The separate chapters of this book have already been published as essays in periodicals. The first, sec ond, third, and seventh appeared in The Hibbert Jour nal; the fourth, in The Philosophical Magazine and in the University of Cincinnati Studies; the fifth, in The M anisi; and the sixth, in The Unpopular Review. But they have been rewritten and enlarged so as to form chapters for a connected discussion of the Limita tions of Science. This was not a difficult task since I.
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