Mr. Kett says: "Rubens's method of painting was his own. Some of his fellow-countrymen, who were jealous of him, said he did not use paints, but colored varnishes, and that his pictures would not last; of the latter point we are the better judges. He used light grounds, almost, if not quite white; his outlines were drawn with a brush in color (often red for the flesh), and very transparent glazes were laid over all the shadows, the lights being sometimes, not always, painted thicker. He exposed his pictures to the sun for short spaces of time, between the paintings, to dry out the oil. They received several coats of color, and then, finally, he put in the stronger touches himself, the light ones now thick. All his works, however, do not seem to have been done in this way, but many have solid painting from the first." Rubens had become both rich and famous. When an alchemist visited him, urging that he furnish a laboratory and apparatus for the process of transmutation of metals, and share the profits, the painter replied: "You have come twenty years too late; I found out the secret long ago;" and then, pointing to his palette and brushes, he added, "Everything I touch with these turns to gold." A new honor was now conferred upon Rubens. Marie de' Medici, the sister of the Duchess Leonora of Mantua, wished to adorn her palace of the Luxembourg, in Paris, with great magnificence. Henry, Baron Vicq, the ambassador of the Archduke Albert and Isabella, spoke to Queen Marie of Rubens. She must have known of his work, also, when he was the court painter of Mantua. He was summoned to Paris, and took the order for twenty-two immense pictures, illustrative of her life. These are now in the Louvre, full of vigor, brilliant in imagery, and rich in color.