ceeds for a greater or less length of time; as no accumulation of the
sensorial power of irritation can occur, till the natural quantity, which
has been previously expended, is first restored. Then the heart and
arteries which are next in catenation, become less active from the want of
sufficient excitement of the sensorial power of association, which
previously contributed to actuate them. This sensorial power of association
therefore becomes accumulated, and by its superabundance contributes to
actuate the link next in association, which has thus acquired so great a
degree of associability, as to overbalance the less quantity of the
excitement of it by the torpid action of the previous or first associate
link. This happens to the capillaries, when the heart and arteries are
affected as above by the torpor of the stomach, when it is occasioned by
previous great expenditure of its sensorial power, and thus constitutes
fever with weak pulse, which is here termed inirritative fever, typhus
mitior.

5. When a deficiency of stimulus is too great or too long continued, so as
to impair the life of the part, no further accumulation of sensorial power
occurs; as when the skin is long exposed to cold and damp air. In that case
the link in catenation, that is, the first of the associate train, is
rendered torpid by defect of excitement of its usual quantity of the
sensorial power of association, and from there being no accumulation of the
sensorial power of irritation to increase its associability, and thus to
contribute to actuate it by overbalancing the defect of the excitement of
its association.

Thus on riding long and slowly on a cold and damp day, the exhalation of
the vapour, which is impinged on the skin, as the traveller proceeds,
carries away his warmth faster, than it is generated within the system; and
thus the capillaries of the skin have their actions so much impaired after
a time, that no accumulation of the sensorial power of irritation occurs;
and then the stomach, whose motions are catenated with those of the
capillaries, ceases to act from the deficient excitement of the power of
association; and indigestion and flatulency succeed, instead of the
increased digestion and hunger, which occur, when the cutaneous capillaries
are exposed to a less degree of cold, and for a shorter time. In which
latter situation the accumulation of the sensorial power of irritation
increases by its superabundance the associability