Observations medical and political, [electronic resource] : on the small-pox, and the advantages and disadvantages of general inoculation, especially in cities: and on the mortality of mankind at every age in city and country; With a Comparative View and regular Tables of all the fatal Diseases and Casualties in London, during the last One Hundred and Five Years, by which about Two Millions and a Half of the Human Species have been exterminated: Including an Attempt to demonstrate, in what Manner London may save Two Thousand, Great-Britain and Ireland between Taventy and Thirty Thousand, and Europe about Three Hundred and Ninety Thousand Lives Annually. To which is added a Postscript, Containing the Sketch of an easy Plan for new modelling and essentially improving the London Bills of Births and Mortality. By W. Black, M. D.