therefore, that in influenza-pneumonia all of the lung involved in the early peculiar inflammatory reaction need not pass through those stages and reactions as we recognize them in pneumococcus lobar pneumonia. The resolution taking place in the areas of serous and hemorrhagic pneumonia is accomplished largely by a reabsorption of the fluid, autolytic disintegration of the red blood cells and a certain amount of phagocytosis of red blood cells and their debris. This resolution is quite rapidly accomplished, and the clearing up of such an area may take place in a remarkably short period of time. The leucocytes and endothelial cells which are present with every such reaction become active in phagocytosis of bacteria, and we have repeatedly observed them crowded with small Gram negative bacilli, whose morphology is similar to that of the B. influenzæ. These areas contain but few bacteria of other kinds. The exudate in the alveolar walls is also simple in character and is readily removed. Slight suffusion of blood, serous fluid, and migrating cells may occupy portions of the alveolar walls during the acute reaction, but these, too, are easily removed and the tissue rapidly resumes its normal character. The vascular and lymphatic congestion again disappear and the tissues which once were soggy return to a normal state without leaving behind evidence of the pulmonary incapacity. The lining epithelium of trachea, bronchi and alveoli is restored by proliferation from the neighboring less injured parts. If this early stage in influenza-pneumonia is to be compared with the early reactions of endemic pneumonia, it is interesting to note with what ease the resolution may be accomplished in the former, whereas in the latter a further sequence of stages must apparently be passed through before the lung is cleared of its inflammatory products. As we have intimated before, the early exudate in these two types of pneumonia differs very essentially, the one being accompanied by much fibrin and leucocytes which are present only in small quantities in the pulmonary lesion of influenza.