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John Snow overcame this scepticism by conducting an elegant epidemiological
study which he called "The Grand Experiment" Quote from John Snow -
“The experiment, too, was on the grandest scale. No fewer than three hundred
thousand people of both sexes, of every age and occupation, and of every rank
and station, from gentlefolks down to the very poor, were divided into two
groups without their choice, and, in most cases, without their knowledge; one
group being supplied with water containing the sewage of London, and, amongst
it, whatever might have come from the cholera patients, the other group having
water quite free from such impurity”
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