_P. H._ The patient was bright and passed successfully through high school. For seven years prior to the psychosis she worked for the same company as clerk. She was described as efficient, conscientious, systematic, though sometimes upset by her work; as lively, talkative, cheerful, with somewhat of a temper and easily hurt, also as quite religious. She was more attached to her mother than to her father, but still more to her older sister, whose death precipitated her psychosis. She never had any love affair and was said not to have cared for men. Two months before admission, when her favorite sister was confined, the patient was quite worried about her, but relieved when she heard good news. A few hours later, however, the sister died suddenly. When the patient learned of the sister’s death, she screamed, and screamed several times at the funeral. She did not cry, said she could not. After this she slept poorly, seemed nervous, went to church more, but there was no other change. She continued to work and, according to the employer, worked well. Nine days before admission she would not get out of bed in the morning, said little and refused food. A few days later she was induced to take a walk, but she seemed to have no interest in anything. When she talked at all it was about her sister and of wanting to go to a convent. When asked to do anything she said she would if it were God’s will. She did not menstruate after her sister’s death. When practically recovered, the patient attributed her breakdown to this tragedy. She added to the description above given that, soon after losing her sister, she had a fright at home. “It was the house in which my father died and one day when I was in bed I thought somebody came in.” But she denied a vision and could not further explain. At the _Observation Pavilion_ she was very inactive, so that she had to be fed and cared for in every way, mute, often covering her head with a sheet, turning away when questioned and resistive when the physical examination was attempted. But at times she smiled or laughed.