ABSTRACT
The work that came to be known as the Port Royal Logic was probably the most influential logic book of its time. It was first published, anonymously, in 1662 as La Logique ou I 'art de penser, I and was pretty much continuously in print both in France and in England well into the second half of the nineteenth century. It appeared in England in 1664, being published first in French, then in Latin, and then in English translation in 1685. New translations, based on later editions, appeared in 1717 and 1818. The work was influential not only insofar as it was a standard textbook, but also in that it became a model for other such works. A glance at the tables of contents of logic books from the eighteenth century will confmn this. John Locke was also very much influenced by the Port Royal Logic, adopting some of its organization and terminology in his own work, despite the fact that it opens with an attack on what was to become one of Locke's most cherished dogmas, that all our ideas come entirely from sense experience.
