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Updated: June 1, 2025
Delicate, hair-like filaments, not unlike the pile on velvet, called cilia, spring from the epithelial lining of the air tubes. Their constant wavy movement is always upwards and outwards, towards the mouth. Thus any excessive secretion, as of bronchitis or catarrh, is carried upwards, and finally expelled by coughing.
The protoplasm of Algæ and Fungi becomes, under many circumstances, partially, or completely, freed from its woody case, and exhibits movements of its whole mass, or is propelled by the contractility of one, or more, hair-like prolongations of its body, which are called vibratile cilia.
Above are the organs divided by delicate tissues; below are the intestines artistically curved in a spiral form, and each tier covered by a delicate network of blood-vessels standing out red against the faint blue background. Each branch of the blood-vessels is comprised of a trunk, bifurcating and rebifurcating into the most delicate, hair-like threads, symmetrically arranged.
But one day after a short, pelting rain, I came home and opened the door and looked at the moving, crawling walls, and could not believe my eyes. Worms small, brown, slick worms an inch to an inch and a half long. The walls, the door, the ground were alive with them. They were crawling through the cracks into the shack, wriggling along the floor and walls with their tiny, hair-like legs.
The wind was blowing from the northward of west, while the atmosphere was bright and clear, so that the horizon was extended to almost double its ordinary distance; but, although no land was to be seen anywhere in sight, myriads of little winged insects began all at once to hover over us, just as if we were close in shore under the lee of some tropical forest, while our hands, clothes, faces, and the ship's rigging as well, began to be covered with long, white, hair-like webs, similar to those woven by spiders in a garden shrubbery!
To evince this structure, the retina of an ox's eye was suspended in a glass of warm water, and forcibly torn in a few places; the edges of these parts appeared jagged and hairy, and did not contract, and become smooth like simple mucus, when it is distended till it breaks; which shews that it consists of fibres; and that its fibrous construction became still more distinct to the sight, by adding some caustic alkali to the water, as the adhering mucus was first eroded, and the hair-like fibres remained floating in the vessel.
He gazed down at her sunken grave; a little wind, that came stealing along the floor of the grove, raised and swayed the long, hair-like grass on it, giving the curious suggestion of something prisoned under it trying to draw a long breath and float upward. Then, when he lifted his eyes again, he saw her!
Within these eggs the young are formed, and they leave the egg in a condition which has no sort of resemblance to the perfect animal. It is, in fact, a minute oval body, many hundred times smaller than the full grown creature, and it swims about with great activity by the help of multitudes of little hair-like filaments, called cilia, with which its body is covered.
Upon examining into the matter it was found stopped up, wadded compactly with a mass of root-fibres, delicate and hair-like. How this stuff had gotten into the pipe was a puzzle for some little time; finally it was found that it had crept in through a crack that was almost invisible to the eye. A gum tree forty feet away had tapped the pipe and was drinking the water.
The nights were so much lighter, that the stars were scarcely to be seen, saving here and there an occasional hair-like line of fire, that seemed to sway a little, with the moon.
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