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Updated: June 25, 2025
They had some diseases in common; they were both subject to the same parasitical worms in the intestines; and, strange to say, the An has, in his structure, a swimming-bladder, no longer of any use to him, but which is a rudiment that clearly proves his descent from a Frog.
The nature of the things that will ultimately fight in the sky is a matter for curious speculation. We begin with the captive balloon. Against that the navigable balloon will presently operate. I am inclined to think the practicable navigable balloon will be first attained by the use of a device already employed by Nature in the swimming-bladder of fishes.
The same vessels which penetrate between the plates or leaves of these organs, and which cover them with blood when they are cut transversely, also send out numerous branches to the exterior surface of the air-bladder. I found in a hundred parts of the air of the swimming-bladder four of oxygen and ninety-six of nitrogen.
Again, the Frog had the power to live alike on land and in water a mighty privilege, partaking of a spiritual essence denied to the An, since the disuse of his swimming-bladder clearly proves his degeneration from a higher development of species.
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