[2640] Theorica, III, 12.

[2641] Corpus Christi 154, late 13th century, pp. 356-74, ascribed to Augustine in both Titulus and Explicit.

[2642] S. Marco 179, 14th century, fols. 57-9, 83, Liber Ysaac de differentia spiritus et animae.

[2643] CU Gonville and Caius 109, 13th century, fols. 1-6v, “Avicenna de differencia spiritus et anime.”

[2644] So says Coxe, anent Corpus Christi 114, and Steinschneider (1905), p. 43.

[2645] Migne, PL 40, 779-832.

[2646] By Trithemius; but earlier so cited by Vincent of Beauvais (PL 40, 779-80). See also Exon. 23, 13th century, fol. 196v.

[2647] Migne, PL 40, 779-80.

[2648] Both passages were excerpted by Vincent of Beauvais, Speculum naturale, XXIX, 41.

[2649] De Renzi (1852-9) IV, 189; Petrocellus is very brief on the cells of the brain.