Hoo, bang, away over the hills with the moonscape blurring in speed. Wind shrieked thinly about Dyann's helmet. She bounced off her seat and came down again, a landslide rumbled behind her. The dragon zoomed up the ridge, leaped from a bluff, and started across the cratered plain beyond. Dyann dragged at the horn, turning its head, fighting the monster into a circular stampede. "Ha, Ormun!" she yelled. "Ha, Kathantuma!" In an hour or so the dragon stopped and stood gasping. Dyann slid stiffly to the ground, whirled her sword over her head, and decapitated the monster. Then she skipped home, laughing. "Dyann!" cried Ray as she came through the airlock. "Dyann, we thought you were dead--" "Oh, it vas fun," she grinned. "Fix me a sandvich." She sat down, got up rather quickly, and opened her arms to Ray. He retreated nervously toward the lab. Urushkidan snickered and slammed the door in his face. V The eighty-six hour day of Ganymede drew to a close. Jupiter was at the half now, a banded amber giant in a sky of thronging wintry stars. Ray wiped his grimy hands and sighed. "Done," he said, looking fondly at the haywired mess filling half the lab and reaching back toward the engines. "We've done it--we've conquered the stars." "My little Earthlin is so clever," simpered Dyann. "I am horribly afraid," said Urushkidan, "tat tis minor achievement of mine will eclipse my true accomplishments in te popular mind. Oh, well." He shrugged. "I can always use te money." "Umm, yeah, I never thought of that," said Ray. "I'm safe enough from Vanbrugh now--you don't arrest the man who's given Earth the Galaxy--but by gosh, there's a fortune in this little gadget too." "For me, of course, when I have patented it," said Urushkidan. "What?" yelped Ray. "You--" "Certainly. I inbented it, didn't I? I shall patent it too. Tell me, should I charge an exorbitant royalty or would tere be more money in mass sales at small price?" "Look here," snarled Ray, "I happen to know how this thing is put together too." "Do you?" grinned Urushkidan nastily. "Uh--" Ray looked at the jungle of apparatus and gulped. He had only a few fragmentary drawings. By Einstein, he had no idea how the damned thing worked. "But we helped you," he protested feebly. "When you pay your mules and cows, I may consider gibing you a small percentage," said Urushkidan loftily. "You've already got more money than you know what to do with, you bloated capitalist. I happen to know you invested your Nobel Prize in mortgages and then foreclosed." "And why not? When te royalties on tis engine start coming in, and I get my second Nobel Prise, maybe ten I can afford an occasional cigar. You Earthlings neber reward genius. All tese years I'be had to smoke tat foul pipe--And tat reminds me, we habe to test tis machine. Where is te nearest tobaco store?"