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for 1905, corrected by the factor given in the preceding table (a factor which is based on the age and
sex constitution of the mean population of England and Wales in the decennium 1891-1900) works out
at 15.85 per 1,000 living, while the application of the London death-rates in 1905 at the several ageperiods
to the mean population of England and Wales 1891-1900 (taken as a standard population) gives
a death-rate of 15.87 per 1,000 living, a difference of 0.02 or 0.13 per cent. Judging by the amount
of deviation from unity of the several "correction factors" shown in the table, it will be seen that the
most abnormal population among the sanitary areas from the point of view of its age and sex
constitution is that of Hampstead, the "correction factor" for which is 1.1280. I have, therefore,
worked out the corrected death-rate for 1905 for this district by the two methods referred to, the results
giving death-rates of 10.54 and 10.40 respectively, a difference of 0.14 or 1.3 per cent. This percentage
may be taken to represent the maximum amount of error so far as the London boroughs are concerned,
introduced by the use of the "factor" method in preference to the more accurate method of applying
the death-rates at each age to a standard population.

London mortality in 1905 compared with the mortality in the decennium 1891-1900.
The following table shows the mean death-rates obtaining in London at the several age-periods
and for each sex in the decennium 1891-1900 and in the year 1905. The figures for the year 1905 are fully
corrected for institution deaths (see footnote page 9), and the rates for the decennium 1891-1900
are based upon figures which have been corrected for institution deaths on the basis of the experience
of the four years 1897-1900; a fuller discussion of this point will be found in the London Life Table
appended to my report for the year 1901.
Age-period.
Males.
Females.
Mean deathrate
1891-1900.
Death-rate
1905.
Difference per
cent.
Mean deathrate
1891-1900.
Death-rate
1905.
Difference per
cent.
0– 71.97 51.63 –28.3 61.99 43.50 –29.8
5– 4.97 3.19 –35.8 5.17 –38.1
10– 2.46 1.97 –19.9 2.48 189 –23.8
15– 3.47 2.67 –23.1 2.94 2.16 –26.5
20– 4.59 3.65 –20.5 3.46 2.64 –23.7
25– 7.36 5.57 –24.3 5.65 4.08 –27.8
35– 14.22 10.45 –26.5 10.68 7.78 –27.2
45– 23.14 19.20 –17.0 17 .12 13. –18.4
55– 40.68 35.55 –12.6 31.01 –15.1
65– 77.78 71.16 – 8.5 63.44 56.27 –11.3
75– 154.13 138.31 –10.3 134.56 119.99 –10.8
85 and upwards 284.10 315.18 +10.9 265.77 288.99 + 8.7
All aees .. 20.88 16.36 –21.6 17.88 13.85 –22.5
11476
1. See footnote ('), p. 9.
b 2