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The next observation is, that … there are far more burials than christenings. This is plain…. From this single observation it will follow that London should have decreased in its people, the contrary whereof we see by its daily increase…. It is therefore certain that London is supplied with people from out of the country, whereby not only to repair the over‐plus difference of burials above‐mentioned, but likewise to increase its inhabitants—John Graunt, Natural and Political Observations made upon the Bills of Mortality .
Tim Dyson (Sat,) studied this question.