'Science' in the Social Sciences

4. Causal Reasoning

Figure 1

Description: John Snow’s map showing cholera deaths in London in 1854. The Broad Street well is marked with an x (within a blue circle).

The user can select three functions; play, pause, play again.

When the user selects the play button, a large blue circle appears on the map, as well as red dots representing cholera deaths and green x’s representing wells. The animated blue circle decreases in size and circles the green x that represents the Broad Street well that was discovered to be pumping cholera contaminated water. This interactive figure illustrates how most of the cholera deaths were concentrated around the Broad Street well which was discovered to be the source of the cholera epidemic by John Snow.