Verrochio was engaged in painting a picture of St. John baptizing Christ, for the monks of Vallombrosa, and requested Leonardo to paint an angel in the left-hand corner, holding some vestments. When the work was finished, and Verrochio looked upon Leonardo's angel, "a space of sunlight in the cold, labored old picture," as W. H. Pater says, in his "Studies in the History of the Renaissance," Verrochio became so discouraged "because a mere child could do more than himself," that he would never touch the brush again. This work is now in the Academy of Fine Arts in Florence. About this time, according to Vasari, Leonardo made his famous shield _Rotella del Fico_. "Ser Piero da Vinci, being at his country house, was there visited by one of the peasants on his estate, who, having cut down a fig-tree on his farm, had made a shield from part of it with his own hands, and then brought it to Ser Piero, begging that he would be pleased to cause the same to be painted for him in Florence. This the latter very willingly promised to do, the countryman having great skill in taking birds and in fishing, and being often very serviceable to Ser Piero in such matters. Having taken the shield with him to Florence, therefore, without saying anything to Leonardo as to whom it was for, he desired the latter to paint something upon it. "Accordingly, he one day took it in hand, but, finding it crooked, coarse, and badly made, he straightened it at the fire, and, giving it to a turner, it was brought back to him smooth and delicately rounded, instead of the rude and shapeless form in which he had received it. He then covered it with gypsum, and, having prepared it to his liking, he began to consider what he could paint upon it that might best and most effectually terrify whomsoever might approach it, producing the same effect with that formerly attributed to the head of Medusa. For this purpose, therefore, Leonardo carried to one of his rooms, into which no one but himself ever entered, a number of lizards, hedgehogs, newts, serpents, dragon-flies, locusts, bats, glow-worms, and every sort of strange animal of similar kind on which he could lay his hands; from this assemblage, variously adapted and joined together, he formed a hideous and appalling monster, breathing poison and flames, and surrounded by an atmosphere of fire; this he caused to issue from a dark and rifted rock, with poison reeking from the cavernous throat, flames darting from the eyes, and vapors rising from the nostrils in such sort that the result was indeed a most fearful and monstrous creature; at this he labored until the odors arising from all those dead animals filled the room with a mortal fetor, to which the zeal of Leonardo and the love which he bore to art rendered him insensible or indifferent.