"Why don't we all go?" somebody wanted to know.

"Because," said Mr. Perrin, "right now I've - only got one lost. I don't want to make it a dozen." Then he left, taking big easy lopes that covered fifty feet at a step.

Dad started to take out after him, then thought better of it, for Mother suddenly keeled over, collapsing at the knees and floating gently to the ground. Everybody started talking at once. Some idiot wanted to take her helmet off, but Dad isn't crazy. I switched off my radio so I could hear myself think and started looking around, not leaving the crowd but standing up on the lip of the crater and trying to see as much as I could.

I was looking back the way we had come; there was no sense in looking at the crater-if he had been in there he would have shown up like a fly on a plate.

Outside the crater was different; you could have hidden a regiment within a block of us, rocks standing up every which way, boulders big as houses with blow holes all through them, spires, gulleys-it was a mess. I could see Mr. Perrin every now and then, casting around like a dog after a rabbit, and making plenty of time. He was practically flying. When he came to a big boulder he would jump right over it, leveling off face down at the top of his jump, so he could see better.

Then he was heading back toward us and I switched my radio back on. There was still a lot of talk. Somebody was saying, "We've got to find him before sundown," and somebody else answered, "Don't be silly; the sun won't be down for a week. It's his air supply, I tell you. These suits are only good for four hours." The first voice said, "Oh!" then added softly, "like a fish out of water-" It was then I got scared.

A woman's voice, sounding kind of choked, said, "The poor, poor darling! We've got to find him before he suffocates," and my father's voice cut in sharply, "Shut up talking that way!" I could hear somebody sobbing. It might have been Mother.

Mr. Perrin was almost up to us and he cut in, "Silence everybody! I've got to call the base," and he added urgently, "Perrin, calling airlock control; Perrin, calling airlock control!"

A woman's voice answered, "Come in, Perrin." He told her what was wrong and added, "Send out Smythe to take this party back in. I'm staying. I want every ranger who's around and get me volunteers from among any of the experienced Moon hands. Send out a radio direction-finder by the first ones to leave."

We didn't wait long, for they came swarming toward us like gra.s.shoppers. They must have been running forty or fifty miles an hour. It would have been something to see, if I hadn't been so sick at my stomach.

Dad put up an argument about going back, but Mr. Perrin shut him up. "If you hadn't been so confounded set on having your own way, we wouldn't be in a mess. If you had kept track of your kid, he wouldn't be lost. I've got kids of my own; I don't let 'em go out on the face of the Moon when they're too young to take care of themselves. You go on back - I can't be burdened by taking care of you, too."

I think Dad might even have gotten in a fight with him if Mother hadn't gotten faint again. We went on back with the party.

The next couple of hours were pretty awful. They let us sit just outside the control room where we could hear Mr. Perrin directing the search, over the loudspeaker. I thought at first that they would snag the runt as soon as they started using the radio direction-finder-pick up his power hum, maybe, even if he didn't say anything-but no such luck; they didn't get anything with it. And the searchers didn't find anything either.

A thing that made it worse was that Mother and Dad didn't even try to blame me. Mother was crying quietly and Dad was consoling her, when he looked over at me with an odd expression. I guess he didn't really see me at all, but I thought he was thinking that if I hadn't insisted on going out on the surface this wouldn't have happened. I said, "Don't go looking at me, Dad. n.o.body told me to keep an eye on him. I thought he was with Mother."

Dad just shook his head without answering. He was looking tired and sort of shrunk up. But Mother, instead of laying in to me and yelling, stopped her crying and managed to smile. "Come here, d.i.c.kie," she said, and put her other arm around me. "n.o.body blames you, d.i.c.kie. Whatever happens, you weren't at fault. Remember that, d.i.c.kie."

So I let her kiss me and then sat with them for a while, but I felt worse than before. I kept thinking about the runt, somewhere out there, and his oxygen running out. Maybe it wasn't my fault, but I could have prevented it and I knew it. I shouldn't have depended on Mother to look out for him; she's no good at that sort of thing. She's the kind of person that would mislay her head if it wasn't knotted on tight - the ornamental sort. Mother's good, you understand, but she's not practical. She would take it pretty hard if the runt didn't come back. And so would Dad-and so would I. The runt is an awful nuisance, but it was going to seem strange not to have him around underfoot. I got to thinking about that remark, "Like a fish out of water." I accidentally busted an aquarium once; I remember yet how they looked. Not pretty. If the runt was going to die like that - I shut myself up and decided I just had to figure out some way to help find him.

