Cow Poxed, Ox Faced Boy - illustration to "Cow-Pox Inoculation No Security Against Small-Pox Infection" by W. Rowley.

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Cow Poxed, Ox Faced Boy - illustration to "Cow-Pox Inoculation No Security Against Small-Pox Infection" by W. Rowley. Wellcome Collection. Public Domain Mark. Source: Wellcome Collection.