Edwin Chadwick,
On an annual census
(1889)
“ There has, therefore, been a gain by sanitation, to all who have been born and lived here since 1847, of seven years. Now referring to the accustomed death-rates as to which I have been challenged. The common death-rate accepted all over Europe at present is the rate per thousand of the population. From what has been shown as to the changes of population in the most crowded districts, it will be seen how defective that must be. It is like taking the mean age of death of the fixed population of a regiment, one fourth or third of which is changed. ”
