At two or three periods during her new life Edna has engaged in stealing. She has taken articles for which she had no particular use and has told lies about the matter. The thieving has not been a single event, but each time has seemed to represent a state of mind she has been in, and for a week or so numerous articles have been taken. We warned her good friend to make a study of her social and mental influences at such periods. It was found then that Edna was undergoing special stress on at least one such occasion. A young man had been making up to her, and later she confided that this given period was one of great turmoil because of the renewed arousal of many ideas about sex affairs. After this there was still more attempts to win Edna's confidence about her daily experiences, including such as the above. There has been the gradual development of character, and Edna is now, two years after she was taken from her bad environment, only very occasionally guilty of falsifying, and she is otherwise trustworthy. Our study of the causative factors of this girl's delinquency and particularly of her extraordinary lying led us to see that perhaps all of the following have a part: (a) Heredity. Father unknown. Mother a free-living woman. (b) Home conditions. Mental and moral bad influences in the home life on account of the foster mother conniving at stealing and being herself an extreme liar. (c) Psychic contagion from the atmosphere of lies in which the girl has been brought up. (d) Mental conflict arising from the suspicion of her parentage, early acquaintance with sex knowledge, and the irregular morale of her home life. (e) Bad companions, including her foster mother's friends, and boys and girls. --------------------------------------------------------------- Mental Conflict. Case 4. Girl, age 15 yrs. Home influences: Extremely bad, including excessive lying. Bad companions. Heredity (?). Delinquencies: Mentality: Much stealing. (Shop lifting, etc.) Fair ability. Excessive lying. False accusations. Sex immorality. --------------------------------------------------------------- CASE 5