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19
Owing to the changes which have occurred in the birth-rate since the middle of
last century and to the movement of population to outside the county boundary in
the course of years, the age-distribution of the London population has become more
and more abnormal, with the result that the cancer-rate calculated on the total
population divided into total deaths does not accurately represent the cancer
mortality.
The rates so calculated for 1930-32 were 1.67 per thousand for males and 1.53
for females. If the rates are calculated on the life-table population, in which the
disturbing factors referred to are, so far as practicable, eliminated, the rates become
2.22 for males and 2.11 for females ; the similar figures for 1920-22 worked on the
life-table for that period are 1.93 for males and 1.97 for females. On the basis of
these corrected figures the intercensal increase in the cancer rate for males, namely
.29, was twice as great as that among females, .14.

Tuberculosis.
The deaths from pulmonary tuberculosis in London during 1933 numbered
3,530, giving a death-rate of 082 per thousand living, the corresponding
figures for 1932 being 3,564 and 0 82 respectively, and 3,907 and 0 88 for 1931.
There were 466 deaths from other forms of tuberculosis in 1933 as against
522 in 1932 and 552 in 1931, the death-rates being 0.11, 0.12 and 0.13,
respectively.

Tuberculosis.