INTRODUCTION I. THE PARALLELS 1. Irreducibilities 2.A prioriPrinciples 3. Approach to a Definition 4. The Basis of the Holism 5. Relationalism II. DEVIANT CAUSAL CHAINS 1. Some Inadequate Suggestions 2. Differential Explanation 3. Comparisons with Rival Theories 4. Refinements 5. Integration III. PHYSICALISM 1. Realization and Physicalist Theses 2. Kripke's Objections 3. An Argument for Token Identity 4. Constraints on Explanation 5. Further Defence 6. Indexicality and Points of View IV. INTERPRETATION 1. Applying a Scheme 2. Radical Interpretation 3. A Fuller Argument 4. Integrated Quasi-reductions INDEX