Bifolium in Carolingian minuscule, containing a fragment of De institutione musica by Boethius (Liber I, chap. 23-14 and Liber II, chap. 8). It is part of the same manuscript as the fragments R 1.5.7, R 1.1.9, R 1.1.10 and R 1.1.11 from the state archives of Solothurn. This bifolium was used as binding for the Liber Cellae sub littera AA, with accounts from 1520 from the collegiate church of St. Leodegar in Schönenwerd.
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Solothurn, Staatsarchiv, R 1.5.8, 2 – Boethius, De institutione musica (Liber I, cap. 23-24; Liber II, cap. 8)https://fragmentarium.ms/view/page/F-emge/1554/19601