Introduction: Logical empiricism -- Language, meaning, and truth : Is existence a predicate? -- Designation and existence -- The semantic conception of truth -- On sense and nominatum -- On denoting -- Meaningfulness and confirmation : Truth and confirmation -- Experience and meaning -- Meaning and verification -- Messrs. schlick and ayer on immortality -- Pictorial meaning and picture thinking -- The scientific world-perspective -- The nature of logic and mathematics : Logic without ontology -- The relevance of psychology to logic -- On the nature of mathematical truth -- Geometry and empirical science -- Truth by convention -- Is there synthetic a priori knowledge? : Is there a factual a priori? -- The pragmatic conception of a priori -- Induction and probability : The logical character of the principle of induction -- The logical foundations of the concept of probability -- On the justification of induction -- The two concepts of probability -- Data, reality, and the mind-body problem: Hume's philosophy -- The refutation of realism -- The logical analysis of psychology -- Some logical considerations concerning the mental -- On the relation between psychological and physical concepts -- Logical foundations of the unity of science -- Realism and the new way of words -- Problems of description and explanation in the empirical sciences : The function of general laws in history -- The "nature" of a continuant -- The contrary-to-fact conditional -- Operationalism and scientific method -- Some remarks on the meaning of scientific explanation -- Causality in everyday life and in recent science -- Mechanical and Teleological causation -- Explanation, mechanism, and teleology -- Problems of theoretical ethics : Some of the main problems of ethics -- Review of Julian S. Huxley's Evolutionary ethics -- The nature of ethical disagreement -- The freedom of the will

1. Philosophy