A. J. Ayer. Editor's introduction. Logical positivism, edited by A. J. Ayer, The Free Press, Glencoe, Illinois, 1959, pp. 3–28; also first paperback edition, The Free Press, New York 1966, pp. 3–28. - Bertrand Russell. Logical atomism. A reprint of XXV 333. Logical positivism, edited by A. J. Ayer, The Free Press, Glencoe, Illinois, 1959, pp. 31–50; also ibid., pp. 31–50. - Moritz Schlick. Positivism and realism. A reprint of XVI 67. Logical positivism, edited by A. J. Ayer, The Free Press, Glencoe, Illinois, 1959, pp. 82–107; also ibid., pp. 82–107. - Carl G. Hempel. The empiricist criterion of meaning. A reprint of XVI 293. Logical positivism, edited by A. J. Ayer, The Free Press, Glencoe, Illinois, 1959, pp. 108–129; also ibid., pp. 108–129. - Rudolf Carnap. The old and the new logic. English translation of 3525 by Isaac Levi. Logical positivism, edited by A. J. Ayer, The Free Press, Glencoe, Illinois, 1959, pp. 133–146; also ibid., pp. 133–146. - Hans Hahn. Logic, mathematics and knowledge of nature. English translation of 4193 by Arthur Pap. Logical positivism, edited by A. J. Ayer, The Free Press, Glencoe, Illinois, 1959, pp. 147–161 ; also ibid., pp. 147–161. - Friedrich Waismann. How I see philosophy. A reprint of XXIII 209. Logical positivism, edited by A. J. Ayer, The Free Press, Glencoe, Illinois, 1959, pp. 345–380; also ibid., pp. 345–380.