hion is continuous. With the constant dragging in and down
of the coronary cushion there is given, to the horn-secreting papillae,
studding both the lower third of its outer face and its lowermost surface,
a distinct 'cant' outwards. Below the lowermost limit of the coronary
cushion, then, by reason of the cant outwards of the coronary papillae
in the situations mentioned, the horn of the wall takes a more outward
direction than normal, a fact which lessens in effect the contraction as a
whole really going on. It is interesting, too, to note that by this outward
cant of the wall below, and the bulging of the coronary margin above it,
the contraction (_a, a_) is heightened in effect, and caused to appear
greater than really it is.

From what we have said it follows that contraction of the heels, excepting
the extreme coronary margin, is existent generally, and not confined solely
to _a, a_.

We have, then, in this condition, as we indicated at the commencement,
but a phase in the evolution of ordinary contracted heels, for, with the
progress of the contraction already existing at _a, a_, and below those
points, it is only fair to assume that with it falling in of the at present
bulging coronary margin must sooner or later occur, that, though expanded
when compared with the wall below it, it will be really contracted as
compared with what it was once in that same foot.

We may therefore conclude this section by remarking that factors tending to
contraction of the heels in general are equally potent in the causation of
contracted coronet alone.

_Treatment_.--Exactly that described for contracted heels. Bearing in mind
that contracted coronary margin is but the onset of contracted heels, and
that its first exciting cause is that of removal of the ground-pressure
upon the frog, the most careful attention must be paid to the shoeing. The
use of bar shoes, ordinary frog pads, or heelless shoes and bar pads, are
especially indicated, together with abundant exercise. By these means the
normal movements of expansion will be brought into play, and the condition
quickly remedied.

C. FLAT-FOOT.

_Definition_.--By this term is indicated a condition of the foot where the
natural concavity of the sole is absent.

_Symptoms_.--In the flat-foot the inferior edge of the wall, the sole,
and the frog, all lie more or less in the same plane. It is a condition
observed far more frequently in fore than in hind limbs, and is seen in