“You can’t,” he replied. “Don’t ask me why, please, for if you don’t know I can’t inform you.”

“Why not?” said Ann; but Shaggy paid no attention to the question.

This end of the Tube had a silver rim and around it was a gold railing to which was attached a sign that read:

“IF YOU ARE OUT, STAY THERE.
IF YOU ARE IN, DON’T COME OUT.”

On a little silver plate just inside the Tube was engraved the words:

Burrowed and built by
Hiergargo the Magician,
In the Year of the World

19625478
For his own exclusive uses.”

“He was some builder, I must say,” remarked Betsy, when she had read the inscription; “but if he had known about that star I guess he’d have spent his time playing solitaire.”

“Well, what are we waiting for?” inquired Shaggy, who was impatient to start.

“Quox,” replied Tubekins. “But I think I hear him coming.”

“Is the young dragon invisible?” asked Ann, who had never seen a live dragon and was a little fearful of meeting one.