Your PDF has successfully downloaded.
You may be interested in finding more content on these topics:
You are not currently logged in.
Access JSTOR through your library or other institution:
Our Universe of Stars
The Scientific Monthly
Vol. 9, No. 6 (Dec., 1919), pp. 506-513
Published by: American Association for the Advancement of Science
Stable URL: http://www.jstor.org/stable/6845
Page Count: 8