First ed. published in 1974 as vol. 2 of The Philosophy of Karl Popper, Open Court, La Salle, Ill. Includes bibliographical references (p. [240]-250) and index. Omniscience and fallibility -- Childhood memories -- Early influences -- The First World War -- Infinity -- The problem of essentialism -- A long digression concerning essentialism -- Marxism; science and pseudoscience -- Early studies -- Dogmatic and critical thinking -- Music -- Speculations about the rise of polyphonic music -- Two kinds of music -- Progressivism in art, especially in music -- Last years at the university -- Theory of knowledge -- Who killed logical positivism? -- Realism and quantum theory -- Objectivity and physics -- Truth; probability; corroboration -- The approaching war; the Jewish problem -- Emigration: England and New Zealand -- Early work in New Zealand -- The open society and The poverty of historicism -- Other work in New Zealand -- England -- Early work in England -- First visit to the United States. Meeting Einstein -- Problems and theories -- Debates with SchrèodInger -- Objectivity and criticism -- Induction; deduction; objective truth -- Metaphysical research programmes -- Fighting subjectivism in physics -- Boltzmann and the arrow of time -- The subjectivist theory of entropy -- Darwinism as a metaphysical research programme -- World 3 or the third world -- The body-mind problem and world 3 -- The place of values in a world of facts.