Abstract
Introduction. - Clusters of nebulae represent the largest aggregations of matter known. It may be expected that an investigation of their distribution in space, of their composition and physical properties will throw new light on such problems as the determination of nebular masses [1], on the red shift of light from nebulae and on the evolution of stars and nebulae as well as the evolution of the universe as a whole. For these reasons it was thought desirable to undertake a more concentrated study of clusters of nebulae than hitherto attempted. The first step of this program consists in securing more complete data on the number and the distribution of groups of nebulae containing two, three or more members up to clusters of many hundred nebulae. The new 18-inch Schmidt telescope of the California Institute of Technology promises to be an ideal instrument for the investigation of groupings of nebulae brighter than the sixteenth magnitude.
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