Note 22 — Front matter

The procedure for instance in 1881 might be:—Take the English population at each age in 1871 as already corrected, and introduce the numbers of births returned in 1876–80 and 1871–75 as the first two terms of the series, adding a reasonable allowance for non-registration. Deduct the deaths in 1871–80, duly apportioned under periods of birth. The gross number of either sex enumerated in 1881 being known, the net loss or gain by migrations can then be ascertained. Apportion this in somewhat similar proportions to those observed in 1851–60. The final results will exhibit approximately the distribution of population by ages in 1881.