"Among natural philosophers may be enumerated Thales, Pythagoras, Empedocles, Heraclitus, Anaximander, Anaximenes, Anaxagoras, Archelaus, Parmcnides, Leucippus, Democritus, Xenophanes, Ecphantus, Hippo. Among moral philosophers are Socrates, pupil of Archelaus the physicist, [and] Plato the pupil of Socrates. This [speculator] combined three systems of philosophy. Among logicians is Aristotle, pupil of Plato. He systematized the art of dialectics. Among the Stoic [logicians] were Chrysippus [and] Zeno. Epicurus, however, advanced an opinion almost contrary to all philosophers. Pyrrho was an Academic; this [speculator] taught the incomprehen sibility of everything. The Brahmins among the Indians, and the Druids among the Celts, and Hesiod [devoted them selves to philosophic pursuits]."