Letter from the Duke of Atholl to Lord Mansfield (Lord Chief Justice) seeking legal and political advice on the proposed sale of the Isle of Man to the Crown. The Duke outlines his valuation of the island based on actual revenues (£7,322 per annum average over six years), potential for customs duty increases, ecclesiastical and civil appointments, and development opportunities. He references previous correspondence from the late Duke (1759) and expresses reluctance to sell immediately.