I. Radical Empiricism and the Anomalies in the Knowledge of Science -- II. Troubles with the Problem of Demarcation -- III. The Context of Discovery and the Context of Justification -- IV. Facts and Theories: Radical Empiricism -- V. Facts and Theories: Conventionalism -- VI. Reformation and Counter-reformation: Paradigms and Research Programs -- VII. Revolutions in Science: The Accumulation of Knowledge and the Correspondence of Theories -- VIII. Revolutions in Science: Science and Philosophy -- Index of Names -- Index of Subjects