and at the same time have a mind full of the names of the ancient philosophers and their principles, ''of the ideas of Plato,b the atoms of Epicurus, of the plenum and vacuum of Leucippus and of Democritus, Thales' water, Anaximander on the infinity of nature, Diogenes' air, the numbers and symmetry of Pythagoras, Parmenides' infinity, the one of Museus, the fire and water of Apollodorus, the like particles of Anaxagoras, the discord and love of Empedocles, Heraclitus' fire, etc.?''