JACKSON, JOHN HUGHLINGS English neurologist, was born at Green Hammerton, Yorkshire. In 1862 he became physician to the London Hospital and to the National Hospital for the Paralysed and Epileptic. Jackson utilized the ophthalmoscope in diagnosing brain disease (1863), studied aphasia, described unilateral convulsions (Jacksonian epilepsy), and in the Croonian lectures for 5884 on the evolution and dis solution of the nervous system originated the doctrine of "levels" in the evolution of the nervous system. He did much to advance
the notion of cerebral localization. A full list of his papers is given in the London Hospital Gazette for 1895. Jackson died on Oct. 7, 1911.