Theoretical Lectures.- Ericson Fluctuations and the New Argonne Data on ?N Scattering.- Asymptotic Freedom and Color Superconductivity in Dense Quark Matter.- Duality Transformation and Confinement in Gauge Theories.- Thermodynamics of Nuclear Matter from the Statistical Bootstrap Model.- The Bag Model and Quantum Chromodynamics.- Quarks and Fermionic Geometry.- Nuclear Fireballs in Heavy Ion Collisions.- A Critique of Astrophysical Applications of Hagedorn's Bootstrap.- Particle Production in Soft and Hard Hadronic Collisions. Is There Evidence for Hadronic Constituents?.- From Hadron to Quark Matter.- Supersymmetry Approach to the Unification of Interactions.- The Infra-red Behaviour of the Running Coupling Constant in Yang-Mills Theories.- Seminars on Specialized Topics.- A New Viewpoint on De Sitter Gauge Invariance in Gravity.- Limiting Temperature, Lifetime, Size of the Centrally Produced Hadronic Matter and its Astrophysical Implications.- Evidence for Two Body Break-up at a Unique Temperature in High Energy P-Xe and P-Kr Collisions.- On the Application of Fields with Continuous Mass Parameter.- A Classical Theory of Strong Interactions (with "Confinement").- Energy-Momentum Distribution in e+e? Annihilation.- Exponential Mass Spectrum and Pion Condensation.- A Field Theoretic Description of Clusters as an Approximation to the Statistical Bootstrap Model.- "Small", "Large", and "Very Large" Transverse Momenta in a Unified Hydrodynamical Description.- Contributors.

This book originated in the Workshop on "Hadronic Matter at Extreme Energy Density," held at the Ettore Majorana Center in Erice, October 13-21, 1978. The lectures have been expanded to their present size, and the contributions of seven seminars have been represented by abstracts which should stimulate the reader's interest and guide him to the original literature. The title of the book perhaps does not fully represent its content but still is a good indication of the conceptual motiva­ tion of our Workshop. The development of physics in recent years has filled in the first details of the grand design which was initiated with the theory of general relativity and aspires to a synthesis of all the different interactions. However, this development has not been a linear one but .has followed a divided pattern: general relativity had its phenomenological domain in cosmology and had little to do with high-energy elementary particle physics. It was progress in the knowledge of symmetries in particle physics that fueled the advance toward the present formulation of supergravity, thus help­ ing to heal this historical separation. The great program would not have advanced so far if our attention had all the time stayed focused at infinity, where the great issues are.