Front Cover; Statistical Mechanics; Copyright Page; Contents; Preface to the Second Edition; Preface to the First Edition; Historical Introduction; Chapter 1. The Statistical Basis of Thermodynamics; Chapter 2. Elements of Ensemble Theory; Chapter 3. The Canonical Ensemble; Chapter 4. The Grand Canonical Ensemble; Chapter 5. Formulation of Quantum Statistics; Chapter 6. The Theory of Simple Gases; Chapter 7. Ideal Bose Systems; Chapter 8. Ideal Fermi Systems; Chapter 9. Statistical Mechanics of Interacting Systems: The Method of Cluster Expansions.