Bruce figured-at one-sixth gravity that meant fifty pounds weight including himself, his suit, and his pack. "I'll carry my full share," he objected.

"We'll decide what's best for you," the Scoutmaster snapped. "Hurry up; the troop is ready." He left.

Sam switched off his radio and touched helmets. "Forget it," he said quietly. "The Old Man is edgy at the start of a hike." They loaded Bruce rapidly-reserve air and water bottles, a carton of grub, short, wide skis and ski poles-then hung him with field gear, first-aid kit, prospector's hammer, two climbing ropes, a pouch of pitons and snap rings, flashlight, knife. The Moon Scouts loaded up; Sam called, "Come Mr. Andrews handed the lockmaster a list and stepped inside; the three Scouts followed. Bruce felt his suit expand as the air sucked back into the underground city. A light blinked green; Mr. Andrews opened the outer door and Bruce stared across the airless lunar plain.

It dazzled him. The plain was bright under a blazing Sun. The distant needle-sharp hills seemed painted in colors too flat and harsh. He looked at the sky to rest his eyes.

It made him dizzy. He had never seen a whole skyful of stars undimmed by air. The sky was blacker than black, crowded with hard, diamond lights.

"Route march!" the Scoutmaster's voice rang in his helmet. "Heel and toe. Jack Wills out as pathfinder." A boy left the group in long, floating strides, fifteen feet at a bound. He stopped a hundred yards ahead; the troop formed single column fifty yards behind him. The Pathfinder raised his arm, swung it down, and the troop moved out.

Mr. Andrews and a Scout joined Sam and Bruce. "Speedy will help you," he told Sam, "until Bruce gets his legs. Move him along. We can't heel-and-toe and still make our mileage."

"We'll move him."

"Even if we have to carry him," added Speedy.

The Scoutmaster overtook the troop in long leaps. Bruce wanted to follow. It looked easy-like flying.

He had not liked the crack about carrying him. But Sam grasped him by his left belt grip while Speedy seized the one on his right. "Here we go," Sam warned. "Feet on the ground and try to swing in with us."

Bruce started off confidently. He felt that three days of low gravity in the corridors of Luna City had given him his "legs"; being taught to walk, like a baby, was just hazing.

Nothing to it-he was light as a bird! True, it was hard to keep heel-and-toe; he wanted to float. He gained speed on a downgrade; suddenly the ground was not there when he reached for it. He threw up his hands.

He hung head down on his belt and could hear his guides laughing. "Wha' happened?" he demanded, as they righted him.

"Keep your feet on the ground."

"I know what you're up against," added Speedy, "I've been to Earth. Your ma.s.s and weight don't match and your muscles aren't used to it. You weigh what a baby weighs, Earth-side, but you've got the momentum of a fat man."

Bruce tried again. Some stops and turns showed him what Speedy meant. His pack felt like feathers, but unless he banked his turns, it would throw him, even at a walk. It did throw him, several times, before his legs learned.

Presently, Sam asked, "Think you're ready for a slow lope?"

"I guess so."

"Okay-but remember, if you want to turn, you've got to slow down first-or you'll roll like a hoop.

Okay, Speedy. An eight-miler."

Bruce tried to match their swing. Long, floating strides, like flying. It was flying! Up! . . . float . . .

brush the ground with your foot and up again. It was better than skating or skiing.

"Wups!" Sam steadied him. "Get your feet out in front."

As they swung past, Mr. Andrews gave orders for a matching lope.

The unreal hills had moved closer; Bruce felt as if he had been flying all his life. "Sam," he said, "do you suppose I can get along by myself?"

"Shouldn't wonder. We let go a couple o' miles back."

"Huh?" It was true; Bruce began to feel like a Moon hand.

Somewhat later a boy's voice called "Heel and toe!"

The troop dropped into a walk. The pathfinder stood on a rise ahead, holding his skis up~ The troop halted and unlashed skis. Ahead was a wide basin filled with soft, powdery stuff.

Bruce turned to Sam, and for the first time looked back to the west. "Jee .. . miny Crickets!" he breathed.

Earth hung over the distant roof of Luna City, in half phase. It was round and green and beautiful, larger than the harvest Moon and unmeasurably more lovely in forest greens, desert browns and glare white of cloud.

