echoed uneasily in his mind long after the sound of it had died upon the twilit air. After a while he glanced back over one shoulder, half expecting to see the luminous dazzle of her body still glowing in the dim glade where he had left her; but the blurred tapestry-landscape was quite empty. He went on in the midst of a silence so deep it hurt his ears, and in a solitude unhaunted even by the shy presences of the tree-folk. They had vanished with the fire-bright girl, and the whole twilight land was empty save for himself. He plodded on across the dark grass, crushing the upturned flower-faces under his boots and asking himself wearily if he could be mad. There seemed little other explanation for this hushed and tapestried solitude that had swallowed him up. In that thunderous quiet, in that deathly solitude, he went on. When he had walked for what seemed to him much longer than it should have taken to reach his starting-point, and still no sign of an exit appeared, he began to wonder if there were any way out of the gray land of Thag. For the first time he realized that he had come through no tangible gateway. He had only stepped out of a shadow, and—now that he thought of it—there were no shadows here. The grayness swallowed everything up, leaving the landscape oddly flat, like a badly drawn picture. He looked about helplessly, quite lost now and not sure in what direction he should be facing, for there was nothing here by which to know directions. The trees and shrubs and the starry grass still stretched about him, uncertainly outlined in that changeless dusk. They seemed to go on for ever. But he plodded ahead, unwilling to stop because of a queer tension in the air, somehow as if all the blurred trees and shrubs were waiting in breathless anticipation, centering upon his stumbling figure. But all trace of animate life had vanished with the disappearance of the priestess' white-glowing figure. Head down, paying little heed to where he was going, he went on over the flowery sward. An odd sense of voids about him startled Smith at last out of his lethargic plodding. He lifted his head. He stood just at the edge of a line of trees, dim and indistinct in the unchanging twilight. Beyond them—he came to himself with a jerk and stared incredulously. Beyond them the grass ran down to nothingness, merging by imperceptible degrees into a streaked and arching void—not the sort of emptiness into which a material body could fall, but a solid nothing, curving up toward the dark zenith as the inside of a sphere