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Summary of a paper read at a Symposium on Radio Astronomy at the Autumn Meeting of the National Academy of Sciences, November 17, 1959. Other papers from the symposium, by J. H. Oort, R. Minkowski, and J. A. Giordmaine, appear on pages 1-19 and 267-275 (Vol. 46).
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Permanent address: Harvard Radio Astronomy Station, Fort Davis, Texas.