INTRODUCTION
Only completed cases of pneumonia treated at the U. S. Army Base Hospital, Fort Riley, Kan., during the seven months' period, Oct. 18, 1917, to May 18, 1918, are included in this report (Fig. 1). This series is made up of 668 instances of lobar pneumonia, 181 instances of measles pneumonia,1 and 22 instances of bronchopneumonia. During the period, Oct. 1, 1917, to May 18, 1918, there were 22,854 admissions, making a total incidence for pneumonia of 4.5 per cent. Of the 668 completed instances of lobar pneumonia, 154 patients died, a mortality of 23 per cent. Of these 154 deaths, 87 were complicated by empyema. The mortality of lobar pneumonia without empyema was therefore 12.7 per cent.During the period, Oct. 18, 1917, to May 18, 1918, 2,956 cases of measles were treated in this hospital. The total number of measles pneumonia has been 181, making, for the