[Illustration]Source: Publications of the Astronomical Society of the Pacific, Vol. 31, No. 184 (December,1919)Published by: The University of Chicago Press on behalf of the Astronomical Society of the PacificStable URL: http://www.jstor.org/stable/40693172 .

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This content downloaded from 195.78.108.186 on Mon, 26 May 2014 17:19:29 PMAll use subject to JSTOR Terms and Conditions