Still Hal Sinclair could sing softly to his horse and to himself; and, though his companions cursed his singing, they blessed him for it in their hearts. Otherwise the white, listening silence of the desert would have crushed them; otherwise the lure of the mountains would have maddened them and made them push on until the horses would have died within five miles of the labor; otherwise the pain in their slowly swelling throats would have taken their reason. For thirst in the desert carries the pangs of several deaths—death from fire, suffocation, and insanity.

No wonder the three scowled at Hal Sinclair when he drew his revolver.

"My horse is gun-shy," he said, "but I'll bet the rest of you I can drill a horn off that skull before you do."

Of course it was a foolish challenge. Lowrie was the gun expert of the party. Indeed he had reached that dangerous point of efficiency with firearms where a man is apt to reach for his gun to decide an argument. Now Lowrie followed the direction of Sinclair's gesture. It was the skull of a steer, with enormous branching horns. The rest of the skeleton was sinking into the sands.

"Don't talk fool talk," said Lowrie. "Save your wind and your ammunition. You may need 'em for yourself, son!"

That grim suggestion made Sandersen and Quade shudder. But a grin spread on the broad, ugly face of Lowrie, and Sinclair merely shrugged his shoulders.

"I'll try you for a dollar."

"Nope."

"Five dollars?"

"Nope."