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Updated: June 26, 2025
In pneumonia or inflammation of the lung-substance the process is different. A portion of one or other lung, sometimes of both, becomes overfilled with blood, or congested, and though the air-tubes themselves are not the special seat of the congestion, yet the air-cells are pressed on by the surrounding swollen substance, and the entrance of air into them is impeded.
Sand and dirt and fragments of shattered rock whistled by in an apparently unending shower, only with reversed motion, flying upward in place of shooting downward to earth itself. Speech was utterly impossible under the circumstances, and the fate-tossed voyagers could only cling fast to the hand-rail, and hold those precious air-tubes in readiness for the worst.
Through these the air passes into a system of air-tubes, the tracheæ. There are two main trunks or divisions of the tracheæ just inside the body-wall and a number of shorter connecting trunks.
This lump had air-tubes running through it, which were not yet cut off by suppuration; and in one place, the cyst was perforated by a bronchial tube, letting in the external air to the lump, which was undergoing disorganization, and swelling badly. When cut into, it did not present the red, mottled, organized appearance of those cases with air-tight cysts.
"Sometimes the divers stay for hours on the bed of the sea, and work away at the amber tangles." "But suppose anything happens to the air-tubes and the men fail to get as much air as they need?" said Hans. "Is there any way of letting those in the boat know they are in trouble? And, besides that, how do the others know when it is time to raise the divers with their precious loads?"
The "thrasher" is a great cylindrical receptacle, revolving rapidly, which is supplied with long wooden beaters or arms passing through a wooden cylinder and driven by power. When the rags have been tossed in, there ensues a great pounding and thrashing, and the dust is carried off in suction air-tubes, while the whipped rags are discharged and carried to the "sorting" and "shredding" room.
This, however, is not entirely due to the greater exposure of the child to these influences as it grows older, but in part also to the fact that the lining of the air-tubes is less sensitive in early infancy than it afterwards becomes.
In bronchitis inflammation affects the lining of the air-tubes, travelling from the larger towards the smaller, and in bad cases extending even to their termination in the minute air-cells. The inflammation leads to the pouring out of a secretion, which by degrees becomes thick like matter, or even very tenacious, almost as tough as though it were a thin layer of skin.
I have dwelt at some length on this condition because it is important to know that during the first few weeks of life real inflammation of the lungs or air-tubes is of extremely rare occurrence, and that the symptoms which are not infrequently supposed to depend on it are really due to a portion of the lung more or less extensive never having been called into proper activity.
It is immaterial to the student of instinct whether the animal have eight legs instead of six, or pulmonary sacs instead of air-tubes. Besides, the Araneida belong to the group of segmented animals, organized in sections placed end to end, a structure to which the terms 'insect' and 'entomology' both refer.
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