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10
VITAL AND MORTAL STATISTICS, 1903.
POPULATION.
The number of persons estimated to be living at the middle
of the year, is 99,824. This figure is an increase of 1,811 upon
the corresponding figure of last year; and as the natural increase
of the population during the year, or, in other words, the excess of
the number of births over the number of deaths is 1,385, it leaves
426 as the number showing the excess of immigrants over emigrants.
The estimated figure above-mentioned is the basis of the
various calculations in this Report, and corresponds with the
figure used by the Registrar-General in a similar manner, and it is
obtained, first of all, by calculating the population for the Borough
on the basis of an arithmetical rate of increase proportionate
to the actual increase revealed by the census enumeration in
1901 over and above that of 1891; this estimate is then raised
by means of a constant, obtained by dividing the population
of England and Wales for any particular year calculated by
geometrical increase, by the population calculated by arithmetical
increase, hence there is a slight difference between the estimate of
population as calculated in the ordinary way by geometrical
increase, as compared with the estimate used in this Report, but
this variation is explained by the special process of estimation
outlined above, which is the one now adopted by the Registrar
General.