Abstract
At the present time there are very few populations, whose members do not practise contraception at all, or only to a very limited extent, and for whom accurate data on nuptiality and fertility exist. Among populations of European residence or origin, there are only a few groups who reject any limitation of families for religious reasons. One of these, the Hutterites, has already been studied; the other, the Old Order Amish, is studied in Ericksen's papers, and my preceding remarks point to the importance of this study.

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