"Collected Works" is a series of collections of significant writings and studies by the Austrian neurologist, depth psychologist, cultural theorist, and critic of religion, Prof. Dr. Sigmund Freud (1856 - 1939). Freud is regarded as the founder of psychoanalysis, through which he gained worldwide recognition. He was one of the most influential thinkers of the 20th century, whose theories and methods are still widely discussed today. The present fifth volume includes the essays "Three Essays on the Theory of Sexuality," "Contributions to the Sexual Life and Neurosis Theory," as well as "Metapsychology." The Publishing House of Sciences publishes historical literature by both well-known and lesser-known scientific authors. This makes works that have long been out of print accessible again to interested readers. This book is an unaltered reprint of the long out-of-print edition.