The book Modern stie-exclusibrt ii+idchronzaiograp& is not just another book in the rapidly expanding literature on liquid chromatography. It is the first comprehensile treatise on size+zx elusion chromatography (SEC), and as such fills an importtt gap in the existing literature. The authors succeed in distilIing into slightly less than 500 pages the essence of twenty years of SEC research and practice. The book presents a totally integrated, critical, in-depth treatment of the subject, It reviews its history, but focusses on the modern aspects of the technique_ SEC is viewed in the context of the whole field of liquid chromatography, as well as in its relationship to other techniques of poIymer molecular characterization. The treatment of the methods of gel permeation and gel filtration chromatography have been integrated. The book combines theory of retention, resolution and column packing design with practical know-how of equipment, operating variables, laboratory techniques and data handlidg. Special techniques, su'ch as preparative and small-molecule separations and recycle SEC are treated as well. One chapter deals wi*& the SEC application to synthetic polymers. It does not attempt to give a comprehensive account ofthe reportt application literature but is oriented towards illustrating the value and types of information available from SEC. The treatment of gel filtration is less successful. Its coverage in one chapter is too short, but this detracts little from the overall value of the book. .AIi the important references are included, and the various chapters abound in iliustrations from the general SEC literature. With its scos and depth, the book is destined to become +-he "bl%Ie" of sizeexclusion chromatography for years to come.