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9
From Tables IV. and IVa it appears that the birth-rate
of the Mayfair Sub-District was only 8.95, as against 995
in 1890, while that of the Belgravia Sub-District was
22.59, as against 21.34 in 1890, and that the corrected
death-rate of the Mayfair Sub-District was 10.08, as against
9.32 in 1890, and that of the Belgravia Sub-District was
17.00, as against 17.24 in 1890.
From the birth and death-rates in Table IVa I have calculated,
as usual, "the mean length of life." I use the
term "mean length of life" instead of "mean duration of
life" (as I explained in my last Annual Report) in order to
prevent confusion, as the term "mean duration of life" is a
technical expression, which means the length of life as
calculated by the life-table method. The "mean length of
life" state 1 in this report is calculated by means of Dr.
Bristowe's formula.

The extraordinary figure calculated for the Mayfair SubDistrict
is due to the abnormally low birth rate (8.95) and
this is caused partly by the fact that there are a very large
number of unmarried domestic servants, and partly because
so many of the children of the inhabitants are born in the
country.