Earlier in date than the Library of the Senate is the large mural painting in wax colours of the "Pieta" in the Church of St. Denis-du-Saint-Sacrement. It bears the date 1843, and is, apart from the passionate intensity of movement and expression, and its linear rhythm, interesting as an instance of the almost incredible rapidity with which Delacroix proceeded upon the actual execution of his paintings, once the scheme had taken definite shape in his mind. According to Moreau, who had this information from the artist himself, the whole painting of about 15 ft. by 11 ft. was finished in seventeen days, each day's progress being marked by Delacroix on the wall. The decoration of the two Libraries was scarcely finished when two new commissions of equal importance gave him further opportunity for the triumphant display of his decorative genius. A few sketches and engravings are unfortunately all that is left to us of the circular centre, the eight shaped oblong panels and the eleven lunettes which constituted the pictorial decoration of the Salon de la Paix at the old Hotel de Ville, since the building was destroyed by fire in May 1871 in the days of the Commune. Delacroix worked on these designs from 1849 to 1853, and was only paid L1200 for the whole series. If the labour and thought expended upon the Salon de la Paix were destined to lead to such short-lived results, the magnificent centrepiece of the ceiling in the Salon d'Apollon can be seen to-day in its unimpaired freshness--the most striking testimony to its creator's genius. The decoration of this gallery was entrusted to Le Brun as far back as 1661; and it was Louis XIV.'s favourite painter who conceived the idea of paying homage to his master, the "Roi Soleil," by depicting "The Triumph of Apollo" in the centre panel, with appropriate subjects in the other ten compartments. But his work was interrupted, when he was called upon to supervise the decoration of Versailles, before he had even sketched out the design for "The Triumph of Apollo." The ten minor compartments remained neglected for over a century, and were allowed to get into a deplorable condition, until the restoration was taken in hand in 1848, the painting of the great centre being at the same time entrusted to Delacroix. Apart from the fact that Apollo was to be the hero of the design, Delacroix had an entirely free hand, and chose to depict the god vanquishing the Python, with Diana, Mercury, Minerva, Hercules, Vulcan, Boreas, Zephyrus, Victory, Iris, and Nymphs as subsidiary figures. Although the design offends against the fundamental rule of all ceiling decorations, that there should be no "above" and "below," and that the composition should be devised so as to be equally intelligible from every point of view, one cannot but admire the noble co- and subordination of the different groups and figures, the lucid clearness of the pictorial statement of an