The following table indicates the leucocyte count for our series, comprising the epidemic in all of its phases. There are a few general points which appear striking that we may refer to at this time, and leave until later the discussion of the minor details. One-third of the counts, including, as they do, many cases of pneumonia, showed a leucopenia, while 70 per cent. of the total number fell under 10,000. This last group contains more pneumonias and other complications than simple influenza. But 5 per cent. of the cases counted showed more than 20,000. All of these undoubtedly had pneumonia or some other complication. Comparing this finding with our experience in the past before the epidemic with the pneumococcic lobar pneumonia, one sees at once that, as far as this type of clinical observation is concerned, the two pneumonias are totally different. The writer remembers but one case of lobar pneumonia which showed a persistent white count falling below 10,000. Certainly in this community lobar pneumonia and low leucocyte counts were unusual combinations until the present epidemic. Further, the evident depression of leucocytosis even where there was an actual increase is indicated by 95 per cent. of our counts being below 20,000. This leads us to state that the pneumococcus, although present in practically all of our pneumonias, produced in only a small percentage of the bloods we examined its characteristic increase. The toxic factor of this influenzal epidemic certainly causes a marked change in the white cells of the blood. TABLE V