CHAPTER XIX
Searching for the Ancient

“NOT a lake,” said Fekmah, shaking his head. “Only another mirage. They are rather common all through this region, and we may see much more short time.”

“Well, if there was a real lake there beside that mirage, I wouldn’t know which to pick,” confessed Joe. “And look! Even waves are there. And foam caps!”

“Wonderful facsimile, all right,” remarked Dr. Kirshner. “Old Nature is capable of playing mighty big jokes on us sometimes.”

For over a half-hour the illusion was visible to the explorers; then, when they rounded a large pile of rocks, it could no longer be seen.

“And I’m glad,” said Bob. “Now maybe I can get my mind away from thinking only of water. It wasn’t very pleasant to see what looked like it and not be able to have it.”

“When do we come to another oasis?” inquired Joe of Fekmah.

“Tishmak say within next fifty miles,” was the response. “It be very small, but there be much water to drink.”