The study of the psychopathology of repressed hostilities in relation to hypertension suggested to the author the possibility of finding elevated blood pressure in two groups of psychotics: a group of depressed psychotics who are self-accusatory and turned the hostility against themselves and the group of paranoid cases who defended themselves against their hostility by accusing others of aggressive tendencies toward them. Altogether one hundred ninety-three psychotic patients were studied. Sixty of them were paranoid, thirty-three depressed and twenty-three schizophrenic. In a second group of seventy-seven cases the author succeeded on the basis of his observation and experience to predict the blood pressure accurately. The study suggests that where there is a chronic psychological tension arising out of chronic inhibited hostile impulses chronic elevation of the blood pressure may result. Those patients with a high degree of passive regression throw little strain on the cardiovascular system.