CWROM.5624 Gel Permeation Chvomatogya$hy, edited by KLAUS H. ALTGELT AND LEON SEGAL, M. Dekker, Inc, New York, 1971, 646 pp., price $ 24.75. The preface states that this book contains the proceedings of the American Chemical Society Symposium on Gel Permeation Chromatography, that the papers have already appeared in several issues of Sefiaration Science during rg7o-1g7r and that the symposium constituted part of the 159th Amer. Chem. Sot. National Meeting, Houston, February 22-27, 1970. It does not state why it was decided to republish these papers in book form at a moment when publishers have realised that such double publications have repeatedly roused the ire of librarians, who often cannot discover from a catalogue that a given title contains, matter which they already have in their libraries. For those who are interested in such a re-publication it can be said that the volume is well printed and has adequate author and subject indices. The price is that of a regular book, which is odd, as the printing costs should have been much less. &abqratorio’di