NEW BOOKS Chromatography. enlarged edition. Michael Lederer. D. Van Nostrand Ave., New York $12.75.
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ANALYTICAL CHEMISTRY
2nd revised and Edgar Lederer and xx + 711 pages. Co., Inc., 257 4th 10, Ν. Υ. 1957.
The first edition of this book was pub lished in 1953 and had three printings. Since that time the field of chromatog raphy has expanded and developed con siderably, so that this second edition is enlarged. The book is not a detailed discussion of the theory of chromatography, which the authors feel is covered amply in other texts. Rather, it is based on papers which contribute either to development of new methods, or appli cations of chromatography to new groups of substances over the last 10 or 12 years. Coverage is accomplished in 44 chapters in five divisions on adsorption, ion exchange, partition chromatog raphy, chromatography of organic sub stances, and chromatography of inor ganic substances. References dis cussed in the text include those up to as late as 1956. The number of references is 3074, almost exactly double that of the first edition. A separately appended refer ence list has 43 entries. These include only those which have been published since the current edition went to press. The book has many tables of R/ values, and is illustrated by 139 figures.
Electron Microscopy; Proceedings of the Stockholm Conference, September, 1956. F. S. Sjostrand and J. Rhodin, editors, xi + 354 pages. Academic Press, Inc., I l l Fifth Ave., New York 3, Ν. Υ. 1957. $17.50. The conference on electron micros copy held at Karolinska Institute in Stockholm, Sept. 17 to 20, 1956, heard presentation of 176 papers. This book consists of a collection of 138 of those papers, each printed in its language of original presentation—English, German, or French. The titles are divided in 14 categories, as follows: instrumentation; electron optics; electron-specimen inter action ; high resolution electron micros copy and electron diffraction; speci men preparation techniques in biology and medicine; cell ultrastructure, gen eral; nerve cells and receptors; muscle and other contractile elements; col lagen, cartilage, bone; pathology; mi-
