12mo, pp. 473, [7, table of contents, errata, privilege]; light toning, light damp staining to upper outer corners at beginning, small burn hole to pp. 429-434 repaired and lost words supplied in manuscript; otherwise a very good copy in contemporary calf, spine gilt in compartments, sprinkled edges; joints and extremities a little worn; inscription ‘Emile Calais 1852’ to rear endpaper.
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La logique ou l’art de penser, contenant, outre les regles communes, plusieurs observations nouvelles propres à former le iugement.
Scarce first edition of the work known as the Port Royal Logic. The authors were leaders of the Port Royal movement, and the book displays the distinctive tone of earnest piety for which the movement became famous. La Logique was the most famous logic text of the seventeenth century and set the form of manuals of logic for the next two hundred years. In particular, its division of the subject into the theory of conception, of judgment, of reasoning and of method established a psychologistic approach which dominated the field until the time of Frege. A handbook on method rather than a study of formal logic in the strict sense, La Logique was strongly and consciously Cartesian: a development from Descartes’ Regulae rather than Aristotle’s Prior Analytics. It nevertheless made important technical advances, most notably its distinction between the comprehension and extension of a term (a development of the medieval distinction between significatio and suppositio and a forerunner of Hamilton’s distinction between intension and extension); its quasi-mathematical treatment of the rules of distribution, conversion and syllogistic; and its formulation of the deduction theorem.
BM STC French 1601-1700, p. 333; Risse I, p.153.
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