London: Macmillan and Co., Limited, 1940. First edition. Hardcover. 8vo. [6], vii-x, 276 pp. Blue cloth with gold lettering on the spine. Price of 10s. 6d. net on the front flap of the jacket. Slater 28. A.J. Ayer's third book, an exploration of the philosophy of metaphysics and epistemology. He..... More