water. population living at
all ages.
1860 58.1 deg. 60.6 deg. 151
1862 59.0 62.0 189
1879 58.7 60.7 228
1877 61.2 63.3 347
1874 61.7 63.8 447
1878 63.7 64.1 576
1876 64.4 64.9 643
As may be seen, the deaths of infants under 1 year of age from diarrhoea
per 1,000,000 population was only 151; while the mean summer temperature
was only 58.1 deg. F. against 189 in 1862, when the mean temperature was
59.0 deg.. In 1879, when the mean temperature was 58.7 deg., the deaths from
diarrhoea rose to 228 per million, but a few days were unusually hot. In
1877 the mean temperature of the air was 61.2 deg., of the Thames water 63.3 deg.,
and the mortality of infants from diarrhoea 347 per million population. In
1874, when the mean temperature of the air was 61.7 deg., the mortality rose
to 447 per million; and in the hot summers of 1878 and 1876, when the mean
air temperatures were 64.1 deg. and 64.9 deg. respectively, the death-rates of
infants were 576 and 642 per million population. The relations, therefore,
between a high summer temperature and the mortality from diarrhoea in
infants are very intimate.
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