind of keraphyllocele, analogous to that of 
chronic laminitis, due to a union of the laminae under the influ¬ 
ence of the fibro-plastic exudation resulting from the inflamma¬ 
tion, which is of varying size, and presses more or less on the 
sub-horny tissues. In some cases, this horn breaks up little by 
little, and gives rise to quarter crack. The ecchymotic spots of 
dry corn may vary in size; they may range from the size of a 
pea to that of a ten-cent coin. At, other times they may occupy 
the entire space between the bars and the walls of the foot. 
In moist corn , there is not only hemorrhage, but also inflamma¬ 
tion proper, with serous exudation. The hoof is colored, as in 
dry corn, of a brownish tint, due to the infiltration of blood which 
occurred at the start; on searching deeper, one will discover be¬ 
tween the hoof and the living tissues beneath a separation of 
varying dimensions, filled by citrine serosity. Most frequently, 
this separation takes place at the line of union of the sole with 
the wall, and extends under both. The horny substance is then 
more or less impregnated with this serosity, and then has a char¬ 
acteristic yellow appearance and a waxy consistency. 
In suppurative corns , or more properly, suppurating, the in¬ 
flammation ends in suppuration. The pus is secreted by the vel¬ 
vety and laminated tissues. It makes room for itself by gradu¬ 
ally separating the hoof as its formation progresses. Before long 
it passes between the podophyllous grooves of the bars and of the 
quarters, the horny are loosened from the fleshy laminae, and in 
its ascending progress the pus soon makes its appearance between 
hairs and hoof at the quarter, at the heels, or at the glomes of 
the frog. It is not common for the pus to make its way through 
