The Rain King got too much water in his basin and spilled some over the brim. That made it rain in a certain part of the country—a real hard shower, for a time—and sent the Rainbow scampering to the place to show the gorgeous colors of his glorious bow as soon as the mist of rain had passed and the sky was clear.  
The coming of the Rainbow is always a joyous event to earth folk, yet few have ever seen it close by. Usually the Rainbow is so far distant that you can observe its splendid hues but dimly, and that is why we seldom catch sight of the dancing Daughters of the Rainbow.
 
In the barren country where the rain had just fallen there appeared to be no human beings at all; but the Rainbow appeared, just the same, and dancing gayly upon its arch were the Rainbow's Daughters, led by the fairylike Polychrome, who is so dainty and beautiful that no girl has ever quite equalled her in loveliness.
 
Polychrome was in a merry mood and danced down the arch of the bow to the ground, daring her sisters to follow her. Laughing and gleeful, they also touched the ground with their twinkling feet; but all the Daughters of the Rainbow knew that this was a dangerous pastime, so they quickly climbed upon their bow again.
 
All but Polychrome. Though the sweetest and merriest of them all, she was likewise the most reckless. Moreover, it was an unusual sensation to pat the cold, damp earth with her rosy toes. Before she realized it the bow had lifted and disappeared in the billowy blue sky, and here was Polychrome standing helpless upon a rock, her gauzy draperies floating about her like brilliant cobwebs and not a soul—fairy or mortal—to help her regain her lost bow!
 
"Dear me!" she exclaimed, a frown passing across her pretty face, "I'm caught again. This is the second time my carelessness has left me on earth while my sisters returned to our Sky Palaces. The first time I enjoyed some pleasant adventures, but this is a lonely, forsaken country and I shall be very unhappy until my Rainbow comes again and I can climb aboard. Let me think what is best to be done."
 
She crouched low upon the flat rock, drew her draperies about her and bowed her head.
 
It was in this position that Betsy Bobbin spied Polychrome as she came along the stony path, followed by Hank, the Princess and Shaggy. At once the girl ran up to the radiant Daughter of the Rainbow and exclaimed:
 
"Oh, what a lovely, lovely creature!"
 
Polychrome raised her golden head. There were tears in her blue eyes.
 
"I'm the most miserable girl in the whole world!" she sobbed.
 
The others gathered around her.
 
"Tell us your troubles, pretty one," urged the Princess.
 
"I—I've lost my bow!" wailed Polychrome.
 
"Take me, my dear," said Shaggy Man in a sympathetic tone, thinking she meant "beau" instead of "bow."
 
"I don't want you!" cried Polychrome, stamping her foot imperiously; "I want my Rainbow."
 
"Oh; that's different," said Shaggy. "But try to forget it. When I was young I used to cry for the Rainbow myself, but I couldn't have it. Looks as if you couldn't have it, either; so please don't cry."
 
Polychrome looked at him reproachfully.
 
"I don't like you," she said.
 
"No?" replied Shaggy, drawing the Love Magnet from his pocket; "not a little bit?—just a wee speck of a like?"
 
"Yes, yes!" said Polychrome, clasping her hands in ecstasy as she gazed at the enchanted talisman; "I love you, Shaggy Man!"
 
"Of course you do," said he calmly; "but I don't take any credit for it. It's the Love Magnet's powerful charm. But you seem quite alone and friendless, little Rainbow. Don't you want to join our party until you find your father and sisters again?"
 
"Where are you going?" she asked.
 
"We don't just know that," said Betsy, taking her hand; "but we're trying to find Shaggy's long-lost brother, who has been captured by the terrible Metal Monarch. Won't you come with us, and help us?"
 
Polychrome looked from one to another of the queer party of travelers and a bewitching smile suddenly lighted her face.
 
"A donkey, a mortal maid, a Rose Princess and a Shaggy Man!" she exclaimed. "Surely you need help, if you intend to face Ruggedo."
 
"Do you know him, then?" inquired Betsy.
 
"No, indeed. Ruggedo's caverns are beneath the earth's surface, where no Rainbow can ever penetrate. But I've heard of the Metal Monarch. He is also called the Nome King, you know, and he has made trouble for a good many people—mortals and fairies—in his time," said Polychrome.
 
"Do you fear him, then?" asked the Princess, anxiously.
 
"No one can harm a Daughter of the Rainbow," said Polychrome proudly. "I'm a sky fairy."
 
"Then," said Betsy, quickly, "you will be able to tell us the way to Ruggedo's cavern."
 
"No," returned Polychrome, shaking her head, "that is one thing I cannot do. But I will gladly go with you and help you search for the place."
 
This promise delighted all the wanderers and after the Shaggy Man had found the path again they began moving along it in a more happy mood. The Rainbow's Daughter danced lightly over the rocky trail, no longer sad, but with her beautiful features wreathed in smiles. Shaggy came next, walking steadily and now and then supporting the Rose Princess, who followed him. Betsy and Hank brought up the rear, and if she tired with walking the girl got upon Hank's back and let the stout little donkey carry her for awhile.
 
At nightfall they came to some trees that grew beside a tiny brook and here they made camp and rested until morning. Then away they tramped, finding berries and fruits here and there which satisfied the hunger of Betsy, Shaggy and Hank, so that they were well content with their lot.
 
It surprised Betsy to see the Rose Princess partake of their food, for she considered her a fairy; but when she mentioned this to Polychrome, the Rainbow's Daughter explained that when Ozga was driven out of her Rose Kingdom she ceased to be a fairy and would never again be more than a mere mortal. Polychrome, however, was a fairy wherever she happened to be, and if she sipped a few dewdrops by moonlight for refreshment no one ever saw her do it.
 
As they continued their wandering journey, direction meant very little to them, for they were hopelessly lost in this strange country. Shaggy said it would be best to go toward the mountains, as the natural entrance to Ruggedo's underground cavern was likely to be hidden in some rocky, deserted place; but mountains seemed all around them except in the one direction that they had come from, which led to the Rose Kingdom and the sea. Therefore it mattered little which way they traveled.
 
By and by they espied a faint trail that looked like a path and after following this for some time they reached a crossroads. Here were many paths, leading in various directions, and there was a signpost so old that there were now no words upon the sign. At one side was an old well, with a chain windlass for drawing water, yet there was no house or other building anywhere in sight.
 
While the party halted, puzzled which way to proceed, the mule approached the well and tried to look into it.
 
"He's thirsty," said Betsy.
 
"It's a dry well," remarked Shaggy. "Probably there has been no water in it for many years. But, come; let us decide which way to travel."
 
No one seemed able to decide that. They sat down in a group and tried to consider which road might be the best to take. Hank, however, could not keep away from the well and finally he reared up on his hind legs, got his head over the edge and uttered a loud "Hee-haw!" Betsy watched her animal friend curiously.
 
"I wonder if he sees anything down there?" she said.
 
At this, Shaggy rose and went over to the well to investigate, and Betsy went with him. The Princess and Polychrome, who had become fast friends, linked arms and sauntered down one of the roads, to find an easy path.
 
"Really," said Shaggy, "there does seem to be something at the bottom of this old well."
 
"Can't we pull it up, and see what it is?" ............