Assertion: slum's population | /r/HasProperty | 9 million
Facets:
value: by comparison
type: OTHER
value: in 1801
type: TEMPORAL
Source sentences:
text: By comparison, in 1801 the population of England and Wales was 9 million; by 1851 it had more than doubled to 18 million, and by the end of the century had reached 40 million.