Full text: Problems in eugenics

Exhibit C 54—56.25 
born. Also in well-to-do families, where the age of fathers at the 
time of procreation is materially higher, the first born are more 
frequently myopic than their brothers or sisters.” 
A large amount of material has been treated by W. Weinberg, 
in which tuberculous and non-tuberculous families are compared. 
Figure C 55—influence of numerical position of birth on infant C 
mortality and Figure C 56—mortality of the first and later born. 
Weinberg writes concerning these : “ The parallelograms in the first 
row indicate for each position in order of birth how many children 
out of every hundred die before the age of 20. On this, however, 
Mortality of Children According to Sequence of Birth. 
3,129 Tuberculous and 1,830 Non-Tuberculous Families of Stuttgart, 
1873-1889 (after Weinberg). 
nontuberculpustuberculous 
Percentage of chil- Death rates expressed Percentage of chil­ 
dren born alive who in relative figures cor- dren born alive who 
died before reaching rected for differences died before reaching 
their 20th year. in the death rates in their 20th year, 
families differing in 
size.Death rates expressed 
in relative figures cor­ 
rected for differences 
in the death rates in 
families differing in 
size. 
Paternal family, 
■ft-1* 
the difference in the mortality in families with different numbers of 
children has an influence. To counteract this, it has been calcu­ 
lated how many children in each position would die if within each 
family the number of children had no influence, and the actual 
number of deaths expressed as a percentage of the expectation 
calculated in this way gives parallelograms to the second row. 
After eliminating the influence exercised by the size of the family, 
the increase of the mortality with the higher birth number appears
	        

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