An essay on the powers and mechanism of nature; intended, by a deeper analysis of physical principles, to extend, improve, and more firmly establish, the grand superstructure of the Newtonian system. By Robert Young - Young, Robert social reformer (printed for the author, by Fry and Couchman, near Upper-Moorfields; sold by T. Becket, Pall-Mall; J. Johnson, St. Paul's Church-Yard; and J. Murray, Fleet-Street, 1788)