There is a diptych of perhaps the fifth century in the treasury of the cathedral of Monza; one leaf representing Calliope sounding the lyre, and the other some unknown philosopher. Mr. Oldfield, in his excellent catalogue with very valuable notes of the Arundel series of fictile ivories, supposes the muse to be some Roman lady in an ideal character. He objects to Gori’s suggestion that the other leaf represents a poet, taking the characteristics to be those certainly of a philosopher. Another is in the public library at Paris, the two leaves having six muses, each of them accompanied by an author. These last have been guessed at by M. de Witte, who places the diptych in the fourth century. Neither M. Pulszky nor professor Westwood is inclined to agree with these guesses, except that one may perhaps be Euripides grouped with Melpomene. The workmanship is rude and the figures carved in high relief. Again, another diptych at Vienna in the cabinet of antiquities, is attributed to the time of Justinian. One leaf has a figure representing Rome; the other, Constantinople. The above are all named in the essay attached to the catalogue of the Fejérváry collection by M. Pulszky; and professor Westwood very rightly adds to them one leaf of a diptych in the possession of count Auguste de Bastard, the diptych of St. Gall, the mythological figure of Penthea in the museum of the hôtel Cluny, a perfect diptych in the cathedral of Novara, and another in the basilica of San Gaudenzio at the same place.