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on sleep and sleeplessness-第4部分
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carried up by the heat to the region of the brain; is condensed into a
'phlegm' (which explains why catarrhs are seen to proceed from the
head); while that evaporation which is nutrient and not unwholesome;
becoming condensed; descends and cools the hot。 The tenuity or
narrowness of the veins about the brain itself contributes to its
being kept cool; and to its not readily admitting the evaporation。
This; then; is a sufficient explanation of the cooling which takes
place; despite the fact that the evaporation is exceedingly hot。
A person awakes from sleep when digestion is completed: when the
heat; which had been previously forced together in large quantity
within a small compass from out the surrounding part; has once more
prevailed; and when a separation has been effected between the more
corporeal and the purer blood。 The finest and purest blood is that
contained in the head; while the thickest and most turbid is that in
the lower parts。 The source of all the blood is; as has been stated
both here and elsewhere; the heart。 Now of the chambers in the heart
the central communicates with each of the two others。 Each of the
latter again acts as receiver from each; respectively; of the two
vessels; called the 'great' and the 'aorta'。 It is in the central
chamber that the 'above…mentioned' separation takes place。 To go
into these matters in detail would; however; be more properly the
business of a different treatise from the present。 Owing to the fact
that the blood formed after the assimilation of food is especially
in need of separation; sleep 'then especially' occurs 'and lasts'
until the purest part of this blood has been separated off into the
upper parts of the body; and the most turbid into the lower parts。
When this has taken place animals awake from sleep; being released
from the heaviness consequent on taking food。 We have now stated the
cause of sleeping; viz。 that it consists in the recoil by the
corporeal element; upborne by the connatural heat; in a mass upon
the primary sense…organ; we have also stated what sleep is; having
shown that it is a seizure of the primary sense…organ; rendering it
unable to actualize its powers; arising of necessity (for it is
impossible for an animal to exist if the conditions which render it an
animal be not fulfilled); i。e。 for the sake of its conservation; since
remission of movement tends to the conservation of animals。
…THE END…
。
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