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624   Life and Letters of Francis Galton

1 in 20 families of 4 each, or 1 in 5 [? 20] children

in population of 1000, 20 marriages per annum, children of one selected is 4 children at 4s. a week = 208s. a year =£10. 8s. say roughly £10 for 5 per cent, of child population for "10 years.

Total of £10 per child for 15 years= X150; per 4 children £600 max.,

3   £450 max.,

insurance might repay (in   what part leaves max. £300) or £300 annually to be extracted for each 1000 of population,

£3 out of 10 = 66s. = £3. 3s. per head.

14 million for 45 say £1 to every 3 persons= about £3 per head. 15

Selection.

1 in 20 families   parent engineer . family large,

total 6 in each family of whom 1 dies not counted owing to early death. 5 to be allowed for.

4s. a week for 52 weeks=£10. 8s. a year say £10 to be continued for 15 years =£150 each child

=£750 for each family of 5 children.

Marriages in a population of 1000 = say 20 or 1 in 50 of which one produces the 5 children. Therefore the annual cost per head per thousand of population of 1000 would be £O-75 or 15s. per head of total population.

14 millions (and more could be had) so say 15 millions are expended annually in voluntary charities= £ 1 to each 3 persons= 7s. a head about or half the above. What would be the money worth to the nation of each person selected at rate of 1 in 7?