FIGURE 6.1 A version of Dr. John Snow’s 1854 map of Soho, London, showing locations of cholera deaths and water pumps.(Source: Map 1. Published by C.F. Cheffins, Lith, Southhampton Buildings, London, England, 1854 in Snow, John. On the Mode of Communication of Cholera, 2nd Ed, John Churchill, New Burlington Street, London, England, 1855.)