Metal-Ammonia Solutions contains the proceedings of an International Conference on the Nature of Metal-Ammonia Solutions Colloque Weyl II held at Cornell University in Ithaca, New York, on June 15-19, 1969. The papers explore the nature of metal-ammonia solutions and cover topics ranging from the dilemma of metal-ammonia models to the magnetic properties of metal-ammonia solutions, the reactions of such solutions, and solid metal-ammonia compounds. This monograph is comprised of 39 chapters and begins with an overview of models for the concentration dependence of the properties of dilute metal-ammonia solutions. The discussion then turns to a continuous dielectric model for the solvated dielectron in dielectric media; elementary electronic excitations in insulating liquids; and magnetic properties of metal-ammonia solutions. The chapters that follow focus on the kinetics of the reaction between sodium and ethanol in liquid ammonia; electrons trapped in solids; metal-nonmetal transition and phase separation; and optical spectra of alkali metal-ammonia solutions. This text will be a valuable resource for chemists and chemistry students.