When the Emperor of Russia was at Rome, four or five years ago, he engaged Barberi, the worker in mosaic, to undertake certain large works, and with the instruction of six Russian students with a view to the establishment of a great school of mosaic art in St. Petersburgh. Since that time Barberi and his pupils have been occupied with works for the imperial residence, the last of which, just completed, consists of an octagonal mosaic pavement, from the ancient design of the round hall in the Vatican Museum, with twenty-eight figures, a colossal head of Medusa in the centre, and a variety of ornaments, all inclosed in a brilliant wreath of fruits, flowers, and foliage. The series already executed consist of four scenic masques, each of which is valued at £5200 sterling. With these finished works Cavaliere Barberi is about to forward to St. Petersburgh a number of vitreous mosaic tablets of every shade and style of drawing and decoration, as models for younger students. * * * * * TENERANI, the most eminent of contemporary Italian sculptors, has finished a statue of Bolivar. The figure is standing, full draped, and holding a laurel crown in the left hand. The pediment is ornamented with three bas-reliefs, the three provinces, Peru, Bolivia, and Colombia. Two statues, Justice and Liberality, symbols of the hero's virtues, stand at the side of the monument, which will be erected in the cathedral of Caraccas. It is a fine instance of the beauty and delicate grace of Tenerani's treatment. The expressive head of "The Liberator," with the high, arched brow, the large, soft, and sagacious eyes, the sharply chiselled but agreeable features, beaming with intellectual radiance, are happily conceived and exquisitely executed. In the same kind we note an equestrian statue of Bernadotte by TOGELBERG, a Swede resident in Rome. The horseman's mantle has fallen aside, the staff of a commander is in his hand, and the able marshal, "king that shall be," looks graciously down from his horse. In his face there is the imperial force of military genius, with the genial grace of sensibility. The horse is finely done. * * * * *