Pt. 1. From the Discovery of the Neutron to Nuclear Fission. 1. The State of Nuclear Physics in 1931. 2. Discovery of the Neutron. 3. Discovery of the Positron and Artificial Radioactivity. 4. Radioactivity Produced by Neutrons. 5. Discovery of Fission. 6. Nuclear Forces -- Pt. 2. Nuclear Instruments. 7. Nuclear Accelerators. 8. Gas Counters. 9. The Scintillation Counter. 10. Semiconductor Counters. 11. Beta-Ray Spectrometers. 12. Gamma-Decay. 13. Internal Conversion. 14. Beta-Decay -- Pt. 3. Nuclear Models. 15. The Nuclear Shell Model. 16. Collective Models. 17. Individual-Particle Models -- Pt. 4. Nuclear Reactions. 18. First Experiments with the Accelerated Particles. 19. Nucleon-Nucleon Scattering. 20. Low-Energy Nuclear Reactions