This compilation of 16 selected papers sets forth the author's analysis of and contributions to ego psychology especially in relation to the causes and treatment by psychoanalysis of the psychoses. The volume is divided into 3 parts the first of which consists of 5 papers on ego feelings and the dream. Part II, 9 papers, deals with the problems of treatment in schizophrenia and the manic-depressive psychosis. Part III, 2 essays, considers the ego in relation to narcissism. Federn's bibliography is listed by title on pages 365-369.(PsycInfo Database Record (c) 2023 APA, all rights reserved)