"This was cut by someone, a long time ago," Travis half whispered and then wondered why. There was no reason to believe the road makers could hear him when perhaps a thousand years or more lay between the chipping of that stone and this day.

The Tatar girl looked over her shoulder. Perhaps she too was troubled by the sense that here time was subtly telescoped, that past and present might be meeting. Or was that feeling with them both because of their enforced conditioning?

"Who?" Now her voice sank in turn.

"Listen—" he regarded her intently—"did your people or the Reds ever find any traces of the old civilization here—ruins?"

"No." She leaned forward, tracing with her own finger the same almost-obliterated marks which had intrigued Travis. "But I think they have looked. Before they discovered that we could be free, they sent out parties—to hunt, they said—but afterward they always asked many questions about the country. Only they never asked about ruins. Is that what they wished us to find? But why? Of what value are old stones piled on one another?"

"In themselves, little, save for the knowledge they may give us of the people who piled them. But for what the stones might contain—much value!"

"And how do you know what they might contain, Fox?"

"Because I have seen such treasure houses of the star men," he returned absently. To him the marks on the ledge were a pledge of greater discoveries to come. He must find where that carefully constructed road ran—to what it led. "Let us see where this will take us."

But first he gave the chittering signal in four sharp bursts. And the tawny-gray bodies came out of the tangled brush, bounding up to the ledge. Together the coyotes faced him, their attention all for his halting communication.

Ruins might lie ahead; he hoped that they did. But on another planet such ruins had twice proved to be deadly traps, and only good fortune had prevented their closing on Terran explorers. If the ape-things or any other dangerous form of life had taken up residence before them, he wanted good warning.