ILYA PRIGOGINE is Director of the Instituts Internationaux de Physique et de Chimie, E. Solvay, Brussels, Belgium. Dr. Prigogine is also the Ashbel Smith Professor of Physics at The University of Texas at Austin, where he is also Director of the Ilya Prigogine Center for Studies in Statistical Mechanics and Complex Systems. In 1977 he was awarded the Nobel Prize in Chemistry. STUART A. RICE is the Frank P. Hixon Distinguished Service Professor in the James Franck Institute and the Department of Chemistry of the University of Chicago.

• Kinetics and Dynamics of Hydrogen Adsorption and Desorption onSilicon Surfaces (D. Doren). Potential Energy Surfaces of Transition-Metal-Catalyzed ChemicalReactions (D. Musaev and K. Morokuma). High-Resolution Helium Atom Scattering as a Probe of SurfaceVibrations (S. Safron). Ordering and Phase Transitions in Adsorbed Monolayers of DiatomicMolecules (D. Marx and H. Wiechert). Indexes.

ILYA PRIGOGINE is Director of the Instituts Internationaux de Physique et de Chimie, E. Solvay, Brussels, Belgium. Dr. Prigogine is also the Ashbel Smith Professor of Physics at The University of Texas at Austin, where he is also Director of the Ilya Prigogine Center for Studies in Statistical Mechanics and Complex Systems. In 1977 he was awarded the Nobel Prize in Chemistry. STUART A. RICE is the Frank P. Hixon Distinguished Service Professor in the James Franck Institute and the Department of Chemistry of the University of Chicago.

• Kinetics and Dynamics of Hydrogen Adsorption and Desorption onSilicon Surfaces (D. Doren). Potential Energy Surfaces of Transition-Metal-Catalyzed ChemicalReactions (D. Musaev and K. Morokuma). High-Resolution Helium Atom Scattering as a Probe of SurfaceVibrations (S. Safron). Ordering and Phase Transitions in Adsorbed Monolayers of DiatomicMolecules (D. Marx and H. Wiechert). Indexes.

ILYA PRIGOGINE is Director of the Instituts Internationaux de Physique et de Chimie, E. Solvay, Brussels, Belgium. Dr. Prigogine is also the Ashbel Smith Professor of Physics at The University of Texas at Austin, where he is also Director of the Ilya Prigogine Center for Studies in Statistical Mechanics and Complex Systems. In 1977 he was awarded the Nobel Prize in Chemistry. STUART A. RICE is the Frank P. Hixon Distinguished Service Professor in the James Franck Institute and the Department of Chemistry of the University of Chicago.

• Kinetics and Dynamics of Hydrogen Adsorption and Desorption onSilicon Surfaces (D. Doren). Potential Energy Surfaces of Transition-Metal-Catalyzed ChemicalReactions (D. Musaev and K. Morokuma). High-Resolution Helium Atom Scattering as a Probe of SurfaceVibrations (S. Safron). Ordering and Phase Transitions in Adsorbed Monolayers of DiatomicMolecules (D. Marx and H. Wiechert). Indexes.