After the invocation to the Muses, a curious survival of classical imagery with which in one form or another each division of the poem begins, Dante relates how, on emerging from the lower world, as Easter Day was dawning the poets found themselves on an island with the first gleam of day just visible on the distant sea. Venus is shining in the eastern heaven; and four stars, “never seen save by the earliest of mankind,” are visible to the south. No doubt some tradition or report of the Southern Cross had reached men’s ears in Europe; but the symbolical meaning is more important, and there can be no doubt that the stars denote the four “cardinal” or natural or active virtues of fortitude, temperance, justice, and prudence. In the evening, as we shall see later on, their place is taken by three other stars, which symbolise the theological or Christian or contemplative virtues--faith, hope, charity. On turning again Dante sees close at hand an old man of venerable countenance, who questions them by what right they had come. Virgil recognises him for Cato of Utica, the Roman Republican patriot. His position here, as warder of the mount of purification, is very curious, and has never been thoroughly explained. Among other things it is probable that Dante was influenced by the Virgilian line in which Cato is introduced as the lawgiver of good men in the after-world. Being satisfied with the explanation given, Cato directs them to the shore, where Virgil is to wash the grime of Hell from Dante’s face, and gird him with a rush, as an emblem of humility. When this has been done and as the sun is rising (Canto ii.) a light is seen approaching over the water. As it draws near, it is seen to be an angel. His wings form the sails to a boat which comes to the shore, freighted with more than a hundred souls on their way to Purgatory. They are chanting the Easter Psalm _In exitu Israel_; at the sign of the cross made by the angel they come ashore, and begin by inquiring the way of Virgil. While he is explaining that he is no less strange to the country than they are, some of them perceive that Dante is a living man, and all crowd around him. Among them he recognises a friend, the musician Casella, who, after some affectionate words have passed between them, begins at Dante’s request to sing one of the poet’s own odes; and the crowd listen intently. But Cato comes up, and bidding them delay no longer, drives them like a flock of frightened pigeons towards the mountain.