The corrected birth-rates thus obtained were as follows:
_Group_
I 31.56
II 25.82
III 25.63
IV 25.50
V 25.56
VI 20.45
"It will readily be seen that the effect of the correction has been to
reduce the difference between the two extreme groups by about one-third,
showing that to this extent it is due to the way in which they differ as
to the average age and number of the women who marry. Further, Groups
II, III, IV and V have all been brought to about the same level, with a
corrected birth-rate about halfway between the highest and the lowest.
This shows that there is no gradual decrease in fertility associated
with a gradually increasing grade of prosperity, but that three sharply
divided classes may be distinguished: a very poor class with a high
degree of fertility, to which about a quarter of the population of
London belong, a rich class with a low degree of fertility, and a class
intermediate in both respects."
"Eugenics is less directly concerned with this side of the question that
with the relative rate of increase of the different classes. This may be
found for the six groups in the usual way by deducting the death-rate
from the birth-rate.
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