In 1899 Freud wrote a revolutionary work in the new field of Psychoanalysis called, The Interpretation of Dreams.

The book was so full of technical details and involved case studies, however, that ordinary people had great difficulty understanding it. Twenty-one years later, he published this shorter version. Dr. Andre Tridon, who wrote the introduction to the new book, explains it this way, “Freud himself, however, realized the magnitude of the task which the reading of his magnum opus imposed upon those who have not been prepared for it by long psychological and scientific training and he abstracted from that gigantic work the parts which constitute the essential of his discoveries. The publishers of the present book deserve credit for presenting to the reading public the gist of Freud's psychology in the master's own words, and in a form which shall neither discourage beginners, nor appear too elementary to those who are more advanced in psychoanalytic study. Dream psychology is the key to Freud's works and to all modern psychology. With a simple, compact manual such as Dream Psychology, there shall be no longer any excuse for ignorance of the most revolutionary psychological system of modern times."