hich thus continue to spread; or as when variolous matter is inserted
beneath the cuticle; or when it is supposed to be absorbed, and diffused
over the body mixed with the blood, and applied in that manner to the
cutaneous glands. The other way, by which contagion seems to be diffused,
is by some distant parts sympathizing or imitating the motions of the part
first affected; as the stomach and skin in the eruptions of the inoculated
small-pox, or in the bite of a mad dog; as treated of in Sect. XXII. 3. 3.

In some of the diseases of this genus the pulse is strong, full, and hard,
constituting the sensitive irritated fever, as described in the preceding
genus; as in one kind of erysipelas, which requires repeated venesection.
In others the arterial action is sometimes moderate, so as to constitute
the sensitive fever, as in the inoculated small-pox; where the action of
the arteries is neither increased by the sensorial power of irritation, as
in the sensitive irritated fever; nor decreased by the defect of that
power, as in the sensitive inirritated fever. But in the greatest number of
the diseases of this genus the arterial action is greatly diminished in
respect to strength, and consequently the frequency of pulsation is
proportionally increased, as explained in Sect XXXII. 2. 1. Which is owing
to the deficiency of the sensorial power of irritation joined with the
increase of that of sensation, and thus constitutes the sensitive
inirritated fever; as in Scarlatina with gangrenous tonsils.

From this great debility of the action of the arteries, there appears to be
less of the coagulable lymph or mucus secreted on their internal surfaces;
whence there is not only a defect of that buff or size upon the blood,
which is seen on the surface of that, which is drawn in the sensitive
irritated fever; but the blood, as it cools, when it has been drawn into a
bason, scarcely coagulates; and is said to be dissolved, and is by some
supposed to be in a state of actual putrefaction. See Sect. XXXIII. 1. 3.
where the truth of this idea is controverted. But in the fevers of both
this genus and the preceding one great heat is produced from the chemical
combinations in the secretions of new vessels and fluids, and pain or
uneasiness from the distention of the old ones; till towards the
termination of the disease sensation ceases, as well as irritation, with
the mortification of the affected parts, and the death of the patient.

Dysente