thousand women between fifteen and forty-nine years of age was 634; in 1900 it was only 474. The proportion of children to potential mothers in 1900 was only three-fourths as large as in 1860. In the north and west of the United States the decline has been regular, while in the south the change has been less regular and the decline less marked. A comparison is made between the proportion of children in the foreign-born population and in the American. The former was 710 to the latter's 462. In the coloured population the proportion of children is greater than in the corresponding white population.
There can be no doubt whatever that, from the eighteenth century to the twentieth, there has been a steady decrease in the size of the American family. Franklin, in the eighteenth century, estimated that the average number of children to a married couple was eight; genealogical records show that, while in the seventeenth century it was nearly seven, it was over six at the end of the eighteenth century. Since then, as Engelmann and others have shown, there has been a steady decrease in the size of the family; in the earlier years of the nineteenth century there were between four and five children to each marriage, while by the end of the century the number of children had fallen to between four and but little over one. Engelmann finds that there is but a very trifling difference in this respect between the upper and the lower social classes; the average for the labouring classes at St. Louis he finds to be about two, and for the higher classes a little less. It is among the foreign-born population, and among those of foreign parents, that the larger families are found; thus Kuczynski, by analysing the census, finds that in Massachusetts the average number of children to each married woman among the American-born of all social classes is 2.7, while among the foreign-born of all social classes it is 4.5. Moreover, sterility is much more frequent among American women