Sam glanced at it. "Fifteen o'clock."

Bruce tried to read the time but was stumped by the fact that the sunrise line ran mostly across ocean. He questioned Sam. "Huh? See that bright dot on the dark side? That's Honolulu-figure from there."

Bruce mulled this over while binding his skis, then stood up and turned around, without tripping.

"Hmmm-" said Sam, "you're used to skis."

"Got my badge."

"Well, this is different. Just shuffle along and try to keep your feet."

Bruce resolved to stay on his feet if it killed him. He let a handful of the soft stuff trickle through his glove. It was light and flaky, hardly packed at all. He wondered what had caused it.

Mr. Andrews sent Speedy out to blaze trail; Sam and Bruce joined the column. Bruce was hard put to keep up. The loose soil flew to left and right, settling so slowly in the weak gravity that it seemed to float in air-yet a ski pole, swung through such a cloud, cut a knife-sharp hole without swirling it.

The column swung wide to the left, then back again. Off to the right was a circular depression perhaps fifty yards across; Bruce could not see the bottom. He paused, intending to question Sam; the Scoutmaster's voice prodded him. "Bruce! Keep moving!"

Much later Speedy's voice called out, "Hard ground!" Shortly the column reached it and stopped to remove skis. Bruce switched off his radio and touched his helmet to Sam's.

"What was that back where the Skipper yelled at me?"

"That? That was a morning glory. They're poison!"

"A 'morning glory'?"

"Sort of a sink hole. If you get on the slope, you never get out. Crumbles out from under you and you wind up buried in the bottom. There you stay-until your air gives out. Lot of prospectors die that way.

They go out alone and are likely to come back in the dark."

"How do you know what happens if they go out alone?"

"Suppose you saw tracks leading up to one and no tracks going away?"

"Oh!" Bruce felt silly.

The troop swung into a lope; slowly the hills drew closer and loomed high into the sky. Mr. Andrews called a halt. "Camp," he said. "Sam, spot the shelter west of that outcropping. Bruce, watch what Sam does.

The shelter was an airtight tent, framed by a half cylinder of woven heavy wire. The frame came in sections. The Scoutmaster's huge pack was the air bag.

The skeleton was erected over a ground frame, anch.o.r.ed at corners and over which was spread an asbestos pad. The curved roof and wall sections followed. Sam tested joints with a wrench, then ordered the air bag unrolled. The air lock, a steel drum, was locked into the frame and gasketed to the bag.

Meanwhile, two Scouts were rigging a Sun shade.

Five boys crawled inside and stood up, arms stretched high. The others pa.s.sed in all the duffel except skis and poles. Mr. Andrews was last in and closed the air lock. The metal frame blocked radio communication; Sam plugged a phone connection from the lock to his helmet. "Testing," he said.

Bruce could hear the answer, relayed through Sam's radio. "Ready to inflate."

"Okay." The bag surged up, filling the frame. Sam said, "You go on, Bruce. There's nbthing left but to adjust the shade."

"I'd better watch."

"Okay." The shade was a flimsy venetian blind, stretched over the shelter. Sam half-opened the slats.

"It's cold inside," he commented, "from expanding gas. But it warms up fast." Presently, coached by phone, he closed them a bit. "Go inside," he urged Bruce. "It may be half an hour before I get the temperature steady."

"Maybe I should," admitted Bruce. "I feel dizzy."

Sam studied him. "Too hot?"

"Yeah, I guess so."

"You've held still in the Sun too long. Doesn't give the air a chance to circulate. Here." Sam opened Bruce's supply valve wider; "Go inside."

Gratefully, Bruce complied.

As he backed in, and straightened up, two boys grabbed him. They closed his valves, unlocked his helmet, and peeled off his suit. The suit traveled from hand to hand and was racked. Bruce looked around.

Daylamps were strung from air lock to a curtain at the far end that shut off the sanitary unit. Near this curtain suits and helmets were racked. Scouts were lounging on both sides of the long room. Near the entrance a Scout was on watch at the air conditioner, a blood-oxygen indicator clipped to his ear.

Nearby, Mr. Andrews phoned temperature changes to Sam. In the middle of the room Chubby had set up his commissary. He waved. "Hi, Bruce! Siddown-chow in two shakes."

