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Updated: April 30, 2025


If the formal impulsion becomes receptive, that is, if thought anticipates sensation, and the person substitutes itself in the place of the world, it loses as a subject and autonomous force what it gains as object, because immutability implies change, and that to manifest itself also absolute reality requires limits.

The present invariability of the world of organization is the direct consequence of the physical equilibrium, and so it will continue as long as the mean temperature, the annual supply of light, the composition of the air, the distribution of water, oceanic and atmospheric currents, and other such agencies remain unaltered; but if any one of these, or of a hundred other incidents that might be mentioned, should suffer modification, in an instant the fanciful doctrine of the immutability of species would be brought to its true value.

I was deceived; it was but a light cloud flitting over the moon; it rolled away, and the placid and guiltless light shone over that scene of dread and blood, making more wild and chilling the eternal contrast of earth and heaven man and his Maker passion and immutability dust and immortality.

Let us now see whether the several facts and laws relating to the geological succession of organic beings accord best with the common view of the immutability of species, or with that of their slow and gradual modification, through variation and natural selection. New species have appeared very slowly, one after another, both on the land and in the waters.

This could be effected by the future geologist only by his discovering in a fossil state numerous intermediate gradations; and such success is improbable in the highest degree. It has been asserted over and over again, by writers who believe in the immutability of species, that geology yields no linking forms. This assertion, as we shall see in the next chapter, is certainly erroneous.

He may also remember hearing for the first time some cant terms or slang phrases, which have since forced their way into common use, in spite of the efforts of the purist. But he may still contend that "within the range of his experience," his language has continued unchanged, and he may believe in its immutability in spite of minor variations.

"Of the immutability of one thing among all the changes I may witness on my return, at least I am certain no one still will dare to think for himself. The great want of each individual is, the want of an opinion! For instance, who judges of a picture from his own knowledge of painting?

As McDowell was the iron and steel embodiment of the law, so Shan Tung was the flesh and blood spirit of the mysticism and immutability of his race. His face was the face of an image made of an unemotional living tissue in place of wood or stone, dispassionate, tolerant, patient. What passed in the brain behind his yellow-tinged eyes only Shan Tung knew. It was his secret.

A few naturalists, endowed with much flexibility of mind, and who have already begun to doubt the immutability of species, may be influenced by this volume; but I look with confidence to the future, to young and rising naturalists, who will be able to view both sides of the question with impartiality.

All lines are clearly marked; there the revolutionary level found the masses too rugged and too hard to plane; its instrument would have been notched, if not broken. The character of immutability which science gives to zoological species is found in Breton human nature.

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