[Picture: Hercules fighting the Lion] There was a second labour ready for Hercules—namely, the destroying a serpent with nine heads, called Hydra, whose lair was the marsh of Lerna. Hercules went to the battle, and managed to crush one head with his club, but that moment two sprang up in its place; moreover, a huge crab came out of the swamp, and began to pinch his heels. Still he did not lose heart, but, calling his friend Iolaus, he bade him take a fire-brand and burn the necks as fast as he cut off the heads; and thus at last they killed the creature, and Hercules dipped his arrows in its poisonous blood, so that their least wound became fatal. Eurystheus said that it had not been a fair victory, since Hercules had been helped, and Juno put the crab into the skies as the constellation Cancer; while a labour to patience was next devised for Hercules—namely, the chasing of the Arcadian stag, which was sacred to Diana, and had golden horns and brazen hoofs. Hercules hunted it up hill and down dale for a whole year, and when at last he caught it, he got into trouble with Apollo and Diana about it, and had hard work to appease them; but he did so at last; and for his fourth labour was sent to catch alive a horrid wild boar on Mount Erymanthus. He followed the beast through a deep swamp, caught it in a net, and brought it to Mycenæ. [Picture: Hercules fighting the Hydra] The fifth task was a curious one. Augeas, king of Elis, had immense herds, and kept his stables and cow-houses in a frightful state of filth, and Eurystheus, hoping either to disgust Hercules or kill him by the unwholesomeness of the work, sent him to clean them. Hercules, without telling Augeas it was his appointed task, offered to do it if he were repaid the tenth of the herds, and received the promise on oath. Then he dug a canal, and turned the water of two rivers into the stables, so as effectually to cleanse them; but when Augeas heard it was his task, he tried to cheat him of the payment, and on the other hand Eurystheus said, as he had been rewarded, it could not count as one of his labours, and ordered him off to clear the woods near Lake Stymphalis of some horrible birds, with brazen beaks and claws, and ready-made arrows for feathers, which ate human flesh. To get them to rise out of the forest was his first difficulty, but Pallas lent him a brazen clapper, which made them take to their wings; then he shot them with his poisoned arrows, killed many, and drove the rest away.