Section 1 of this entry gives some historical context for a vast array of logical works, and section 2 provides a number of texts as samples of the philosophical arguments they contain. The philosophical assessment of the arguments is a task that is now underway in the secondary literature, and I refer to some of these assessments in the notes. My primary interest, however, is in presenting a set of texts which illustrate the trajectory of arguments carried on through a formative period of the discipline.