direction."

nder another day's sun the hot asphalt was again taking the print of the tires of Rawson's old car. But this time, when he came to the almost obliterated marks that led through the sand toward distant mountains, he stopped, partially deflated the tires to give them a grip on the sand, and swung off.

"A fool, kid trick," he admitted to himself, "but I want to see the place. I'll see plenty of it before I'm through, but right now I've got to have a look; then I'll buckle down to work.

"Thermal Explorations, Limited!" The name rang triumphantly in his mind. "A million things to do—men, crews for the drills, derricks.... We'll have to truck in over this road; I'll lay a plank road over the sand. And water—we'll have to haul that, too, until we can sink a well. We'll find water under there somewhere. I've got to see the place...."

The black sides of the mountains were nearer: every outcropping rock was plainly volcanic, and great sweeping slopes were beds of ash and pumice; the wheel marks, where they showed at all, wound off and into a canyon hidden in the tremendous hills that thrust themselves abruptly from the desert floor.

The mountains themselves towered hugely at closer range, but the road that Rawson followed climbed through them without traversing the highest slopes. It was scarcely more than a trail, barely wide enough for the car at times, but boulder-filled gullies showed where the hands of men had worked to build it.

e came at last into the open where a shoulder of rock bent the road outward above a sea of sand far below. And now the mountains showed their circular arrangement—a great ring, twenty miles across. At one side were three conical peaks, unmistakable craters, whose scarred sides were smothered under ash and sand that had rained down from their shattered tops in ages past. Yet, so hot they were, so clear-cut the irregularly rimmed cups at their tops, that they seemed to have pushed themselves up through the earth in that very instant. At their bases were signs of human habitation—broken walls, scattered stone buildings whose empty windows gaped blackly. This was all that remained of New Rhyolite.

Rawson looked at the "ghost town" which had never failed to interest him, but he gave no thought now to the hardy prospectors who had built it or to the vein of gold that had failed them. His searching eyes came back to the fiery pit, the Tonah Basin, a vast cauldron of sand and ash—great sweeps of yellow and gray and darker brown into which the sun was pouring its rays with burning-glass fierceness.

But to Rawson, there was more than the eye could see. He was picturing a great powerhouse, steel derricks, capped pipes that led off to whirring turbines, generators, strings of cables stretching out on steel supports into the distance, a wireless transmitter—and all of this the result of his own vision, of the stream he would bring from deep in the earth!

Then, abruptly, the pictures faded. Far below him on the yellow, sun-blasted floor, a fleck of shadow had moved. It appeared suddenly from the sand, moved erratically, staggeringly, for a hundred feet, then vanished as if something had blotted it out—and Dean Rawson knew that it was the shadow of a man.

he road widened beyond the turn. He had intended to swing around; he had wanted only to take a clear picture of the place with him. But now the big car's gears wailed as he took the downgrade in second, and the brakes, jammed on at the sharp curves, added their voice to the chorus of haste.

"Confounded desert rats!" Rawson was saying under his breath. "They'll chance anything—but imagine crossing country like that! And he hasn't a burro—he's got only the water he can carry in a canteen!"

But even the canteen was empty, he found, when he stopped the car in a whirl of loose sand beside a prone figure whose khaki clothes were almost indistinguishable against the desert soil.

Before Rawson could get his own lanky six feet of wiry length from the car, the man had struggled to his feet. Again the little blot of shadow began its wavering, uncertain, forward movement.

He was a little shorter than Rawson, a little heavier of build, and younger by a year or two, although his flushed face and a two days' stubble of black beard might have been misleading. Rawson caught the staggering man and half carried him to the shadow of the car, the only shelter in that whole vast cauldron of the sun.

From a mouth where a swollen tongue protruded thickly came an agonized sound that was a cry for, "Water—water!" Rawson gave it to him as rapidly as he dared, until he allowed the man to drink from the desert bag at the last. And his keen eyes were taking in all the significant details as he worked.

The khaki clothes earned a nod of silent approval. The compact roll that had been slung from the younger man's shoulders, even the broad shoulders themselves, and the square jaw, unshaved and grimy, got Rawson's inaudible, "O. K.!" But the face was more burned than tanned.

e introduced himself when the stranger was able to stand. "I'm Rawson, Dean Rawson, mining engineer when I'm working at it," he explained. "I'm bound north. I'll take you out of this. You can travel with me as far as you please."

The dark-haired youngster was plainly youthful now, as he stood erect. His voice was recovering what must have been its usual hearty ring.

"I'm not trying to say 'thank you,'" he said, as he took Rawson's hand. "I was sure sunk—going down for the last time—taps—all that sort of thing! You pulled me out—the good old helping hand. Can't thank a fellow for that—just return the favor or pass it on to someone else. And, by the way—you won't believe it—but my name is Smith."

Rawson smiled good-naturedly. "No," he agreed, "I don't believe it. But it's a good, handy name. All right, Smithy, jump in! Here, let me give you a lift; you're still woozy."

Rawson found his passenger uncommunicative. Not but what Smithy talked freely of everything but himself, but it was of himself that Rawson wanted to know.

"Drop me at the first town," said Smithy. "You're going north: I'm south-bound—looking for a job down in Los. I won't take any more short cuts; I was two days on this last one. I'll stick to the road."

They were through the mountains that ringed in the fiery pit of Tonah Basin. Smooth sand lay ahead; only the shallow marks that his own tires had ploughed needed to be followed. Dean Rawson turned and looked with fair appraisal at the man he had saved.

"Drifter?" he asked himself silently. "Road bum? He doesn't look the part; there's something about him...."

Aloud he inquired: "What's your line? What do you know?"

And the young man answered frankly: "Not a thing!"

ean sensed failure, inefficiency. He resented it in this youngster who had fought so gamely with death. His voice was harsh with a curious sense of his own disappointment as he asked:

"Found the going too hard for you up north, did you? Well, it won't be any easier—" But Smithy had interrupted with a weak movement of his hand.

"Not too hard," he said laconically;