1929. Lewis presents his conceptions which grew out of his investigations in the field of exact logic and its application to mathematics. Contents: About Philosophy in General and Metaphysics in Particular. The Proper Method of Philosophy; The Given Element in Experience; The Pure Concept; Common Concepts and Our Common World; The Knowledge of Objects; The Relativity of Knowledge and the Independence of the Real; The A Priori-Traditional Conceptions; The Nature of the A Priori, and the Pragmatic Element in Knowledge; The A Priori and the Empirical; The Empirical and Probable; and Experience and Order.

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