Abstract
This article offers a thorough analysis of the issue of conjecture (στοχασμός) as described in Hermogenes of Tarsus’ <i>On Issues</i>. The rhetorician’s theory is completed with the explanations from its most important exegeses: Syrianus, Sopater <i>(Rhetores Graeci</i> 5 Walz), Sopater-Syrianus-Marcellinus <i>(Rhetores Graeci</i> 4 Walz), fundamentally, and the Anonymous Commentary <i>(Rhetores Graeci</i> 7 Walz). Scholia are essential because they help us to understand the Hermogenic text, pointing out its strengths and weaknesses. They also contribute to tracing the whole of the rhetorical tradition previous to, contemporary with, and after Hermogenes.