London, Routledge & Kegan Paul 1950 viii + 322pp., 2nd impression, in the series "The International Library of Psychology, Philosophy and Scientific Method", 22cm., publisher's hardcover in blue cloth, dustwrapper (with some small tears and some loss of paper at ends of spine, spine bit spotted), few foxing on edges, text and interior clean and bright, previous owner's name on blanco endpaper, good condition, F105249