DISEASES OF THE LATERAL CARTILAGES 3835 
With the patient thus secured we first of all ascertain by 
means of the probe whether or no the non-healing of the 
wound is due to the presence of a fistula. Decided in the 
negative, we take an ordinary flat firing-iron, and with it 
cut away a portion of the skin immediately around the still 
open wound, carrying our incisions deep enough to ‘ scoop’ 
out a large portion of the new inflammatory tissue beneath. 
With the loss of pressure from beneath, occasioned by the 
removal of so much of the cicatricial tissue, the epidermis 
the more readily closes over the wound. To a large extent 
also this new growth of epidermis is helped by the renewal 
of the inflammatory phenomena brought into being with 
the cauterization. 
2. SuB-HORNY QUITTOR. 
Definition.—A fistalous wound of the foot in which the 
lower and blind end of the fistula is situated below the 
level of the coronary margin of the wall. 
Causes.—These, again, will be practically the same as 
those mentioned in the cause of cutaneous quittor — 
namely, bruises, punctures, wounds—in fact, any injury 
upon the coronet severe enough to cause death of tissue 
and a suppurating wound. We may thus expect sub-horny 
quittor to follow upon treads, overreach, accidental injuries 
with the stable-fork, and kicks from other animals. 
Sub-horny quittor may also arise without original injury 
at all to the coronet. Hither from a violent blow upon the 
hoof, or from the animal himself kicking violently against 
a wall, death of a portion of the sensitive structures takes 
place within the hoof, guppuration ensues, and the forma- 
tion of quittor commences. With the escape of the pus at 
the coronet the quittor is fully formed. 
Any other diseased condition of the foot in which sup- 
puration is present may in like manner terminate in quittor. 
In complicated sand-crack, suppurating corn, or in ordinary 
pricked foot quittor may be a sequel. In these conditions 
the pus formation either goes unnoticed or is neglected, 
and after seriously invading the sensitive structures within 
