ided into two varieties alluding to the remote cause of
each, and may be termed sitis calida, or warm thirst, and sitis frigida, or
cold thirst. The remote cause of the former arises from the dissipation of
the aqueous parts of our fluids by the increased secretion of perspirable
matter, or other evacuations. And hence it occurs in hot fits of fever, and
after taking much wine, opium, spice, salt, or other drugs of the Art.
incitantia or secernentia. The thirst, which occurs about three hours after
eating a couple of red herrings, to a person unaccustomed to salted meat,
is of this kind; the increased action of the cutaneous vessels dissipates
so much of our fluids by insensible perspiration, as to require above two
quarts of water to restore the fluidity of the blood, and to wash the salt
out of the system. See Art. III. 2. 1.

M. M. Cold water. Vegetable acids. Warm bath.

The remote cause of sitis frigida, or cold thirst, is owing to the inaction
of the cutaneous, pulmonary, urinary, and cellular absorbents; whence the
blood is deprived of the great supply of moisture, which it ought to
receive from the atmosphere, and from the cells of the cellular membrane,
and from other cysts; this cause of thirst exists in dropsies, and in the
cold fits of intermittents. The desire of fluids, like that of solids, is
liable to acquire periods, and may therefore readily become diseased by
indulgence in liquids grateful to the palate.

Of diseased thirst, the most common is either owing to defect of the action
of the numerous absorbent vessels on the neck of the bladder, in which the
patient makes much paleish water; or to the defective absorption of the
skin and lungs, in which the patient makes but little water, and that
high-coloured, and with sediment. In both the tongue and lips are liable to
become very dry. The former in its greatest degree attends diabaetes, and
the latter anasarca.

M. M. Warm water, warm wine, warm bath. Opium. Cold bath. Iced water.
Lemonade. Cyder.

2. _Esuries._ Hunger has been fancifully ascribed to the sides of the
stomach rubbing against each other, and to the increased acidity of the
gastric juice corroding the coats of it. If either of these were the cause
of hunger, inflammation must occur, when they had continued some time; but,
on the contrary, coldness and not heat are attendant on hunger; which
evinces, that like thirst it is owing to the inactivity of the membrane,
which is the seat of i