prevention of blisters are; hardening of the skin by appropriate baths
for the feet; soaping the feet; or adopting some other means of
reducing the friction of the foot against the sock. _Treatment_--Wash
the feet; open the blister at the lowest point, with a clean needle;
dress with vaseline or other ointment and protect with adhesive
plaster, care being taken not to shut out the air. Zinc oxide plaster
is excellent. Sterilize a needle; thread it with a woolly thread and
run it through blister, leaving ends projecting about one-half inch;
this will act as a wick and dry up blister in short time.

FIRST AID.--Explain to the men the uses of the first aid packet and of
the pouch carried by the Medical Corps. (This pouch is being replaced
by web-belts with pockets.)

WOUNDS may be classed as ordinary cuts, inside wounds, lacerated,
punctured and poisoned wounds. For ordinary minor wounds--iodine and
exposure to the air are usually sufficient. _War wounds_ are usually
caused by something having an explosive effect and may be accompanied
by hemorrhage, shock and even loss of function; they may be arterial
or venous.

POISONED WOUNDS are of two sorts; external and internal.

DIAGNOSIS TAG.--This tag placed on a soldier shows wound, name, rank,
regiment, treatment received, etc. This tag should be carefully read
before further treatment is accorded.

TREATMENT OF WOUNDS.--The compress, of the first aid packet will
always prove of help.