The contents are as follows: (i) Letters and documents, [?1643]-1736, undated, numbered E.1-54 (with gaps). There is a considerable overlap in content with MS.20772. For more of this series of letters and documents, see MS.20800 (i). The basis of the arrangement is chronology but the reasons for selection are not clear. (Folio 1.) This is XVII C in the ‘Inventory’ (MS.20770).

(ii) Letters, 1719-1733, to the Earl of Wigtown from other Scottish peers, chiefly in 1721 and 1727, concerning the Peerage Bill and the election of the Representative Peers. (Folio 93.) This is XI B in the ‘Inventory’ (MS.20770).