Modern Letters in French and English Divided Into Two Parts, Part I, Containing Fifty Letters, with Their Answers, on a Variety of Familiar Subjects, Equally Entertaining and Instructive. Part II, Includes Some Observations on Commercial Stile, with Models of Letters, Bills, Etc., Relative to the Mercantile Business, to which are Annexed Accurate Directions with Regard to the Proper Form of Writing to Superiors, Equals and Inferiors, the Whole Designed for the Instruction and Improvment of Such Young Gentlemen and Ladies as are Desirous of Acquiring the True Style and Exact Manner of French Epistolary Correspondence, by Mr. Porny ...