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8
The deaths among infants under one year of age in age-groups from the causes
included in the above table are shown by sex and according to legitimacy in the following
table :-

Migration
1861-1931.
The Annual Report for 1935 (Vol. III, Part I, p. 8) contained some notes by
Mr. C. A. Gould, M.C., B.Sc., of my department, on migration occurring in the
county of London. Further observations on this subject contributed by Mr. Gould
are subjoined.
The movement previously estimated was the net or balance of migration by age-groups
consisting, in general, of two opposite streams which may mask one another where one is not
greatly in excess. Migration can, however, also be considered according to place of birth, and,
although it is not possible to separate these two movements by age-groups, this can, however,
be done for the whole population of each sex. In the following notes, migration of the London
male and female populations during the period 1861-1931, has been investigated in the two
groups (i) London-born (ii) born elsewhere. The movements of these two groups were estimated
from the census populations at the beginning and end of each period and the total births and
deaths during the period, apportioning the latter among the two groups according to their mean
populations over the period, i.e., assuming a common death-rate. The result is set out in the
following table for each intercensal period between 1861-1931 and is most interesting.