IT is 20 years since Lipschutz et al.1 showed that the high percentage of B blood groups found in Fuegians by Rahm2 was incorrect. We decided to complete this investigation in about a hundred of the Indians who will gradually be made extinct by our civilization. Seventy-four Fuegians with stressed mongoloid features, forty-five Alacalufes from Puerto Eden (Wellington Island) (parallel 49° S.) and twenty-nine Yaganes from Puerto Williams (Navarino Island) (parallel 55° S. in Tierra del Fuego) were the subjects. Fig. 1 shows their geographical locations. The Onas (Patagones in Argentina) mixed with this tribe three generations ago. The extreme ages of the subjects were 8 months to 85 years and all except three were less than 50 yr old. At present their purity level is less than the 50 per cent established by Lipschutz3 in 1935. The Alacalufes live more isolated lives and they have mixed much less with Chileans and foreigners.
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