E. S------, aged twenty-four, consulted me for various symptoms dependent on amenorrhoea in May, 1889. She was pale, somewhat anaemic, ate and slept fairly well, but suffered from nearly constant frontal headache. She had seen nothing for five months, and thought the cause of this was a chill incurred at the time of the last period. She had taken iron and quinine and used hot baths without effect. She was hypnotized, and at once fell into a profound state of somnambulism. I rubbed the abdomen, and suggested that the period should come on the following week, without pain, and should last three days. These suggestions were repeated daily, with the addition that the day of the week (Friday) was suggested after the second visit. Early on the following Saturday morning the function was re-established, and lasted three days.