sentences:  In 1786 he transferred management of his estates to his then eldest son, Basil William, The Lord Daer, who conducted his affairs with great success.Dunbar, 4th Earl of Selkirk, died in 1799, and was succeeded by his youngest son Thomas, his other sons having predeceased him, as the 5th Earl of Selkirk.In 1811, the heir or heirs of Thomas Lidderdale (1630-1687) having gone abroad, a Robert Lidderdale, given the St Mary’s Isle wadset clauses, attempted to exercise the right to call on Lord Selkirk, The 5th Earl, to accept the conditions of the wadset, and to deliver up the Estate.