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106 "The theory of Relativity," says a critic whose eyelids, like the Lady Lisa's, are a little weary, "promises to develop into a principle as adequate to universal application as was the theory of Evolution. This latter theory, from being a technical biological hypothesis, became an inspiring guide to workers in practically every branch of knowledge: manners and customs, morals, religions, philosophies, arts, steam engines, electric tramways—everything had 'evolved.' 'Evolution' became a very general term; it also became imprecise until, in many cases, the original, definite meaning of the word was lost, and the theory it had been evoked to describe was misunderstood. We are hardy enough to prophesy a similar career and fate for the theory of Relativity. The technical physical theory, at present imperfectly understood, will become still more vague and dim. History repeats itself, and Relativity, like Evolution, after receiving a number of intelligible but somewhat inaccurate popular expositions in its scientific aspect, will be launched on a world-conquering career. We suggest that, by that time, it will probably be called Relativismus, Many of these larger applications will doubtless be justified; some will be absurd and a considerable number will, we imagine, reduce to truisms. And the physical theory, the mere seed of this mighty growth, will become once more the purely technical concern of scientific men."

But for such a world-conquering career an idea