The onset of pneumonia in this group of cases occurred from four to nine days after the onset of influenza and with few exceptions was ushered in by a chill and pain in the chest. In several instances the patient had apparently recovered from influenza as evidenced by fall of temperature to normal. After twenty-four to seventy-two hours of normal temperature the patient would have a chill and develop lobar pneumonia. In the majority of cases, however, lobar pneumonia developed while the patient was still sick with influenza. The course of the disease, symptomatology and physical signs were quite characteristic of lobar pneumonia and require no special comment. Recovery by crisis occurred in 21 cases, by lysis in 8. Pneumococcus empyema developed in 3 cases, fibrinopurulent pericarditis in 3 and all but 1 of these 6 cases terminating fatally. In Table XV 5 fatal cases of lobar pneumonia, which illustrate some of the unusual features of the disease when it follows influenza, have been summarized. The first 2 cases represent examples of recurring attacks of pneumonia which developed shortly after recovery from the first attack, in both instances being due to types of pneumococci different from those causing the first attack. The third case represents an example of superimposed infection of the lungs with hemolytic streptococci and staphylococci during the course of a pneumonia due to Pneumococcus IV and disappearance of the latter organism from the tissues so that it was not found at time of necropsy. The last 2 cases are examples of fulminating rapidly fatal cases of lobar pneumonia associated with mixed infections of pneumococci and hemolytic streptococci, the streptococci probably being secondary in both cases. Cases like the few examples cited above, which occurred not infrequently throughout the epidemic of influenza, serve to illustrate the difficulties which may be met in attempting to correlate the clinical, bacteriologic and pathologic features of pneumonia following influenza unless careful bacteriologic examinations are made both during life and at the necropsy table in the same group of cases. TABLE XV CASES OF LOBAR PNEUMONIA FOLLOWING INFLUENZA