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Updated: May 6, 2025
Again, two distinct organs, or the same organ under two very different forms, may simultaneously perform in the same individual the same function, and this is an extremely important means of transition: to give one instance there are fish with gills or branchiae that breathe the air dissolved in the water, at the same time that they breathe free air in their swim-bladders, this latter organ being divided by highly vascular partitions and having a ductus pneumaticus for the supply of air.
Seeing how important an organ of locomotion the tail is in most aquatic animals, its general presence and use for many purposes in so many land animals, which in their lungs or modified swim-bladders betray their aquatic origin, may perhaps be thus accounted for.
Seeing how important an organ of locomotion the tail is in most aquatic animals, its general presence and use for many purposes in so many land animals, which in their lungs or modified swim-bladders betray their aquatic origin, may perhaps be thus accounted for.
"He began anywhere," continues this irresistibly comic sketch; "you put some question to him, made some suggestive observation; instead of answering this, or decidedly setting out towards an answer of it, he would accumulate formidable apparatus, logical swim-bladders, transcendental life-preservers, and other precautionary and vehiculatory gear for setting out; perhaps did at last get under way but was swiftly solicited, turned aside by the flame of some radiant new game on this hand or on that into new courses, and ever into new; and before long into all the universe, where it was uncertain what game you would catch, or whether any."
In fact, the lungs themselves in all the higher animals are merely the swim-bladders of fish, slightly altered so as to perform a new but closely allied office. The mud-fish is common enough in all the larger English aquariums, owing to a convenient habit in which it indulges, and which permits it to be readily conveyed to all parts of the globe on the same principle as the vans for furniture.
He began anywhere: you put some question to him, made some suggestive observation: instead of answering this, or decidedly setting out towards answer of it, he would accumulate formidable apparatus, logical swim-bladders, transcendental life-preservers and other precautionary and vehiculatory gear, for setting out; perhaps did at last get under way, but was swiftly solicited, turned aside by the glance of some radiant new game on this hand or that, into new courses; and ever into new; and before long into all the Universe, where it was uncertain what game you would catch, or whether any.
In Nova Scotia, where many codfishes are caught, the swim-bladders are called sounds, and are cooked as a delicacy. In the spring of the year we eat the roe of fish, which is nothing more nor less than fish eggs. Wherever shad are used, the children will be familiar with the shad roe; and in the South mullet roes are universally used.
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