early connected with it, into great increase
of action; as is known by the great quantity frequently in these situations
rejected by vomit, which could not otherways be supplied. It is probable
the increase of digestion by walking in frosty air, with many other animal
facts, may by future observations be found to be dependent on this
principle, as well as the increased action of the capillaries in continued
fevers with weak pulse.

Whereas in continued fever with strong pulse, which may perhaps occur
sometimes on the first day even of the plague, the stomach with the heart
and arteries and the capillaries act by direct sympathy; that is, the
stomach is excited into stronger action by increased irritation owing to
the stimulus of contagious matter; these stronger irritative motions of the
stomach excite a greater quantity of the sensorial power of association,
which then actuates the heart and arteries with greater energy, as these
are catenated with the stomach; and in the same manner the increased
actions of the heart and arteries excite a greater quantity of the
sensorial power of association, which actuates the cutaneous capillaries
with increase of energy. See Class IV. 1. 1.

4. I shall dwell a little longer on this intricate subject. The
commencement of fever-fits is known by the inactivity of the cutaneous
capillaries, which inactivity is observable by the paleness and coldness of
the skin, and also by the pain of coldness, which attends it. There is
nevertheless in most cases, except those which are owing to exposure to
external cold, a torpor of the capillaries of some internal viscus
preceding this inactivity of the cutaneous capillaries; which is known, by
the tumour or hardness of the viscus, or by an aching pain of it. The
capillaries of the lungs are at the same time rendered inactive or torpid,
as appears by the difficulty of breathing, and coldness of the breath in
cold fits of fever, and in going into the cold bath; but the lungs are not
affected with the pain either of coldness or of torpor.

One cause of this synchronous or successive inactivity of the cutaneous
capillaries, in consequence of the previous torpor of some internal viscus,
may be owing to the deficiency of heat; which must occur, when any part
becomes inactive; because the secretions of that part cease or are
lessened, and the quantity of heat of it in consequence. But the principal
cause of it I suppose to be owing to the defect of the