Two Scouts made room for Bruce and he sat. One of them said, "Y'ever been at Yale?" Bruce had not. "That's where I'm going," the Scout confided. "My brother's there now." Bruce began to feel at home.

When Sam came in Chubby served chow, beef stew, steaming and fragrant, packaged rolls, and bricks of peach ice cream. Bruce decided that Moon Scouts had it soft. After supper, the Bugler got out his harmonica and played. Bruce leaned back, feeling pleasantly drowsy.

"Hollifield!" Bruce snapped awake. "Let's try you on first aid."

For thirty minutes Bruce demonstrated air tourniquets and emergency suit patches, artificial respiration for a man in a s.p.a.ce suit, what to do for Sun stroke, for anoxia, for fractures. "That'll do," the Scoutmaster concluded. "One thing: What do you do if a man cracks his helmet?"

Bruce was puzzled. "Why," he blurted, "you bury him."

"Check," the Scoutmaster agreed. "So be careful. Okay, sports-six hours of sleep. Sam, set the watch."

Sam a.s.signed six boys, including himself. Bruce asked, "Shouldn't I take a watch?"

Mr. Andrews intervened. "No. And take yourself off, Sam. You'll take Bruce on his two-man hike tomorrow; you'll need your sleep."

"Okay, Skipper." He added to Bruce, "There's nothing to it. I'll show you." The Scout on duty watched several instruments, but, as with suits, the important one was the blood-oxygen reading. Stale air was pa.s.sed through a calcium oxide bath, which precipitated carbon dioxide as calcium carbonate. The purified air continued through dry sodium hydroxide, removing water vapor.

"The kid on watch makes sure the oxygen replacement is okay," Sam went on. "If anything went wrong, he'd wake us and we'd scramble into suits."

Mr. Andrews shooed them to bed. By the time Bruce had taken his turn at the sanitary unit and found a place to lie down, the harmonica was sobbing: "Day is done Gone the Sun. . ."

It seemed odd to hear Taps when the Sun was still overhead. They couldn't wait a week for sundown, of course. These colonials kept funny~ hours. . . bed at what amounted to early evening, up at one in the morning. He'd ask Sam. Sam wasn't a bad guy-a little bit know-it-all. Odd to sleep on a bare floor, too- not that it mattered with low gravity. He was still pondering it when his ears were a.s.saulted by Reveille, played on the harmonica.

Breakfast was scrambled eggs, cooked on the spot. Camp was struck, and the troop was moving in less than an hour. They headed for Base Camp at a lope.

The way wound through pa.s.ses, skirted craters. They had covered thirty miles and Bruce was getting hungry when the pathfinder called, "Heel and toe!" They converged on an air lock, set in a hillside.

Base Camp had not the slick finish of Luna City, being rough caverns sealed to airtightness, but each troop had its own well-equipped troop room. Air was renewed by hydroponic garden, like Luna City; there was a Sun power plant and acc.u.mulators to last through the long, cold nights.

Bruce hurried through lunch; he was eager to start his two-man hike. They outfitted as before, except that reserve air and water replaced packaged grub. Sam fitted a spring-fed clip of hiking rations into the collar of Bruce's suit.

The Scoutmaster inspected them at the lock. "Where to, Sam?"

"We'll head southeast. I'll blaze it."

"Hmm-rough country. Well, back by midnight, and stay out of caves."

"Yes, sir."

Outside Sam sighed, "Whew! I thought he was going to say not to climb."

"We're going to?"

"Sure. You can, can't you?"

"Got my Alpine badge."

"I'll do the hard part, anyhow. Let's go."

Sam led out of the hills and across a baked plain. He hit an eight-mile gait, increased it to a twelve-miler. Bruce swung along, enjoying it. "Swell of you to do this, Sam."

"Nuts. If I weren't here, I'd be helping to seal the gymnasium."

"Just the same, I need this hike for my Mooncraft badge."

Sam let several strides pa.s.s. "Look, Bruce-you don't really expect to make Lunar Eagle?"

"Why not? I've got my optional badges. There are only four required ones that are terribly different: camping, Mooncraft, pathfinding, and pioneering. I've studied like the d.i.c.kens and now I'm getting experience.