The collection is composed of reports, memoranda, addresses, and speeches, including those from or to: the Church of Scotland, the United Free Church of Scotland, and the Christian Unity Association of Scotland, and on various subjects: annual reports, proposed pension fund for Ministers, report of church committees, spiritual calling, parish church interests, and church union. There are also letters between Bruce and various correspondents, such as: Rev. James Montgomery Campbell, 1912, Rev. Prof. James Cooper, 1912, Rev. Dr. Archibald Fleming, 1905 and 1912, Rev. Dr. Archibald Henderson, 1913, Christopher N. Johnston K.C., 1912, and the Rev. A. W. Wotherspoon, 1912. There are letters attached to a report of the Church of Scotland Committee on Church interests, 1912, and a letter from Scots churchmen, 1913. The collection also includes letters to Bruce from The Scotsman office, 1912, and a letter from Rev. James S. Stewart, 1905, with material relating to North United Free Church, Aberdeen. Finally there are drafts of speeches and miscellaneous notes, 1912-1913.