"I arrived at the conclusion in the latter part of 1848, that cholera is communicated by the evacuations from the alimentary canal." --John Snow, On the Mode of Communication of Cholera, 1848 On the Mode of Communication of Cholera--Second Edition, Much Enlarged (1854) is the follow-up to an earlier short essay (also available from Cosimo Classics) by English physician John Snow, in which he stated his theory that diseases such as...