of the cutaneous lymphatics being suddenly
exposed to cold become torpid, and cease, or nearly cease, to act; whilst,
by the sympathy above described, not only the lymphatics of the bladder and
intestines cease also to absorb the more aqueous and saline part of the
fluids secreted into them; but it is probable that these lymphatics invert
their motions, and return the fluids, which were previously absorbed, into
the intestines and bladder. At the very instant that the body is exposed
naked to the cold air, an unusual movement is felt in the bowels; as is
experienced by boys going into the cold bath: this could not occur from an
obstruction of the perspirable matter, since there is not time, for that to
be returned to the bowels by the course of the circulation.

There is also a chronic aqueous diarrhoea, in which the atmospheric
moisture, drank up by the cutaneous and pulmonary lymphatics, is poured
into the intestines, by the retrograde motions of the lacteals. This
disease is most similar to the aqueous diabetes, and is frequently
exchanged for it: a distinct instance of this is recorded by Benningerus,
Cent. v. Obs. 98. in which an aqueous diarrhoea succeeded an aqueous
diabetes, and destroyed the patient. There is a curious example of this,
described by Sympson (De Re Medica)--"A young man (says he) was seized with
a fever, upon which a diarrhoea came on, with great stupor; and he refused
to drink any thing, though he was parched up with excessive heat: the
better to supply him with moisture, I directed his feet to be immersed in
cold water; immediately I observed a wonderful decrease of water in the
vessel, and then an impetuous stream of a fluid, scarcely coloured, was
discharged by stool, like a cataract."

7. There is another kind of diarrhoea, which has been called caeliaca; in
this disease the chyle, drank up by the lacteals of the small intestines,
is probably poured into the large intestines, by the retrograde motions of
their lacteals: as in the chyliferous diabetes, the chyle is poured into
the bladder, by the retrograde motions of the urinary branch of absorbents.

The chyliferous diabetes, like this chyliferous diarrhoea, produces sudden
atrophy; since the nourishment, which ought to supply the hourly waste of
the body, is expelled by the bladder, or rectum: whilst the aqueous
diabetes, and the aqueous diarrhoea produce excessive thirst; because the
moisture, which is obtained from the atmosphere, is no