them lined up as if on a highway which had come to an end in an ice barrier now melted away.

The vehicles were partly or wholly covered with water-borne clay which had been laid upon them by just such meltings of the ice-cap. They ran on into a small hillock which had formed since they had come to a stop at this place. Some were merely hummocks of clay-covered metal, barely showing above the ground. Some were what could be called only hub-deep in the clay. But it was being buried in the clay which had preserved them.

"You see, sir," Jerry explained, "I got the creatures to help me dig down to the doors, so I got into all that show. For weapons."

But Borden did not compliment him, though a compliment was due. Instead, Borden said in a toneless voice:

"I also see that Sattell has been here. He must have trailed you. He saw where you had driven one vehicle away. So he dug out the tracks of another one—there!—and tried it. And it worked. Sattell is gone."

It was true. Jerry, stricken, drove over to the new deep gouges in the earth which showed plainly where a way had been dug to take out another gold-metal vehicle on its wheel-like treads, and that it had been backed from where it had been almost buried.

Bones on the ground showed where Sattell had savagely flung the pitiful relics of the original owners of the car. The prints of his boots were plain in the loosened dirt.

"We've got to chase him?" Ellen asked apprehensively.

"He has the star maps and the log," Borden said tonelessly. "Or else he knows where he hid them."

"But where would he go?" persisted Ellen.

"He knows we're after him," said Borden. "He knows we're armed, and I doubt that he is, except for his bow and arrow. Where would he go for help, except to the place where we have enemies?"

The track of the other vehicle was clear. There had been no feet heavier than those of Jerry's biped friends on any of this ground for many, many years. There was a deep furrow where the other ground car, the one Sattell had taken, had rolled away.

Jerry put on speed.

Borden said, "I'll watch how you drive this thing, Jerry, and relieve you presently. Sattell 

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