same time, but one of them resting or suspending its action
till that of the other ceases, may be much easier explained from
sympathetic or associated actions of the infected part with other parts of
the system, than it can from supposing the two contagions to enter the
circulation.

The skin of the face is subject to more frequent vicissitudes of heat and
cold, from its exposure to the open air, and is in consequence more liable
to sensitive association with the stomach than any other part of the
surface of the body, because their actions have been more frequently thus
associated. Thus in a surfeit from drinking cold water, when a person is
very hot and fatigued, an eruption is liable to appear on the face in
consequence of this sympathy. In the same manner the rosy eruption on the
faces of drunkards more probably arises from the sympathy of the face with
the stomach, rather than between the face and the liver, as is generally
supposed.

This sympathy between the stomach and the skin of the face is apparent in
the eruption of the small-pox; since, where the disease is in considerable
quantity, the eruption on the face first succeeds the sickness of the
stomach. In the natural disease the stomach seems to be frequently
primarily affected, either alone or along with the tonsils, as the matter
seems to be only diffused in the air, and by being mixed with the saliva,
or mucus of the tonsils, to be swallowed into the stomach.

After some days the irritative circles of motions become disordered by this
new stimulus, which acts upon the mucus lining of the stomach; and
sickness, vertigo, and a diurnal fever succeed. These disordered irritative
motions become daily increased for two or three days, and then by their
increased action certain sensitive motions, or inflammation, is produced,
and at the next cold fit of fever, when the stomach recovers from its
torpor, an inflammation of the external skin is formed in points (which
afterwards suppurate), by sensitive association, in the same manner as a
cough is produced in consequence of exposing the feet to cold, as described
in Sect. XXV. 17. and Class IV. 2. I. 7. If the inoculated skin of the arm,
as far as it appears inflamed, was to be cut out, or destroyed by caustic,
before the fever commenced, as suppose on the fourth day after inoculation,
would this prevent the disease? as it is supposed to prevent the
hydrophobia.

III. 1. Where the new vessels, and enlarged old on