Introduction: historical and critical, by Julian Huxley.--Prolegomena, written by T.H. Huxley as an introd. to Evolution and ethics.--Evolution and ethics, Romanes lecture delivered by T.H. Huxley in 1893.--Evolutionary ethics, Romanes lecture delivered by Julian Huxley in 1943.--The vindication of Darwinism, by Julian Huxley, 1945.--Conclusion, by Julian Huxley.