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Published online by Cambridge University Press: 01 January 1998
James questions the validity of the very tentative statement made in the final sentence of our paper. Our claim concerned the proportion of twins in Britain in the 1990s that might have arisen through subfertility treatment and was linked to the s uggestion that the natural twinning rate might still be in decline. If this were true, we, like James, would regard that prospect with concern.