Publisher's Synopsis
Excerpt from The Useful Arts, Considered in Connexion With the Applications of Science, Vol. 2 of 2: With Numerous Engravings
The swimming bladder, which exists in most fishes, though not in all, is supposed to have an agency in adapting the specific gravity of the fish to the particular depth, in which it resides. The power of the animal to rise or sink, by altering the dimensions of this organ, has been, with some reason, disputed.
T Lectures on Comparative Anatomy, vol. I. P. 116, Sir E Home deduces this fact from the anatomy of the animal, and from the movements which he perceived, in suffering a large coluber to crawl over his hand. The ribs appeared to be raised, spread, carried for ward, depressed, and pushed backward, successively.
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