Originally published in 1970 and in contrast to the previous three volumes, which each dealt with a single subject, this volume is a miscellaneous one.Seventeen subjects were selected on the basis of their relevance for the understanding both of psychoanalytic theory and of human behaviour in general. In this volume the reader can follow the development of Freud’s theories regarding important subjects such as Fixation, Regression, Cathexis, Conflicts, Anxiety, Ambivalence, Reality Testing, Transference and Counter- Transference. Some of these subjects were chosen because of the many misconceptions and misunderstandings that surrounded them. As in previous volumes, the development of each concept is described from its conception to Freud’s final formulation and detailed references are given for the guidance of the student, the psychoanalyst, the psychiatrist, the social worker, the psychologist and the general reader.