sely situated thereto, for in this
case the more superficial position of the diseased structure allows both
of readier exit of the discharges and of easier removal of the necrosed
portion and after-treatment of the wound.

_(c) Caries of the Bones_.--Portions of the os pedis, more especially of
its wings, and therefore usually occurring in conjunction with necrosed
cartilage, become carious in quittor. In many cases it is impossible to say
with certainty when this has occurred. In a few instances, however, the
exuding discharge gives evidence of what has happened. It is thin, but
extremely offensive, with the characteristic odour of decayed bone or
tooth, and with a feel that is gritty with contained particles of broken-up
bone. If, with a discharge of this nature present, the probe also conveys
to the fingers the sensation that bone is reached, then diagnosis may be
sure.

_(d) Ossification of the Cartilage_.--This may take place in part or in
whole. It, of course, constitutes Side-bone, a fuller description of which
will be found in a later portion of this chapter.

_(e) Penetration of the Articulation_.--This may occur either as a result
of the suppurative changes or as an accident in excision of the diseased
cartilage. Unless it is followed by a severe purulent arthritis, it is not
so grave a complication as at first sight it would appear.

_(f) Synovitis and Arthritis (Purulent)_.--Should this complication arise,
the case is a most serious one. Beyond here mentioning the fact that it may
occur, we shall not dwell on it. Fuller consideration is given to it in
Chapter XII.

_Treatment_.--The various treatments adopted for the cure of sub-horny
quittor offer the veterinary surgeon a large number to select from. We
will describe them in the order in which they are, perhaps, most commonly
practised.

_Poultices and Hot Baths_.--As in cutaneous quittor, and as in coronitis,
when the pus formation is only suspected, and has not yet broken out at the
coronet or elsewhere, then the first indication in treatment is the use
of warm poultices or of hot baths. Their application is in most cases
productive of pointing at the coronet.

Directly this appears it is a wise plan to thin the wall down with the rasp
immediately below the swelling. To some extent it relieves the pressure of
the inflammatory products within, and at the same time paves the way for
operative measures which may be necessary later on.

With the brea