Full text: Problems in eugenics

Exhibit C ii—16.5 
In every 1,000 Births there are the following numbers of Twin Births 
Of all mothers 
Of women who have had I multiple birth 
?> •; 2 ,, ,, 
,, „ 3 or more ,, 
Mortality of Twins. 
Percentage of deaths before the age of 20 : 
Figure C 11 (continued). 
Figure C 12 the celebrated pedigree of the Hsemophilic family C 12 
(bleeders) Mam pel (by Riidin after Lossen). 
Figure C 13 showing the inheritance of progressive muscular C 13 
atrophy (after Eichhorst). 
Figure C 14 a partial reproduction of a pedigree comprising over c 14 
2,000 people of the family Nongaret suffering from inherited 
stationary night blindness (compiled by Cunie^r, True and 
Nettleship). With regard to these figures it is to be noted that only 
a fraction of the offspring is affected with the illness, the remainder 
being perfectly normal. It is remarkable with the bleeders 
(Hsemophilic persons) that the females do not suffer from the disease 
though they transfer it to their male offspring; a similar latent 
disposition is observable in other hereditary conditions, especially 
colour-blindness. W. Weinberg shows in Table C 15 the frequency of tuberculosis C J5 
within families. He adds : “ This is a comparison of the 
experiences of married tubercular individuals, regarding the frequency 
of tuberculosis among their parents, brothers and sisters, with the 
corresponding experiences of their husbands or wives who come on an 
average from similar surroundings. The experiences of the latter 
represent the normal expectation. It is especially striking that the family 
influence tells most with the children of the well-to-do.” The well- 
known fact that the tuberculous frequently come from tuberculous 
stock is clearly demonstrated in the figures of this table. 
In Table C 16 Dr. Otto Diem shows the distribution of particular C 16 
taints in every hundred of the tainted members among the nearest 
relations (parents, grandparents, uncles, aunts, brothers and sisters)

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