[47] Milman: VIII, p. 228-9. See the Paradiso.

[48] Isidore of Seville: De Ordine Creaturarum, c. 5, sec. 3, (v. 83, p. 923).

[49] Lombard: Sententia, Bk. II, Dist. I, sec. 8, (v. 192, p. 655).

[50] Aquinas: Summa Theologica, pt. I, qu. 70, art. 2. (Op. Om. Caietani, V, 179).

[51] Roger Bacon: Opus Tertium, 295, 30-31.

[52] Ibid: 289.

[53] Ibid: 282.

[54] Delambre: Moyen Age, 365.

[55] Prowe: II, 67-70.

[56] Delambre: Moyen Age, 262-272.