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Updated: May 9, 2025
We can thus also understand the apparent paradox, that the very same characters are analogical when one group is compared with another, but give true affinities when the members of the same group are compared together: thus the shape of the body and fin-like limbs are only analogical when whales are compared with fishes, being adaptations in both classes for swimming through the water; but between the the several members of the whale family, the shape of the body and the fin-like limbs offer characters exhibiting true affinity; for as these parts are so nearly similar throughout the whole family, we cannot doubt that they have been inherited from a common ancestor.
Evans," returned Marion, rising, "you will sit down and hear the case out." With a waving, fin-like motion of both his hands, Evans sank into his seat, and spoke no word. After but a moment's silence, she resumed as if there had been no interruption.
If this were the case the absence of metamorphosis in the legs is itself an adaptation, the disuse of the paired limbs in the larva having caused the earlier fin-like stages of these limbs to disappear, while the terrestrial leg was developed later by heredity, just as the legs have disappeared in the larvae of many insects, though fully developed in the adult.
For, after thrashing the deck with a series of tremendous blows with his tail, the shark had his quietus given to him with a few blows of a hatchet, and as he lay upon the deck my uncle pointed out to me the peculiarity of the monster's structure, and after we had examined his nasty sharp triangular teeth in the apparently awkwardly placed mouth, I was shown how it was that a shark had such wonderful power of propelling itself through the water, for in place of having an ordinary fin-like tail, made up of so many bones with a membrane between, the shark's spine is continued right along to the extremity of the upper curve of its propeller, the other curve being comparatively small.
But as Providence bestows upon fishes the instrument of fins, whereby they balance and direct their movements, however rapid and erratic, through the pathless deeps, so to the cold-blooded creatures of our own species that may be classed under the genus Money-Makers the same protective power accords the fin-like properties of prudence and caution, wherewith your true money-getter buoys and guides himself majestically through the great seas of speculation.
So again, it is probable, from what we know of the embryos of mammals, birds, fishes and reptiles, that these animals are the modified descendants of some ancient progenitor, which was furnished in its adult state with branchiae, a swim-bladder, four fin-like limbs, and a long tail, all fitted for an aquatic life.
In addition, there are four fin-like arms that fold into the body when at rest, but are spread for service when traveling. In all it must be admitted that these Stazza people are capable of traveling more rapidly, and covering longer distances with much less fatigue than are we. They can also carry greater burdens with more ease.
Yet neither the amphibian larva nor the embryo of higher Vertebrates develops anything closely similar to a fin. There is no gradual change of a fin-like limb into a leg, but the leg develops directly from a simple bud of tissue.
But the condition of the Dipnoi, which possess lungs but do not walk on land, does not support this supposition, for they possess fins which are either filamentous or fin-like, having a central axis with rays on each side.
If men stayed long enough in trenches, I should say, from my studies in evolution, that their legs would slowly merge into one sort of fin-like tail, and their arms into seal-like flappers. In fact, time would convert them into intelligent sea-lions, and render them completely in harmony with their natural life. Our tonic began by being taken, one dose after meals, twice daily.
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