In 1932 the first complete classification of convulsions in childhood was presented together with a study of 419 cases.1 These cases were studied as thoroughly as facilities permitted. A detailed history was obtained of the family and of the patient. Blood counts, urinalyses, spinal fluid examinations and Wassermann tests were made on all patients. Blood chemistry studies, particularly determinations of sugar, calcium and phosphorus, and roentgenograms, including encephalograms, were made when they seemed indicated. Treatment was instituted and the patients were followed as long as possible. A revision of the original classification was presented in 1934 with the addition of eighty-one cases and a correction according to the age at the time of the first convulsion.2 An additional series of 500 cases has been similarly studied and a revised classification is here presented based on 1,000 cases. The frequency of convulsions in young children has long been a