La logique, ou l'art de penser , contenant outre les règles communes, plusieurs observations nouvelles, propres à former le jugement

Eighth edition statement.
Later full blonde sheep binding with tree calf pattern (ca 1790). Smooth spine decorated with scattered ornaments, Greek key patterns, eye in a sun motif, various roulettes. Pink morocco title label. Headcap and tailcap repaired, with slight lacks. Spine slightly faded. 3 corners slightly bumped.
A famous and important work in the history of thought, often called "The Logic of Port-Royal", this represents the logical approach according to Jansenism, a Cartesian and Pascalian approach to reason, associating reason with mathematical reasoning viewed as an ideal of thought. The author was a great intellectual figure of the 17th century, not only as a controversialist, but also as a philosopher and scholar; he collaborated with Pierre Nicole, another renowned Jansenist, in writing this work.