m with felt rings or corn plaster. To remove the corn
the foot should be soaked for a long time in warm water, in which is
dissolved washing soda, and then the surface of the corn is gently
scraped off with a clean, sharp knife. Another useful method consists
in painting the corn, night and morning for five days, with the
following formula, when both the coating and corn will come off on
soaking the same for some time in warm water:

Salicylic acid 30 grains
Tincture of iodine 10 drops
Extract of Cannabis Indica 10 grains
Collodion 4 drams

Mix.

When the tissues about the corn become inflamed the patient must rest
with the foot elevated and wrapped in a thick layer of absorbent
cotton saturated with a hot solution of corrosive sublimate (one
tablet to the pint of water) and covered with oil silk or rubber
cloth. Pus must be let out with a knife which has been laid in boiling
water.

If corns are removed by the knife the foot should be previously made
absolutely clean, the knife boiled, and the paring not carried to the
extent of drawing blood. The too-close removal of a corn may lead to
infection of the wounded tissues with germs, and in old people, and
those with feeble circulation, gangrene or erysipelas may result. Soft
corns are treated by removal of the surface layer, by soaking in
washing soda and hot water and scraping as above stated, and then the
corn should be dusted with a mixture of boric acid and zinc oxide,
equal parts, and the toes kept apart by pads of absorbent cotton.

=CALLUS AND CRACKS OF THE SKIN.=--Callus consists of round or
irregular, flattened, yellowish thickenings of the upper or horny
layer of the skin. The skin becomes hypertrophied and resembles a
thick, horny layer, caused by intermittent pressure of tools, shoes,
etc. The whole palm of the hand or soles of the feet may be the seats
of a continuous callus. Callus is not harmful, except in leading to
cracks of the skin near the bend of joints, and, rarely, in causing
irritation, heat, pain, and even the formation of pus in the skin
beneath. Callus usually disappears when the exciting cause or pressure
is removed.

=Treatment.=--The hands and feet should be soaked continuously in hot
baths containing washing soda, and then should be covered with
diachylon (or other) ointment. This may be done each night; or