|Contribution||Promoted the "hypothesis" that epidemic diseases are caused by minute organisms carried from person to person by air.|
|Notes||He attributed the concept to Henry Holland, adding that it was supported by new facts and analogies from Jakob Henle. Farr was then in the office of the Registrar-General of England, and this item in one of the official reports makes it clear that the germ theory, while not yet validated, was being considered seriously by some leaders of the medical profession. Norman cites a 1838 report.|
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