r cloud is mucous; the opake sediment is probably
coagulable lymph from the blood changed by an animal or chemical process.
The floating scum is oil. The angular concretions to the sides of the pot,
formed as the urine cools, is microcosmic salt. Does the adhesive blue
matter on the sides of the glass, or the blue circle on it at the edge of
the upper surface of the urine, consist of Prussian blue?

5. _Diarrhoea calida._ Warm diarrhoea. This species may be divided into
three varieties deduced from their remote causes, under the names of
diarrhoea febrilis, diarrhoea crapulosa, and diarrhoea infantum. The
febrile diarrhoea appears at the end of fever-fits, and is erroneously
called critical, like the copious urine, and the sweats; whereas it arises
from the increased action of those secerning organs, which pour their
fluids into the intestinal canal (as the liver, pancreas, and mucous
glands), continuing longer than the increased action of the intestinal
absorbents. In this diarrhoea there is no appearance of curdled chyle in
the stools, as occurs in cholera. I. 3. 1. 5.

The _diarrhoea crapulosa_, or diarrhoea from indigestion, occurs when too
great a quantity of food or liquid has been taken; which not being
compleatly digested, stimulates the intestines like any other extraneous
acrid material; and thus produces an increase of the secretions into them
of mucus, pancreatic juice, and bile. When the contents of the bowels are
still more stimulant, as when drastic purges, or very putrescent diet, have
been taken, a cholera is induced. See Sect. XXIX. 4.

The _diarrhoea infantum_, or diarrhoea of infants, is generally owing to
too great acidity in their bowels. Milk is found curdled in the stomachs of
all animals, old as well as young, and even of carnivorous ones, as of
hawks. (Spallanzani.) And it is the gastric juice of the calf, which is
employed to curdle milk in the process of making cheese. Milk is the
natural food for children, and must curdle in their stomachs previous to
digestion; and as this curdling of the milk destroys a part of the acid
juices of the stomach, there is no reason for discontinuing the use of it,
though it is occasionally ejected in a curdled state. A child of a week
old, which had been taken from the breast of its dying mother, and had by
some uncommon error been suffered to take no food but water-gruel, became
sick and griped in twenty-four hours, and was convulsed on the second day,
and d