After our experience in the epidemic of pneumonia in the spring of 1918, when the disease was also so prevalent in the cantonments, we of course expected to see many cases of empyæma and lung abscess in the present epidemic. In this we were agreeably disappointed. Only one case of empyæma and only one case with abscess of the lung were found up to the time of collecting our data and the compiling of our statistics. Both of these were among the civilians. From our experience since the compiling of our statistics, we are inclined to believe that this low incidence of empyæma may not altogether represent the real state of affairs, as we have since received in the hospital several cases of empyæma, as well as of abscess of the lung, which seemed to have followed an influenzal infection which had occurred three or four months previously. One of these cases was a particularly remarkable one, in that the patient had already been admitted to the hospital twice since his initial attack of influenza in October for suspected pleurisy with effusion. We were unable to find any fluid with the needle, though we felt certain of having demonstrated it a number of times physically and with the X-ray. About eight weeks after the second admission, however, pus was found after several needlings in the left chest, axillary space, apparently along the inter-lobar sulcus. This case was a good example of many we have seen in which a pneumonia, or possibly, as we see it now, a pleurisy, or even a localized empyæma, seemed to confine itself about the sulcus or fissure between the upper and lower lobes of the lung. Frequently the process began posteriorly, apparently at the apex of the lower lobe, and traveled forward and downward across the axillary space until it appeared in the anterior part of the chest. In most cases we interpreted our signs as those of a consolidated lung, and scarcely knew whether the consolidation was in the upper part of the lower lobe or in the lower part of the upper, or in both. In some cases we suspected a localized empyæma or an abscess in the sulcus, but in none did we find pus after exploring with the needle until this recent case occurred. The passage of the needle in this case, which was done several times before pus was found, always gave the impression that it was going through dense fibrous tissue for some distance before the abscess was finally found. From this experience, and from the extensive and irregular invasion of the pleura which we have seen demonstrated at autopsies, there can be no doubt that the clinical history of the complications of influenza in this epidemic is not a closed chapter.