Two Extracts from the Sixth Book of the General History of Polybius. I. The Origin, and Natural Revolutions, of Civil Government. An Analysis of the Government of Rome. II. Some Peculiar Excellencies in the Roman Government and Manners, Illustrated by a Comparison of Them with Those of Other States. Translated from the Greek. To which are Prefixed Some Reflections Tending to Illustrate the Doctrine of the Author Concerning the Natural Destruction of Mixed Governments, with an Application of it to the State of Britain. By Mr. Hampton