Produced by Greg Weeks, Stephen Blundell and the Online Distributed Proofreading Team at https://www.pgdp.net _Five millenniums have passed since the loathsome Termans were eliminated from the world of Diskra.... But what of the other planets?_ WALLS OF ACID _BY HENRY HASSE_ Braanol stirred, throbbed sluggishly once, then lay quiescent as his mental self surged up from the deeps of non-entity. And gradually he came to know that someone had entered the room. His _room_, far beneath the city. Now he could feel the vibra-currents through the liquids of the huge tanks where he had lain somnolent for untold aeons. It was pleasant, caressing. For a moment he floated there, enjoying to the utmost this strange sensation as the renewed thought-life-force set his every convolution to pulsing. "To be once more aware! O gloriously aware!" the thought came fierce and vibrant. "Once more they have wakened me--but how long has it been?" Then curiously: "And what can they want this time?" The huge brain was alert now, with a supernal sense of keening. Tentatively he sent out a thought-potential that encompassed the room. "They are afraid!" he sensed. "Two have entered here, and they are afraid of me. I shall remedy that!" Braanol lowered his thought-potential to one-eighth of one magnitude, and felt his mind contact theirs. "Approach, my children," he said kindly. "You have nothing to fear from me! I take it you are the imperial messengers sent by her Supreme Magnificence, the Empress Alaazar?" He felt the fright slip from their minds. But they were startled. "The Empress Uldulla reigns now, fourth in the Royal line," came the thought. "Empress Alaazar died long ago!" "I am truly grieved!" Braanol flashed to them. "Alaazar--may she rest in peace--did not neglect me! How well I remember her interest in the stories I could tell, stories of the Diskra of old when we sent men out to glorious adventures on the other planets! Aye! Five millenniums ago it was that we achieved space travel. In those days--" Braanol ceased in his reminiscences, aware that these two were trying to get their thoughts through to him. "That is why we have come! The Empress Uldulla, too, wishes a story. The story of the first space-flight from Diskra, and the events that brought it about. And of how you--" "Aye! Of how _I_ came to be as you see me now! I shall be delighted, my children, to tell it again. But first, prepare the trans-telector so that it may be recorded faithfully." Braanol directed them to a machine on the far side of the room, and instructed them as to its operation. Soon the hundreds of tiny coils were humming, and a maze of tubes fed out of the machine, on which would be recorded Braanol's every thought. For a moment he paused, gently swaying, pulsing, a huge independent brain suspended in the pale green liquid. Then he began his story. * * * * *