An oracle having foretold to Acrisius that a son of Danaë would be the cause of his death, he imprisoned her in a tower of brass in order to keep her secluded from the world. Zeus, however, descended through the roof of the tower in the form of a shower of gold, and the lovely Danaë became his bride.

For four years Acrisius remained in ignorance of this union, but one evening as he chanced to pass by the brazen chamber, he heard the cry of a young child proceeding from within, which led to the discovery of his daughter's marriage with Zeus. Enraged at finding all his precautions unavailing, Acrisius commanded the mother and child to be placed in a chest and thrown into the sea.

But it was not the will of Zeus that they should perish. He directed Poseidon to calm the troubled waters, and caused the chest to float safely to the island of Seriphus. Dictys, brother of Polydectes, king of the island, was fishing on the sea-shore when he saw the chest stranded on the beach; and pitying the helpless condition of its unhappy occupants, he conducted them to the palace of the king, where they were treated with the greatest kindness.

Polydectes eventually became united to Danaë, and

bestowed upon Perseus an education befitting a hero. When he saw his stepson develop into a noble and manly youth he endeavoured to instil into his mind a desire to signalize himself by the achievement of some great and heroic deed, and after mature deliberation it was decided that the slaying of the Gorgon, Medusa, would bring him the greatest renown.

For the successful accomplishment of his object it was necessary for him to be provided with a pair of winged sandals, a magic wallet, and the helmet of Aïdes, which rendered the wearer invisible, all of which were in the keeping of the Nymphs, the place of whose abode was known only to the Grææ. Perseus started on his expedition, and, guided by Hermes and Pallas-Athene, arrived, after a long journey, in the far-off region, on the borders of Oceanus, where dwelt the Grææ, daughters of Phorcys and Ceto. He at once applied to them for the necessary information, and on their refusing to grant it he deprived them of their single eye and tooth, which he only restored to them when they gave him full directions with regard to his route. He then proceeded to the abode of the Nymphs, from whom he obtained the objects indispensable for his purpose.

Equipped with the magic helmet and wallet, and armed with a sickle, the gift of Hermes, he attached to his feet the winged sandals, and flew to the abode of the Gorgons, whom he found fast asleep. Now as Perseus had been warned by his celestial guides that whoever looked upon these weird sisters would be transformed into stone, he stood with averted face before the sleepers, and caught on his bright metal shield their triple image. Then, guided by Pallas-Athene, he cut off the head of the Medusa, which he placed in his wallet. No sooner had he done so than from the headless trunk there sprang forth the winged steed Pegasus, and Chrysaor, the father of the winged giant Geryon. He now hastened to elude the pursuit of the two surviving sisters, who, aroused from their slumbers, eagerly rushed to avenge the death of their sister.

His invisible helmet and winged sandals here stood him in good stead; for the former concealed him from the view of the Gorgons, whilst the latter bore him swiftly over land and sea, far beyond the reach of pursuit. In passing over the burning plains of Libya the drops of blood from the head of the Medusa oozed through the wallet, and falling on the hot sands below produced a brood of many-coloured snakes, which spread all over the country.

Perseus continued his flight until he reached the kingdom of Atlas, of whom he begged rest and shelter. But as this king possessed a valuable orchard, in which every tree bore golden fruit, he was fearful lest the slayer of the Medusa might destroy the dragon which guarded it, and then rob him of his treasures. He therefore refused to grant the hospitality which the hero demanded, whereupon Perseus, exasperated at the churlish repulse, produced from his wallet the head of the Medusa, and holding it towards the king, transformed him into a stony mountain. Beard and hair erected themselves into forests; shoulders, hands, and limbs became huge rocks, and the head grew up into a craggy peak which reached into the clouds.