1: Science and Spectra in the Nineteenth Century; 2: Visible and Invisible Radiation, 1800-1825; 3: Joseph Fraunhofer, and the Measurement of Wavelength, 1820-1925; 4: Emission and Absorption, ca. 1800-1870; 5: Penetration of the Infrared, 1830-1910; 6: The Equilibrium Between Matter and Radiation, 1800-1925; 7: Atomic Spectral Series, ca. 1860-1920; 8: Molecular Spectra of Gases, Principally 1860-1890; 9: Empirical Generalizations and Early Quantum Theory, 1885-1925; 10: Structure, Force Field, and Dissociation, ca. 1914-1935; 11: The Convergence of Theory and Experiment, 1920-1930; 12: Symmetry, Spin, and Statistics, 1926-1930