Tracts, on inoculation, written and published at St. Petersburg in the year 1768, by command of her imperial Majesty, the empress of all the Russias : With additional observations on epidemic small-pox, on the nature of that disease, and on the different success of the various mosdes of inoculation. By the Hon. Baron T. Dimsdale, physician and acutal counsellor of state to her imperial Majesty, the empress of all Russias, and F.R.S.