Entitled: "Alchemical scene showing two putti holding philosopher's stone containing image of Hermes, below which are a man and a woman kneeling before furnace where transmutation is to take place." Illustration appeared in Mutus Liber (from Latin: Silent Book) an alchemical text published in France in the later half of the 17th century. It professed to outline, through a series of mystical illustrations, a method of manufacturing the Philosopher's Stone. It was first printed in 1677. Its authorship, long obscured by abstruse claims and speculation, has ultimately been attributed to Isaac Baulot, an apothecary and savant of matters medicinal at La Rochelle, born there in 1612. Scrolls on the last plate of the Mutus Liber bear in Latin the dismissal oculatus abis, "thou departest seeing," which almost anagrams the author's name. A hand-colored pressing of 1702, probably unique, is in the Library of Congress.