operation, is infinitesimal (canker largely destroying
sensation), compared with the pain produced in the totally unnecessary
process of tearing healthy horn from a highly sensitive tissue.

[Footnote A: The words in italics are alterations in the original article
made by Mr. Malcolm in a private letter to the author (H.C.K.).]

'Having by means of the knife and cautery removed every known particle of
disease, the next procedure is to pack the surface of the sole and frog
thus exposed with a _mild dressing, such as vaseline; but if the cankered
surface has not been efficiently, scraped, than there is required a more_
[A] powerful astringent or caustic dressing, which may vary considerably
according to the individual fancy. A great favourite of mine consists of
equal parts of sulphates of copper, iron, and zinc, mixed with strong
carbolic acid, a very little vaseline being added to give the mass
cohesion. The dressing, covered by a pledget of tow, is held in position
by a shoe with an iron or leather sole, and the dressing and tow together
should be of sufficient bulk to produce slight pressure on the sole when
the nails of the shoe are drawn up. This insures contact between the
dressing and the exposed surface, as well as any benefit derivable from
pressure.

[Footnote A: The words in italics are alterations in the original article
made by Mr. Malcolm in a private letter to the author (H.C.E.).]

'The dressing of the foot and nailing of the shoe can usually be more
expeditiously performed when the horse is on his feet than when prone. If
only the frog, or the frog and a small part of the sole, be involved, the
horse should be kept at work, but if a large part or the whole of the sole
a few days' rest may be necessary; but as soon as the condition of the foot
will allow, work should be resumed, and it is simply marvellous how sound a
horse will walk while minus the greater part of his sole from canker.

'On the second day following the shoe should be removed, and the foot
redressed. To effect this it is necessary to recast the horse. Commencing
at the edge of the sound horn, at the most dependent part of the foot,
all new horn, no matter what its condition, must be pared to the quick,
especial care being taken to effectually remove any lingering disease. Want
of success is frequently attributable to neglect of this precaution.
A small particle of canker remains undetected, forms a new centre of
infection, and just whe