When they came to the mountain it proved to be a rugged, towering chunk of deep green glass, and looked dismal and forbidding in the extreme. Half way up the steep was a yawning cave, black as night beyond the point where the rainbow rays of the colored suns reached into it.
The Mangaboos drove the horse and the kitten and the piglets into this dark hole and then, having pushed the buggy in after them--for it seemed some of them had dragged it all the way from the domed hall--they began to pile big glass rocks within the entrance, so that the prisoners could not get out again.
"This is dreadful!" groaned Jim. "It will be about the end of our adventures, I guess."
"If the Wizard was here," said one of the piglets, sobbing bitterly, "he would not see us suffer so."
"We ought to have called him and Dorothy when we were first attacked," added Eureka. "But never mind; be brave, my friends, and I will go and tell our masters where you are, and get them to come to your rescue."
The mouth of the hole was nearly filled up now, but the kitten gave a leap through the remaining opening and at once scampered up into the air. The Mangaboos saw her escape, and several of them caught up their thorns and gave chase, mounting through the air after her.
Eureka, however, was lighter than the Mangaboos, and while they could mount only about a hundred feet above the earth the kitten found she could go nearly two hundred feet. So she ran along over their heads until she had left them far behind and below and had come to the city and the House of the Sorcerer. There she entered in at Dorothy's window in the dome and aroused her from her sleep.
As soon as the little girl knew what had happened she awakened the Wizard and Zeb, and at once preparations were made to go to the rescue of Jim and the piglets. The Wizard carried his satchel, which was quite heavy, and Zeb carried the two lanterns and the oil can.
Dorothy's wicker suit-case was still under the seat of the buggy, and by good fortune the boy had also placed the harness in the buggy when he had taken it off from Jim to let the horse lie down and rest. So there was nothing for the girl to carry but the kitten, which she held close to her bosom and tried to comfort, for its little heart was still beating rapidly.
Some of the Mangaboos discovered them as soon as they left the House of the Sorcerer; but when they started toward the mountain the vegetable people allowed them to proceed without interference, yet followed in a crowd behind them so that they could not go back again.
Before long they neared the Black Pit, where a busy swarm of Mangaboos, headed by their Princess, was engaged in piling up glass rocks before the entrance.
"Stop, I command you!" cried the Wizard, in an angry tone, and at once began pulling down the rocks to liberate Jim and the piglets. Instead of opposing him in this they stood back in silence until he had made a good-sized hole in the barrier, when by order of the Princess they all sprang forward and thrust out their sharp thorns.
