In a terse preface Nagera tells us that this book arises out of the Clinical Concept Research Group at the Hampstead Child Therapy Clinic. This group has been concerned with ordering Freud's ideas, clarifying old concepts and terminology. Negera apparently intends this book as a clarification, in this spirit, of Freud's and Freudian ideas, not as a statement of anything particularly new. In the first chapter, true to the Hampstead research projects, he has carefully presented to us everything Freud has written on the obsessional neuroses from 1895 to 1939. Nagera has catalogued his quotations and paraphrases under succinct headings, so that the book becomes a very useful bibliographical aid to any student of Freud. One can look up Freud's concepts on onset or etiology, aggression or regression, the oedipus complex, the defenses, the difference from hysteria,