M. is one of these helpless ambivalent folk, always running to others for advice and perplexed to a frenzy by the choices of life. "What shall I do?" is his prime question, largely because he fears to commit himself to any line of action. Once a man chooses, he shuts a great many doors of opportunity and gambles with Fate that he has chosen right. M. knows this and lacks self- confidence, i.e., the belief that he will choose for the best or be able to carry it through. He lacks the gambling spirit, the willingness to put his destiny to fortune. Often M. deliberates or rather oscillates for so long a time that the matter is taken from his hands. Thus, when he fell in love, the fear of being refused, of making a mistake, prevented him from action, and the young woman accepted another, less ambivalent suitor. M. is in business with his father and is entirely a subordinate, because he cannot choose. He carries out orders well, is very amiable and gentle, is liked and at the same time held in a mild contempt. He has physical courage but has not the hardihood of soul to take on responsibility for choosing. Sometimes he gets good ideas, but never dares to put them into execution and shifts that to others. He hates himself for this weakness in an essential phase of personality but is gradually accepting himself as an inferior person, despite intelligence, training and social connection. Yet his sister is exactly the opposite type. She makes decisions with great promptness, never hesitates, is "cocksure" and aggressive. If M. is ambivalent, his sister B. M. is univalent. Choice is an easy matter to her, though she is not impulsive. She rapidly deliberates. She never has made any serious errors in judgment, but if she makes a mistake she shrugs her shoulders and says, "It's all in the game." Thus she is a leader in her set, for if some difficulty is encountered, her mind is quickly at work and prompt with a solution. If she is not brilliant, and she is not, she collects the plans of her associates and chooses and modifies until she is ready with her own plan. Her father sighs as he watches her and regrets that she is not a man. It does not occur to him or any of his family, including herself, that she might do a man's work in the business world. In pathological cases the inability to choose becomes so marked as to make it impossible for the patient to choose any line of conduct. "To do or not to do" extends into every relationship and every situation. The patient cannot choose as to his dress or his meals; cannot decide whether to stay in or go out, finds it difficult to choose to cross the street or to open a door; is thrown into a pendulum of yea and nay about speaking, etc. This psychasthenic state, the folie du doute of the French, is accompanied by fear, restlessness and an oppressive feeling of unreality. The records of every neurologist contain many such cases, most of whom recover, but a few go on to severe incurable mental disease.