ABSTRACT
This paper is reproduced from Publ. Astron. Soc. Pac., Vol. 29, p. 206 - 207 (1917) to celebrate the centenary of the Publications. A comparison with new developments is given in 161.129.
Heber D. Curtis
© 1988. The Astronomical Society of the Pacific. All rights reserved. Printed in U.S.A.
, , Citation Heber D. Curtis 1988 PASP 100 6 DOI 10.1086/132128
This paper is reproduced from Publ. Astron. Soc. Pac., Vol. 29, p. 206 - 207 (1917) to celebrate the centenary of the Publications. A comparison with new developments is given in 161.129.