ain
recurs, till a few drops of blood issue from the nostrils. As one grain of
turpeth mineral (vitriolic calx of mercury) mixed with ten grains of fine
sugar. Euphorbium or cayan pepper mixed with sugar, and used with caution
as an errhine. See the M. M. of the next Species.

8. _Hemicrania._ Pain on one side of the head. This disease is attended
with cold skin, and hence whatever may be the remote cause, the immediate
one seems to be want of stimulus, either of heat or distention, or of some
other unknown stimulus in the painful part; or in those, with which it is
associated. The membranes in their natural state are only irritable by
distention; in their diseased state, they are sensible like muscular
fibres. Hence a diseased tooth may render the neighbouring membranes
sensible, and is frequently the cause of this disease.

Sometimes the stomach is torpid along with the pained membrane of the head;
and then sickness and inappetency attends either as a cause or consequence.
The natural cure of hemicrania is the accumulation of sensorial power
during the rest or sickness of the patient. Mrs. ---- is frequently liable
to hemicrania with sickness, which is probably owing to a diseased tooth;
the paroxysm occurs irregularly, but always after some previous fatigue, or
other cause of debility. She lies in bed, sick, and without taking any
solid food, and very little of fluids, and those of the aqueous kind, and,
after about 48 or 50 hours, rises free from complaint. Similar to this is
the recovery from cold paroxysms of fever, from the torpor occasioned by
fear, and from syncope; which are all owing to the accumulation of
sensorial power during the inactivity of the system. Hence it appears,
that, though when the sensorial power of volition is much exhausted by
fatigue, it can be restored by eight or ten hours of sleep; yet, when the
sensorial power of irritation is exhausted by fatigue, that it requires two
whole solar or lunar days of rest, before it can be restored.

The late Dr. Monro asserted in his lectures, that he cured the hemicrania,
or megrim, by a strong vomit, and a brisk purge immediately after it. This
method succeeds best if opium and the bark are given in due quantity after
the operation of the cathartic; and with still more certainty, if bleeding
in small quantity is premised, where the pulse will admit of it. See Sect.
XXXV. 2. 1.

The pain generally affects one eye, and spreads a little way on that side