HE FELT SOLID GROUND under his feet, and his eyes, snapping open, saw an alien land. It was a land of somber color, with great gray moors, and beetling black cliffs. There was something queer about it, an intangible quality that baffled him. He looked about him, expecting to see his companions. He saw no one. He was absolutely alone in that desolate brooding land. Something dreadful had happened! Was he the only one to be safely transported from the third dimension? Had some horrible accident occurred? Was he alone? Sudden panic seized him. If something had happened, if the others were not here, might it not be possible that the machine would not be able to bring him back to his own dimension? Was he doomed to remain marooned forever in this terrible plane? He looked down at his body an