Letters from Count Algarotti to Lord Harvey and the Marquis Scipio Maffei, Containing the State of the Trade, Marine, Revenues, and Forces of the Russian Empire: with the History of the Late War Between the Russians the Turks, and Observations on the Baltic and the Caspian Seas. To which is Added, a Dissertation on the Reigns of the Seven Kings of Rome, and a Dissertation on the Empire of the Incas ; by the Same Author. Translated from the Italian