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THE fire assay method is used universally for the determination of silver in ores and concentrator products. This method, which is capable of very high, precision, is subject to a loss of silver during cupellation, and corrections for this loss, if made, must be on an empirical basis depending on the conditions of cupellation1–3. Walsh4 showed that atomic absorption spectroscopy offered possibilities as an absolute spectrochemical method freed from the necessity of using chemically analysed standards or synthetic samples the composition of which approximated that of the unknown. Several papers5–7 on the application of atomic absorption spectroscopy to the determination of cations in solution have been published. These papers showed that, in general, the atomic absorption technique was free from interelement effects and required the minimum amount of manipulation. Lockyer and Hames8 directed attention to the possibility of determining the noble metals by atomic absorption spectroscopy and quoted a limit of detectability of 0.1 p.p.m. for silver.

X-Ray Spectroscopy: An Introduction. By B.K. Agarwal. Pp.418. (Springer: Berlin, Heidelberg and New York, 1979.) DM74; $40.70.

Atomic Absorption, Fluorescence and Flame Emission Spectroscopy: A Practical Approach. By K. C. Thompson & R. J. Reynolds. Pp. 319. (Charles Griffin: London and High Wycombe, UK, 1978.) £15

Electron Spectroscopy of Crystals. By V.V. Nemoshkslenko and V.G. Aleshin (translated from Russian by Irina Curelaru). Pp.360. (Plenum: New York and London, 1979.) £31.19.

Molecular Spectra and Molecular Structure By Gerhard Herzberg. Vol. 3: Electronics Spectra and Electronic Structure of Polyatomic Molecules. Pp. xviii + 745. (Princeton, N.J.: D. Van Nostrand Company, Inc.; London: D. Van Nostrand Company, Ltd., 1966.) 160s. Developments in Applied Spectroscopy Vol. 5. Edited by L. R. Pearson and E. L. Grove. (Proceedings of the 16th Annual Mid-America Spectroscopy Symposium held in Chicago, Ill., June 14–17, 1965.) Pp. x + 506. (New York: Plenum Press, 1966.) $18.50.

Spectroscopy and Molecular Structure By Gerald W. King. Pp. xiv + 482. (London: Holt, Rinehart and Winston, 1964.) 86s.