This paper presents the results of a study of the motions of early-type stars in the galactic disk and within 3 kpc of the sun. The work was undertaken to investigate the general question of whether the stars and gas in the solar vicinity exhibit similar motions. In particular, studies were made to determine (1) whether the radial-velocity distribution of these stars, as a function of longitude, is similar to the radial-velocity distribution exhibited by the 21-cm hydrogen emission; (2) whether the variation of the circular velocity about the center of the galaxy of these stars is similar to the rotation curve determined from 21-cm observations; and (3) whether these stars show a systematic motion radial from the center of the galaxy.
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