Introduction. Commercial Glasses: Vitreous Silica. Commerical Glasses. Thermodynamic and Thermal Properties: Density. Surface Tension. Coefficient of Thermal Expansion. Heat Capacity. Thermal Conductivity. Mechanical Properties: Viscosity. Elastic Properties. Microhardness. Strength. Electrical and Transport Properties: Electrical Conductivity. Dielectric Properties. Ionic Diffusion. Other Properties: Refractive Index and Dispersion. Solubility, Permeability, and Diffusion of Gases in Glass. Chemical Durability. Estimation of Properties. Appendices. Systems Index. Subject Index.