And like an immortal, living ether, Jonathan Morgan sped onward and outward into that space. Black meteors went through him and harmed him not. Somehow he found himself aware of them, knowing that they only pushed the gaseous components of his form aside; that when they had passed, his body resumed its former shape. He did know that they could not hurt him; but why, he was unaware. The infinitely tiny motes of matter that were Jonathan Morgan swelled and grew and expanded. He fled upward and downward with the speed of thought. He grew and towered, and the Earth dropped away below the mad onrush of this strange, galactic giant. He passed Mars swiftly, casting a curious glance at its canals, seeing half-buried cities beneath ancient sea-bottoms. Beyond the asteroid belt he found frozen Jupiter, and Saturn with its ring, and saw strange forms of life that eked out existences on icy worlds. In a moment he passed over Pluto and the dark planet beyond it. There was life here, too, of a queer, alien sort. Not flesh, but another form of matter. He thought idly that he would like to study it, but he had not the time. For the call that had been vague on Earth was now grown peremptory, summoning. In answer to that call, he fled onward in a rush of gas that seemed to whisper as it sped through the cold voids of space. In short seconds he was beyond the outermost limits of Sol's domain, ever expanding.... Proxima, nearest star to Sol, glowed brilliant in his path. Beyond it he could see Alpha Centauri, huge and bright. The other stars, too, he recognized. For he was out among the star trails now, and Sol was a dot behind him. And ever as he flew onward, always as his height grew and grew until he straddled a thousand worlds, the call came clearer. He _knew_ now that he had been summoned from the Earth; knew that ahead of him was an intelligence demanding his presence. [Illustration: _They knew they had been summoned, that far ahead something demanded their presence._] Insanely he flung himself out and up, searching the odd and sometimes terrible worlds that flitted past his eyes. Alien life, spawning on planets so far from Earth that they were undreamed, lived and died beneath his gaze as he shot by. The call came clarion clear, at last. * * * * * It said: "Creature of the Third Planet of the sun named Sol. Heed me. You have done well to find me, very well. Turn your gaze this way, Earthling. A little further. Yes, right there. "The pale yellow planet. You see it? Then hasten, join us. For we have need of every aid that the universe contains. Hurry, Earthling!" He swirled downward toward the atmospheric belt of the amber orb that swung lazily about a double sun. Even as he compressed his body together, he caught a flicker of queer black lights off to one side in the corners of his eyes. They quivered and throbbed, and almost touched the yellow planet.