1. Crombie, A. C—Robert Grosseteste and the Origins oi Experimental Science 1100–1700 (Oxford, 1953). [Chapter IX, “Experimental Method and Theodoric of Freiberg’s Explanation of the Rainbow,” is the best account in English of the theory of Theodoric.]
2. Dietrich of Freiberg—See Theodoric of Freiberg.
3. Duns Scotus, Joannes—Opera omnia (new edition, 26 vols., Parisiis, 1891–95). [See vol. IV, pp. 200–208 on the rainbow.]
4. Faral, E.—Jean Buridan. Notes sur les manuscrits, les éditions et le contenu de ses ouvrages, Archives d’Histoire Doctrinale et Littéraire du Moyen Âge, XV (1946), 1–53. [See pp. 21–24 for Buridan’s Meteorologica.]
5. Gaétan de Thiene—Meteorologicorum … cum commentariis (Venetiis, 1491). [There is a microfilm copy at Columbia University. See Book III for the rainbow.]