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t he spectroscopy of transition-group complexes, Kihara the interact.ions of convex molecules, Koide and Oguchi t he magnetic properties of compounds, Liehr forbidden t.ransitions, :l\IcLennan the formal statist.ical theOl'~' of t.l'Unsport proces es, Scrocco the interpretation of quaClrupole coupling data, and finally Widom the collision t heory of reactiolt rates.This reviewer foulld t he contributions by IGhara and Widom the most st.imulating and interesting. The former is a clear :1ccount of how measured quantities such as the second virial coefficient, the diffusion coefficient, 01' the crystal st.ruc ture of mo lecllles may be interpreted on the basis of a model which takes intermolecula r for ces as acting, not between the molecular centers, but between convex cores assumed to exist inside the molecules. Widom gives n penetrating and exceptionally welI-written account of recent developments in the collision theory of bimolecular reactious. For in. tance, he discusses how the redistribution of molecules into inlel'llal states, such as occur:; in the vibrat.ional relaxation of diatomic molecules, is perturbed when c!issociatioll also takes place.As is customary in books of this type, there is no particular connect.ion between t.he various articles, and they are written in whatever forlll most appeals to the nuthor. The result is eO'ecLively a jou l'llal of U lII'ela ted review articles. Each co ntribu-t·ion should be of interest to so me groups of readers, but few will want to read them all, or even most of them, with more th:1n superficialatlention.

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