Raffaello, who much loved the genius of Giovanni, in executing the altar-picture of S. Cecilia that is in Bologna, caused him to paint the organ which that Saint has in her hand; and he counterfeited it so well from the reality, that it appears as if in relief, and also all the musical instruments that are at the feet of the Saint. But what was of much greater import was that he made his painting so similar to that of Raffaello, that the whole appears as if by one and the same hand. Not long afterwards, excavations being made at S. Pietro in Vincula, among the ruins and remains of the Palace of Titus, in the hope of finding figures, certain rooms were discovered, completely buried under the ground, which were full of little grotesques, small figures, and scenes, with other ornaments of stucco in low-relief. Whereupon, Giovanni going with Raffaello, who was taken to see them, they were struck with amazement, both the one and the other, at the freshness, beauty, and excellence of those works, for it appeared to them an extraordinary thing that they had been preserved for so long a time; but it was no great marvel, for they had not been open or exposed to the air, which is wont in time, through the changes of the seasons, to consume all things. These grotesques--which were called grotesques from their having been discovered in the underground grottoes--executed with so much design, with fantasies so varied and so bizarre, with their delicate ornaments of stucco divided by various fields of colour, and with their little scenes so pleasing and beautiful, entered so deeply into the heart and mind of Giovanni, that, having devoted himself to the study of them, he was not content to draw and copy them merely once or twice; and he succeeded in executing them with facility and grace, lacking nothing save a knowledge of the method of making the stucco on which the grotesques were wrought. Now many before him, as has been related, had exercised their wits on this, but had discovered nothing save the method of making the stucco, by means of fire, with gypsum, lime, colophony, wax, and pounded brick, and of overlaying it with gold; and they had not found the true method of making stucco similar to that which had been discovered in those ancient chambers and grottoes. But at that time works were being executed in lime and pozzolana, as was related in the Life of Bramante, for the arches and the tribune at the back in S. Pietro, all the ornaments of foliage, with the ovoli and other members, being cast in moulds of clay, and Giovanni, after considering that method of working with lime and pozzolana, began to try if he could succeed in making figures in low-relief; and so, pursuing his experiments, he contrived to make them as he desired in every part, save that the outer surface did not come out with the delicacy and finish that the ancient works possessed, nor yet so white. On which account he