art weakened, and that of the
capillaries increased? Is it because the mobility of the heart is less than
that of the stomach, and the mobility of the capillaries greater? Or is it
because the association between the muscular fibres of the stomach and
those of the heart have been uniformly associated by direct sympathy; and
the capillaries of the stomach and those of the skin have been more
frequently associated by reverse sympathy?

Where the actions of the stomach have been previously exhausted by long
stimulus, as on the day after intoxication, little or no accumulation of
sensorial power occurs, during the torpor of the organ, beyond what is
required to replace the deficiency of it, and hence fever seldom follows
intoxication. And a repetition of the stimulus sometimes becomes necessary
even to induce its natural action, as in dram-drinkers.

Where there has been no previous exhaustion of sensorial power, and the
primary link of associate motions is violently actuated by the sensorial
power of sensation, the secondary link is also violently actuated by direct
sympathy, as in inflammatory fevers. Where however the sensorial power of
the system is less than natural, the secondary link of associated motions
becomes torpid by reverse sympathy, as in the inoculated small-pox during
the eruption on the face the feet are frequently cold.

G. _Associations affected four Ways._

Hence associated trains or circles of motions may be affected four
different ways. 1. By the greater or less energy of action of the first
link with which they are catenated, and from which they take their names;
as irritative, sensitive, or voluntary associations. 2. By being excited by
two or more sensorial powers at the same time, as by irritation and
association, as in the instance of the application of the stimulus of
increased external heat to the cutaneous capillaries. 3. By catenation with
other sensorial powers, as with pain or pleasure, which are in this case
not the proximate cause of motion, but which, by becoming a link of
catenation, excites the sensorial power of association into action; as the
pain at the neck of the gall-bladder occasioned by a gall-stone is
transferred to the other end of that canal, and becomes a link of
catenation between the action of the two extremities of it. 4. The
influence of ethereal fluids, as of heat and gravitation. To which last
perhaps might be added moisture and oxygen gas as constituting necessary