A sermon preached in the cathedral church of St. Paul before the Right Honourable the Lord Mayor, the Aldermen, Sheriffs, the Common Council of the City of London, the City Officers, and the Honourable the Artillery Company, on Wednesday, the Ninth of March, 1796, being the day appointed by His Majesty, To be observed as a General Fast. By the Revd. Thomas Roberts, A. M. Chaplain to his Lordship