Symmetry of Crystals Introduction; Concepts of Group Theory; Crystal Symmetries; Group Theoretical Treatment of Crystal Symmetries; Scattering of X-Rays by Crystals; Lattice Vibrations of Crystals Lattice Vibrations of Crystals; Thermodynamics of Lattice Vibrations; Effects of Lattice Vibrations on X-Ray Scattering and Neutron Scattering; Optical Spectroscopy of Crystals: Interaction of Radiation with Matter; Optical Spectra of Impurities in Solids I; Optical Spectra of Impurities in Solids II; Interaction of Light with Lattice Vibrations: Infrared Absorption and Inelastic Light Scattering; Lattice Vibrations and Lasers;