sensitive fevers. Size
of the blood. Nervous fevers distinguished from putrid ones. The septic
and antiseptic theory._ 4. _Two kinds of delirium._ 5. _Other animals
are less liable to delirium, cannot receive our contagious diseases,
and are less liable to madness._ II. 1. _Sensitive motions generated._
2. _Inflammation explained._ 3. _Its remote causes from excess of
irritation, or of irritability, not from those pains which are owing to
defect of irritation. New vessels produced, and much heat._ 4.
_Purulent matter secreted._ 5. _Contagion explained._ 6. _Received but
once._ 7. _If common matter be contagious?_ 8. _Why some contagions are
received but once._ 9. _Why others may be received frequently.
Contagions of small-pox and measles do not act at the same times. Two
cases of such patients._ 10. _The blood from patients in the small-pox
will not infect others. Cases of children thus inoculated. The
variolous contagion is not received into the blood. It acts by
sensitive association between the stomach and skin._ III. 1.
_Absorption of solids and fluids._ 2. _Art of healing ulcers._ 3.
_Mortification attended with less pain in weak people._

I. 1. As many motions of the body are excited and continued by irritations,
so others require, either conjunctly with these, or separately, the
pleasurable or painful sensations, for the purpose of producing them with
due energy. Amongst these the business of digestion supplies us with an
instance: if the food, which we swallow, is not attended with agreeable
sensation, it digests less perfectly; and if very disagreeable sensation
accompanies it, such as a nauseous idea, or very disgustful taste, the
digestion becomes impeded; or retrograde motions of the stomach and
oesophagus succeed, and the food is ejected.

The business of generation depends so much on agreeable sensation, that,
where the object is disgustful, neither voluntary exertion nor irritation
can effect the purpose; which is also liable to be interrupted by the pain
of fear or bashfulness.

Besides the pleasure, which attends the irritations produced by the objects
of lust and hunger, there seems to be a sum of pleasurable affection
accompanying the various secretions of the numerous glands, which
constitute the pleasure of life, in contradistinction to the tedium vitae.
This quantity or sum of pleasurable affection, seems to contribute to the
due