The most celebrated antique vase is that which, during more than two centuries, was the principal ornament of the Barberini Palace, and which is now known as the Portland Vase. It was found about the middle of the 16th century, enclosed in a marble sarcophagus within a sepulchral chamber under Monte del Grano, two miles and a half from Rome, supposed to have been the tomb of Alexander Severus, who died in the year 235. It is ornamented with white opaque figures in bas-relief, upon a dark blue transparent ground; the subject of which has not hitherto received a satisfactory elucidation, though it is supposed to represent the Eleusinian Mysteries; but the design, and more particularly the execution, are truly admirable. The whole of the blue ground, or at least the part below the handles, must have been originally covered with white enamel, out of which the figures have been sculptured in the style of a cameo, with most astonishing skill and labor. This beautiful Vase is sufficient to prove that the manufacture of glass was carried to a state of high perfection by the ancients. It was purchased by the Duchess of Portland for 1000 guineas, and presented to the British Museum in 1810. The subterranean ruins of Herculaneum afforded many specimens of the glass manufacture of the ancients: a great variety of phials and bottles were found, and these were chiefly of an elongate shape, composed of glass of unequal thickness, of a green color, and much heavier than common glass; of these the four large cinerary urns in the British Museum are very fine specimens. They are of an elegant round figure, with covers, and two double handles, the formation of which must convince persons capable of appreciating the difficulties which even the modern glass-maker would have in executing similar handles, that the ancients were well acquainted with the art of making round glass vessels; although their knowledge appears to have been extremely limited as respects the manufacture of square vessels, and more particularly of oval, octagonal, or pentagonal forms. Among a great number of lachrymatories and various other vessels in the British Museum, there is a small square bottle with a handle, the rudeness of which sufficiently bears out this opinion. ANCIENT PICTURES OF GLASS.