Full text: Problems in eugenics

26Exhibit C 56—57. 
considerably smaller. Figure C 56, which compares the mortality of 
the first and last born children, is to a certain extent a test of this. 
This shows clearly a considerably higher death rate in the last born. 
Relative Mortality of the First and Last-born. 
3,129 Tuberculous and 1,830 Non-Tubf.kculous Families of Stuttgart, 
1873-1889 (after Weinberg) 
Of each ico living-born there died before reaching their 20th year : 
C 57Paternal Family 
Maternal FamilyNon-tuberculous Tuberculous 
Non-tuberculous Tuberculous 
Comparison of the mortality of the First and Last-born, 
The mortality of the First-born = 100, 
Paternal Family 
Maternal FamilyNon-tuberculous Tuberculous 
Non-tuberculous 
Tuberculous 
FIRST-BORN ■■■ LAST BORN 
Figure C 56. 
Both figures indicate that children of the same numerical position of 
birth show a higher mortality, if from tuberculous families. 
Of a materially greater influence than the numerical position of 
birth or the number of children in each family is the length of 
interval between births. We point at first to Figure C 57_interval 
between births and child mortality, after Ansell and Westergaard, by 
Dr. A. Bluhm. She writes in reference to it: “ Ansell has demon­ 
strated, from the material of the National Life Assurance Society of 
London, that a child has an increasingly better chance to survive his 
first year, the greater the interval between his own birth and that of 
the child born before him. If this interval is less than a year, the 
infant mortality is double what it is when there is an interval of two 
years (15.75% against 7-33%)- This influence makes itself felt
	        

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