Relativity deals with solid bodies moving at definite velocities which cannot exceed that of light, but in wave mechanics the particle becomes a weird and shadowy psi function and is only probably where it is. In the latter theory, point-to-point transitions are not velocities but shifts in the node of a complex wave. It turned out that the electronic wave velocity--which, unlike the group velocity, is not limited by the speed of light--could be imparted to matter under the right conditions, so that the most probable position of the electron went from point to point at a bewildering rate. The trick was to create the right conditions. "A field of nuclear space-strain is set up by the circuit, and the ship, reacting against the entire mass of the universe, moves without need of rockets--right?" asked the Earthman. "Wrong," said Urushkidan. "Well, we'll build it anyway," said Ray. "Here, Dyann, bring that generator over this way, will you?" "I vant to go monster-huntin," she sulked. "Bring--it--over, you lummox!" Dyann glared, but stooped over the massive machine and, between Ganymedean gravity and Varannian muscles, staggered across the floor with it. Ray was checking circuits on the oscilloscope. Urushkidan sat grumbling about heat and humidity and fanning himself with his ears. The lab was a mess of tubes, condensers, rheostats, and tangled wire. "I'm stuck," wailed Ray. "I need a resistor having so and so many ohms along with such-and-such a capacitance. Find me one, quick." "If you would specify your units more precisely--" began Urushkidan huffily. Ray pawed through the litter on the floor, putting one object after another into his testing circuit, glancing at the meters, and throwing it across the room. "It's vital," he said. "Vill this do, maybe?" asked Dyann innocently, holding out the ship's one and only frying pan. "Get out!" screamed Ray. "I go monster-huntin," she pouted. Absent-mindedly, Ray tested the frying pan. It was nearly right. By Luna, if he sawed off the handle-- "Hey!" yelped Urushkidan. "I don't like the thought of eating cold beans, cold canned meat, and raw eggs any better than you," said Ray. "But damn it, we've got to get out of here." He soldered the emasculated pan into his circuit. "Starward the course of human empire," he muttered viciously. "Martian empire," corrected Urushkidan. "It'll be Jovian empire if we don't clear out of here. Okay, big brain, what comes next?" "How should I know? How can you expect me to tink in tis foul tick air, and witout tobacco?" Urushkidan turned his back. Dyann clumped in, spacesuited, sword in one hand and rifle in the other. "I saw monsters out there," she said. "I'm goin out to kill them." "Oh, yeah, sure," muttered Ray without looking up from his slide rule. "Urushkidan, you've got to calculate the resonant psi function for me." "Won't," said the Martian. "By Heaven, you snake-legged bagpipe, I'm the captain here and you'll do as I say."