Read it through once

“The ‘magic’ symbolized, is that of genuine poetry; but the magician, or ‘Mage’, is an historical person; and the special feat imputed to him was recorded of other magicians in the Middle Ages, if not of himself. ‘Johannes Teutonicus, a canon of Halberstadht in Germany, after he had performed a number of prestigious feats almost incredible, was transported by the Devil in the likeness of a black horse, and was both seen and heard upon one and the same Christmas day, to say mass in Halberstadht, in Mayntz, and in Cologne’ (‘Heywood’s Hierarchy’, Bk. IV., p. 253). The ‘prestigious feat’ of causing flowers to appear in winter, was a common one.” --Mrs. Sutherland Orr’s ‘Handbook to the works of Robert Browning’, p. 209.