Lur put out a front paw to test the slag but withdrew it instantly.

"It cooks the flesh, we can not walk here," was his verdict.

Varta pointed with her chin to the left where, some distance away, the mountain wall paralleled their course.

"Then let us keep to the jungle over there and see if it does not bring around to the far side. But what made this—?" She leaned out over the glassy stuff, not daring to touch the slick surface.

"War." Lur's tongue shot out to impale a questing beetle. "These forgotten people fought with fearsome weapons."

"But what weapon could do this? Memphir knew not such—."

"Memphir was old. But mayhap there were those who raised cities on Erb before the first hut of Memphir squatted on tidal mud. Men forget knowledge in time. Even in Memphir the lords of the last days forgot the wisdom of their earlier sages—they fell before the barbarians easily enough."

"If ever men had wisdom to produce this—it was not of Asti's giving," she edged away from the glare. "Let us go."

But now they had to fight their way through jungle and it was hard—until they reached a ridge of rock running out from the mountain as a tongue thrust into the blasted valley. And along this they picked their slow way.

"There is water near—," Lur's thought answered the girl's desire. She licked dry lips longingly. "This way—," her companion's sudden turn was to the left and Varta was quick to follow him down a slide of rock.