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The Logic of Modern Physics. By P. W. Bridgman . (New York: The Macmillan Company. 1927. Pp. xiv + 228. Price 10s. 6d.)

Space and Time. By Émile Borel . (London and Glasgow: Blackie & Son, Ltd. 1926. Pp. xiv + 234. Price 7s. 6d.)

L. S. Stebbing