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When such tubing is worked, the walls of these microscopic tubes collapse in spots, and the air thus enclosed will often collect as a small bubble in the wall, thus weakening it. Irregularities are of various kinds. Some of the larger sizes of thin-walled tubing often have one half of their walls much thicker than the other, and such tubing should only be used for the simplest work.
It had to be removed with a scalpel, a very ticklish operation because of the proximity to the thin-walled great vein, which at the least incision sucks in air and produces instant death. But everything went well.
Now when this blood in its circulation flows through the active tissues for instance, the muscles it is again placed under conditions where osmosis is sure to occur. In the muscles the thin-walled blood-vessels are surrounded and bathed by a liquid called lymph. The lymph, which is not shown, fills all the space outside the blood-vessels, thus bathing both muscles and blood-vessels.
All the coats are thickened, chiefly by an increased development of connective tissue, and in some cases changes similar to those of arterio-sclerosis occur. The walls of varicose veins are often exceedingly brittle. In some cases the thickening is uniform, and in others it is irregular, so that here and there thin-walled sacs or pouches project from the side of the vein.
A group of mud-cells, each stored with food for the single larva within, we once found concealed in a deserted nest of the American Tent caterpillar. Eumenes fraterna, which attaches its single, large, thin-walled cell of mud to the stems of plants, is, according to Dr. T. W. Harris, known to store it with Canker worms.
"I'll count three," Douglas said, "and if you're not back by then I'll burn you down. You'll obey even if you won't do anything else. one two " George retreated to the far end of his cell. "Now face the wall." Douglas tossed the gas capsule into the cell. The thin-walled container broke, releasing a cloud of vapor. George crumpled to the floor.
Perhaps the most amiable feature of life in Gopher Prairie was the summer cottages. They were merely two-room shanties, with a seepage of broken-down chairs, peeling veneered tables, chromos pasted on wooden walls, and inefficient kerosene stoves. They were so thin-walled and so close together that you could and did hear a baby being spanked in the fifth cottage off.
When the body-wall contracts the air is forced out of the thin-walled trachea through the spiracles; when the pressure is removed they are refilled by the fresh air rushing in. After a mosquito has been feeding on a man or some other animal it is often so distended that the blood shows rich and red through the thin sides of the walls of the abdomen.
They used no strong drink at any time and as a consequence all but two of them were reported well and strong in the following spring. =The Lungs.= The lungs are two light spongy bodies filling up the greater part of the chest. The heart lies between the lungs. The lungs are formed largely of thousands of thin-walled sacs and two sets of tubes.
So close and fine is this network in the skin, for instance, that, as you can readily prove, it is impossible to thrust the point of the finest needle through the skin without piercing one of them and "drawing blood," as we say, or making it bleed. From this network of tiny, thin-walled tubes, the body-cells draw their food from the blood. The Meaning of Good Color.
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