‘Sesquicentenary Exhibition’. File contains papers concerning an exhibition illustrating the history of the Society from its foundation arranged by staff of the Scientific Periodicals Library in Room H on the first floor of the Arts School, held 27 October to 29 November 1969. File includes: draft of ideas for the exhibition; and catalogue of items exhibited in 13 showcases and other items (which included the Society's ballot box (see CPS 16/1), other artefacts, and framed portraits and mounted photographs).