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The Registrar-General states that the mortality of districts
did not increase as the density of their population, but as the
square root of the density. When this calculation is applied to the
various groups, it will will be seen that in group No. 1, in which
there are 147 square yards to each person, the mortality is less
than the calculated number; that in group 2, with 139 square
yards to each inhabitant, the actual and calculated mortality
agree; that in group 3, with 97 square yards to a person, the
actual mortality is in excess; but in groups 4 and 5, with a
death-rate of 24*90 and 2S-08 and a space of 46 and 28 yards
respectively to each individual, the calculated mortality agrees
so closely with the observed as to be practically identical. They
are nearly the same for Liverpool, but differ for Manchester.
As regards children under 5 years the increase of mortality is
most marked, as the following conclusively show:—
No. of Group 1 2 3 4 5 6 7
Mortality under 38 48 63 82 95 112 140
5 years
This brief Table points out that whenever there are less
than 147 square yards on an average to each person, the mortality,
amongst children will — other things being equal — increase
rapidly, that the density and mortality both increase together,