This study was undertaken, first, to determine the prevalence of the different serologic groups of hemolytic streptococci in specimens collected in this vicinity; and, second, to obtain additional data on the correlation between certain biochemical tests and the group precipitin reaction of Lancefield (1933). A total of 561 cultures was studied of which 188 were isolated from material from human infections, 53 from normal persons, 8 from infected animals, and 312 from raw milk. Several such studies have been made since the Lancefield technic has been available. A similar survey of cultures from human and animal sources was reported by Coffey (1938). Butler (1938), Plummer (1935), Reid and Browne (1939) and Kobayashi (1939) have studied cultures derived chiefly from a variety of human sources. Among others who have classified hemolytic streptococci by the precipitin test are: Hare (1935), Davis and Guzdar (1936), Foote, Welch, West and Borman (1936), and Kodama, Ozaki, Nishiyama and Chiku (1938), who studied cultures from the nose and throat; Hare and Maxted (1935) and Smith and Sherman (1938), who examined human feces; Lancefield and Hare (1935), Rolfs, Trussell and Plass (1938), and Congdon (1935), who collected strains from the vagina and respiratory tract of parturient women; Colebrook, Maxted and Johns (1935), whose cultures were secured from human skin; and Plastridge and Hartsell (1937), Valentine (1938),