The Nuttall Encyclopedia
A body of Presbyterians in Scotland who dissent from the Established Church on chiefly ecclesiastical grounds, and had their origin in union in 1847 of the Secession Church of 1733 with the Relief Church of 1752, bodies previously in dissent as well. A further union of the United Presbyterian body with the Free Church is to all appearance about to be consummated.
Wood, James, ed. Entry for 'United Presbyterians'. The Nuttall Encyclopedia. https://www.studylight.org/encyclopedias/eng/nut/u/united-presbyterians.html. Frederick Warne & Co Ltd. London. 1900.