Charles Booth's 'Descriptive Map of London Poverty'.

According to Charles Booth's survey in 1889, over a third of London's inhabitants lived on or below the margin of poverty. His 17-volume survey included this coloured-coded map indicating London's poverty and prosperity street by street. The key to the colours used is as follows:

Gold: Upper-middle and Upper classes.Wealthy.

Red: Well-to-do. Middle-class.

Pink: Fairly comfortable. Good ordinary earning.

Purple: Mixed. Some comfortable, others poor.

Pale Blue: Poor. 18s. to 21s. a week for moderate family.

Dark blue: Very poor, casual. Chronic want.

Black: Lowest class. Vicious, semi-criminal.