Dr. Weiss deserves gratitude for having collected and carefully edited Paul Federn's contributions to ego psychology and to the psychopathology and therapy of the psychoses. A comprehensive introduction and the excellent synopses preceding the articles provide a valuable guide through Federn's writings. Coming from a colleague and friend who knew the author's mind better than anyone else, they are of great help for the understanding of the many interesting observations and of the metapsychological theories presented in this volume. Federn was an excellent clinical observer and an original thinker. His studies in ego psychology, and in particular in the changes of ego functions in the psychoses, have established for him an honourable place among the psycho-analytic pioneers in their field. They have an important bearing on the psycho-analytical treatment of the psychoses. This book will be welcomed by the growing number of psychiatrists actively engaged in this work.