We have previously considered pneumonia, which is the principal complication with simple influenza, and the two are closely allied. As an end result of the pneumonia, non-resolution and fibrosis of the lung are of first importance. We cannot say very much on the treatment of this condition. The duration varied from a few to several weeks, and recovery was infrequent. Our treatment aimed at supplying as much nourishment as was possible to give, with, in addition, good nursing. The treatment otherwise was purely of a general hygienic type. Tepid sponging appeared to give considerable relief from the profuse sweating these patients so often had. Drugs were of value only for some local effect. We wonder if carefully handled vaccine therapy at the onset of such a complication might not prove of some value. The autogenous would be the one of choice. Empyema was not found to be as prevalent as one would imagine. With so much non-resolution of lung following the pneumonia we were surprised to see so little empyema. All delayed resolutions we explored with the needle, so we feel that the condition, if present, would have been recognized. The treatment of empyema need not be given any special emphasis. It is, as of old, a surgical affair. One or two new points in the technique have been brought out in the way of drainage, but possibly they have not been sufficiently tried to lay any stress upon them at present. Dakin’s solution in certain chronic cases appeared of value. Our empyema cases did well. Pleurisy with effusion was observed a number of times, although it has been our experience to find a very few large effusions. Pleural puncture often gave negative results, even when the signs did appear to indicate the condition. We aspirated the fluid when present. The end results were always good. In only one case did we have to repeat the aspiration for reaccumulation of fluid. Chronic bronchitis, accompanied at times with considerable dyspnœa, has been seen on several occasions. There is very likely associated with this condition some fibrosis of lung, and probably some organization of small bronchioles themselves. Expectoration has been variable, profuse or scanty, mucoid or purulent. We consider rest in bed, with as full a diet as possible to build up the general condition of the patient, the best form of treatment. These cases had little or no temperature, and consequently at first absolute rest was not considered necessary, but we now regard it as the essential part of the treatment. Atropine and heroin are of value at certain times. We confess to have seen very little benefit from the expectorants. We are rather surprised that this sequela is not of more frequent occurrence.