This book comprises a series of studies devoted to an analytic examination of reasoning in the field of conduct. The first is analysis of the idea of justice undertaken in a spirit of positivism; the series continues in a different vein necessitated by compelling obligation the author found himself under to work out a logic of value judgments. This logic is in fact the Rhetoric and Topics of antiquity: the author's "Traité de l' Argumentation (Paris, 1958) gave this new life, and the present work demonstrates its philosophical importance.

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