he accumulation of the sensorial
power of association in this case, as the accumulation of that of
irritation in the former, becomes so abundant as to excite into increased
action the parts most nearly connected, as the cutaneous capillaries.

In respect to the circumstance mentioned by Sydenham, that covering the
head in bed in a short time relieved the pertinacious sickness of the
patient, it must be observed, that when the action of the heart and
arteries become weakened by the want of the due stimulus of the proper
quantity of oxygen in the blood, that an accumulation of the sensorial
power of irritation occurs in the fibres of the heart and arteries, which
then is expended on those of the capillary glands, increasing their actions
and consequent secretions and heat. And then the stomach is thrown into
stronger action, both by the greater excitement of its natural quantity of
the sensorial power of association by the increased actions of the
capillaries, and also by some increase of associability, as it had been
previously a long time in a state of torpor, or less activity than natural,
as evinced by its perpetual sickness.

In a manner somewhat similar to this, is the redness of the skin produced
in angry people by the superabundance of the unemployed sensorial power of
volition, as explained in Class IV. 2. 3. 5. Rubor ex ira. From hence we
learn how, when people in fevers with weak pulse, or in dropsies, become
insane, the abundance of the unemployed sensorial power of volition
increases the actions of the whole moving system, and cures those diseases.

7. As the orgasm of the capillaries in fevers with weak pulse is
immediately caused by the torpid actions of the heart and arteries, as
above explained, this supplies us with another indication of cure in such
fevers, and that is to stimulate these organs. This may probably be done by
some kind of medicines, which are known to pass into the blood unchanged in
some of their properties. It is possible that nitre, or its acid, may pass
into the blood and increase the colour of it, and thus increase its
stimulus, and the same may be supposed of other salts, neutral or metallic?
As rubia tinctoria, madder, colours the bones of young animals, it must
pass into the blood with its colouring matter at least unchanged, and
perhaps many other medicines may likewise affect the blood, and thus act by
stimulating the heart and arteries, as well as by stimulating the stomach;
w