Abstract :
In the mid-19th century, British doctor John Snow went against popular theory (the miasma theory, as it was called) when he deduced a connection between a London cholera epidemic and contaminated water. Snow had gone door to door mapping the outbreak until he finally narrowed the source to a well pump on London?s Broad Street. The handle was removed from the well pump, and today, if not then, that action is credited by some as ending the epidemic.
