na and glycerine, equal parts, may be used.

Dry cold obtained by means of icebags, or by Leiter's lead tubes through
which a continuous stream of ice-cold water is kept flowing, is
sometimes soothing to the patient, but when the vessels in the inflamed
part are greatly congested its use is attended with considerable risk,
as it not only contracts the arterioles supplying the part, but also
diminishes the outflow of venous blood, and so may determine gangrene of
tissues already devitalised.

A milder form of employing cold is by means of evaporating lotions: a
thin piece of lint or gauze is applied over the inflamed part and kept
constantly moist with the lotion, the dressing being left freely exposed
to allow of continuous evaporation. A useful evaporating lotion is made
up as follows: take of chloride of ammonium, half an ounce; rectified
spirit, one ounce; and water, seven ounces.

The administration of opiates may be necessary for the relief of pain.

The accumulation of an excessive amount of inflammatory exudate may
endanger the vitality of the tissues by pressing on the blood vessels to
such an extent as to cause stasis, and by concentrating the local action
of the toxins. Under such conditions the tension should be relieved and
the exudate with its contained toxins removed by making an incision into
the inflamed tissues, and applying a suction bell. When the exudate has
collected in a synovial cavity, such as a joint or bursa, it may be
withdrawn by means of a trocar and cannula. There are other methods of
withdrawing blood and exudate from an inflamed area, for example by
leeches or wet-cupping, but they are seldom employed now.

Before applying leeches the part must be thoroughly cleansed, and if
the leech is slow to bite, may be smeared with cream. The leech is
retained in position under an inverted wine-glass or wide test-tube till
it takes hold. After it has sucked its fill it usually drops off, having
withdrawn a dram or a dram and a half of blood. If it be desirable to
withdraw more blood, hot fomentations should be applied to the bite. As
it is sometimes necessary to employ considerable pressure to stop the
bleeding, leeches should, if possible, be applied over a bone which will
furnish the necessary resistance. The use of styptics may be called for.

_Wet-cupping_ has almost entirely been superseded by the use of Klapp's
suction bells.

_General blood-letting_ consists in opening a superficial vei