short of injuring the coronary
cushion beneath. Grooves forming the sides _ab_ and _bc_ of the triangular
piece of horn are next made, and the horn contained within the lines _ab,
bc_, and _ca_, carefully removed. The grooves are the easiest made by a
cautious use of the firing-iron. The greater thickness of the horn may
thus be penetrated, and the grooves afterwards carried to their full and
requisite depth by the use of the drawing-knife.

With the removal of the horn the diseased structures are exposed to view.
All such should be removed by a free use of the scalpel, and a suitable
dressing afterwards applied. A necessary factor in the treatment is the
employment of pledgets of antiseptic tow. With these the exposed tissues
are covered, and the successive turns of a bandage run tightly over
them, so as to exert a moderate degree of pressure. When haemorrhage 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.

[Illustration: FIG. 97. The dotted lines outline the V-shaped portion of
wall to be removed in the treatment of complicated toe-crack.]

[Illustration: Fig. 98. The dotted lines indicate the portion of wall to be
removed in the complete operation for complicated toe-crack.]

_(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
_complicated_ 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 _c_. The grooves _ab_
and _de_ 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