Owing to 2,772 New Caledonian blood donors and pregnant women, a study was made of the salient features of the H. B. s. antigen carrier state; percentages of carriers showed no difference according to the age and a slight difference between sexes. These percentages proved to be quite different according to ethnic groups. Smaller rates of carriers were found among Europeans (1.1%) than among Melanesians (7.6%) as well as Polynesians (7.7%). There is a relation between H. B. s. carrier state and positive treponema serology, the latter occurring more frequently among melanesian and polynesian groups.