"... if offspring of poor parents, adopted when newly born into well-to-do and well-educated families, turn out markedly different from the birthright members of those families then the presumption is that the dullness, of whichever is the duller, is a saturated growth. If on the other hand they all turn out much alike there is no proof that growth is saturated for any of them. There remains the presumption that the conditions have been much alike for all the members of one family and we get a more uncertain but still useful comparison of native worth, as pointed out above. A thorough study of a hundred such cases of adopted children would do more to reveal the nature of the poorer than statistics of 100,000 poor persons brought up in poverty."