My attention wandered to the vaster scene spread before us. The milk-white radiance illumined the distance. Beyond the path and the small courtyards there was a sudden drop, a thousand feet perhaps--a void here, all at that lower level. The cliff wall, to which the gate-house clung, went down that thousand feet--and up out of sight overhead. And stretched off in the milky distance. Smooth, black and sheer. But there were lines marking it into great rectangles; giant blocks of metal out of which it was built. Not a cliff, but a titanic dam! I could see only this end of it--twenty miles of it possibly. At about the level of the gate-house, the water was surging through it, in a tremendous horizontal gash. It stretched off and lost itself in the blur of distance. And through the gash the wall of water was arching out and falling a thousand feet. Uncounted Niagaras! A million? I could fancy so. A million Niagaras, piled one upon the other for a thousand feet of height; laid end to end for hundreds of miles. An utterly inconceivable torrent, falling a thousand feet into a white sea of foam down below--a boiling, lashing sea hundreds of miles wide, leaping and tumbling away into other cañons. White-lashed water, catching what little light was here, reflecting it as a milky radiance. There was wind here, its roar mingling with the greater roar unnoticed. Wind whirling and plucking at us. Spray, even up here. Giant spirals of upflung mist. The salt tang of the sea-spume whipped and sucked and flung by the wind. * * * * * We stood only a moment. No Gians were here. Why would there be? This water could not surge through that wall for very long without tearing it away. Inconceivable torrent! But it was a mere slit in the wall--the dribble of a child’s spillway on the shore of a sea. Our great oceans were up there--pressing to get down. What Gian would stay here on guard, with all his fellows escaping to safety? We crept cautiously down the path. The wind whirled us; the spray, suddenly leaping in some chance gust, drenched us. I clung to Tad. Entt I could not see. I felt a sudden mild electric shock from Tad’s robe. He cried out involuntarily; became visible so that I saw him beside me. His hands tore at his hood; his startled white face appeared. Then he grinned. “Ruined! It’s off, Jeff. You can see me, can’t you?” The water had evidently short-circuited his robe. And in a moment mine went the same. Entt cut out his current. We flung back our hoods and took off our gloves. The freedom of it was pleasant, but we were no longer invisible. “What of it?” said Tad. “There isn’t any one here.” We came to the low door in the first wall. It opened to our touch. The courtyard was empty.