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56 sovereignty." The mention of this possible release occasions a dialogue in which the connection of Io's fate with that of Prometheus is gradually disclosed:—

Thus mysteriously is it foretold how Hercules, the thirteenth from Io, should be the means of Prometheus's freedom. Prometheus goes on, at the earnest request of Io herself and of the Chorus, to tell the rest of her wanderings and the manner of his own release. Through many strange countries she is to pass, and see many monsters—the three Graiæ, with the shapes of swans, and only one eye and one tooth between them; the three Gorgons, their sisters; the one-eyed Arimaspians who dwell by the ford of Pluto; and at last, passing the Ethiopians, she is to come to the land of