A slender cable dangled before them, and at its lower end they saw a basket-like car which their guide bid them enter. When they had done so, he tugged on the cable, giving a rapid twitching signal. Instantly they were soaring up into the blackness above the lights of Antrid. * * * * * The swift journey ended in a tiny enclosed vehicle where another Rulan operated the cable drum which had made the trip possible. The car was unlighted save for the faint glow of a hand lamp, and it was not until the lower door was closed that they were permitted a view of the interior of the strange vehicle and had a good look at the two Rulans. "Now," the one who had brought them said, "I can explain. I am Tiedus, son of Tiedor. My companion is Dantus, son of Dantor, the greatest scientist in all Antrid. We are taking you to Dantor who has knowledge of the mad plans of the Llotta and is in need of your help in thwarting them. You are willing?" "Why--why, yes," Blaine stammered, looking deep into the earnest eyes of Tiedus. "You--you know of the fate of Tiedor?" "I do." The young Rulan fell silent; then shook his head as if to clear it of unwelcome thoughts. "There are but few of us left, oh Earth man," he said then, "and all expect a like fate sooner or later. But that is beside the point. We have important work to do: work that brooks no delay. We leave now for the Tritu Anu, with your consent." Tom Farley was examining the machinery of the car with interest. "This one of the monorail cars?" he inquired, when Dantus had seated himself at the controls. "Indeed not. The Llotta do not even know of the existence of this vehicle. We could not get right of way on the rails, so this gravity car was developed in secrecy. It is provided with variable repulsion energies that can be adjusted to keep it at a fixed distance from the inner surface of the copper shell. Thus it misses cross beams and braces. It is drawn forward by similar energies, or more exactly, by the component of a number of attracting forces. We do not display lights, so are thus comparatively safe from discovery. They'll catch us sooner or later, though, of course." Dantus indulged in a fatalistic shrug of his shoulders as he concluded. * * * * * At his manipulation of a number of tiny levers that were set into the control panels like the stops of an organ, the car lurched forward. Silently, swiftly, they sped on through the gloom under the great copper shell. Through the viewing glass of a periscope arrangement that let no betraying light escape to the outside, they watched the endless lines of illuminating globes slip by beneath them. Weirdly vast and shadowy in the upper reaches, the latticed supporting columns on either side merged into continuous semi-transparent walls as the car gathered speed.