The right cerebral hemisphere has been removed in a few patients in order to extirpate completely a large glioma.1The following observations were made on a right-handed woman after the removal of the left cerebral hemisphere because of extensive infiltration by a tumor. REPORT OF CASE History. —Mrs. A. C., a white woman aged 43, was first admitted to the surgical service of the Peter Bent Brigham Hospital on June 22, 1933. For the preceding two weeks she had complained of heaviness and numbness of the right foot when walking. This disability followed an attack of vertigo, and the symptoms had become more severe after a second attack of vertigo. Coldness over the dorsum of the right foot and absence of pulsations in the right dorsalis pedis artery were found by physical examination. Neurologic examination gave negative results. On entry the blood pressure was 170 mm. of mercury systolic