 Herman shares technical terminology with Hugh and a penchant for evocation of the "Asclepius", most notably in "De essentiis" (see below)

His original contribution to philosophy was "De essentiis" ("On essences").In this work Herman deals with five Aristotelian categories (causa, motus, spatium, tempus, habitudo).He started to write this treatise in 1143 in Toulouse and he completed it the same year in Béziers.