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'This book is written for psycho-analysts as well as for mathematical philosophers.' This is the opening first sentence of the preface. It is probably extremely important to make clear to those who might be tempted to read this book—and I hope they will be many—that psychoanalysts suspicious of the application of mathematical logic to psychoanalysis or worried because of their lack of basic knowledge in logico-mathematics and symbolic logic need not entertain such doubts. Through and through the book is about psychoanalysis and written by a psychoanalyst with considerable clinical experience. The logico-mathematical treatment of the subject is made easy because every logico-mathematical concept used is simple and simply explained from first principles. On the other hand, the logico-mathematical expert will find psychoanalytical principles and clinical examples also as clearly set as one could possibly desire. Because of this double preoccupation of the author one could at first sight find some aspects of the book repetitive—as the author himself says—but in fact this is not really so. This method of presentation is very necessary because each renewed examination of the facts brings the emergence of new knowledge from old material of