This book chronicles the proceedings of the Symposium on Acid-Base Interactions: Relevance to Adhesion Science and Technology held on the occasion of the 75th birthday of Professor Frederick M. Fowkes as a part of the 64th Colloid and Surface Science Symposium held at Lehigh University, June 18--20, 1990. The book contains 22 papers which are divided into three sections. Topics covered include: Acid-base concepts: historical account, current status, and prospects for the future; quantum-mechanical approach to understanding acid-base interactions at metal-polymer interfaces; assessment of acidbase interactions at solid-liquid interfaces; quantitative characterization of the acid-base properties of solvents, polymers and inorganic surfaces (overview by Professor Fowkes); acid-base characteristics of a variety of solid materials (clay minerals, carbon fibers, glass fibers, silicas, metals, polymers); acid-base interactions in wetting; applications of acid-base interactions in a variety of situations, e.g. in the adhesion of polymers to metallic and ceramic substrates, mechanical properties of wood, properties of filled polymers, and behavior of fiber-reinforced polymer composites.