he skin regain their
increased activity by the accumulation of the sensorial power of
irritation, these capillaries of the lungs act with greater energy also
owing to their accumulated sensorial power of association. These are
instances of direct sympathy, and constitute the cold and hot paroxysms of
intermittent fever; or the first paroxysm of a continued one.

3. When the first link of a train of associated motions, which is subject
to perpetual action, becomes a considerable time torpid for want of being
excited by the previous exertions of the irritative motions, with which it
is catenated; the sensorial power of association becomes accumulated in so
great a degree as to affect the second link of the train of associated
motions, and to excite it into stronger action. Thus when the stomach is
rendered torpid by contagious matter swallowed into it mixed with the
saliva, the heart and arteries act more feebly; because the sensorial power
of association, which used to be excited by the fibrous motions of the
stomach, is not now excited; and in consequence the motions of the heart
and arteries act only by the sensorial power of irritation, which is
excited by the stimulus of the blood.

But during this torpor of the stomach, and less action of the heart and
arteries, so great an accumulation of the sensorial powers of irritation
and of association occurs, that it adds to the action of the next link of
this vital circle of actions, that is, to that of the cutaneous
capillaries. Whence in this situation the torpor of the stomach occasions a
diminished action of the heart and arteries by direct sympathy, and may be
said to occasion an increased one of the cutaneous capillaries by reverse
sympathy; which constitute continued fever with weak pulse.

Nor is this increased action of the capillaries in consequence of the
decreased action of the heart and arteries, as in fevers with weak pulse, a
single fact in the animal economy; though it exists in this case in the
greatest degree or duration, because the heart and arteries are perpetually
in greater action than any other part of the system. But a similar
circumstance occurs, when the stomach is rendered inactive by defective
excitement of the sensorial power of association, as in sea-sickness, or in
nephritis. In these cases the sensorial power of association becomes much
accumulated in the stomach, and seems by its superabundance to excite the
absorbent system, which is so n