New York: Basic Books, Publishers [1962], 1962. First edition. Hardcover. Near Fine/Near Fine. 8vo. [6], vii-xi, [3], 3-412 pp. Orange cloth with gold lettering blocked in brown on the spine. Price of $10.00 on the front flap of the dust jacket. Jacket design by Loretta Li. Popper's treatise on a theory of knowledge: here he discusses how a human being can advance their understanding of the world by conducting tests to examine proposed hypotheses, or conjectures. A sharp copy. Light edge wear to the spine panel and to one corner of the dust jacket.