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CONTENTS.
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Night Population of the City since 1801 8
Ditto ditto in 1871 8
Day Population of the City in 1871 9
Density of the City Population 9
Estimated Population of the City 11
Number of Births, Deaths, and Marriages in each of the City
Districts 11
Marriages per 1,000 of the Population 13
Births ditto ditto 13
Deaths ditto ditto 14
Fallacy of the Death-rate as a Measure of Salubrity 15
Classification of Deaths according to Age 16
Causes of Death 16
Mortality from Small-pox in 1871 Compared with Former Years 17
Biennial periodicity of Small-pox 18
Proportion of "Vaccinated to Un-vaccinated 19
Necessity for Primary and Secondary Vaccination 20
Mortality per cent. from Small-pox at different Ages among
Vaccinated and Un-vaccinated 21
Prophylactic Powers of Primary Vaccination 22
Absolute Immunity from the Diseases after Secondary
Vaccination 23
Large average Mortality from the Disease during the Present
Epidemic 25
Comparison of the Present with Former Epidemics of the
Disease 26
Rise and Progress of the Present Epidemic 27
Complementary Proportions and Average Quantivalance of
Zymotic Diseases 29
Attempts to Correlate them 30
Sickness Returns in the City 32
Meteorology of the Year 32
Quality of the "Water Supply of London 33
Occsional Turbidity, and Nature Thereof 35