[388] Lindemann, quoted by Milne, Observatory, 44, 264, 1921.

[389] Milne, Observatory, 44, 264, 1921.

[390] Chapter VI, [p. 94].

[391] C. R., 171, 1106, 1920.

[392] Russell, Ap. J., in press.

[393] A. S. King, Mt. W. Contr. 247, 1922.

[394] A. S. King, Mt. W. Contr. 233, 1922.

[395] Ap. J., 57, 20, 1923.

[396] Mt. W. Contr. 225, 1922.

[397] Mt. W. Contr. 236, 1922.