This special supplementary volume of Oxford Studies in Ancient Philosophy contains the proceedings of the Colloquium on Ancient Philosophy held at Oberlin, Ohio in 1986. The exceptionally high quality of the papers, and the format of speaker, reply, and speaker's reply, has resulted in a volume which furthers some issues which are currently the object of keen controversy in ancient philosophy. Contributors include Michael Frede, Terence Irwin, and Martha Nussbaum.