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.

Dorothy hopped inside the opening to escape being pricked, and Zeb and the Wizard, after enduring a few stabs from the thorns, were glad to follow her. At once the Mangaboos began piling up the rocks of glass again, and as the little man realized that they were all about to be entombed in the mountain he said to the children:

"My dears, what shall we do? Jump out and fight?"