Paranoid delusional reactions have seldom been reported in chronic encephalitics, in contrast to the commonly occurring schizophrenia-like reactions. Apart from the cases described by Kwint (1), Ostmann (2), McCowan (3, 4), and a reference by Neustadt (5) to an undescribed case, there seem to be few, if any, references in the literature until a recent paper by Brody and Freed (6) describing a case where obsessive ideas became temporarily converted during oculogyric crises into a paranoid condition. The present case therefore seems worth putting on record, the more so in that the patient's unusual intelligence helped to throw some light on the relationship between oculogyric crises and post-encephalitic mental disorder, a subject which has been discussed by Stern (7), Jelliffe (8), and more recently by Wexberg (9) and by Brody and Freed (6).