"That's so," agreed the boy. "They might as well have called it 'gingerbread' or 'rock-salt,' or 'tea-biscuit.' They call mountains funny names, don't they?"
"Seems as if they do," said Twinkle.
They had been sitting upon the edge of one big flat rock, with their feet resting against another that was almost as large. These rocks appeared to have been there for ages,—as if some big giants in olden days had tossed them carelessly down and then gone away and left them. Yet as the children pushed their feet against this one, the heavy mass suddenly began to tremble and then slide downward.
"Look out!" cried the girl, frightened to see the slab of rock move. "We'll fall and get hurt!"
But they clung to the rock upon which they sat and met with no harm whatever. Nor did the big slab of stone below them move very far from its original position.
It merely slid downward a few feet, and when they looked at the place where it had been they discovered what seemed to be a small iron door, built into the solid stone underneath, and now shown to their view by the moving of the upper rock.
"Why, it's a door!" exclaimed Twinkle.
Chubbins got down upon his knees and examined the door carefully. There was a ring in it that seemed to be a handle, and he caught hold of it and pulled as hard as he could. But it wouldn't move.
"It's locked, Twink," he said.
"What do you'spose is under it?" she asked.