This Companion Website for Composing the World: Harmony in the Medieval Platonic Cosmos provides downloadable translations of the Latin texts edited in the Appendices: (1) an excerpt from William of Conches’s Commentary on the “Greater Priscian” (Paris, Bibliothèque nationale, lat. 15130, 3va5ra) and (2) three excerpts from Hisdosus’s On the Platonic World Soul (Paris, Bibliothèque nationale, lat. 8624, 17r22v). Both translations are minimally annotated, with notes providing sources for direct quotations and references. For all text-critical notes and a fuller account of the sources and parallels, please refer to the Appendices.