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When scientifically-minded men, therefore, now take a long look ahead, the Utopian visions of the mid-Victorian age are not foremost in their thought. Rather, as one of them recently wrote: "One is tempted to imagine this race of supermen, of some millions of years hence, grimly confronting the issue of extinction.
What must it be for the scientifically-minded man to see taking place before his eyes so many of the processes of the secret chemistry of nature, or for the philosopher to have revealed to him so much more than ever before of the working of the great mysteries of life and death?
Imagine a scientifically-minded threadworm to inhabit a page of Euclid's solid geometry: the evidences of three-dimensionality are there, in the very diagrams underneath his eyes; but you could not show him a solid the flat page could not contain it, any more than our space can contain a form of four dimensions. You could only say to him, "These lines represent a solid."
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