It was a bowlder nearly as large as the Very Young Man himself, but the gigantic reptile shook it off, writhing and twisting for an instant, and hurling the smaller loose rocks about the floor of the gully with its struggles. The Very Young Man cast about for another missile, but there were none at hand. Aura, at the confusion, had stopped about two hundred feet away. "Run!" shouted the Very Young Man. "Hide somewhere! Run!" The lizard, momentarily stunned, recovered swiftly. Again it started forward, seemingly now as alert as before. And then, without warning, in the air above his head the Very Young Man heard the rush of gigantic wings. A tremendous grey body swooped past him and into the gully--a bird larger in proportion than the lizard itself.... It was the little sparrow the Chemist had sent in from the outside world--maddened now by thirst and hunger, which to the reptile had been much more endurable. The Very Young Man, shouting again to Aura to run, stood awestruck, watching the titanic struggle that was raging below him. The great lizard rose high on its forelegs to meet this enemy. Its tremendous jaws opened--and snapped closed; but the bird avoided them. Its huge claws gripped the reptile's back; its flapping wings spread the sixty foot width of the gully as it strove to raise its prey into the air. The roaring of these enormous wings was deafening; the wind from them as they came up tore past the Very Young Man in violent gusts; and as they went down, the suction of air almost swept him over the brink of the precipice. He flung himself prone, clinging desperately to hold his position. The lizard threshed and squirmed. A swish of its enormous tail struck the gully wall and brought down an avalanche of loose, golden rock. But the giant bird held its grip; its bill--so large that the Very Young Man's body could easily have lain within it--pecked ferociously at the lizard's head. It was a struggle to the death--an unequal struggle, though it raged for many minutes with an uncanny fury. At last, dragging its adversary to where the gully was wider, the bird flapped its wings with freedom of movement and laboriously rose into the air. And a moment later the Very Young Man, looking upward, saw through the magic diminishing glass of distance, a little sparrow of his own world, with a tiny, helpless lizard struggling in its grasp. * * * * * "Aura! Don't cry, Aura! Gosh, I don't want you to cry--everything's all right now." The Very Young Man sat awkwardly beside the frightened girl, who, overcome by the strain of what she had been through, was crying silently. It was strange to see Aura crying; she had always been such a Spartan, so different from any other girl he had ever known. It confused him.