Logique de Port-Royal , originally published in 1662, is a significant work on logic and epistemology, deeply rooted in the philosophy of René Descartes. Authored primarily by Antoine Arnauld, with contributions from Pierre Nicole, this influential text presents a systematic treatment of logic, covering topics such as judgment, proposition, reasoning, and method. This edition includes a notice on the philosophical works of Antoine Arnauld and is accompanied by detailed notes. The Logique de Port-Royal emphasizes clarity, precision, and the application of reason in understanding the world. It aims to provide readers with a comprehensive guide to thinking rigorously and avoiding common errors in reasoning. Its enduring appeal lies in its clear exposition of logical principles and its relevance to various fields of knowledge. It remains a valuable resource for students and scholars interested in the history of logic, philosophy, and linguistics. This work has been selected by scholars as being culturally important, and is part of the knowledge base of civilization as we know it. This work was reproduced from the original artifact, and remains as true to the original work as possible. Therefore, you will see the original copyright references, library stamps (as most of these works have been housed in our most important libraries around the world), and other notations in the work. This work is in the public domain in the United States of America, and possibly other nations. Within the United States, you may freely copy and distribute this work, as no entity (individual or corporate) has a copyright on the body of the work. As a reproduction of a historical artifact, this work may contain missing or blurred pages, poor pictures, errant marks, etc. Scholars believe, and we concur, that this work is important enough to be preserved, reproduced, and made generally available to the public. We appreciate your support of the preservation process, and thank you for being an important part of keeping this knowledge alive and relevant.