For a considerable distance the way led straight upward in a gentle incline, and the wanderers made such good progress that they grew hopeful and eager, thinking they might see sunshine at any minute. But at length they came unexpectedly upon a huge rock that shut off the passage and blocked them from proceeding a single step farther.
 
This rock was separate from the rest of the mountain and was in motion, turning slowly around and around as if upon a pivot. When first they came to it there was a solid wall before them; but presently it revolved until there was exposed a wide, smooth path across it to the other side. This appeared so unexpectedly that they were unprepared to take advantage of it at first, and allowed the rocky wall to swing around again before they had decided to pass over. But they knew now that there was a means of escape and so waited patiently until the path appeared for the second time.
 
The children and the Wizard rushed across the moving rock and sprang into the passage beyond, landing safely though a little out of breath. Jim the cab-horse came last, and the rocky wall almost caught him; for just as he leaped to the floor of the further passage the wall swung across it and a loose stone that the buggy wheels knocked against fell into the narrow crack where the rock turned, and became wedged there.
 
They heard a crunching, grinding sound, a loud snap, and the turn-table came to a stop with its broadest surface shutting off the path from which they had come.
 
"Never mind," said Zeb, "we don't want to get back, anyhow."
 
"I'm not so sure of that," returned Dorothy. "The mother dragon may come down and catch us here."
 
"It is possible," agreed the Wizard, "if this proves to be the path she usually takes. But I have been examining this tunnel, and I do not see any signs of so large a beast having passed through it."
 
"Then we're all right," said the girl, "for if the dragon went the other way she can't poss'bly get to us now."
 
"Of course not, my dear. But there is another thing to consider. The mother dragon probably knows the road to the earth's surface, and if she went the other way then we have come the wrong way," said the Wizard, thoughtfully.
 
"Dear me!" cried Dorothy. "That would be unlucky, wouldn't it?"
 
"Very. Unless this passage also leads to the top of the earth," said Zeb. "For my part, if we manage to get out of here I'll be glad it isn't the way the dragon goes."
 
"So will I," returned Dorothy. "It's enough to have your pedigree flung in your face by those saucy dragonettes. No one knows what the mother might do."
 
They now moved on again, creeping slowly up another steep incline. The lanterns were beginning to grow dim, and the Wizard poured the remaining oil from one into the other, so that the one light would last longer. But their journey was almost over, for in a short time they reached a small cave from which there was no further outlet.
 
They did not realize their ill fortune at first, for their hearts were gladdened by the sight of a ray of sunshine coming through a small crack in the roof of the cave, far overhead. That meant that their world—the real world—was not very far away, and that the succession of perilous adventures they had encountered had at last brought them near the earth's surface, which meant home to them. But when the adventurers looked more carefully around them they discovered that there were in a strong prison from which there was no hope of escape.
 
"But we're ALMOST on earth again," cried Dorothy, "for there is the sun—the most BEAU'FUL sun that shines!" and she pointed eagerly at the crack in the distant roof.
 
"Almost on earth isn't being there," said the kitten, in a discontented tone. "It wouldn't be possible for even me to get up to that crack—or through it if I got there."
 
"It appears that the path ends here," announced the Wizard, gloomily.
 
"And there is no way to go back," added Zeb, with a low whistle of perplexity.
 
"I was sure it would come to this, in the end," remarked the old cab-horse. "Folks don't fall into the middle of the earth and then get back again to tell of their adventures—not in real life. And the whole thing has been unnatural because that cat and I are both able to talk your language, and to understand the words you say."
 
"And so can the nine tiny piglets," added Eureka. "Don't forget them, for I may have to eat them, after all."
 
"I've heard animals talk before," said Dorothy, "and no harm came of it."
 
"Were you ever before shut up in a cave, far under the earth, with no way of getting out?" enquired the horse, seriously.
 
"No," answered Dorothy. "But don't you lose heart, Jim, for I'm sure this isn't the end of our story, by any means."
 
The reference to the piglets reminded the Wizard that his pets had not enjoyed much exercise lately, and must be tired of their prison in his pocket. So he sat down upon the floor of the cave, brought the piglets out one by one, and allowed them to run around as much as they pleased.
 
"My dears," he said to them, "I'm afraid I've got you into a lot of trouble, and that you will never again be able to leave this gloomy cave."
 
"What's wrong?" asked a piglet. "We've been in the dark quite a while, and you may as well explain what has happened."
 
The Wizard told them of the misfortune that had overtaken the wanderers.
 
"Well," said another piglet, "you are a wizard, are you not?"
 
"I am," replied the little man.
 
"Then you can do a few wizzes and get us out of this hole," declared the tiny one, with much confidence.
 
"I could if I happened to be a real wizard," returned the master sadly. "But I'm not, my piggy-wees; I'm a humbug wizard."
 
"Nonsense!" cried several of the piglets, together.
 
"You can ask Dorothy," said the little man, in an injured tone.
 
"It's true enough," returned the girl, earnestly. "Our friend Oz is merely a humbug wizard, for he once proved it to me. He can do several very wonderful things—if he knows how. But he can't wiz a single thing if he hasn't the tools and machinery to work with."
 
"Thank you, my dear, for doing me justice," responded the Wizard, gratefully. "To be accused of being a real wizard, when I'm not, is a slander I will not tamely submit to. But I am one of the greatest humbug wizards that ever lived, and you will realize this when we have all starved together and our bones are scattered over the floor of this lonely cave."
 
"I don't believe we'll realize anything, when it comes to that," remarked Dorothy, who had been deep in thought. "But I'm not going to scatter my bones just yet, because I need them, and you prob'ly need yours, too."
 
"We are helpless to escape," sighed the Wizard.
 
"WE may be helpless," answered Dorothy, smiling at him, "but there are others who can do more than we can. Cheer up, friends. I'm sure Ozma will help us."
 
"Ozma!" exclaimed the Wizard. "Who is Ozma?"
 
"The girl that rules the marvelous Land of Oz," was the reply. "She's a friend of mine, for I met her in the Land of Ev, not long ago, and went to Oz with her."
 
"For the second time?" asked the Wizard, with great interest.
 
"Yes. The first time I went to Oz I found you there, ruling the Emerald City. After you went up in a balloon, and escaped us, I got back to Kansas by means of a pair of magical silver shoes."
 
"I remember those shoes," said the little man, nodding. "They once belonged to the Wicked Witch. Have you them here with you?"
 
"No; I l............