exertion to compare or
consider their present importance or their future consequence; the pleasure
is liable to rise into pain; that is, the ideas or sensual motions become
exerted too violently for want of some antithetistic ideas; in the same
manner as those muscles, which have weak antagonists, as those of the calf
of the leg, are liable to fall into cramp or painful contraction. In this
situation a scream is begun to relieve this pain of ideas too violently
exerted, which is stopped again soon, as explained in Sect. XXXIV. 1. 4.
and Class III. 1. 1. 4. and IV. 2. 3. 3.

The pain, into which this pleasure rises, which would excite the scream of
laughter, has been felt forcibly by every one; when they have been under
such circumstances, as have induced them to restrain it by a
counter-volition; till at length the increased associate motions produce so
much pain as to overcome the counter-volition, and the patient bursts out
into indecent laughter, contrary to his will in the common acceptation of
that word.

4. _Lusus digitorum invitus._ An awkward playing with the fingers in
speaking in public. These habits are began through bashfulness, and seem
rather at first designed to engage the attention in part, and thus prevent
the disagreeable ideas of mauvaise hont; as timorous boys whistle, when
they are obliged to walk in the dark; and as it is sometimes necessary to
employ raw soldiers in perpetual manoeuvres, as they advance to the first
charge.

5. _Unguium morsiuncula invita._ Biting the nails is a depraved habit
arising from similar causes as those of the last article.

M. M. Dip the fingers in solution of aloes.

6. _Vigilia invita._ Watchfulness, where the person wishes, and endeavours
to fall asleep, properly belongs to this place, as the wish or volition to
sleep prevents the desired effect; because sleep consists in an abolition
of volition. See Class III. 1. 2. 3.

* * * * *

ORDO I.

_Increased Associate Motions._

GENUS IV.

_Catenated with External Influences._

SPECIES.

1. _Vita ovi._ Life of an egg. The eggs of fowls were shewn by Mr. J.
Hunter to resist the freezing process in their living state more
powerfully, than when they were killed by having the yolk and white shook
together. Philos. Trans. It may be asked, does the heat during the
incubation of eggs act as a stimulus exciting the living principle into
activity? Or does it act simply as a causa sine