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12
From Tables VII. and VIII. it appears that the birthrate
of the Parish was only 151)7, and that of the Mayfair
Sub-District was 8 72, as against 937 in 1899, while that
of the Belgravia Sub-District was 19 32, as against 1975 in
1899; and that the corrected death-rate of the Mayfair
Sub-District was 10'40, as against 8'85 in 1899, and that of
the Belgravia Sub-District was 15 85 as against 10 58 in
1899.
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 *67 32 years. This is the highest mean length of
life yet recorded in the Parish, being over 12 years more
than in 1899, when it was exceptionally low.

* This figure seems very high, and so it is, but even if correction for age
and sex distribution be made, and the death-rate taken as 15*53, the mean
length of life works out at no less than 63*87 years.