Page:Lives of British Physicians.djvu/296

 2-74 BRITISH PHYSICIANS. We have supplied lymph to the army and navy, to the Colonies, and to various parts of the Continent of Europe, since our last account ; and our correspondence, which has become more extensive than ever, bears us out in assviming that there is no increase in the proportion of cases of small- pox after vaccination, which affords an answer to questions put to us repeatedly as to the gradual diminution and wear- ing out of the vaccine lymph by time ; for it does not appear to us to be weakened or deteriorated by transmission through any number of subjects in the course of any number of years.