This volume is another in a series of "instant books" containing the papers presented at a specific meeting. The date of the fourth Salzburg conference is not given. Thirty-five papers by the more than 60 participants were presented in six major headings. The attempt to organize the data is in general successful, but this volume has the many defects of all such "compilations." In many ways this book is better than average. Most of the chapters are short and contain essential elements without rehashing previously published data. Some repetitions occur, but they do not appear excessive.
The chapters concerning changes in small vessels of the brain in cerebral vascular disease, and particularly the chapter on the blood supply and angio-architecture, are quite good, as are those on the intracerebral steal syndromes. Three chapters are devoted to methods for measuring cerebral blood flow, but the chapter "Sources of Error in External