not only on the
present or previous plus or minus of the sensorial power of association,
but also on the introduction of other kinds of sensorial power, as in Class
IV. 1. 1. D; or the increased production of it in the brain, or the greater
mobility of one part of a train of actions than another.

Thus when much food or wine is taken into the stomach, if there be no
superfluity of sensorial power in the system, that is, none to be spared
from the continual actions of it, a paleness and chillness succeeds for a
time; because now the expenditure of it by the increased actions of the
stomach is greater than the present production of it. In a little time
however the stimulus of the food and wine increases the production of
sensorial power in the brain, and this produces a superfluity of it in the
system; in consequence of which the skin now becomes warm and florid, which
was at first cold and pale; and thus the reverse sympathy is shortly
converted into a direct one; which is probably owing to the introduction of
a second sensorial power, that of pleasurable sensation.

On the contrary, when an emetic drug produces sickness, the skin is at
first pale for a time by direct sympathy with the capillaries of the
stomach; but in a few minutes, by the accumulation of sensorial power in
the stomach during its less active state in sickness, the capillaries of
the skin, which are associated with those of the stomach, act with greater
energy by reverse sympathy, and a florid colour returns. Where the quantity
of action is diminished in the first part of a train of motions, whether by
previous diminution of sensorial power, or present diminution of stimulus,
the second part of the train becomes torpid by direct sympathy. And when
the quantity of action of the first part becomes increased by the
accumulation of sensorial power during its previous torpor, or by increase
of stimulus, the actions of the second part of it likewise become increased
by direct sympathy.

In moderate hunger the skin is pale, as before dinner, and in moderate
sickness, as no great accumulation of sensorial power has commenced; but in
violent hunger, and in greater torpor of the stomach, as from contagious
matter, the accumulation of sensorial power becomes so great as to affect
the arterial and capillary system, and fever is produced in both cases.

In contagious fevers with arterial debilities commencing with torpor of the
stomach, why is the action of the he