The present volume offers the first critical edition of the medieval Arabic translation of Galen's Commentary on Book 6 of the Hippocratic Epidemics produced by Ḥunayn ibn Isḥāq (d. ca. 870). The edition is based on all extant Arabic textual witnesses, including the Arabic secondary transmission. Only about two thirds of the Greek original of this text is extant; the Arabic translation is therefore the only complete...