IN THIS ISSUE: Molecular Thermodynamics: A Compromise That Works /2 (An historical perspective of a current research area in the School of Chemical Engineering at Cornell is given by Jorge C. G. Calado, visiting professor from the University of Lisbon.) ... Predicting Liquid Properties: A Three-Front Assault on a Fundamental and Practical Problem /9 (Keith Gubbins, who led in the development of the research program, discusses its major aspects and significance.) ... Fluids and Their Phases: Experimental Studies at High Pressures /18 (William B. Streett describes his experimental work and points out the industrial and scientific usefulness of phase equilibrium thermodynamics, with special reference to extraction with supercritical gases and to studies of the great gaseous planets in the solar system.) ... Developing Better Polymers: A Job for Molecular Engineers /27 (An application of engineering at the molecular level is discussed by Claude Cohen of the Cornell chemical engineering faculty.) ... Vantage /34 (Now in his forty-sixth year of association with chemical engineering at Cornell, former School director Charles C. "Chuck" Winding is interviewed by Donald F. Berth.) ... Register /39 ... Faculty Publications /44 ... Letters /48