he above.

Another method is by means of a ten- to fifteen-per-cent. solution of
salicylic acid, in alcohol or collodion, or the following:--

[Rx] Ac. salicylici, ...................... gr. xxx
Ext. cannabis Ind., .................. gr. x
Collodii, ............................ f[dram]iv. M.

This is painted on the corn night and morning for several days, at the
end of which time the parts are soaked in hot water, and the mass or a
greater part of it, will be found, as a rule, to come readily away; one
or two repetitions may be necessary. Lactic acid, with one to several
parts of water, applied once or twice daily, acts in a similar manner.

Soft corns, after the removal of pressure, may be treated with the solid
stick of nitrate of silver, or by any of the methods already mentioned.

In order that treatment be permanently successful, the feet are to be
properly fitted. If pressure is removed, corns will commonly disappear
spontaneously.

#Cornu Cutaneum.#
(_Synonyms:_ Cornu Humanum; Cutaneous Horn.)

#What is cornu cutaneum?#

A cutaneous horn is a circumscribed hypertrophy of the epidermis,
forming an outgrowth of horny consistence and of variable size and
shape.

#At what age and upon what parts are cutaneous horns observed?#

They are usually met with late in life, and are mostly seated upon the
face and scalp.

[Illustration: Fig. 32.
Cutaneous Horns. Showing beginning epitheliomatous degeneration of the
base. (_After Pancoast._)]

#Describe the clinical appearances.#

In appearance cutaneous horns resemble those seen in the lower animals,
differing, if at all, but slightly. They are hard, solid, dry and
somewhat brittle; usually tapering, and may be either straight, curved
or crooked. Their surface is rough, irregular, laminated or fissured,
the ends pointed, blunt or clubbed. The color varies; it is usually
grayish-yellow, but may be even blackish. As commonly seen they are
small in size, a fraction of an inch or an inch or thereabouts in
length, but exceptionally attain considerable proportions. The base,
which rests directly upon the skin, may be broad, flattened, or concave,
with the underlying and adjacent tissues normal or the papillae
hypertrophied; and in some cases there is more or less inflammation,
which may be followed by suppuration. They are usually solitary
formations. They are not, as a rule, painful, unless k