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METAMORPHOSES BOOK IV the form of fish. The beast belches forth waters mixed with purple blood. Meanwhile Perseus' wings are growing heavy, soaked with spray, and he dares not depend further on his drenched pinions. He spies a rock whose top projects above the surface when the waves are still, but which is hidden by the roughened sea. Resting on this and holding an edge of the rock with his left hand, thrice and again he plunges his sword into the vitals of the monster. At this the shores and the high seats of the gods re-echo with wild shouts of applause. Cassiope and Cepheus rejoice and salute the hero as son-in-law, calling him prop and saviour of their house. The maiden also now comes forward, freed from chains, she, the prize as wel as cause of his feat. He washes his victorious hands in water drawn for him; and, that the Gorgon's snaky head may not be bruised on the hard sand, he softens the ground with leaves, strews seaweed over these, and lays on this the head of Medusa, daughter of Phorcys. The fresh weed twigs, but now alive and porous to the core, absorb the power of the monster and harden at its touch and take a strange stiffness in their stems and leaves. And the sea-nymphs test the wonder on more twigs and are delighted to find the same thing happening to them all; and, by scattering these twigs as seeds, propagate the . And even till this day the same nature has remained in coral so that they harden when exposed to air, and what was a pliant twig beneath the sea is turned to stone wondrous thing throughout their waters above. Now Perseus builds to three gods three altars of turf, the left to Mercury, the right to thee, O warlike maid. and the central one to Jove. To Minerva he slays a cow, a young bullock to the winged god, and 231