Two Unnoticed Editions of Girolamo Saccheri's Logica Demonstrativa

Since its rediscovery in 1903, the Logica Demonstrativa by Girolamo Saccheri is known in three editions -1697, 1701, and 1735, the 1735, edition being posthumous. The 1697 edition is without the name of the author. This article calls attention to two unnoticed editions (1696? and 1699), the first one unsigned and the second by 'Carolus Iosephus Saccarellus', a Saccheri pseudonym. The publishing history of the work has been partially clarified, though a number of problems remain unsolved. Apres sa redecouverte in 1903, on connait trois editions de la Logica demonstrativa par Girolamo Saccheri (1697, 1701, 1735: cette derniere edition apres sa mort). L'edition du 1697 est anonyme. L'article veut faire connaitre deux editions inconnues (1696? et 1699), dont la premiere est ancore anonyme et la deuxieme a comme auteur 'Carolus Saccarellus', un pseudonyme de Saccheri. Ca eclaircit, en part, les questions liees a l'histoire des editions de l'oeuvre. Hieronymi Saccherii Logica demonstrativa ex oblivione tracta est a Johannes Vailati, Italiae philosopho, Anno Domini 1903. Ter Logica edita fuit, in commune doctorum virorum opinione, annis Domini 1697, 1701, 1735. Quorum editionum, prima sine nomine auctoris est, postrema eius mortem secuta. Duas autem ignotas Logicae editiones inveni, alteram pariter sine auctoris nomine, alteram quodam Iosepho Saccarello ascriptam, certe ipsius Saccherii alienum nomen. Quae omnia nonnullas quaestiones de Logica demonstrativa illustrant.