[378] Proc. Roy. Soc., 103A, 413, 1923.

[379] M. N. R. A. S., 83, 404, 1923.

[380] H. C. 258, 1924.

[381] H. C. 252, 256, 1924.

[382] Phil. Mag., 47, 209, 1924.

[383] Chapter I, [p. 21].

[384] Proc. Phys. Soc. Lond., 36, 94, 924.

[385] [P. 45].

[386] Ap. J., 59, 197, 1924.

[387] See, for instance, H. J. H. Fenton, Outlines of Chemistry, 128, 1918.