(3) Forty-seven cases in the group studied presented the clinical picture of bronchopneumonia. The onset of pneumonia in these cases was in most instances insidious and appeared to occur as a continuation of the preceding influenza. The temperature, instead of falling to normal after from three to four days, remained elevated or rose higher, the respiratory rate began to rise, a moderate cyanosis appeared, the cough increased, and the sputum became more profuse, usually being mucopurulent and blood streaked, sometimes mucoid with fresh blood. The pulse showed little change at first, being only moderately accelerated. Pleural pain, so characteristic of the onset of lobar pneumonia, was rarely complained of, but a certain amount of substernal pain was common, probably due to the severe tracheobronchitis. Physical examination at this time revealed small areas showing relative dullness, diminished or nearly absent breath sounds, and fine crepitant râles. These areas usually appeared first posteriorly over the lower lobes. The subsequent course of the disease showed the widest variation from mild cases with limited pulmonary involvement going on to prompt recovery in four or five days with defervescence by lysis or crisis to those presenting the picture of a rapidly progressive and coalescing pneumonia with fatal outcome. In the milder cases the diagnosis of pneumonia depended in considerable part upon the general symptoms of continued fever, increased respiratory rate, and slight cyanosis. Definite pulmonary signs were always present if carefully looked for, though sometimes not outspoken. Areas of bronchial breathing and bronchophony often appeared late, sometimes not until the patient was apparently recovering. In the severe cases cyanosis became intense and an extreme toxemia dominated the picture. In certain of these cases there was an intense pulmonary edema. The respiratory rate showed wide variation, the breathing in some cases being rapid and gasping, in others comparatively quiet. Progressive involvement of the lungs occurred with the development of marked dullness, loud bronchial breathing and bronchophony. Abundant medium and coarse moist râles were heard throughout the chest, probably due in considerable part to the extensive bronchitis almost universally present. An active delirium was not uncommon. Signs of pleural involvement, even in the most severe and extensive cases, rarely occurred, except in those cases in which a hemolytic streptococcus infection supervened. Of the 47 cases in this group, 29 recovered; 14 by crisis, 15 by lysis. The average duration of illness from the onset of influenza until recovery from the pneumonia was ten days, the majority of these cases being relatively mild in character with pneumonia of three to six days’ duration. Empyema with ultimate recovery occurred in 1 of these cases, Pneumococcus Type II being the causative organism.