Problem: What was the importance of the ghost map? Question Answer a. Using microscope-based investigations of water samples, Snow mapped out occurrences of microscopic organisms (now known to be bacteria) in the various water sources in the Greater London area. This map depicts his results. b. It mapped out all deaths due to cholera in the Broad Street area, and showed where they occurred in relation to different water sources (pumps) c. It plotted the number of cholera cases as a function of elevation, and showed that people in lower elevation areas were more likely to get sick from cholera than people living in higher elevations with fresher air d. It mapped areas of religious influence in London and showed no correlation between distance from the nearest church (and so the holy ghost) and probability of dying of cholera e. The ghost map ended up having very little importance and is an example of research the gained a great deal of publicity without showing anything of significance. Need Assignment Help?