On the effects of Migrations in disturbing Local Rates of Mortality, as exemplified in the Statistics of London and the surrounding country, for the Years 1851–1860

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Abstract
I propose in this paper to deal with a question which has an important bearing upon those calculations as to deathrates, which are now so widely circulated and so generally felt to possess interest. It has occurred to the Registrar-General, and, as I believe, to other inquirers, to remark that the mortality happening in London is diminished, “because domestic servants, shopwomen and milliners, “who have come from the country, retire when health fails them “to their native air.”