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Some of the corresponding combinations of singlet terms and of intercombinations between singlet and triplet terms of Pb III have been found by the writer. A more comprehensive account of the spectra of mercurylike atoms will be given at a later date. In conclusion, the writer wishes to thank Dr. R. J. Lang for the use of his list of wave-lengths and to acknowledge a grant from the National Research Council of Canada. [Professor H. N. Russell has kindly suggested that an estimate of the ionization potential of Tl+ derived from the difference between the (6s6s) 'So and (6s7s) 'So terms might be added. On the assumption that these terms follow a simple Rydberg series the lowest 'So term is found to have the value 173350, corresponding to an ionization potential of 21.4 volts. In the case of Hg I a similar calculation gives for the lowest 'So term a value, which is five per cent higher than that obtained from the sharp series of singlets. If a similar error exists for Tl II the ionization potential would be 20.3 volts. This value is rather higher than the estimate of 19.8 volts, which has been made by the writer on the basis of the general progression of term values for mercury-like atoms. The ionization potential of Pb++, it might be added, is approximately 31.3 volts, if it is assumed that the term value of (6s6f)3F4 of Pb III is 63500.] 1 Fowler, A., Series in Line Spectra, p. 148. 2 Smith, S., Proc. Nat. Acad. Sci. 14, 878, 1928. 3Carroll, J. A., Phil. Trans. Roy. Soc., A225, 357, 1925. 4Rao, K. R., and Narayan, A. L., Proc. Roy. Soc., A119, 607, 1928.

The Influence of the Presence of Hydrogen on the L111 X-ray Absorption Edge of Palladium