Eighty-seven milk-borne outbreaks of scarlatina have been recorded in the U. S. A., 1893-1928, and 45 milk-borne outbreaks of septic sore throat, 1908-1928. Fifty-five % of all milk-borne outbreaks of scarlatina and septic sore throat recorded were in Massachusetts and New York. About 3/4 of the recorded outbreaks of both diseases had their onsets between December and May. In 82% of the outbreaks of scarlatina, a milk handler was the probable source of infection, as compared to 55% of the outbreaks of septic sore throat. In certain milk-borne outbreaks of both scarlatina and septic sore throat in Massachusetts, there was an unusual proportion of cases at age 15 and over. In the Lee outbreak of septic sore throat, a cow was found to be infected with Streptococcus epidemicus. In the Charlton outbreak (clinically, septic sore throat) the source of infection was the dairyman or his family, all of whom had scarlatina except the mother, who had a septic finger. No infected cow was found. In the Plymouth outbreak of scarlatina, the probable source of infection was a milk handler. Two cows were found to be infected. The bacteriological evidence showed conclusively that the Lee outbreak was caused by a streptococcus of epidemicus type. Studies of organisms from the throats of patients in the Charlton outbreak showed them to be definitely not of the epidemicus strain, but closely related to the scarlatin-iform strain. Cultures from the Plymouth outbreak of scarlatina, on the other hand, were reported of both the epidemicus and scarlatiniform types.