A O Barut (ed) Dordrecht: D Reidel 1974 pp 281 price Dfl 65 This volume contains a collection of lectures by a number of authors on various topics in group theory applied to modern theoretical physics. There are lectures by R Penrose on relativistic symmetry groups (the orthogonal, conformal BMS groups and twistor theory), by M Carmelie on the role played by SL(2,4) in general relativity, by M Halpern and S Malin on the problem of classifying coordinate systems in Riemannian space-time, by H Tilgner on the theory of symmetric spaces and their use in relativity and quantum theories, by W Ruhl on analytic representations of Lie groups, by B Gruler on the subalgebras of the Lie algebra of SO(7), by A Barut on the use of the conformal group as an internal and external symmetry to obtain a mass spectrum in hadron physics, and finally by P Zweifel on nonlinear transport theory.