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Updated: June 3, 2025
While the blood is in these vessels it is not indeed in actual contact with the air, but is separated from it by only a very thin membrane so thin that it forms no hindrance to the interchange of gases. These air-cells are kept filled with air by simple muscular action.
As in beating cake, never stir ingredients into batter, but beat them in, by beating down from the bottom, and up, and over again. This laps the air into the batter which produces little air-cells and causes the dough to puff and swell as it comes in contact with the heat while cooking.
In the lava and in the scoriae of this little crater, I found several fragments, which, from their angular form, their granular structure, their freedom from air-cells, their brittle and burnt condition, closely resembled those fragments of primary rocks which are occasionally ejected, as at Ascension, from volcanoes.
Take these lungs, made up within of branching tubes, these in turn formed by myriads of air-cells, and each air-cell owning its network of minute cells called capillaries. To every air-cell is given a blood-vessel bringing blood from the heart, which finds its way through every capillary till it reaches another blood-vessel that carries it back to the heart.
The pulmonary artery receives the blood from the right chamber of the heart, and carries it to the minute extensive ramifications of the lungs, where it is exposed to the action of the air on a surface equal to that of the whole external skin, through the thin moist coats of those vessels, which are spread on the air-cells, which constitute the minute terminal ramifications of the wind-pipe.
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 Irish servant to a perfectly educated and refined lady.
There is, however, one species of yeast, much used in some parts of the country, against which I have to enter my protest. It is called salt-risings, or milk-risings, and is made by mixing flour, milk, and a little salt together and leaving them to ferment. The bread thus produced is often very attractive, when new and made with great care. It is white and delicate, with fine, even air-cells.
The process of kneading seems to impart an evenness to the minute air-cells, a fineness of texture, and a tenderness and pliability to the whole substance, that can be gained in no other way.
Our lives are not thoroughly shaped out and individualized till we have lived and suffered in every part of us. A great feeling reveals new powers in the soul, as a deep breath fills air-cells in the lungs that are not reached by an ordinary inhalation.
Signs in this region might refer to either of these, for the reason that, although a sufficient intake of air is one of the necessary conditions of proper oxygenation, a free and abundant circulation of the blood through the air-cells is equally essential.
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