One Century of Physical Organic Chemistry: The Menshutkin Reaction (J.--L. Abboud, et al.). Angular Dependence of Dipolar Substituent Effects (K. Bowden & E. Grubbs). Electronic Configuration, Structure, and Solvation of Phenyl--Substituted Group 4 Anions (U. Edlund & E. Buncel). Transmission of Substituent Effects: The Through--Space and Through--Bond Models and Their Experimental Verification (O. Exner, et al.). Linear Solvation Energy Relationships: An Improved Equation for Correlation and Prediction of Aqueous Solubilities of Aromatic Solutes Including Polycyclic Aromatic Hydrocarbons and Polychlorinated Biphenyls (M. Kamlet). Indexes.