English summary: Tome IV (vol. 5) of the Hermogenian Corpus Rhetoricum is dedicated to the second book of this corpus, a treatise on style, derived from a treatise on the Progymnasmata, which deals with invention. The text, which deals with the stylistic categories of the discourse, is supplemented here by prolegomena and synopses. The doctrine of style that the Hermogenian expose identifies with is of 2nd century AD tradition. The core of...