Sections from the left lower lobe and from the right lung showed both necrotization and organization. The alveoli contained an exudate, fibrinous, serous, and hemorrhagic, but predominantly leucocytic. There was slight necrotization of alveolar walls in some areas with infiltration of leucocytes in them and in the interstitial tissue. Several sections showed a marked degree of interstitial organization (Fig. XLVI). The bronchi were filled with a purulent exudate which sometimes involved the walls to form a peribronchial abscess. The walls of other bronchi showed great thickening with infiltration of both mononuclear cells and leucocytes, and many saccular dilatations were found (Fig. XII). The post-mortem blood culture showed a small, gram-negative, hemoglobinophilic bacillus (B. influenzæ). Cultures from lungs and bronchi yielded hemolytic streptococci, and Staphylococcus aureus was also present in the lung. _Summary._ Of the ninety-five cases included in this report, twelve showed the reparative process in a more or less marked degree. Furthermore, the twelve showing organization had an illness averaging twenty-seven days in duration, whereas for the eighty-three cases in which there was no organization, the period of illness averaged nine days. Thus, it appears that the early fatal termination of the disease in the latter group is responsible for the absence of organization. With one exception, when organization was encountered, the disease had run a relatively acute course without marked remission until death. In this instance, the fatal outcome was the result of an accident at a time when all the clinical evidence pointed toward a subsidence of the acute disease. The history of this patient is abstracted below, for it may throw light upon possible relapse and upon late, chronic, respiratory changes. _Autopsy No. 163._ A white male, aged 35 years, was admitted to the New Haven Hospital on December 5, 1918, complaining of “cough, pain in the chest, and headache.” For six days he had had fever, chills, and severe frontal headache, and for three days pains in the chest. He had also had “coryza” and epistaxis. The family and past histories were unimportant.