 In modern times, The Port Royal Logic (Arnauld and Nicole 1662, originally titled Logic or the Art of Thinking) is an attempt to outline a logic that can guide everyday reasoning. It is a celebrated (and often disdained) introduction to the art of arguing which has been published in more than fifty French editions and five popular English translations. It understands “logic” as “the art of directing reason aright, in obtaining the knowledge of things, for the instruction both of ourselves and others” (25). In keeping with this, it provides a practical account of good and poor argument, discussing fallacies, syllogisms, definitions, and deductive and probable reasoning, emphasizing real rather than concocted examples of argument (see Finocchiaro 1997). 