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The two related questions I wish to pose are as follows: To what extent can the Port Royal Logic be considered a Cartesian logic, and to what extent does it differ from previous logics? My response will consist in a series of comparisons between what Descartes called his logic, what the self-avowed first generation of followers of Descartes considered to be Cartesian logic, and developments in seventeenth-century scholastic logic. I conclude that the logic produced by the Cartesians merely reinforced certain developments in seventeenth-century scholastic logic. The Port Royal Logic, which, for the Cartesians of the end of the seventeenth century, was the Cartesian logic par excellence, also has many traits in common with neo-scholastic logic.