Some schools took their name from cities, as the Elians and the Megarians, the Eretrians and the Cyrenaics ; others from localities, as the Academics and the Stoics ; others from incidental circumstances, as the Peripatetics ; others again from derisive nicknames, as the Cynics; others from their temperaments, as the Kudaemonists or Happiness School ; others from a conceit they entertained, as Truthlovers, Refutationists, and Reasoners from Analogy ; others again from their teachers, as Socratics, Epicureans, and the like; some take the name of Physicists from their investigation of nature, others that of Moralists because they discuss morals ; while those who are occupied with verbal jugglery are styled Dialecticians. Philosophy has three parts, physics, ethics, and dialectic or logic. Physics is the part concerned with the universe and all that it contains; ethics that concerned with life and all that has to do with us; while the processes of reasoning employed by both form the province of dialectic. Physics flourished down to the time of Archelaus ; ethics, as we have said, started with Socrates; while dialectic goes as far back as Zeno of Elea. In ethics there have been ten schools: the Academic, the Cyrenaic, the Elian, the Megarian, the Cynic, the Eretrian, the Dialectic, the Peripatetic, the Stoic, and the Epicurean. The founders of these schools were: of the Old Academy, Plato; of the Middle Academy, Arcesilaus; of the New Academy, Lacydes; of the Cyrenaic, Aristippus of Cyrene ; of the Elian, Phaedo of Elis ; of the Megarian, Euclides of Megara; of the Cynic,