With a wave of his sombrero, Bud put spurs to his mount and galloped away to join his companions, who had started the herd on its way to Eureka, where the animals were to be shipped East.

Tad and Stacy were too full of surprise to express their feelings.

CHAPTER XX

VISITED BY A HALO

The Pony Rider Boys turned again to the Desert Maze. A week had elapsed since Bud Stevens and his party had left them. One evening, after a hard day in the saddle, the guide was sitting thoughtfully in his tent, when Professor Zepplin entered.

"Sit down?" asked the guide.

"For a moment only," answered the Professor.

"Weather's fine to-night."

"Yes, even though we have no water to speak of. Do you consider our situation at all serious, Mr. Parry?"