MESSRS. Adam Hilger, Ltd., 98 King's Road, London, N.W.I, have issued a bound book of eighty pages dealing with the theory and practice of absorption spectroscopy (price 5s. net, postage 3d.). It contains a brief theoretical introduction, then thirty-two pages of description of Hilger apparatus and description of technique, including work in the ultraviolet, visible, and infra-red regions, with a note on photoelectric methods, and the rest of the book deals with applications, particular attention being directed to biological aspects and analysis. This contains references to original literature. A companion volume, entitled “Recent Applications of Absorption Spectroscopy” (price, bound, 3s. 6d., postage 2d.), published by Messrs. Hilger, provides a very complete and carefully classified account of the literature from 1922 to 1931, with useful notes. The two publications form a handy yet compendious guide to the practice and literature of Spectrophotometry in all parts of the optical spectrum, and may be recommended to all interested in this branch of science.
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