[66] See Ernest Wickersheimer, ‘Figures médico-astrologiques des neuvième, dixième et onzième siècles’, in the _Transactions of the Seventeenth International Congress of Medicine, Section XXIII, History of Medicine_, p. 313, London, 1913. [67] Migne, cols. 403-14. [68] Migne, col. 751. [69] Migne, col. 791. [70] The _Quaestio de Aqua et Terra_ is doubtless a genuine, albeit the least pleasing, production of the great poet. The genuineness is established by Vincenzo Balgi in his edition, Modena, 1907. [71] Migne, col. 741. [72] Migne, col. 743. [73] It is outside our purpose to attempt a full elucidation of Hildegard’s allegory. The eagle in the right wing signifies the power of divine grace, while the human head in the left wing indicates the powers of the natural man. To the bosom of the figure is clasped the Lamb of God. [74] Migne, col. 751. [75] Migne, col. 744. [76] _Liber Divinorum Operum_, part i, visions 2 and 3. [77] Migne, cols. 752-5. [78] Migne, col. 807. [79] The work is printed by C. S. Barach and J. Wrobel, Innsbruck, 1876. The writers, however, confuse Bernard Sylvestris of Tours with his somewhat older contemporary, Bernard of Chartres. [80] A. Clerval, _Les Écoles de Chartres au Moyen Âge_, Paris, 1895. [81] J. E. Sandys, _History of Classical Scholarship_, Cambridge, 1903, vol. i, p. 515. [82] R. Lane Poole, _Illustrations of the History of Mediaeval Thought in the Departments of Theology and Ecclesiastical Politics_, Oxford, 1884, pp. 118, 219. [83] Barach and Wrobel, _loc. cit._, pp. 5-6, 9 and 13. [84] For a general consideration of these figures see K. Sudhoff, _Archiv für Geschichte der Medizin_, i. 157, 219; ii. 84. [85] E. Wickersheimer, ‘Figures médico-astrologiques des neuvième, dixième et onzième siècles’, _Transactions of the Seventeenth International Congress of Medicine, Section XXIII, History of Medicine_, p. 313, London, 1913. [86] The MS. from which Plate XV is taken _(Paris, Bibl. nat., Latin_ 7028) is entitled _Scholium de duodecim zodiaci signis et de ventis_. It was once the property of St. Hilaire the Great of Poitiers. The legend above our figure reads, ‘Secundum philosophorum deliramenta notantur duodecim signa ita ab ariete incipiamus’. The relation of the signs to the parts of the body is different in this eleventh-century MS. from that which was widely accepted in the astrology of the thirteenth and fourteenth centuries as illustrated in Plate XVI.