n of sensorial power, is the cause of the general
debility, and sickness, and head-ach, some hours after intoxication. And
hence we see one of the causes of the periods of fever-fits; which however
are frequently combined with the periods of our diurnal habits, or of heat
and cold, or of solar or lunar periods.

When besides the tendency to quiescence occasioned by the expenditure of
sensorial power during the hot fit of fever, some other cause of torpor, as
the solar or lunar periods, is necessary to the introduction of a second
cold fit; the fever becomes of the intermittent kind; that is, there is a
space of time intervenes between the end of the hot fit, and the
commencement of the next cold one. But where no exteriour cause is
necessary to the introduction of the second cold fit; no such interval of
health intervenes; but the second cold fit commences, as soon as the
sensorial power is sufficiently exhausted by the hot fit; and the fever
becomes continual.

II. 1. The following are natural animal actions, which are frequently
catenated with our daily habits of life, as well as excited by their
natural irritations. The periods of hunger and thirst become catenated with
certain portions of time, or degrees of exhaustion, or other diurnal habits
of life. And if the pain of hunger be not relieved by taking food at the
usual time, it is liable to cease till the next period of time or other
habits recur; this is not only true in respect to our general desire of
food, but the kinds of it also are governed by this periodical habit;
insomuch that beer taken to breakfast will disturb the digestion of those,
who have been accustomed to tea; and tea taken at dinner will disagree with
those, who have been accustomed to beer. Whence it happens, that those, who
have weak stomachs, will be able to digest more food, if they take their
meals at regular hours; because they have both the stimulus of the aliment
they take, and the periodical habit, to assist their digestion.

The periods of emptying the bladder are not only dependent on the acrimony
or distention of the water in it, but are frequently catenated with
external cold applied to the skin, as in cold bathing, or washing the
hands; or with other habits of life, as many are accustomed to empty the
bladder before going to bed, or into the house after a journey, and this
whether it be full or not.

Our times of respiration are not only governed by the stimulus of the blood
in