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detail in the London life table appended to the annual report for 1901. It will be seen from the
description therein contained that in order to apply this method of comparison it is necessary in the
first place to ascertain from the life table the mean future life time of males and females in groups of ages
corresponding to those age-groups to which the deaths relate. The following table shows the results
thus obtained from the London life table, 1891-1900—

In the following table the number of deaths occurring in the year 1904 at each age-period and
for each sex is compared with the number of deaths which would have occurred had the death-rates of
the period 1891-1900 been maintained in the year 1904. The number of lives gained in the latter period
is also shown, and the figures in the last column of the table express this gain in terms of "life capital,"
these being obtained by applying the mean future lifetime figures given in Table I. to the number of
lives gained at each age-group.

It will be seen from the preceding table that during the year 1904, compared with the decennium
1891-1900, there has been a saving of 14,356 lives, representing a gain to the community of 540,448
years of life capital.