FOOTNOTES:
[412] Adams and Kohlschütter, Mt. W. Contr. 89, 1914.
[413] B. A. N. 19, 1922.
[414] Milne, Phil. Mag., 47, 209, 1924.
[415] Pannekoek, B. A. N. 19, 1922.
[416] Pop. Ast., 31, 88, 1923.
[417] Pop. Ast., in press.
[418] B. A. N. 19, 1922.
[419] In Pannekoek’s notation, a is surface brightness, is radius, and , surface gravity.
[420] Stewart, Pop. Ast., in press.
[421] Pub. Dom. Ap. Obs., 3, 1, 1924.
[423] H. C. 258, 1924.
[424] Adams, Pub. A. S. P., 28, 278, 1916; Adams and Joy, Pub. A. S. P., 36, 142, 1924.
[425] Pub. Solar Phys. Com., 1910.