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Published online by Cambridge University Press: 03 August 2017
1 van de Hulst, H. C. and Burgers, J. M., editors, I. A. U. Symposium No. 2 (North-Holland Publishing Company, Amsterdam, The Netherlands, 1955).Google Scholar
2 See reference 1, p. 154.Google Scholar
3 See reference 1, p. 145.Google Scholar
4 See reference 1, pp. 127–129.Google Scholar
5 Hall, J. S. and Mikesell, A. H., Publ. U. S. Nav. Observ. 17, Part I (1950).Google Scholar
6 Hiltner, W. A., Astrophys. J. 114, 241 (1954).Google Scholar
7 Hiltner, W. A., Astrophys. J. Suppl. II, No. 24, 389 (1956).Google Scholar
∗ Note added by editor in proof .—Dieter's thesis, Harvard, 1958, presents evidence for a halo in M 33. Peak emission —4°K; velocity dispersion —50 km/sec; density ∼0.1 M H within radius 34 kpc; total halo mass ∼3% mass M 33.Google Scholar
8 Biermann, L., Kosmische Physik , edited by Heisenberg, W. (Springer-Verlag, Berlin, 1953), second edition, Chap. I. 4.Google Scholar