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266 problem of Laplace concerning the finite propagation of gravitation, and has concluded, contrary to Laplace’s negative result, that the propagation of gravitation with the velocity of light can be brought into consistency with the facts of observation owing to the partial compensations which are now introduced into the theory. Such questions are in the highest degree subtle and intricate as well as interesting. What it is desired to point out is that the developments of modern physical theory concern the astronomer no less than the physicist.