Anaxagoras, successor of Anaximenes, was born B.C. 500 years. After giving great distinction to the Ionic school, he came to reside at Athens, where he taught Pericles and Euripides, at the same time he was opening the source from which Socrates derived his knowledge of natural philosophy. Parmenides, Zeus, and Leucippus, natives of Elea, enhanced the reputation of the Eleatic school, founded by Zenophanes, about B.C. 500 years. Democritus, a disciple of Leucippus, increased its fame still more, but modified its doctrines extensively. Socrates, according to Cicero, "brought down philosophy from heaven to dwell upon earth, who made her even an inmate of our habitations." His discomfiture of the Sophists, whose futile logic inflicted much injury on the Athenian mind, was a great blessing to his country, but one which cost the benefactor his life. His doctrines were never committed to writing by himself, but have been preserved in substance by his distinguished pupils Plato and Xenophon. The Cyrenaic sect was founded by Aristippus, a disciple of Socrates. It degenerated through the varied succession of Theodorus, Hegesias, and Anniceris, to merge finally in the kindred doctrines on happiness inculcated by Epicurus. Antisthenes was the first of the Cynics, and was succeeded by the more notorious Diogenes. This school was composed of disciplinarians, rather than doctrinists, whose whole business was the endeavor to arrange the circumstances of life, that they may produce the maximum of pleasure and the minimum of pain. The caustic wit of Diogenes was directed against more refined teachers, especially his great cotemporary, Plato. The latter, in terms which implied respect for the evident talents of a rival whom he had so much reason to despise, called him "a Socrates run mad." Archelaus succeeded Diogenes, and was called, by way of eminence, "the natural philosopher." Before him, Anaxagoras had taught occasional disciples in Athens; but it is probable that Archelaus was the first to open a regular school there. He transferred the chair of philosophy from Ionia to the metropolis of Minerva 450 years before Christ. The Megaric sect of Sophists was the last and worst. It was founded by Euclides, and produced Eubulides, Alexinus, Eleensis, Diodorus, and Stilpo. Cotemporary criticism applied to some of these such epithets as the Wrangler, or the Driveler, which, doubtless, were well deserved. Stilpo was the last gleam of philosophic worth in Greece.