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Updated: May 8, 2025
At night the pupil dilates more than in the day-time, and hence vision with the extramacular or peripheral portions of the retina is correspondingly better. It is, therefore, a symptom of serious retinal disease.
Numerous and well-known physiological researches, especially those of Mosso, show that all intellectual, and, most of all, emotional, work, produces cerebral congestion; that the brain-volume increases, and the volume of the peripheral organs diminishes. But that tells us nothing particularly about the imagination, which is but a special case under the rule.
Important also is the relation to the circulatory system, especially the disturbances of the heart: innervation may be corrected, abnormal dilations and contractions of blood-vessels may be regulated. The bladder, uterus, even the pancreas and the liver seem to be influenced by the peripheral effects of the central excitement.
Scientific men themselves will cheat at public lectures rather than let experiments obey their well-known tendency towards failure. I have heard of a lecturer on physics, who had taken over the apparatus of the previous incumbent, consulting him about a certain machine intended to show that, however the peripheral parts of it might be agitated, its centre of gravity remained immovable.
Roman civilization under the Caesars was a centralized absolutism with a large measure of peripheral deviation and autonomy.
Being funnel-shaped, as analogy warrants us in assuming, its central parts will be much deeper than its peripheral parts, and therefore more opaque. This, too, corresponds with observation. Mr.
The central portion comprises the brain or encephalon and the spinal cord. These organs are lodged in the cranial cavity and spinal canal. The nerves and ganglia comprise the peripheral portion. The nerves form white cords that are made up of nerve fibres.
Moreover, it is plain that this increase in the strength of the excitation will involve an extension of the area of excitation till, by-and-by, the peripheral regions of the nervous system may be involved just as in the case of external stimulation. This accounts for the gradual displacement of the impression of the moment by the mental image.
The two layers are stitched together by threads carried round the hat in concentric circles at intervals of about one inch. The peripheral edges are sewn to a slender strip of rattan bent to form a circle, the two ends overlapping. The hats hung upon the tombs are decorated on the upper surface with bold designs painted in black and red.
The theory of the origin of sleep which has gained the widest credence is the one that attributes it to anæmia of the brain. It has been shown by Mosso, and many others, that in men with defects of the cranial wall the volume of the brain decreases during sleep. At the same time, the volume of any limb increases as the peripheral parts of the body become turgid with blood.
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