understand how greatly the retouching of works in fresco with other colours, after they are dry, causes injury to their pictures and labours, as it has been said in the treatise on Theory; for it is a very certain fact that they are aged, and not allowed to be purified by time, by being covered with colours that have a different body, being tempered with gums, with tragacanths, with eggs, with size, or some other similar substance, which tarnishes what is below, and does not allow the course of time and the air to purify that which has been truly wrought in fresco on the soft plaster, as they would have done if other colours had not been superimposed on the dry. [Footnote 1: _I.e._, Emperor.] Having finished this work, which, being truly worthy of all praise, brought him honourable payment from the Pisans, who loved him greatly ever afterwards, Antonio returned to Florence, where, at Nuovoli without the Porta a Prato, he painted in a shrine, for Giovanni degli Agli, a Dead Christ, the story of the Magi with many figures, and a very beautiful Day of Judgment. Summoned, next, to the Certosa, he painted for the Acciaiuoli, who built that place, the panel of the high-altar, which was consumed by fire in our day by reason of the inadvertence of a sacristan of that monastery, who left the thurible full of fire hanging from the altar, wherefore the panel was burnt, and afterwards the altar was made by those monks, as it stands to-day, entirely of marble. In that same place, also, the same master made in fresco, over a wardrobe that is in the said chapel, a Transfiguration of Christ which is very beautiful. And because he studied the science of herbs in Dioscorides, being much inclined thereunto by nature, and delighting to understand the property and virtue of each one of them, at last he abandoned painting and gave himself to the distilling of simples and to seeking them out with all diligence. Changing thus from painter to physician, for a long time he followed this art. Finally, falling sick from disease of the stomach, or, as others say, from plague caught while acting as physician, he finished the course of his life at the age of seventy-four, in the year 1384, when there was a very great plague in Florence, having been no less expert as physician than he was diligent as painter; wherefore, having made infinite experiments in medicine by means of those who had availed themselves of him in their necessities, he left to the world a very good name for himself in both one and the other of these arts. Antonio drew very graciously with the pen, and so well in chiaroscuro, that some drawings by him which are in our book, wherein he made the little arch of S. Spirito, are the best of those times. A disciple of Antonio was Gherardo Starnina, the Florentine, who imitated him greatly; and Paolo Uccello, who was likewise his disciple, did him no small honour. The portrait of Antonio Viniziano, by his own hand, is in the Campo Santo in Pisa.