of the abdomen and diaphragm are brought into motion by association with
those of the sphincter and rectum.

* * * * *

SECT. XII.

OF STIMULUS, SENSORIAL EXERTION, AND FIBROUS CONTRACTION.

I. Of fibrous contraction. 1. _Two particles of a fibre cannot approach
without the intervention of something, as in magnetism, electricity,
elasticity. Spirit of life is not electric ether. Galvani's
experiments._ 2. _Contraction of a fibre._ 3. _Relaxation succeeds._ 4.
_Successive contractions, with intervals. Quick pulse from debility,
from paucity of blood. Weak contractions performed in less time, and
with shorter intervals._ 5. _Last situation of the fibres continues
after contraction._ 6. _Contraction greater than usual induces pleasure
or pain._ 7. _Mobility of the fibres uniform. Quantity of sensorial
power fluctuates. Constitutes excitability._ II. Of sensorial exertion.
1. _Animal motion includes stimulus, sensorial power, and contractile
fibres. The sensorial faculties act separately or conjointly. Stimulus
of four kinds. Strength and weakness defined. Sensorial power
perpetually exhausted and renewed. Weakness from defect of stimulus.
From defect of sensorial power, the direct and indirect debility of Dr.
Brown. Why we become warm in Buxton bath after a time, and see well
after a time in a darkish room. Fibres may act violently, or with their
whole force, and yet feebly. Great exertion in inflammation explained.
Great muscular force of some insane people._ 2. _Occasional
accumulation of sensorial power in muscles subject to constant
stimulus. In animals sleeping in winter. In eggs, seeds, schirrous