Note 20 — IV

A book printed at Delft in 1480, says that when St. Gregory was pope, he celebrated mass in the church Porta Crucis. As he was consecrating the bread and wine, Christ appeared to him as represented in the engraving, with all the accessories to his passion. Robert of Cologne, who wrote a treatise on indulgences, published at Zutphen in 1518, adds, that Pope Gregory kindly granted 14,000 years of indulgence; that Pope Nicholas V doubled them; that Pope Calixtus, after requiring the repetition five times of the prayers, again doubled the years of indulgence; that Pope Innocent VIII, after adding seven more prayers, two other prayers, and two more of the Pater Noster and the Ave Maria, again doubled the length of indulgence—so that the sum total amounted to at least 70,000 years: according to other computations, to 92,000 years, or 112,000 years. Holtrop, Monuments typographiques, p. 13. There is but one copy of this print, which recently belonged to the collection of Theodor O. Weigel of Leipsic, who published a fac-simile of it in colors, in his great work, The Infancy of Printing, plate 113, vol. I.