The second classification shows a slightly higher incidence for cases during the acute stage of the disease, regardless of whether they were admitted to the measles service from camp or from another service of the hospital (2.4 per cent). These findings conform with those at Fort Riley in a smaller series of cases and support the opinion that the hemolytic streptococci temporarily disappear from the throat during the acute onset of measles. Unfortunately controls among normal men in Camp Pike were not taken at intervals throughout the period of three months represented by this study of measles, but all controls taken show a higher incidence than that found among measles patients on admissions over a period of time comparable to that of the control series. The gradual increase in the percentage of patients developing hemolytic streptococci in their throats in wards receiving only streptococcus free cases demonstrates that the admission culture and the subsequent weekly cultures, with the separation of all patients identified as carriers, did not suffice to control the spread of streptococcus in this group of cases. It is interesting to note that the greatest incidence of streptococcus carriers among these patients occurred three weeks after the height of the measles epidemic, when it became about four times that observed at the height of the measles epidemic. When we consider the time relations of the streptococcus complications, it is noteworthy that they begin to appear somewhat after the appearance of streptococcus carriers and then increase parallel with the increase in the numbers of carriers. The relative number of complications developing among the first carriers which were identified is less than that among the carriers appearing later. This suggests an increase in virulence of hemolytic streptococci attending their wider dissemination. Tables LXII and LXIII are introduced for the purpose of showing to what extent duration of stay in the hospital increases the individual’s chances of acquiring hemolytic streptococci. Table LXII includes all cases admitted to and treated in the measles wards. On repeated cultures, previous positives and negatives were cultured alike and the total positives reported for each week. Table LXIII includes only those cases treated in the “clean” wards and known to be negative on previous culture. TABLE LXII INCIDENCE OF HEMOLYTIC STREPTOCOCCI IN THROATS OF MEASLES CASES WITH REFERENCE TO PERIOD IN HOSPITAL (All cases treated in the wards)