Abstract
Papers and discussions on the title theme in either English or French from a meeting of the International Institute of Philosophy held at Oxford. There are papers by Ryle, Findlay, Calogero, Ayer, Ingarden, Zaragüeta, Perelman and Passmore, plus a "rapport de synthèse" by Devaux, and the meeting's opening and closing remarks by the President, Kotarbinski. The discussions following the papers are sometimes lively, though at other times they reflect not only philosophical dissension but a lack of communication.--N. S. C.