Franceschetti has calculated that 0.12 per cent of men might be compound hemizygotes for red-green blindness. A new calculation suggests that 0.1338 per cent of men in Scotland might be such hemizygotes. A prediction of the possible types of colour vision defects of such men can be made and is given in this paper. Three previously published pedigrees are re-interpreted, in which possible hemizygotes occur, and it is pointed out that the colour vision of these men would accord with the predictions made, as would that of the two compound hemizygote brothers reported by Walls and Mathews.
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