The Royal College of Surgeons, 1806.

In reply to a circular letter addressed to more than eleven hundred of its members, asking their experience of the protective powers of vaccination, the Board received 426 answers, and the information obtained was that there had been 56 cases of small-pox after vaccination, 3 deaths, 66 cases of eruptions, and 24 bad arms.—See Pamphlet by John Birch, Surgeon to St. Thomas's Hospital. London, 1807.