Hermogenes’ On Forms of Style became one of the most influential works of ancient rhetorical and literary theory, thanks especially to its canonical status in the Byzantine rhetorical curriculum. This article reveals a basic compositional strategy of the work. Hermogenes not only describes how each form of style is produced by a combination of stylistic features, but his discussions also constitute implicit demonstrations of the forms themselves. This phenomenon is separate from explicit examples quoted from Classical authors; it is observed in his discussion of each form; and it helps explain otherwise puzzling moments in the treatise.