This report is based on an analysis of 100 consecutive cases of epidemic encephalitis from the records of the New York Neurological Institute Dispensary and Hospital and the Montefiore Hospital, New York. A considerable number of these cases were personally examined by the writers. The object was to determine the frequency of the association of pyramidal and extrapyramidal system involvement in a representative group of cases from both dispensary and hospital practice.
Of the 100 cases analyzed (Table 1), twenty were from the dispensary and eighty from the hospital service. While the dispensary cases were of a milder type, there was little difference between them, and no distinction is drawn between these two types of patients. The time of the examination varied with regard to the duration of the disease. Of the pyramidal group (Table 2), six were examined in the first month, two in the second, three in the