Primal myth and modern delusion joined in their assumption that mankind is only one—perhaps the least—of the highly evolved and dominant races of this planet’s long and largely unknown career. Things of inconceivable shape, they implied, had reared towers to the sky and delved into every secret of Nature before the first amphibian forbear of man had crawled out of the hot sea three hundred million years ago. Some had come down from the stars; a few were as old as the cosmos itself; others had arisen swiftly from terrene germs as far behind the first germs of our life-cycle as those germs are
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