paring away of the
horn of the sole becomes a matter of necessity. The freest possible exit
should be given to the pus, and this even when an opening has already
occurred at the coronet. Unless this is done, and done promptly, the
putrescent matter still contained within the hoof will make further inroads
upon the soft structures therein, and later upon the ligaments, and even
bone itself.

Having given drainage to the lesion by the dependent orifice in the sole,
poulticing should again be resorted to and maintained for at least three
or four days. The poulticing may then be discontinued, and the openings in
the sole injected with a weak solution of Tuson's spts. hydrarg. perchlor.,
a 1 in 20 solution of carbolic acid, a solution of copper sulphate, with
Villate's solution, or with any other combined antiseptic and astringent.
The success of the treatment is soon seen in the cessation of pain and in
the decreased amount of discharge from the opening in the sole.

Should pain unfortunately continue, the discharge remain, and a state of
fever reveal itself, then it may be understood that the suppurative process
has not been checked, that a portion of necrosed ligament, cartilage,
or bone still remains, which, surrounded as it is by pus organisms and
putrefactive germs, is sufficient to excite a constant irritation and
maintain the internal structures in a state of infection. In other words,
we have what is known as a quittor.

This will call for deeper operation. The horn of the wall must be removed,
and the diseased structures, whether gangrenous keratogenous membrane,
necrosed ligament, or carious bone, carefully excised or curetted. This
will be better understood by a reference to the chapter on Quittor, where
the means for carrying out the necessary operative measures will be found
described in detail.

_Surgical Shoeing for Corn_.--In the case of an ordinary dry corn, where
the injury has been definitely ascertained to be accidental, no alteration
in the shoeing will be necessary. Where, however, the corn is attended with
a more than ordinary degree of inflammation, or where for some reason or
other excessive paring has been practised, then it will become needful
to shoe with a special shoe. The object to be attained is the removal of
pressure from that portion of the wall next to the seat of corn.

The most simple shoe for effecting this is the ordinary three-quarter shoe.
The only way in which this differs from