Symposia on Theoretical Physics 4: Lectures presented at the 1965 Third Anniversary Symposium of the

Introductory Address.- Conserved Vector Currents and Broken Symmetries.- Multiplet Structure and Mass Sum Rules in the SU(6) Symmetry Scheme.- A New Approach to Scattering Theory.- Equivalent Potential Approach for Strong Interactions.- "Repulsive" Potential Approach to Pion Resonances.- A Model of a Unitary S-Matrix for Peripheral Interactions.- The Renormalizability of Higher Spin Theories.- Group Representations for Complex Angular Momentum.- Muon Capture by Complex Nuclei.- Comments on Sum Rules.- Inelastic Neutron Scattering and Dynamics in Solids and Liquids.- Axioms and Models.- Characters of Semi-Simple Lie Groups.- Sequent Correlations in Evolutionary Stochastic Point Processes.- Author Index.