Full text: Problems in eugenics

4Exhibit C 8—n. 
C 9 & 10 
C 11the mortality of the children up to the age of 20. It is based on 
the same material as Table 7 and proves : “ With the increasing 
age of the parents child mortality decreases, especially so in the 
case of the children of the tuberculous, and the number of children 
reaching the age of sexual maturity increases correspondingly.” 
Age at Death of Parents and Mortality of the Children up to 
the Age of 20 (including Stillborn). 
Non-tuberculous. Tuberculous. 
Deaths per 100 living-born children : 
under 30 40 50 60 70 under 30 40 50 60 70 under 30 40 so 60 70 under 30 40 50 60 70 
30yrs. 40 50 60 70 100 30yrs.40 50 60 70 100 30yrs.40 5 0 60 70 100 30yrs. 40 50 60 70 100 
Age at death of father of mother of father of mother 
Figure C 8. 
The same is proved by the two Tables C 9 and 10 by Ploetz 
referring to age at death of fathers and mothers and child 
mortality up to the age of five years. Very striking in both 
these tables is the extremely iow mortality of the offspring of the 
parents with the greatest longevity. 
Table C 11 by Weinberg : Hereditary of the disposition to beget 
twins (Archiv fiir Rasseo & Gesellschafts Biologie VI. 1909) is 
remarkable. “ The difference in favour of sisters speaks for 
Mendel’s law of dominance and recessivity. The more twins a 
woman has borne, the more frequently the same phenomen is found 
in her nearest female relations.” That the mortality among twins 
is very great is a well-known fact. 
Inheritance of Tendency to bear Twins. 
About 2,000 families from Wurtemberg family registers (after Weinberg). 
In every 100,000 Births Twin Births occur in the following numbers : 
Total population 
Among daughters 
,, mothers 
,, sistersof mothers 
of twins 
Figure C 11.2135

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