Dynamical groups and their currents.- Current algebra and lightlike charges.- to the Lagrangian method.- to the method of current algebra.- S-Matrix formulation of current algebra.- Electromagnetic mass differences.- Nonleptonic decays and Mass differences of Hadrons.- Current algebra in the framework of general quantum field theory.- Current algebra and renormalizable field theories.- to current algebra.- Realisations of a compact, connected, semisimple lie group.- Problems in Vector Meson theories.