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Updated: June 9, 2025
But had kind Nature supplied us with an air-bladder at the neck, the heaviest of us might have floated to eternity, Leander's swimming across the Hellespont no wonder at all, and the drags of the Humane Society be converted into halters for the suspension and recovery of old offenders and small debts.
It is highly probable that the termites are endowed with some such faculty: nor is it more remarkable that an insect should combine the gases of its food to produce water, than that a fish should decompose water in order to provide itself with gas. FOURCROIX found the contents of the air-bladder in a carp to be pure nitrogen. Yarrell, vol. i. p. 42.
Great good luck came to us when the first pair of eyes were invented, probably by the trilobite back in Silurian times; when the first ear appeared, probably in Carboniferous times; when the first pair of lungs grew out of a fish's air-bladder, probably in Triassic times; when the first four-chambered heart was developed and double circulation established, probably with the first warm-blooded animal in Mesozoic times.
We then removed the caviare in solid masses, like cheeses, took it to the smoking-hut to dry, and in a few days had this large addition to our winter provision. My next employment was the preparation of the valuable isinglass. I took the air-bladder and sounds of the fish, cut them in strips, twisted them in rolls, and dried them in the sun.
Brodbelt, on the air contained in the natatory bladder of the sword-fish, had led some naturalists to think, that within the tropics, in sea-fish, that organ must be filled with pure oxygen gas. Full of this idea, I was surprised at finding in the air-bladder of the flying-fish only 0.04 of oxygen to 0.94 of azote and 0.02 of carbonic acid.
The same motion has been observed in the flying scorpion of the rivers of Japan: they also contain a large air-bladder, with which the great part of the scorpions that have not the faculty of flying are unprovided.
The Portuguese Man-of-War so called from its bright-colored crest, which makes it so conspicuous as it sails upon the water, and the long and various streamers that hang from its lower side is such a community of animals as I have just described, reversed in position, however, with the individuals hanging down, and the base swollen and expanded to make the air-bladder which forms its brilliant crested float.
Then the face disappeared with the swiftness of a blindworm popping into its burrow, and the next thing that I remember is my own voice in my own ears, saying gravely to the mainmast, 'But the air-bladder ought to have been forced out of its mouth, you know. Keller came up to me, ashy white.
A point of Natural History being suggested, he gave an excellent account of the air-bladder of fishes. He was very full upon the subject of agriculture, but retired from the conversation when horticulture was introduced in the discussion. So he seemed well acquainted with the geology of anthracite, but did not pretend to know anything of other kinds of coal.
Some species of fish known as the Dipnoi or "double-breathers," have a remarkable dual system of breathing. That is, they have gills for breathing while in the water, and also have a primitive or elementary "lung" in the shape of an air-bladder, or "sound," which they use for breathing on land.
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