Examination of the lungs of a large number of individuals who have died as the result of pneumonia following influenza has disclosed a succession of acute and chronic diseases. Immediately succeeding the height of the epidemic of influenza, death occurred with acute lobar pneumonia or with diffusely distributed hemorrhagic bronchopneumonia caused in the majority of instances by Pneumococcus IV in association with B. influenzæ. Superimposed infection with hemolytic streptococci increased in frequency and in individuals who had occupied certain wards was almost invariable. At a later period, from one to two months following the maximum incidence of influenza chronic lesions, namely, bronchiectasis, unresolved pneumonia, and chronic empyema were common and often occurred as the result of influenza which had had its onset at the height of the epidemic. When influenza attacked the encampment, about 50,000 troops were quartered in it, and for a considerable period no more troops were brought into the camp and none left it. All cases of pneumonia occurring among these troops were brought to the base hospital so that the autopsies which were studied were representative of all the pneumonias following influenza in this limited group of men. It is noteworthy that autopsy disclosed no instance of fatal influenza unaccompanied by pneumonia. =Pneumonia of Influenza.=—Knowledge concerning the bacteriology of the pneumonia of influenza dates from the study of the epidemic of 1889–90. The frequency with which Diplococcus lanceolatus occurred in association with influenzal pneumonia was well recognized, although several observers, notably Finkler[57] and Ribbert,[58] found Streptococcus pyogenes so often that they attributed the pneumonia of influenza to this microorganism.