221 ular orbital localization degree. The aim of this work is to show, with the help of a few exampies, the possibilities offered by quantum chemistry for tackling the problems of crystal electronic structure, of crystallographic arrangements as well as their macroscopic shape, and of distortion effects caused by the presence of faces. In addition to results already published the book also contains a few original ideas and unpublished results. Of particular interest for researchers, instructors and students in solid-state physics, inorganic chemistry and crystallography.
Topics in Current Chemistry - vol. 77 - Inorganic and Physical Chemistry. 239 pages. Springer-Verlag, Berlin-Heidelberg-New York. 1978. Cloth DM. 98. The book presents three critical reviews of very interesting fields. "Surface Energy of Solids", by J.J. Bikerman, gives an extended discussion on theoretical approach and experimental methods. Only surface energy is mentioned in the title, but surface tension also is considered in the text. Of particular interest the discussion on cuticular energy of solids. "Trends and Applications of Thermogravimetry", by H.G. Wiedemann and G. Bayer, after a detailed presentation of apparatuses, accessories and experimental techniques, analyses with particular care the factors' (sample properties, and experimental parameters) which are of pronounced influence on the thermogravimetric curves and also in most of the thermoanalytical investigation. Some examples of application complete the review. "Determination of Molecular Weights by Light Scattering", by M.B. Huglin, discusses this method both from theoretical and from experimental point of view, emphasizing its versatility with respect to the possible number of variables in the system. The technique seems worthy of serious consideration for all concerned with macromolecular
222 characterisation. The book is strongly recommended to all research and industrial chemists who wish to keep abreast of advances in these topics.
UUrnanns Encyklopddie der technischen Chemic. Volumes 15 and 16 of this invaluable reference ~v_ork have just been published by Verlag Chemie, Weinheim-New York. Vol. 15, Korrosion bis Lacke. XVI, 726 pages, 508 figures and 157 tables. Subscription price DM 425; Final price DM 475. Vol. 16, Lagerwerkstoffe bis Milch. XVI, 735 pages, 323 figures and 191 tables. Subscription price DM 425; Final price DM 475.
Molecular and Crystal Structure Models. By A. Walton - 204 pages 1978. Ellis Horwood Ltd., Chichester, England (distributed by John Wiley and Sons Ltd.). Lst. 9.00. Structural models are artefacts in which the bonding arrangements between atoms and ions believed to exist at an atomic level are simulated. They are an invaluable aid in bridging the gap between the formal and concrete thought because the model represents an abstract idea but is itself "concrete". An understanding of structural chemistry is therefore greatly facilitated by the use of models. This book is an attempt both to survey most of the manufactured models, and also to give some hints on homemade ones, together with references. The author has an important experience in using models as aids in both teaching and research. Probably no book has so far been published which attempts to cover the whole, range of model types as this one does. Such kind of guide is very useful, as some mod-