Heracles, accompanied by his nephew Iolaus, set out in a chariot for the marsh of Lerna, in the slimy waters of which he found her. He commenced the attack by assailing her with his fierce arrows, in order to force her to leave her lair, from which she at length emerged, and sought refuge in a wood on a neighbouring hill. Heracles now rushed forward and endeavoured to crush her heads by means of well-directed blows from his tremendous club; but no sooner was one head destroyed than it was immediately replaced by two others. He next seized the monster in his powerful grasp; but at this juncture a giant crab came to the assistance of the Hydra and commenced biting the feet of her assailant. Heracles destroyed this new adversary with his club, and now called upon his nephew to come to his aid. At his command Iolaus set fire to the neighbouring trees,
and, with a burning branch, seared the necks of the monster as Heracles cut them off, thus effectually preventing the growth of more. Heracles next struck off the immortal head, which he buried by the road-side, and placed over it a heavy stone. Into the poisonous blood of the monster he then dipped his arrows, which ever afterwards rendered wounds inflicted by them incurable.
3. The Horned Hind.—The third labour of Heracles was to bring the horned hind Cerunitis alive to Mycenæ. This animal, which was sacred to Artemis, had golden antlers and hoofs of brass.
Not wishing to wound the hind Heracles patiently pursued her through many countries for a whole year, and overtook her at last on the banks of the river Ladon; but even there he was compelled, in order to secure her, to wound her with one of his arrows, after which he lifted her on his shoulders and carried her through Arcadia. On his way he met Artemis with her brother Phœbus-Apollo, when the goddess angrily reproved him for wounding her favourite hind; but Heracles succeeded in appeasing her displeasure, whereupon she permitted him to take the animal alive to Mycenæ.
4. The Erymantian Boar.—The fourth task imposed upon Heracles by Eurystheus was to bring alive to Mycenæ the Erymantian boar, which had laid waste the region of Erymantia, and was the scourge of the surrounding neighbourhood.
On his way thither he craved food and shelter of a Centaur named Pholus, who received him with generous hospitality, setting before him a good and plentiful repast. When Heracles expressed his surprise that at such a well-furnished board
wine should be wanting, his host explained that the wine-cellar was the common property of all the Centaurs, and that it was against the rules for a cask to be broached, except all were present to partake of it. By dint of persuasion, however, Heracles prevailed on his kind host to make an exception in his favour; but the powerful, luscious odour of the good old wine soon spread over the mountains, and brought large numbers of Centaurs to the spot, all armed with huge rocks and fir-trees. Heracles drove them back with fire-brands, and then, following up his victory, pursued them with his arrows as far as Malea, where they took refuge in the cave of the kind old Centaur Chiron. Unfortunately, however, as Heracles was shooting at them with his poisoned darts, one of these pierced the knee of Chiron. When Heracles discovered that it was the friend of his early days that he had wounded, he was overcome with sorrow and regret. He at once extracted the arrow, and anointed the wound with a salve, the virtue of which had been taught him by Chiron himself. But all his efforts were unavailing. The wound, imbued with the deadly poison of the Hydra, was incurable, and so great was the agony of Chiron that, at the intercession of Heracles, death was sent him by the gods; for otherwise, being immortal, he would have been doomed to endless suffering.
Pholus, who had so kindly entertained Heracles, also perished by means of one of these arrows, which he had extracted from the body of a dead Centaur. While he was quietly examining it, astonished that so small and insignificant an object should be productive of such serious results, the arrow fell upon his foot and fatally wounded him. Full of grief at this untoward event, Heracles buried him with due honours, and then set out to chase the boar.