The way taken by the adventurers led up hill and down dale and wound here and there in a fashion that seemed aimless. But always it drew nearer to a range of low mountains and Files said more than once that he was certain the entrance to Ruggedo's cavern would be found among these rugged hills.  
In this he was quite correct. Far underneath the nearest mountain was a gorgeous chamber hollowed from the solid rock, the walls and roof of which glittered with thousands of magnificent jewels. Here, on a throne of virgin gold, sat the famous Nome King, dressed in splendid robes and wearing a superb crown cut from a single blood-red ruby.
 
Ruggedo, the Monarch of all the Metals and Precious Stones of the Underground World, was a round little man with a flowing white beard, a red face, bright eyes and a scowl that covered all his forehead. One would think, to look at him, that he ought to be jolly; one might think, considering his enormous wealth, that he ought to be happy; but this was not the case. The Metal Monarch was surly and cross because mortals had dug so much treasure out of the earth and kept it above ground, where all the power of Ruggedo and his nomes was unable to recover it. He hated not only the mortals but also the fairies who live upon the earth or above it, and instead of being content with the riches he still possessed he was unhappy because he did not own all the gold and jewels in the world.
 
Ruggedo had been nodding, half asleep, in his chair when suddenly he sat upright, uttered a roar of rage and began pounding upon a huge gong that stood beside him.
 
The sound filled the vast cavern and penetrated to many caverns beyond, where countless thousands of nomes were working at their unending tasks, hammering out gold and silver and other metals, or melting ores in great furnaces, or polishing glittering gems. The nomes trembled at the sound of the King's gong and whispered fearfully to one another that something unpleasant was sure to happen; but none dared pause in his task.
 
The heavy curtains of cloth-of-gold were pushed aside and Kaliko, the King's High Chamberlain, entered the royal presence.
 
"What's up, Your Majesty?" he asked, with a wide yawn, for he had just wakened.
 
"Up?" roared Ruggedo, stamping his foot viciously. "Those foolish mortals are up, that's what! And they want to come down."
 
"Down here?" inquired Kaliko.
 
"Yes!"
 
"How do you know?" continued the Chamberlain, yawning again.
 
"I feel it in my bones," said Ruggedo. "I can always feel it when those hateful earth-crawlers draw near to my Kingdom. I am positive, Kaliko, that mortals are this very minute on their way here to annoy me—and I hate mortals more than I do catnip tea!"
 
"Well, what's to be done?" demanded the nome.
 
"Look through your spyglass, and see where the invaders are," commanded the King.
 
So Kaliko went to a tube in the wall of rock and put his eye to it. The tube ran from the cavern up to the side of the mountain and turned several curves and corners, but as it was a magic spyglass Kaliko was able to see through it just as easily as if it had been straight.
 
"Ho—hum," said he. "I see 'em, Your Majesty."
 
"What do they look like?" inquired the Monarch.
 
"That's a hard question to answer, for a queerer assortment of creatures I never yet beheld," replied the nome. "However, such a collection of curiosities may prove dangerous. There's a copper man, worked by machinery—"
 
"Bah! that's only Tik-Tok," said Ruggedo. "I'm not afraid of him. Why, only the other day I met the fellow and threw him down a well."
 
"Then some one must have pulled him out again," said Kaliko. "And there's a little girl—"
 
"Dorothy?" asked Ruggedo, jumping up in fear.
 
"No; some other girl. In fact, there are several girls, of various sizes; but Dorothy is not with them, nor is Ozma."
 
"That's good!" exclaimed the King, sighing in relief.
 
Kaliko still had his eye to the spyglass.
 
"I see," said he, "an army of men from Oogaboo. They are all officers and carry swords. And there is a Shaggy Man—who seems very harmless—and a little donkey with big ears."
 
"Pooh!" cried Ruggedo, snapping his fingers in scorn. "I've no fear of such a mob as that. A dozen of my nomes can destroy them all in a jiffy."
 
"I'm not so sure of that," said Kaliko. "The people of Oogaboo are hard to destroy, and I believe the Rose Princess is a fairy. As for Polychrome, you know very well that the Rainbow's Daughter cannot be injured by a nome."
 
"Polychrome! Is she among them?" asked the King.
 
"Yes; I have just recognized her."
 
"Then these people are coming here on no peaceful errand," declared Ruggedo, scowling fiercely. "In fact, no one ever comes here on a peaceful errand. I hate everybody, and everybody hates me!"
 
"Very true," said Kaliko.
 
"I must in some way prevent these people from reaching my dominions. Where are they now?"
 
"Just now they are crossing the Rubber Country, Your Majesty."
 
"Good! Are your magnetic rubber wires in working order?"
 
"I think so," replied Kaliko. "Is it your Royal Will that we have some fun with these invaders?"
 
"It is," answered Ruggedo. "I want to teach them a lesson they will never forget."
 
Now, Shaggy had no idea that he was in a Rubber Country, nor had any of his companions. They noticed that everything around them was of a dull gray color and that the path upon which they walked was soft and springy, yet they had no suspicion that the rocks and trees were rubber and even the path they trod was made of rubber.
 
Presently they came to a brook where sparkling water dashed through a deep channel and rushed away between high rocks far down the mountain-side. Across the brook were stepping-stones, so placed that travelers might easily leap from one to another and in that manner cross the water to the farther bank.
 
Tik-Tok was marching ahead, followed by his officers and Queen Ann. After them came Betsy Bobbin and Hank, Polychrome and Shaggy, and last of all the Rose Princess with Files. The Clockwork Man saw the stream and the stepping-stones and, without making a pause, placed his foot upon the first stone.
 
The result was astonishing. First he sank down in the soft rubber, which then rebounded and sent Tik-Tok soaring high in the air, where he turned a succession of flip-flops and alighted upon a rubber rock far in the rear of the party.
 
General Apple did not see Tik-Tok bound, so quickly had he disappeared; therefore he also stepped upon the stone (which you will guess was connected with Kaliko's magnetic rubber wire) and instantly shot upward like an arrow. General Cone came next and met with a like fate, but the others now noticed that something was wrong and with one accord they halted the column and looked back along the path.
 
There was Tik-Tok, still bounding from one rubber rock to another, each time rising a less distance from the ground. And there was General Apple, bounding away in another direction, his three-cornered hat jammed over his eyes and his long sword thumping him upon the arms and head as it swung this way and that. And there, also, appeared General Cone, who had struck a rubber rock headforemost and was so crumpled up that his round body looked more like a bouncing-ball than the form of a man.
 
Betsy laughed merrily at the strange sight and Polychrome echoed her laughter. But Ozga was grave and wondering, while Queen Ann became angry at seeing the chief officers of the Army of............