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MORTALITY OF THE CITY OF LONDON. 9
aggregate City rate, either for ordinary times or
for a period of epidemic disease (vide table 2,) is
compounded from the joint result of several very
different proportions. Reference to the RegistrarGeneral's
tables will enable any one to see that the
ordinary rate of mortality for the West London
Union is a fourth higher than the rate for the City
of London Union, while the rate for the East London
Union bears a still higher proportion; and it
is out of these very different rates that an aggregate
rate is struck for the whole City, comprising
the three unions referred to. It will be obvious
that many parts of the City are much healthier
than this aggregate rate would signify, while others
are much unhealthier. In regard of last year, for
instance (vide table 1), the aggregate rate of mortality
was (as I have stated) 30 per thousand of
the general population of the City; but if this rate
be analysed by examination of the sub-district
mortality, it will be seen that in one sub-district
the rate of death stood nearly as low as 20, that in
another (of the same union) it rose to 36, and in a
third sub-district (of another union) to within a
small fraction of 40.
If it were possible to furnish you with statistics
derived from a still smaller sub-division of each
district, these points would be infinitely more
manifest. In some limited localities of the City,
you would probably find an approximation to the
average mortality of suburban districts; while