These nymphs had the power, as has been already said, of charming by their song all who heard them, so that mariners were impelled to cast themselves into the sea to destruction. Circe directed Ulysses to stop the ears of his seamen with wax, so that they should not hear the strain; to have himself bound to the mast, and to enjoin his people, whatever he might say or do, by no means to release him till they should have passed the Sirens' island. Ulysses obeyed these directions. As they approached the Sirens' island, the sea was calm, and over the waters came notes of music so ravishing and attractive that Ulysses struggled to get loose and, by cries and signs to his people, begged to be released; but they, obedient to his previous orders, sprang forward and bound him still faster. They held on their course, and the music grew fainter till it ceased to be heard, when with joy Ulysses gave his companions the signal to unseal their ears; and they relieved him from his bonds. It is said that one of the Sirens, Parthenope, in grief at the escape of Ulysses drowned herself. Her body was cast up on the Italian shore where now stands the city of Naples, in early times called by the Siren's name. [Illustration: FIG. 174. ULYSSES AND THE SIRENS] =239. Scylla and Charybdis.= Ulysses had been warned by Circe of the two monsters Scylla and Charybdis. We have already met with Scylla in the myth of Glaucus. She dwelt in a cave high up on the cliff, from whence she was accustomed to thrust forth her long necks (for she had six heads), and in each of her mouths to seize one of the crew of every vessel passing within reach. The other terror, Charybdis, was a gulf nearly on a level with the water. Thrice each day the water rushed into a frightful chasm, and thrice was disgorged. Any vessel coming near the whirlpool when the tide was rushing in must inevitably be engulfed; not Neptune himself could save it. On approaching the haunt of the dread monsters, Ulysses kept strict watch to discover them. The roar of the waters as Charybdis engulfed them gave warning at a distance, but Scylla could nowhere be discerned. While Ulysses and his men watched with anxious eyes the dreadful whirlpool, they were not equally on their guard from the attack of Scylla,[338] and the monster, darting forth her snaky heads, caught six of his men and bore them away shrieking to her den. Ulysses was unable to afford any assistance. [Illustration: FIG. 175. ULYSSES AND SCYLLA]