t of plateau above which was lifted, at a height of two hundred
feet or more, the whale's hump.

Its sides were heaped with masses of hardened lava in all kinds of
grotesque shapes. It was utterly desolate and bare. Ruth shuddered as
she looked at the weird scene.

"I don't wonder that some place around here is called the Witch's
Head," she remarked. "This must be like the place where Macbeth saw
the witches brewing their potions."

"Except that they brewed them 'in lightning, thunder and in rain',"
said Drew. "Those are the only things that are missing."

He had scarcely spoken when there was a rumbling that sounded like
thunder. Drew was startled, and Ruth grew slightly pale.

"That's funny," remarked Tyke. "Weather's as clear as a bell too.
This ain't the hurricane season."

The captain was in a brown study, seemingly unheedful of the rumbling
sound. In a moment he roused himself and said:

"Well, now let's scatter about and see if we can find anything that
looks like The Three Sisters or the Witch's Head."

Grimshaw sat down to rest, not wishing to put too heavy a strain on the
leg that had been injured, and the others wandered about for half an
hour trying to discover anything that might be identified as the places
named on the map. But their efforts were fruitless, and the captain,
looking at his watch, called a halt.

"Nothing more doing now," he said. "We have only time to get back to
the boat. But we've got our bearings and have done a good afternoon's
work. To-morrow's a new day, and we'll get on the job early."

Reluctantly, the little party went back to the boat. They found the
crew waiting for them and were pulled rapidly to the schooner, whose
anchor lights were already gleaming like fireflies in the sudden dusk.

CHAPTER XX

THE EARTH TREMBLES

It was with a feeling of relief after their surroundings of the last
few hours, that the treasure seekers found themselves again on board
the _Bertha Hamilton_ and seated in the bright cabin at the appetizing
and abundant meal that Wah Lee had prepared for them.

All four felt jubilant at the discoveries they had made. Drew and Ruth
were sure that they were on the very brink of finding the pirate hoard,
and might, that very afternoon, have uncovered it if they had had a few
more hours of daylight. To-morrow, they felt sure, would find them in
possession of the doubloons.

Drew's personal trouble had been for the moment obscured