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Updated: June 3, 2025
Death by drowning occurs when breathing is arrested by watery or semi-fluid substances blood, urine, etc. The fluid acts mechanically by entering the air-cells of the lung and preventing the due oxidation of the blood. Froth like that of soap-suds in the trachea is an indication of a vital act, and must not be mistaken for the tenacious mucus of bronchitis.
Some persons prepare bread for the oven by simply mixing it in the mass, without kneading, pouring it into pans, and suffering it to rise there. The air-cells in bread thus prepared are coarse and uneven; the bread is as inferior in delicacy and nicety to that which is well kneaded as a raw servant to a perfectly educated and refined lady.
Now every beat of the heart sends two ounces of blood into the minute, hair-like blood-vessels, called capillaries, that line these air-cells, where the air in the air-cells gives its oxygen to the blood, and in its place receives carbonic acid. This gas is then expired by the lungs into the surrounding atmosphere.
The air-cells are composed of a membrane which may be compared to the walls of the balloon, but we are of course dealing with living tissue supplied by countless blood-vessels of the most minute calibre, in which the blood is brought very near to the air which passes over them. Throughout, the respiratory tract is lined with mucous membrane.
While the terminations of the placental arteries and veins are spread in fine reticulation on the sides of these cells. And thus, as the growing fetus requires greater oxygenation, an apparatus is produced resembling exactly the air-cells of the lungs.
By lightness is meant simply that the particles are to be separated from each other by little holes or air-cells; and all the different methods of making light bread are neither more nor less than the formation in bread of these air-cells.
Only one lung was congested in the beginning, but, later, the thing extended to each, and the air-cells began filling, and the man suffered more and more. He fought against it fiercely. "Grant," said the doctor, after the administration of some strong stimulant, "help us all you can. Cough!
The bronchial tubes are the tree-like branches of the trachea, and extend to the air-cells themselves, which may be considered as built up around them in some such fashion as a toy balloon on its wooden stem, but with many infoldings, etc.
The snowy mass, perfectly mixed, kneaded with care and strength, rises in its beautiful perfection till the moment comes for fixing the air-cells by baking. A few minutes now, and the acetous fermentation will begin, and the whole result be spoiled. Many bread-makers pass in utter carelessness over this sacred and mysterious boundary.
Darwin attributes the lamination and fissile structure of volcanic rocks of the trachytic series, including some obsidians in Ascension, Mexico, and elsewhere, to their having moved when liquid in the direction of the laminae. The zones consist sometimes of layers of air-cells drawn out and lengthened in the supposed direction of the moving mass.
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