=Early Beginnings.= In 1882, when Freud was the assistant to Dr. Breuer of Vienna, there was brought to them for treatment a young woman afflicted with various hysterical pains and paralyses. This young woman's case marked an epoch in medical history; for out of the effort to cure her came some surprising discoveries of great significance to the open-minded young student. It was found that each of this girl's symptoms was related to some forgotten experience, and that in every case the forgetting seemed to be the result of the painfulness of the experience. In other words, the symptoms were not visitations from without, but expressions from within; they were a part of the mental life of the patient; they had a history and a meaning, and the meaning seemed in some way to be connected with the patient's previous attitude of mind which made the experience too painful to be tolerated in consciousness. These previous ideas were largely subconscious and had been acquired during early childhood. When by means of hypnosis a great mass of forgotten material was brought to the surface and later made plain to her consciousness, the symptoms disappeared as if by magic. =A Startling Discovery.= For a time Breuer and Freud worked together, finding that their investigations with other patients served to corroborate their former conclusions. When it became apparent that in every case the painful experience bore some relation to the love-life of the patient, both doctors were startled. Along with most of the rest of the world, they had been taught to look askance at the reproductive instinct and to shrink from realizing the vital place which sex holds in human life. Breuer dropped the work, and after an interval Freud went on alone. He was resolved to know the truth, and to tell what he saw. When he reported to the world that out of all his hundreds of patients, he had been unable, after the most careful analysis, to find one whose illness did not grow from some lack of adjustment of the sex-life, he was met by a storm of protest from all quarters. No amount of evidence seemed to make any difference. People were determined that no such libel should be heaped on human nature. Sex-urge was not respectable and nervous people were to be respected. Despite public disapproval, the scorn of other scientists, and the resistance of his own inner prejudices, Freud kept on. He was forced to acknowledge the validity of the facts which invariably presented themselves to view. Like Luther under equal duress, he cried: "Here I stand. I can do no other." =Freudian Principles.= Gradually, as he worked, he gathered together a number of outstanding facts about man's mental life and about the psycho-neuroses. These facts he formulated into certain principles, which may be summed up in the following way. 1 There is no _chance_ in mental life; every mental phenomenon--hence every nervous phenomenon--has a cause and meaning.