A. The Evolution of the Particle Concept before the Advent of Quantum Mechanics B. Non-Relativistic Quantum Mechanics and Atomic Physics C. Relativistic Quantum Theory D. Nuclear Phenomena E. Subnuclear Phenomena 1. Introduction 2. The Baryon Spectrum 3. Mesons 4. Conservation of Isospin, Strangeness, Charm, and Baryon Number 5. Quarks 6. Hadronic Spectroscopy 7. The Strong Interaction Field: Quantum Chromodynamics 8. The Electromagnetic Interaction of Hadrons 9. Charge-changing Weak Interactions 10. The Relationship between Weak and Electromagnetic Interactions 11. Neutral Kaons and CP Violation 12. Synopsis: The Standard Model 13. Outlook