This section of the Hugh Pattison Macmillan papers is concerned with the campaign to create a National Library of Scotland on the basis of the Library of the Faculty of Advocates, 1913-1924; the Scottish National Library Endowment Trust, and Sir Alexander Grant's benefaction, 1923; the drafting and passage of the National Library of Scotland Act, 1925; and the business and administration of the two libraries, 1914-1937.