. Annual report of the Board of Regents of the Smithsonian Institution . ight certainly still be made againstthe generality of this statement. In fact, the scarcity of spectroscopic data is thecause that, though the determination of the solar motion separately for as the stars of determinate magnitude and proper motion is quite pos-sible, it has not yet been carried through. As a consequence the results used inwhat follows still rest on the assumption that the centers of gravity of all thegroups considered are at rest relative to each other. That this assumptionmust be probably tru
. Annual report of the Board of Regents of the Smithsonian Institution . ight certainly still be made againstthe generality of this statement. In fact, the scarcity of spectroscopic data is thecause that, though the determination of the solar motion separately for as the stars of determinate magnitude and proper motion is quite pos-sible, it has not yet been carried through. As a consequence the results used inwhat follows still rest on the assumption that the centers of gravity of all thegroups considered are at rest relative to each other. That this assumptionmust be probably true, follows from the near identity of the direction of thesuns motions, furnished by the several groups. ^ For many of the stars used the proper motion is still not known. What isknown, however, is the percentage of the stars of each magnitude having adetermined proper motion. This knowledge enables us to put in every box therequired number of cards showing a determined proper motion, and this is allthat is wanted in what follows. STRUCTURE OF THE UNIVERSE KAPTEYN. 309.
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