"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. Together the coyotes turned and loped along the now level way of the ledge, disappearing around a curve fitted to the mountain side while Travis and Kaydessa followed. They heard it before they saw its source--a waterfall. Probably not a large one, but high. Rounding the curve, they came into a fine mist of spray where sunlight made rainbows of color across a filmy veil of water. For a long moment they stood entranced. Kaydessa then gave a little cry, held out her hands to the purling mist and brought them to her lips again to suck the gathered moisture. Water slicked the surface of the ledge, and Travis pushed her back against the wall of the cliff. As far as he could discern, their road continued behind the out-flung curtain of water, and footing on the wet stone was treacherous. With their backs to the solid security of the wall, facing outward into the solid drape of water, they edged behind it and came out into rainbowed sunlight again. Here either provident nature or ancient art had hollowed a pocket in the stone which was filled with water. They drank. Then Travis filled his canteen while Kaydessa washed her face, holding the cold freshness of the moisture to her cheeks with both palms. She spoke, but he could not hear her through the roar. She leaned closer and raised her voice to a half shout: "This is a place of spirits! Do you not also feel their power, Fox?" Perhaps for a space out of time he did feel something. This was a watering place, perhaps a never-ceasing watering place--and to his desert-born-and-bred race all water was a spirit gift never to be taken for granted. The rainbow--the Spirit People's sacred sign--old beliefs stirred in Travis, moving him. "I feel," he said, nodding in emphasis to his agreement.