Scotism refers variously to (1) a loosely identified body of views thought to be original with or characteristic of John Duns Scotus, (2) a tradition of texts, doctrines, and approaches that traces back to him, and (3) a via ("way" or perhaps "school") that had an institutional presence in the universities of the fifteenth through the seventeenth centuries. In the first sense scholars today speak of "logical Scotism" in the work of authors who perhaps have never heard of Scotus. In both the first and the second senses scholars ask whether Charles Sanders Peirce, who had read Scotus with care but was a fiercely independent thinker, was a Scotist. In the third sense scholars inquire about the presence of Scotism in the arts and theology faculties of particular universities in the sixteenth century and investigate its fortuna. Confusion can arise (and has arisen) from running these together and one should take...