Abstract
galactic plane is distinct, but moderate compared to that of the Oand B-type stars. Such a distribution indicates that the planetary nebulae are part of the disk population II. Effects of interstellar absorption on the observed distribution are clearly recognizable. This is the extent of the information that can be obtained without knowledge of the distance of individual planetary nebulae. Similarly, radial velocities of planetary nebulae give some information on the kinematics of the sub-system without knowledge of individual distances. Still unpublished radial velocities of 225 planetaries observed by Mayall at the Lick Observatory and by Minkowski at the Mount Wilson and Palomar Observatories raise to over 300 the number of planetary nebulae with known radial velocities. If the radial velocities relative to the local stand-
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