Callisto raised herself as well as she could, lifting up her paws to beg mercy of the gods and uttering frightful roars as she bemoaned her fate. She had always been obliged to defend herself from the lions and wolves that haunted the forest and she felt that she would be at their mercy now. All at once, though, she understood what had happened to her. She, herself, was now no longer a mortal but a wild beast. Juno had persuaded Jupiter to change Callisto to the first bear.
She had never liked to be out in the wood at night, but now she had no shelter and had to roam through the darkness, pursued often by the same wild beasts whom it had been her custom to hunt before. She fled from her own dogs in terror and was in hourly terror of the same arrows which she had formerly aimed so straight. In the winter Callisto crawled into some hollow log or dug a cave for herself that she might keep alive during the season of the North Wind's reign, and when spring came she crawled out, lean and weak, to search for the wild bee's comb and the first juicy berries of the juniper.
One day a boy saw the bear as he was out hunting. Callisto saw him at the same time and realized that he was her own son, Arcas, now grown to be a tall youth and taking his part in the chase as his mother had so many seasons before. Callisto forgot her changed form in her great joy at seeing her son, and she arose to her hind feet and hastened toward him holding out her paws to embrace him. The boy, alarmed, raised his hunting spear and ran to meet the bear and thrust its point through her heart. Callisto's son would have killed her if Jupiter had not, just then, looked down on the forest from his throne and felt a sudden pity for the tragedy he had brought about.
The gods had made a long road in the sky that led to the palace of the Sun. Any one may see this road on a clear night, for it stretches across the face of the sky and is known as the Milky Way. The palaces of the illustrious gods stood on either side of the road and a little farther back were placed the homes of the lesser deities.
At the very moment that Arcas, his spear raised, rushed upon Callisto, two new comers appeared in the sky near the road of the gods. They had the form of a Great Bear and a Little Bear, but their bodies were made of brightly shining stars. The mighty Jupiter had transformed Callisto and her son into these two constellations.
How enraged Juno was when she found it out! She descended to the sea and told her troubles to Oceanus, a giant of the race of Titans who ruled the waters at that time.
"Do you wonder, Oceanus," Juno cried, "why I, the queen of the gods, have left the heavenly plains and seek your depths? It is because my authority has been set aside. I shall be supplanted among my fellow gods, for Callisto, the bear, has been taken up to the skies and given a place among the stars. Who can deny but that she may not occupy my throne next!"
"What would you have me do about it?" old Oceanus asked, a little puzzled as to why Juno had consulted him.
"I forbade Callisto to keep her human form and my will has been unjustly set aside," Juno replied. "Now that she has an abode on the road to heaven she will be able to take any form she desires and may come to you for help in her attempt to steal my throne. I command you to never allow the stars of her constellation to touch the waters."