"Prospecting?" questioned Tad.

"Taking my morning constitutional. Going to be hot enough to singe the pin feathers off a bald-headed sage hen to-day," he informed them, slipping from his saddle. After beating a cloud of alkali dust from his clothes he joined the party at the breakfast table.

"Find any?" asked Tad, eyeing him inquiringly, for Tad had an idea as to the object of the guide's early morning ride.

"Nary," was the comprehensive reply. "Have to take a dry shampoo to-day, I reckon."

"I suppose there is no water in sight yet?" asked the Professor, he not having caught the meaning of the brief dialogue between Tad and Tom Parry.

"No, sir. Not yet. We'll be moving as soon as possible after breakfast. Better use sparingly what little water you have left in your canteens. You may need it before we strike another water hole," he advised.

As usual, however, the spirits of the Pony Rider Boys were in no way affected by the shortage of water. Time enough to worry when their canteens were dry. These days, Tad and Stacy were occupying all their spare time in working with the two stallions they had captured. The Angel, under Tad's kind but determined training, was advancing rapidly and already had been taught to do a few simple tricks. Stacy, on his part, was not doing quite so well with Satan. The latter, like his namesake, was inclined to be vicious, biting and kicking whenever the evil spirit moved.

Ahead, on all sides of them as the sun rose that morning, lay wide stretches of gray, dusty soil, blotches of alkali alternating with huge patches of scattering sage brush, with no living thing in sight.

Overhead burned the blue of a cloudless sky; about them the suffocating atmosphere of the alkali desert.

It was not a cheerful vista that spread out before the lads. The ponies, suffering for want of water, took up the day's journey with evident reluctance. With heads hanging low they dragged themselves along wearily, half in protest, now and then evincing a sudden desire to turn about and head for the mountains.