THE new edition of Prof. Baly's “Spectroscopy” is modelled closely on the original plan. It has, however, been reset in a new format with a larger page, so that the number of pages in the first volume of the new edition is about 10 per cent, less than in the corresponding half of the preceding edition. Since the earlier portions of the book are concerned mainly with prism and grating spectroscopes, they have not needed any drastic emendation as a result of the recent developments in the theory of Spectroscopy; but attention may be directed to a useful table of standard wave-lengths, covering three pages of the new edition, and to the account that is given of recent work by McLennan and by Millikan on the extreme ultra-violet region of the spectrum.



    E. C. C.


    By. (Text-books of Physical Chemistry.) In 2 vols. Third edition. Vol.1. Pp. xi + 298. (London: Longmans, Green and Co., 1924.) 14s. net.

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    Spectroscopy . Nature 115, 153 (1925). https://doi.org/10.1038/115153d0

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