“Perhaps to get water or to fish,” suggested Wendel. “Eh! what kind of a craft is this?”

As he spoke he bent down over a sort of coracle which lay in the sands. Paddles were against the thwarts just as it had been left by its former owners.

The little craft was examined and found to be quite staunch.

But just at that moment Randall gripped Frank’s arm.

“Look!” he whispered.

He pointed across the domed lake. There was a strange leaping, fantastic glare of light. It appeared at intervals and was intensely weird and fanciful in its shapes.

CHAPTER VI.
ACROSS THE LAKE.

Of course, the cupidity and curiosity of the explorers were aroused.

Not one but had a keen desire to know what the meaning of the light was. So after a few moments Randall said:

“That beats me! What is it?”