Guido Reni, whose superb paintings are among the gems of the Vatican, in the height of his fame would not touch pencil or brush except in full dress. He ruined himself by gambling and dissolute habits, and became lost as to all ambition for that art which had been so grand a mistress to him in the beginning. He finally arrived at that stage where he lost at the gaming-table and in riotous living what he earned by contract under one who managed his affairs, giving him a stipulated sum for just so much daily work in his studio. Such was the famous author of that splendid example of art, the "Martyrdom of Saint Peter," in the Vatican. Parmigiano, the eminent painter, was full of the wildness of genius. He became mad after the philosopher's stone, jilting art as a mistress, though his eager creditors forced him to set once more to work, though to little effect. Great painters, like great writers, have had their peculiar modes of producing their effects. Thus Domenichino was accustomed to assume and enact before the canvas the passion and character he intended to depict with the brush. While engaged upon the "Martyrdom of Saint Andrew," Caracci, a brother painter, came into his studio and found him in a violent passion. When this fit of abstraction had passed, Caracci embraced him, admitting that Domenichino had proved himself his master, and that he had learned from him the true manner of expressing sentiment or passion upon the canvas. Richard Wilson, the eminent English landscape-painter, strove in vain, he said, to paint the motes dancing in the sunshine. A friend coming into his studio found the artist sitting dejected on the floor, looking at his last work. The new-comer examined the canvas and remarked critically that it looked like a broad landscape just after a shower. Wilson started to his feet in delight, saying, "That is the effect I intended to represent, but thought I had failed." Poor Wilson possessed undoubted genius, but neglected his art for brandy, and was himself neglected in turn. He was one of the original members of the Royal Academy. Undoubtedly, genius is at times nonplussed and at fault, like plain humanity, and is helped out of a temporary dilemma by accident,--as when Poussin the painter, having lost all patience in his fruitless attempts to produce a certain result with the brush, impatiently dashed his sponge against the canvas and brought out thereby the precise effect desired; namely, the foam on a horse's mouth.