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The diagram shows the increase of the family in each generation within the
investigated district. In generation V are already found 888 individuals, which
is evidence of an unusual vita*
DIAGRAM
INCREASE OF THE FAMILY IN EACH GENERATION.
lity. Generations VI and VII
are, as we find, much fewer in
number, amongst other things
because they are not yet com*
piete. Future investigations of
the family, if such ever take place,
will show if any of these gene*
rations become so numerous as
the fifth was. It is possible,
that this will not be the case,
because the family is now poorer
than formerly, and much dete*
riorated, circumstances which in
no small degree tend to disperse
the same, that is to say, cause
removal, and emigration. Farmers
who must leave their old home*
steads, have generally no desire to remain in their native district.
In addition to this, nativity in many places in this district has decreased.
In all probability other more robust families settie down, and perhaps are
in their turn supplanted later on. We know very little of this social*biologic
process: development of families, their life, struggles, and ultimate decline. It is
like an unknown country, which must be explored.
We now pass on to investigate more closely the pathological conditions of
the family, by aid of tables 3 and 4 which give an essential idea thereof. We
find (table 3) that amongst 1,909 progeny, not less than 394 (= 20.6 %) were
defective, in soine way, 150 (= 7.9 %) of these were very defective. Amongst
TABLE 3.
THE DIVISION OF THE MATERIAL INTO DIFFERENT GENERATIONS.
Generation Number of households Number of children Average number of children in each family Died before the fifth year Healthy over •15 years Defects Defective persons Very defective persons
Number % Number Percentage of survivors over 5 years old Number % h J8 E 3 z % Number %
i i 6 - 4 . 2 _ 2 _ ’
ii 6 54 9.0 16 29.6 21 55.3 13 24.1 11 20.4 — —
in 24 140 5.8 36 25.7 58 55.8 51 36.4 40 28.6 14 10.0
IV 69 462 6.7 122 26.4 181 53.2 158 34.2 133 28.8 50 10.8
v 171 888 5.2 195 22.0 279 40.3 228 25.7 177 19.9 71 8.0
VI 102 354 3.5 59 16.7 60 20.3 52 14.7 31 8.8 15 4.2
VII 4 5 1.3
I -VII 377 1,909 5.1 428 22.4 603 40.7 504 26.5 394 20.6 150 7.9
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