Professor Freud developed his system of psychoanalysis while studying the so-called borderline cases of mental diseases, such as hysteria and compulsion neurosis. By discarding the old methods of treatment and strictly applying himself to a study of the patient's life he discovered that the hitherto puzzling symptoms had a definite meaning, and that there was nothing arbitrary in any morbid manifestation. Psychoanalysis always showed that they referred to some definite problem or conflict of the person concerned. It was while tracing back the abnormal to the normal state that Professor...