Includes bibliographical references (pages 158-159) and index.

Part I. The Special Theory of Relativity. Physical meaning of geometrical propositions -- The system of coordinates -- Space and time in classical mechanics -- The Galileian system of coordinates -- The principle of relativity -- The theorem of the addition of velocities employed in classical mechanics -- The apparent incompatibility of the law of propagation of light with the principle of relativity -- On the idea of time in physics -- The relativity of simultaneity -- On the relativity of the conception of distance -- The lorentz transformation -- The behavior of measuring-rods and clocks in motion.

Part II. The General Theory of Relativity. Special and general principle of relativity -- The gravitational field -- The equality of inertial and gravitational mass as an argument for the general postulate of relativity -- In what respect are the foundation of classical mechanics and of the special theory of relativity unsatisfactory? -- A few inferences from the general principle of relativity -- Behavior of clocks and measuring rods on a rotating body of reference -- Euclidean and noneuclidean continuum -- Gaussian coordinates -- The space-time continuum of the special theory of relativity ocnsidered as a euclidean continuum -- The space-time continuum of the general theory of relativity is not a euclidean continuum -- Exact formation of the general principle of relativity -- The solution of the problem of gravitation on the basis of the general principle of relativity.

Part III. Considerations on the Universe as a Whole. Cosmological difficulties of Newton's Theory -- The possibility of a "finite" and yet "unbounded" universe -- The structure of space according to the general theory of relativity.

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