I suppose that Polychrome, and perhaps Queen Ann and her Army, might have been able to dispel the enchantment of Ruggedo's Chief Magician had they known that danger lay in their pathway; for the Rainbow's Daughter was a fairy and as Oogaboo is a part of the Land of Oz its inhabitants cannot easily be deceived by such common magic as the Nome King could command. But no one suspected any especial danger until after they had entered Ruggedo's cavern, and so they were journeying along in quite a contented manner when Tik-Tok, who marched ahead, suddenly disappeared.  
The officers thought he must have turned a corner, so they kept on their way and all of them likewise disappeared—one after another. Queen Ann was rather surprised at this, and in hastening forward to learn the reason she also vanished from sight.
 
Betsy Bobbin had tired her feet by walking, so she was now riding upon the back of the stout little mule, facing backward and talking to Shaggy and Polychrome, who were just behind. Suddenly Hank pitched forward and began falling and Betsy would have tumbled over his head had she not grabbed the mule's shaggy neck with both arms and held on for dear life.
 
All around was darkness, and they were not falling directly downward but seemed to be sliding along a steep incline. Hank's hoofs were resting upon some smooth substance over which he slid with the swiftness of the wind. Once Betsy's heels flew up and struck a similar substance overhead. They were, indeed, descending the "Hollow Tube" that led to the other side of the world.
 
"Stop, Hank—stop!" cried the girl; but Hank only uttered a plaintive "Hee-haw!" for it was impossible for him to obey.
 
After several minutes had passed and no harm had befallen them, Betsy gained courage. She could see nothing at all, nor could she hear anything except the rush of air past her ears as they plunged downward along the Tube. Whether she and Hank were alone, or the others were with them, she could not tell. But had some one been able to take a flash-light photograph of the Tube at that time a most curious picture would have resulted. There was Tik-Tok, flat upon his back and sliding headforemost down the incline. And there were the Officers of the Army of Oogaboo, all tangled up in a confused crowd, flapping their arms and trying to shield their faces from the clanking swords, which swung back and forth during the swift journey and pommeled everyone within their reach. Now followed Queen Ann, who had struck the Tube in a sitting position and went flying along with a dash and abandon that thoroughly bewildered the poor lady, who had no idea what had happened to her. Then, a little distance away, but unseen by the others in the inky darkness, slid Betsy and Hank, while behind them were Shaggy and Polychrome and finally Files and the Princess.
 
When first they tumbled into the Tube all were too dazed to think clearly, but the trip was a long one, because the cavity led straight through the earth to a place just opposite the Nome King's dominions, and long before the adventurers got to the end they had begun to recover their wits.
 
"This is awful, Hank!" cried Betsy in a loud voice, and Queen Ann heard her and called out: "Are you safe, Betsy?"
 
"Mercy, no!" answered the little girl. "How could anyone be safe when she's going about sixty miles a minute?" Then, after a pause, she added: "But where do you s'pose we're going to, Your Maj'sty?"
 
"Don't ask her that, please don't!" said Shaggy, who was not too far away to overhear them. "And please don't ask me why, either."
 
"Why?" said Betsy.
 
"No one can tell where we are going until we get there," replied Shaggy, and then he yelled "Ouch!" for Polychrome had overtaken him and was now sitting on his head.
 
The Rainbow's Daughter laughed merrily, and so infectious was this joyous laugh that Betsy echoed it and Hank said "Hee haw!" in a mild and sympathetic tone of voice.
 
"I'd like to know where and when we'll arrive, just the same," exclaimed the little girl.
 
"Be patient and you'll find out, my dear," said Polychrome. "But isn't this an odd experience? Here am I, whose home is in the skies, making a journey through the center of the earth—where I never expected to be!"
 
"How do you know we're in the center of the earth?" asked Betsy, her voice trembling a little through nervousness.
 
"Why, we can t be anywhere else," replied Polychrome. "I have often heard of this passage, which was once built by a Magician who was a great traveler. He thought it would save him the bother of going around the earth's surface, but he tumbled through the Tube so fast that he shot out at the other end and hit a star in the sky, which at once exploded."
 
"The star exploded?" asked Betsy wonderingly.
 
"Yes; the Magician hit it so hard."
 
"And what became of the Magician?" inquired the girl.
 
"No one knows that," answered Polychrome. "But I don't think it matters much."
 
"It matters a good deal, if we also hit the stars when we come out," said Queen Ann, with a moan.
 
"Don't worry," advised Polychrome. "I believe the Magician was going the other way, and probably he went much faster than we are going."
 
"It's fast enough to suit me," remarked Shaggy, gently removing Polychrome's heel from his left eye. "Couldn't you manage to fall all by yourself, my dear?"
 
"I'll try," laughed the Rainbow's Daughter.
 
All this time they were swiftly falling through the Tube, and it was not so easy for them to talk as you may imagine when you read their words. But although they were so helpless and altogether in the dark as to their fate, the fact that they were able to converse at all cheered them, considerably.
 
Files and Ozga were also conversing as they clung tightly to one another, and the young fellow bravely strove to reassure the Princess, although he was terribly frightened, both on her account and on his own.
 
An hour, under such trying circumstances, is a very long time, and for more than an hour they continued their fearful journey. Then, just as they began to fear the Tube would never end, Tik-Tok popped out into broad daylight and, after making a graceful circle in the air, fell with a splash into a great marble fountain.
 
Out came the officers, in quick succession, tumbling heels over head and striking the ground in many undignified attitudes.
 
"For the love of sassafras!" exclaimed a Peculiar Person who was hoeing pink violets in a garden. "What can all this mean?"
 
For answer, Queen Ann sailed up from the Tube, took a ride through the air as high as the treetops, and alighted squarel............