A letter from a country gentleman, to a member of Parliament, on the present state of public affairs : In which the object of the contending parties, and the following characters are particularly considered; the Dukes of Norfolk, Portland, and Northumberland; the Houses of Devonshire, and Russel; the Lords Thurlow, Loughborough, and North; Mr. Pitt,-Mr. Fox,-Mr. Burke,-Mr. Sheridan; Mrs. Fitzherbert, and His Royal Highness the Prince of Wales.