Presents a relativistic theory of gravity constructed as a field theory of the gravitational field within the framework of special relativity theory. The author begins with the hypothesis that a universal characteristic of matter the energy-momentum tensor serves as the source of gravity. He also considers the equations of motion for the gravitational field proper, Mach's principle, and the evolution of the homogeneous and isotropic Universe. Annotation c. by Book News, Inc., Portland, Or.