families that are dying out in the more substantial residence section which their fathers created in the eastern part of the city.
And it can hardly be supposed that the city, and the nation, of the future, would not benefit by a change in the distribution of births, whereby more would come from the seventh ward and its like, and fewer from the sixth and its like.
Evidently, there is no difficulty about seeing this form of natural selection at work, and at work in such a way as greatly to change the character of one section of the species. For comparison, some figures are presented from European sources. In the French war budget of 1911 it appears that from 1,000 women between the ages of 15 and 50, in different districts of Paris, the number of yearly births was as follows:
| Very poor | 108 |
|---|---|
| Poor | 99 |
| Well-to-do | 72 |
| Very prosperous | 65 |
| Rich | 53 |
| Very rich | 35 |