Keckermann remarked of the sixteenth century, "never from the begin- ning of the world was there a period so keen on logic, or in which more books on logic were produced and studies oflogic flourished more abun- dantly than the period-in which we live. " 1 But despite the great profusion of books to which he refers, and despite the dominant position occupied by logic in the educational system of the fifteenth, sixteenth and seven- teenth centuries, very little work has been done on the logic of the post- medieval period. The only complete study is that of Risse, whose account, while...