of irritation during their previous torpid state, as in the
febris irritata above described; but which is afterwards supported or
continued by the reverse sympathy of these capillaries with the torpid
state of the heart and arteries, as will be further explained in article 8
of this Supplement.

4. The renovated activity of the capillaries commences as soon or sooner
than that of the heart and arteries after the cold fit of irritative fever;
and is not owing to their being forced open by the blood being impelled
into them mechanically, by the renovated action of the heart and arteries;
for these capillaries of the skin have greater mobility than the heart and
arteries, as appears in the sudden blush of shame; which may be owing to
their being more liable to perpetual varieties of activity from their
exposure to the vicissitudes of atmospheric heat. And because in
inirritative fevers, or those with arterial debility, the capillaries
acquire increased strength, as is evinced by the heat of the skin, while
the pulsations of the heart and arteries remain feeble.

5. It was said above, that the cutaneous capillaries, when they were
rendered torpid by exposure to cold, either recovered their activity by the
reapplication of external warmth; or by their increased irritability, which
is caused by the accumulation of that sensorial power during their
quiescence. An example of the former of these may be seen on emerging from
a very cold bath; which produces a fit of simple fever; the cold fit, and
consequent hot fit, of which may be prolonged by continuing in the bath;
which has indeed proved fatal to some weak and delicate people, and to
others after having been much exhausted by heat and exercise. See Sect.
XXXII. 3. 2. An example of the latter may be taken from going into a bath
of about eighty degrees of heat, as into the bath at Buxton, where the
bather first feels a chill, and after a minute becomes warm, though he
remains in the same medium, owing to the increase of irritability from the
accumulation of that sensorial power during the short time, which the
chilness continued.

6. Hence simple fevers are of two kinds; first, the febris irritativa, or
fever with strong pulse; which consists of a previous torpor of the heart,
arteries, and capillaries, and a succeeding orgasm of those vessels.
Secondly, the febris inirritativa, or fever with weak pulse, which consists
of a previous torpor of the heart, arteries, and capilla