. Carnegie Institution of Washington publication. OF A CERTAIN PENNSYLVANIA FAMILY. 87 individuals to 1 who is socially unfit and 1 on the border-line of fitness, whereas in the following generation all, that is a total of 47, are socially efficient. In Line D, the proportion of the socially unfit rises from being roughly one-half in generations 2 and 3, it becomes two-thirds in the two following generations. A census of the latest generation, 10 years hence, will undoubtedly further increase this ratio, since many of the markedly deficient couples are still reproducing, and most of their chil
. Carnegie Institution of Washington publication. OF A CERTAIN PENNSYLVANIA FAMILY. 87 individuals to 1 who is socially unfit and 1 on the border-line of fitness, whereas in the following generation all, that is a total of 47, are socially efficient. In Line D, the proportion of the socially unfit rises from being roughly one-half in generations 2 and 3, it becomes two-thirds in the two following generations. A census of the latest generation, 10 years hence, will undoubtedly further increase this ratio, since many of the markedly deficient couples are still reproducing, and most of their children, though apparently defective, are at present too young for accurate determination and representation in the v//'//////A ^"â â¢'"-â â "'- MM Fig. 1. Here the type of unfitness, too, shows considerable range, includ- ing vagrancy and petty criminality, sexual immorality, and in a few instances, alcoholism and imbecility. In Line E, on the contrary, there is the constant presence of social unfitness, generally in the form of imbecility, amounting to 100 per cent. The significance of these ratios will be further discussed in the section on marriage selection. In the same way, the ratio of the socially fit to the socially unfit in successive generations of Lines F and G have been calculated and represented graphically in figure 2. We find here a similar decrease in the proportions of the socially unfit, as we proceed from the earlier to the later generations. This decrease is less marked for Line F than for Line G, and in the former case has taken place by the failure of many of its deficient members (men) to secure life partners. It should be observed that in Line G the large proportion of the socially fit in generations 3 and 4 is reached by the inclusion of many dull and backward individuals. They are not aggressive and have not moved far from the original home of the family; many of them did not advance far at school, but they possess great vita
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