Cochrane nodded. But just as he and Babs had never been conditioned to be afraid of animals, they had been conditioned by air-travel at home and space-travel to here against alarm at movements of their surroundings. Temblors were evidently frequent at this place. Trees were anchored against them as against prevailing winds in exposed situations. Landslides did not remain poised to fall. Really unstable slopes had been shaken down long ago. "I wish we had a helicopter," Cochrane repeated. "The look of the mountains as we came down, with glaciers between the smoking cones--that was good show-stuff! We could have held interest here until we worked that naming contest. We could use the extra capital that would bring in! As it is, we've got to move on with practically nothing accomplished. The trouble is that I didn't think we would succeed as we have! Heaven knows I could have gotten helicopters!" He helped her up a small steep incline, where rock protruded from a hillside. The ground trembled again. Not alarmingly, but Babs' hold of his hand tightened a little. They continued to climb. They came out atop a small bare prominence which rose above the forest. Here they could see over the treetops in a truly extensive view. The mountains all about were clearly visible. Some were ten and some twenty miles away. Some, still farther, were barely visible in the thin haze of distance. But there was a thick pall of smoke hovering about one of the farthest. It was mushroom-shaped. At one time in human history, it would have seemed typically a volcanic cloud. To Cochrane and Babs, it was typically the cloud of an atomic explosion. The ground shook sharply underfoot. Babs staggered. Flying things rose from the forests in swarms. They hovered and darted and flapped above the tree-tops. Temblors did not alarm the creatures of the valley. But ground-shocks like this last were another matter. A great tree, rearing above its fellows, toppled slowly. With ripping, tearing noises, it bent sedately toward the smoking, far-away mountain. It crashed thunderously down upon smaller trees. There were other rending noises. The flying things rose higher, seeming agitated. Echoes sounded in the ears of the two atop the hill. There was another sharp shock. Babs gave a little, inarticulate cry. She pointed. There was much smoke in the distance. Over the far-away cone, which was indistinct in the smoke of its own making--over the edge of the distant mountains a glare appeared. It was a thin line of bright white light. With infinite deliberation it began to creep down the slanting, blessedly remote mountainside.