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Modern Spectroscopy, 2nd edition, by J.M. Hollas; Wiley, Chichester, 1991, pp. xxi + 407, price g39.50 (hard cover), %14.50 (paperback). This text book, aimed primarily at undergraduate students, introduces a wide range of spectroscopic methods, including the background theory and applications to structure determination and chemical analysis. The techniques covered include rotational, vibrational, electronic, photoelectron and related spectroscopies, as well as the theory of lasers and a selection of laser spectroscopies. In this new edition, the author has added new material in a number of sections: largely analytical techniques of inductively coupled plasma atomic emission and X-ray fluorescence spectroscopies have been added, the discussion of Fourier transform methods has been expanded (although the reader will have to search for the description of IV-Raman, which is separated from the other FT methods and not listed in the index), symmetry conditions for molecular chirality and non-zero dipole moment have been introduced, the discussion of vibrational potentials with more than one minimum has been expanded, and the alexandrite and titanium-sapphire lasers have been added to the relevant section. The book remains an excellent, up-to-date text on spectroscopy at the undergraduate level. A.J.B. Concepts and Applications of Molecular Similarity, edited by M.A. Johnson and G.M. Maggiora; Wiley Interscience publication, John Wiley & Sons, New York, 1990, pp. xix + 393, price 5251.35. This book collects together twelve papers on molecular similarity and its applications to reactivity and drug design, drawn from a symposium on Computer-based Methods of Molecular Similarity. The book, however, is not a standard congress proceeding. On the contrary, it gathers together wide-ranging and comprehensible articles and overviews. The book is oriented towards a broad spectrum of readers, although it is also of great interest to specialists, who will find excellent overviews, various points of view, techniques and theories related to molecular similarity, all brought together in one volume. Many examples are presented to clarify the theoretical explanations. Reading the book, the reader can appreciate the excellent editing in this work. Furthermore, two advantages will be apparent: the book fills a gap in the field of molecular similarity and collects together an important number of lectures and subjects normally dispersed in many papers in the scientific literature. The book is divided into several sections: the first two chapters introduce the subject; the following two chapters are devoted to calculations of