Excerpts from Michael Psellos, De omnifaria doctrina (De omnifaria doctrina, ed. L. G. Westerink, Utrecht 1948, chs 122-125, 127, 142-145, 147-150, 165) and from Simeon Seth, Quaestiones Naturales ( PG 122.785 chs 1-3, 5-7, 16, 26-29). Preceded by Περὶ αἰῶνος (ed. Westerink pp.102-104).