The theory of gravitation, whieh has been formulated in the framework of Einstein”s General Theory of Relativity, has an exceptional position in respect to modern ne Id theories, since it is formulated in a Riemannian space, which is determined by the motion of mass points and light rays. The attempt to construct a theory of gravitation on the same principles on which usually ne Id theories are based leads to a symmetrie tensor ne Id. Using the equations of motion for mass points and light rays, whieh serve also as measuring deviees for space-time intervals, the theory can be re formulated into a theory which contains exclusive Iy obserwable quantities. This theory is identical with Einstein”s theory of gravitation. The possibility to interprete Einstein”s theory of gravitation either as a theory in a Riemannian space or as a Lorentz-invariant neid theory in the Euklidian space, exists as we Il for local problems as for a few global pro blems, which are connected with the structure of the universe. Literatur [1] Heckmann, 0., und E. Schückung, in: Handbuch der Physik, Bd. LIII (S. Flügge ed.), S. 489, Berlin-Göttingen-Heidelberg, Springer 1959. [2] Heckmann, 0., und E. Schückung, Z. Astrophys. 38, 95 (1955); 40, 81 (1961). [3] Marzke, R. P., und]. A. Wheeler, in: Chiu, H. Y., und W. Hoffmann, Gravitation and relativity, p. 40, New York, Benjamin 1964. [4] Kundt, W., und B. Hofmann, in: Recent developments in general relativity, p. 303, Warschau: PWN 1962.
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