Abstract
BURT1 has given evidence of a small correlation between darkness of skin pigmentation and colour-vision weaknesses. Vernon and Straker2 have shown that red-green blindness is more common in the south and west of the British Isles, where the original dark-skinned inhabitants were pushed by the Nordic invaders. Geddes3 has shown that red-green blindness is less common among the natives of Fiji than among peoples of Caucasian stock. Clements4 has shown that red-green blindness is less common among American Indians and American Negroes than among American Whites.
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