The contents are as follows. (i) Letters from prominent Scots, chiefly sponsors of Hugh Pattison Macmillan's public memorial, "A National Library for Scotland: Proposal to Establish a Scottish National Library on the Basis of the Advocates' Library", (folio 1); (ii) Correspondence and papers, 1922-1925, 1934, concerning the Scottish National Library Endowment Trust established on the basis of the Proposal. Correspondents include: James Avon Clyde, Lord Clyde; Sir John Lamb and Lord Novar (Scottish Office); Sir John Stirling Maxwell; Sir Robert S Rait; and K M Oliphant Writer to the Signet, Trust Treasurer (folio 25); (iii) Correspondence, 1922-1923 with John Ross and J M Mitchell of the Carnegie United Kingdom Trust on possible aid to the National Library Trust (folio 113).