This work presents a wide range of experimental data on the composition and transport properties of fluid under crustal conditions. It includes a number of studies of ore metal solubilities at elevated pressures and temperatures. The text also discusses studies of fluid transport at high pressures and temperatures, including permeability studies of various rock types, and the chromatographic effects that may modify fluid chemistry as it moves through rock. It pays particular attention to experimental techniques. The text should be useful to researchers in geochemistry, ore deposits, geothermal energy and waste disposal.