"I don't think there's any doubt about the Tube having gotten through. That's the Fifth Dimension planet, all right." He smiled at Evelyn. She was deathly pale. "I--remember--hearing noises like that...." Denham stood up. He painstakingly slipped on the safety of his rifle and laid it on a bench with the other guns. There was a small arsenal on a bench at one side of the laboratory. The array looked much more like arms for in expedition into dangerous territory than a normal part of apparatus for an experiment in rather abstruse mathematical physics. There were even gas masks on the bench, and some of those converted brass Very pistols now used only for discharging tear- and sternutatory-gas bombs. "The Tube wasn't seen, anyhow," said Professor Denham briskly. "Who's going through first?" Tommy slung a cartridge belt about his waist and a gas mask about his neck. "I am," he said shortly. "We'll want to camouflage the mouth of the Tube. I'll watch a bit before I get out." He crawled into the mouth of the twisted pipe. * * * * * The Tube was nearly three feet across, each section was five feet long, and there were gigantic solenoids at each end of each section. It was not an experiment made at random, nor was the world to which it reached an unknown one to Tommy or to Denham. Months before, Denham had built an instrument which would bend a ray of light into the Fifth Dimension and had found that he could fix a telescope to the device and look into a new and wholly strange cosmos.[1] He had seen tree-fern jungles and a monstrous red sun, and all the flora and fauna of a planet in the carboniferous period of development. More, by the accident of its placing he had seen the towers and the pinnacles of a city whose walls and towers seemed plated with gold. [1] "The Fifth-Dimension Catapult"--see the January, 1931, issue of Astounding Stories. Having gone so far, he had devised a catapult which literally flung objects to the surface of that incredible world. Insects, birds, and at last a cat had made the journey unharmed, and he had built a steel globe in which to attempt the journey in person. His daughter Evelyn had demanded to accompany him, and he believed it safe. The trip had been made in security, but return was another matter. A laboratory assistant, Von Holtz, had sent them into the Fifth Dimension, only to betray them. One King Jacaro, lord of Chicago racketeers, was convinced by him of the existence of the golden city of that other world, and that it was full of delectable loot. He offered a bribe past envy for the secret of Denham's apparatus. And Von Holtz had removed the apparatus for Denham's return before working the catapult to send him on his strange journey. He wanted to be free to sell full privileges of rapine and murder to Jacaro.