title: Galen's six non-naturals: a bibliographic note and translation.
mesh_terms: D000388:Air; D001634:Bibliographies as Topic; D003075:Coitus; D004326:Drinking; D005060:Europe; D005502:Food; D049668:History, 15th Century; D005082:Physical Exertion; D012146:Rest; D012890:Sleep; D014851:Wakefulness