"Flora," a beautiful woman in blue drapery, holding a flower in her left hand, believed by many to be a portrait of Diana of Poitiers, is at the Hague, where the Hollanders call it "Frivolity" or "Vanity." Leda, the bride of Jupiter, with the twins, Castor and Pollux, "playing among the shell-chips of their broken egg," is also at the Hague. Probably the celebrated _La Vierge aux Rochers_ ("The Virgin among the Rocks") was painted at this time. Of this Théophile Gautier says, "The aspect of the Virgin is mysterious and charming. A grotto of basaltic rocks shelters the divine group, who are sitting on the margin of a clear spring, in the transparent depths of which we see the pebbles of its bed. Through the arcade of the grotto, we discover a rocky landscape, with a few scattered trees, and crossed by a stream, on the banks of which rises a village. All this is of a color as indefinable as those mysterious countries one traverses in a dream, and accords marvellously with the figures. What more adorable type than that of the Madonna! it is especially Leonardo's, and does not in any way recall the Virgins of Perugino or Raphael. Her head is spherical in form; the forehead well developed; the fine oval of her cheeks is gracefully rounded so as to enclose a chin most delicately curved; the eyes with lowered eyelids encircled with shadow, and the nose, not in a line with the forehead, like that of a Grecian statue, but still finely shaped; with nostrils tenderly cut, and trembling as though her breathing made them palpitate; the mouth a little large, it is true, but smiling with a deliciously enigmatic expression that Da Vinci gives to his female faces, a tiny shade of mischief mingling with the purity and goodness. The hair is long, loose, and silky, and falls in crisp meshes around the shadow-softened cheeks, according with the half-tints with incomparable grace." This picture was originally on wood, but has been transferred to canvas. There are three pictures of this scene; the one in the collection of the Duke of Suffolk is believed to be the original, while that in the Louvre is best known. Of the Virgin seated on the knees of St. Anne, now in the Louvre, Taine says, "In the little Jesus of the picture of St. Anne, a shoulder, a cheek, a temple, alone emerge from the shadowy depth. Leonardo da Vinci was a great musician. Perhaps he found in that gradation and change of color, in that vague yet charming magic of chiaroscuro, an effect resembling the crescendoes and decrescendoes of grand musical works." "St. John the Baptist," in the Louvre, is one of the few pictures, among the many attributed to Leonardo, which critics regard as authentic. "St. Sebastian," now in the Hermitage in St. Petersburg, was purchased by the Tsar of Russia in 1860, for twelve thousand dollars.