FOOTNOTES:
[1] International Atomic Weights, 1917.
[2] Aston, Isotopes, 1922; Phil. Mag., 47, 385, 1924; Nature, 113, 192, 856, 1924; Ibid., 114, 273, 716, 1924. Products of radioactive disintegration are omitted.
[3] Clarke and Washington, Proc. N. Ac. Sci., 8, 108, 1922.
[4] Bohr, Naturwiss., 11, 619, 1923.
[5] Sommerfeld, Atombau und Spektrallinien, 3d. edition, 286, 1922.
[6] A. Fowler, Proc. Roy. Soc., 105A, 299, 1924.
[7] Sommerfeld, Atombau und Spektrallinien, 3d edition, 457, 1922.
[8] Meggers, Kiess, and Walters, J. Op. Soc. Am., 9, 355, 1924.
[9] A. Fowler, Report on Series in Line Spectra, 1922; Bakerian Lecture, 1924.