"Oh, of course--Stevens, the great Olympic high and fancy diver! I would _never_ have connected our own Doctor Stevens, the eminent mathematical physicist, with the King of the Springboard. Say, ever since I quit being afraid of the water I've had a yen to do that two-and-a-half twist of yours, but I never met anybody who knew it well enough to teach it to me, and I've almost broken my back forty times trying to learn it alone!" "I've got you, now, too--American and British Womens' golf champion. Shake!" and the two shook hands vigorously, in mutual congratulation. "Tell you what--I'll give you some pointers on diving, and you can show me how to make a golf ball behave. Next to Norman Brandon, I've got the most vicious hook in captivity--and Norm can't help himself. He's left-handed, you know, and, being a southpaw, he's naturally wild. He slices all his woods and hooks all his irons. I'm consistent, anyway--I hook everything, even my putts." "It's a bargain! What do you shoot?" "Pretty dubby. Usually in the middle eighties--none of us play much, being out in space most of the time, you know--sometimes, when my hook is going particularly well, I go up into the nineties." "We'll lick that hook," she promised, as they entered an elevator and were borne upward, toward the prow of the great interplanetary cruiser. CHAPTER II ----But Does Not Arrive "All out--we climb the rest of the way on foot," Stevens told his companion, as the elevator stopped at the uppermost passenger floor. They walked across the small circular hall and the guard on duty came to attention and saluted as they approached him. "I have orders to pass you and Miss Newton, sir. Do you know all the combinations?" "I know this good old tub better than the men that built her--I helped calculate her," Stevens replied, as he stepped up to an apparently blank wall of steel and deftly manipulated an almost invisible dial set flush with its surface. "This is to keep the passengers where they belong," he explained, as a section of the wall swung backward in a short arc and slid smoothly aside. "We will now proceed to see what makes it tick." Ladder after ladder of steel they climbed, and bulkhead after bulkhead opened at Stevens's knowing touch. At each floor the mathematician explained to the girl the operation of the machinery there automatically at work--devices for heating and cooling, devices for circulating, maintaining, and purifying the air and the water--in short, all the complex mechanism necessary for the comfort and convenience of the human cargo of the liner.