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Kristalle und Gesteine, ein Lehrbuch der Kristallkunde und allgemeinen Mineralogie by P. Eskila

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International Union of Crystallography
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Abstract

Kristalle und Gesteine, ein Lehrbuch der Kristallkunde und allgemeinen Mineralogie by P. Eskila 132 BOOK R of the elements of the periodic table, conveniently arranged at the end of the book, make these tables still more practical. l~ost wave-lengths have been measured by several authors in different laboratories all over the world. I t is not always clear why the present authors in their survey of the l iterature have chosen the particular data presented, but in general the choice is of no great practical importance as the corresponding numbers do not differ very much. D. COSTER Natuurkundig Laboratorium der Rijksuniversiteit, Groningen, Holland Four ie r Techn ique in X - ray Organic Structure Analysis. By A. D. BOOTH. Pp. 106, with 49 figs. Cambridge: Un ivers i ty Press. 1948. Price 12s. 6d. The appearance of this book is to be greeted w~th great satisfaction. I t treats a central and very important problem in structure analysis, which has not previously been the subject of a comprehensive account. Further- more, the book is written by a scientist who has himself made valuable contributions to the field in question. The title of the book only mentions the structure analysis of organic compounds. Although these without doubt will furnish the main material for structure determinations in years to come and certainly are the only substances with structures sufficiently complicated to warrant the use of the most developed methods, this restriction seems unnecessary. Moreover, it has no support in the text, which treats the subject quite generally. The book assumes that the reader has a knowledge of the basic facts of crystal lography and of X-ray diffraction. I t starts with a condensed account of the interaction of X-rays with matter and then describes the representation of electron density by Fourier series. Next comes a treat- ment of the methods for obtaining approximate structures: the use of isomorphous series, the location o

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