Note 13 — PREFATORY NOTE.
Reading edition
Virgil of Salzburg. See Neander's History of the Christian Church, Torrey's translation, vol. iii., p. 63. Since Bayle, there has been much loose writing about Virgil's case. See Whewell, p. 197; but for best choice of authorities and most careful winnowing out of conclusions, see De Morgan, pp. 24-26. For very full notes as to pagan and Christian advocates of doctrine of rotundity of the earth and of antipodes, and for extract from Zachary's letter, see Migne, Patrologia, vol. vi., p. 426, and vol. xli., p. 487. For Peter of Abano, or Apono, as he is often called, see Tiraboschi; also, Ginguené, vol. ii., p. 293; also Naudé, Histoire des Grands hommes accusés de Magie. For Cecco d'Ascoli, see Montucla, Histoire des Mathématiques, i., 528; also, Daunou, Études Historiques, vol. vi., p. 320. Concerning Orcagna's representation of Cecco in flames of hell, see Renan, Averroès et l'Averroisme, Paris, 1867, p. 328.