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period of 184]-51, was 24.77; in the 10 years, 1851-61, it was
23.77, or 1.0 per 1000 population less than in 1841-51; in
1861-71 it was 24.43, and since 1871 the average has been 22.95,
so that although the density of population is much greater the
death-rate has diminished.
The columns in Table XIII, to which I now desire to call your
attention, are important, because they show the mortality from
zymotic diseases as far as possible in England and Wales and
London and Hackney. During the years 1841-51 the returns for
England are printed by the Registrar-General for six years only.
The average number of deaths in the years 1841-61 from scarlet
fever, small pox, measles, whooping cough, fevers, diarrhoea, and
other zymotic diseases was at the rate of 19.3 per 5000; in
1861-71 it was 20.8, and in 1871-75 only 18.4, being but little
above the average for 1841-51. In London the death-rate from
these diseases was higher than for all England, as it was 22.2
per 5000 in 1841-51; 22.7 per 5000 in 1851-61; 23.9 per 5000
in 1861-71, but in 1841-75 it was only 19.9. It is therefore
evident that the mortality from these diseases is as regular, when
taken together and for a sufficiently long period, as the mortality
from all causes. This will readily be seen by comparing the
means of deaths from all causes and from epidemics alongside of
one another, when the correspondence will be appreciated.

The mortality from these diseases was nearly as uniform in