of the time, were known the properties of the concave and convex lens. He also invented the magic lantern; that pretty plaything of modern days, which acquired for him a reputation that embittered his life. In a history of alchymy, the name of this great man cannot be omitted, although unlike many others of whom we shall have occasion to speak, he only made it secondary to other pursuits. The love of universal knowledge that filled his mind, would not allow him to neglect one branch of science, of which neither he nor the world could yet see the absurdity. He made ample amends for his time lost in this pursuit by his knowledge in physics and his acquaintance with astronomy. The telescope, burning-glasses, and gunpowder, are discoveries which may well carry his fame to the remotest time, and make the world blind to the one spot of folly—the diagnosis of the age in which he lived, and the circumstances by which he was surrounded. His treatise on the Admirable Power of Art and Nature in the Production of the Philosopher's Stone was translated into French by Girard de Tormes, and published at Lyons in 1557. His Mirror of Alchymy was also published in French in the same year, and in Paris in 1612, with some additions from the works of Raymond Lulli. A complete list of all the published treatises upon the subject may be seen in Lenglet du Fresnoy.
Pope John XXII.
This prelate is said to have been the friend and pupil of Arnold de Villeneuve, by whom he was instructed in all the secrets of alchymy. Tradition asserts of him, that he made great quantities of gold, and died as rich as Crœsus. He was born at Cahors, in the province of Guienne, in the year 1244. He was a very eloquent preacher, and soon reached high dignity in the Church. He wrote a work on the transmutation of metals, and had a famous laboratory at Avignon. He issued two bulls against the numerous pretenders to the art, who had sprung up in every part of Christendom; from which it might be inferred that he was himself free from the delusion. The alchymists claim him, however, as one of the most distinguished and successful professors of their art, and say that his bulls were not directed against the real adepts, but the false pretenders. They lay particular stress upon these words in his bull, "Spondent, quas non exhibent, divitias, pauperes alchymistæ." These, it is clear, they say, relate only to poor alchymists, and therefore false ones. He died in the year 1344, leaving in his coffers a sum of eighteen millions of florins. Popular belief alleged that he had made, and not amassed, this treasure; and alchymists complacently cite this as a proof that the philosopher's stone was not such a chimera as the incredulous pretended. They
