Investigation in a series of experiments performed at the University of Ohio's Physics Laboratory. Chapter titles are ...(1) Introduction ...(2) Conductivity [including models of doping induced insulator-metal transition and models for localization and metallic conductivity] ...(3) Structural Order ...(4) Density of States ...(5) Temperature Dependent Conductivity ...(6) Thermoelectric Power ...(7) Microwave Dielectric Constant ...(8) Optical Absorption, Transmission and Reflection ...(9) Ultimate Conductivity ...(10) Applications ...(11) Summary ...(12) Glossary of Terms.