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11
From Tables VII. and VIII. it appears that the birthrate
of the Parish was only 17.04, and that of the Mayfair
Sub-District was 10.98, as against 9.17 in 1896, while that
of the Belgravia Sub-District was 19.60, as against 20.30 in
1896; and that the corrected death-rate of the Mayfair
Sub-District was 9.38, as against 7.93 in 1896, and that of
the Belgravia Sub-District was only 14.78, as against 16.20
in 1896.
From the birth and death rates in Table VII. 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 Annual Report for 1890), 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" stated in this report is calculated by means
of Dr. Bristowe's formula.
The birth-rate in the Mayfair Sub-District is so abnormally
low, and the death-rate at the same time so low, that
it is of no use attempting to get any correct approximation
of the mean length of life in that Sub-District. I therefore
merely give it for the whole Parish, for which I calculate
it was 66.69 years.