182 DISEASES OF THE HORSE’S FOOT 
degree of pressure. When hemorrhage has accompanied 
the operation, this dressing should be removed on the 
following day, the wound dressed, and the pledgets of tow 
and the bandage renewed. Any after-dressing need only 
then be practised at intervals of a week. Repair after this 
operation is rapid, and takes place both from the exposed 
podophyllus membrane and from the coronary cushion. 
(d) By stripping the Wall from the Coronary Margin to 
its wearing Edge on Either Side of the Crack.—This is 
merely a more extensive application of the method just 
described, and is only indicated in a complete and com- 
plicated crack that has refused to yield to other modes 
of treatment (see Fig. 98). 
As in the previous case, a groove is run from a to «. 
The grooves ab and dc are then continued to the 
lowermost edge of the wall, and the whole of the wall 
within these points removed. To facilitate removal, the 
white line should be grooved between the points b and d. 
After-treatment is exactly the same as that just referred to. 
B. CORNS. 
Definition.—In veterinary surgery the term ‘corn’ is 
used to indicate the changes following upon a bruise to 
that portion of the sensitive sole between the wall and the 
bar. Usually they occur in the fore-feet, and are there 
found more often in the inner than in the outer heel. 
The changes are those depending upon the amount of 
hemorrhage and the accompanying inflammatory pheno- 
mena occasioned by the injury. 
Thus, with the hemorrhage we get ecchymosis, and con- 
sequent red staining of the surrounding structures. As is 
the case with extravasations of blood elsewhere, the hemo- 
globin of the escaped corpuscles later undergoes a series of 
changes, giving rise to a succession of brown, blue, greenish 
and yellowish coloration. 
With the inflammation thereby set up we get swelling of 
the surrounding bloodvessels, pain from the compression of 
oe Mises wi Ee ee A 
