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All over the plains people were hemmed in tar-paper shacks, the world diminished for them to the dimensions of their thin-walled houses, as alone as though each were the only dweller on the prairie. The team, Fan and Bill, and Lakota were the only horses tied up in the hay barn. They could reach the hay and eat snow for water. There would be plenty of snow.
It does not carry oxygen or collect the carbon dioxid as does the blood of higher animals. That work, as we have just seen, is done by the air-tubes. Above the alimentary canal, extending almost the whole length of the abdomen and thorax, is a thin-walled pulsating vessel, the heart.
It was necessary to maintain a watch till morning because the country districts of Korea are infested with wild animals, particularly tigers, and the bright blaze of the fire served to keep them at a distance. Otherwise the thin-walled houses would have been slight protection for the sleeping travellers.
To illustrate it, take a piece of rather thin-walled tubing, about 3/4 inch in diameter, and some pieces of rather strong tubing a little less than 1/4 inch in diameter.
And he sat quite still, his hand clutching the bedclothes, his head askew, waiting for the sound of footsteps, for the presences and the voices that have their thin-walled dwelling beneath the shallow crust of consciousness. Inky blackness drifted up in wisps, in smoke before his eyes; he was powerless to move, to cry out. There was no room to turn; no air to breathe.
The substance is now weighed out in a piece of thin-walled glass tubing, closed at one end, and about two inches long. Inclining the large tube at a suitable angle, the small one is introduced, closed end first, and allowed to slide down the walls of the large tube until it reaches the place where the acid has wet the tube.
But the more or less decomposed and dissolved animal matter is doubtless absorbed into the plant; for the whole interior of the sac is lined with peculiar, elongated and four-armed very thin-walled processes, which contain active protoplasm, and which were proved by experiment to "have the power of absorbing matter from weak solutions of certain salts of ammonia and urea, and from a putrid infusion of raw meat."
We have in the liver, on a grand scale, exactly the same conditions as obtain in the smaller and simpler glands. The thin-walled liver cells take from the blood certain materials which they elaborate into an important digestive fluid, called the bile. This newly manufactured fluid is carried away in little canals, called bile ducts.
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