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

Licence: Public Domain Mark

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