The present study of prognosis in encephalitic sequelae has been motivated by an interest in the subsequent course of 51 carefully studied cases of encephalitis which were reported by Kennedy.1 Aside from any intrinsic value in terms of prognosis which this study may have, the hope of obtaining some additional tools for therapy has been kept in mind. A personal sense of helplessness in attempting to offer recommendations to parents who are burdened with a serious postencephalitic disorder of behavior on the part of a member of the family probably has been the strongest motivating factor. The practice usually has been for the family to endure the patient in the home as long as possible and then to send him to a state institution. Few states have adequate facilities for the management of such disorders, aside from simple custodial care, which is of great benefit to the patient's family