After a while I had myself convinced that I could find him if they would just let me help look. But they wouldn't of course.

Dr. Evans the Director showed up again-he'd met us when we first came in - and asked if there was anything he could do for us and how was Mrs. Logan feeling? "You know I wouldn't have had this happen for the world," he added. "We're doing all we can. I'm having some ore-detectors shot over from Luna City. We might be able to spot the child by the metal in his suit."

Mother asked how about bloodhounds and Dr. Evans didn't even laugh at her. Dad suggested helicopters, then corrected himself and made it rockets. Dr. Evans pointed out that it was impossible to examine the ground closely from a rocket.

I got him aside presently and braced him to let me join the hunt. He was polite but unimpressed, so I insisted. "What makes you think you can find him?", he asked me. "We've got the most experienced Moon men available out there now. I'm afraid, son, that you would get yourself lost or hurt if you tried to keep up with them. In this country, if you once lose sight of landmarks, you can get hopelessly lost."

"But look, Doctor," I told him, "I know the runt-I mean my kid brother, better than anyone else in the world. I won't get lost-I mean I will get lost but just the way he did. You can send somebody to follow me."

He thought about it. "It's worth trying," he said suddenly. "I'll go with you. Let's suit up."

We made a fast trip out, taking thirty-foot strides-the best I could manage even with Dr. Evans hanging on to my belt to keep me from stumbling. Mr. Perrin was expecting us. He seemed dubious about my scheme. "Maybe the old 'lost mule' dodge will work," he admitted, "but I'll keep the regular search going just the same. Here, Shorty, take this flashlight. You'll need it in the shadows."

I stood on the edge of the crater and tried to imagine I was the runt, feeling bored and maybe a little bit griped at the lack of attention. What would I do next?

I went skipping down the slope, not going anywhere in particular, the way the runt would have done. Then I stopped and looked back, to see if Mother and Daddy and d.i.c.kie had noticed me. I was being followed all right; Dr. Evans and Mr. Perrin were close behind me. I pretended that no one was looking and went on. I was pretty close to the first rock outcroppings by now and I ducked behind the first one I came to. It wasn't high enough to hide me but it would have covered the runt. It felt like what he would do; he loved to play hide-and-go-seek - it made him the center of attention.

I thought about it. When the runt played that game, his notion of hiding was always to crawl under something, a bed, or a sofa, or an automobile, or even under the sink. I looked around. There were a lot of good places; the rocks were filled with blow holes and overhangs. I started working them over. It seemed hopeless; there must have been a hundred such places right around close.

Mr. Perrin came up to me as I was crawling out of the fourth tight spot. "The men have shined flashlights around in every one of these places," he told me. "I don't think it's much use, Shorty."

"Okay," I said, but I kept at it. I knew I could get at spots a grown man couldn't reach; I just hoped the runt hadn't picked a spot I couldn't reach.

It went on and on and I was getting cold and stiff and terribly tired. The direct sunlight is hot on the Moon, but the second you get in the shade, it's cold. Down inside those rocks it never got warm at all. The suits they gave us tourists are well enough insulated, but the extra insulation is in the gloves and the boots and the seats of the pants-and I had been spending most of my time down on my stomach, wiggling into tight places.

I was so numb I could hardly move and my whole front felt icy. Besides, it gave me one more thing to worry about - how about the runt? Was he cold, too?

If it hadn't been for thinking how those fish looked and how, maybe, the runt would be frozen stiff before I could get to him, I would have quit. I was about beat. Besides, it's rather scary down inside those holes-you don't know what you'll come to next.

Dr. Evans took me by the arm as I came out of one of them, and touched his helmet to mine, so that I got his voice directly. "Might as well give up, son. You're knocking your self out and you haven't covered an acre." I pulled away from him.

The next place was a little overhang, not a foot off the ground. I flashed a light into it. It was empty and didn't seem to go anywhere. Then I saw there was a turn in it. I got down flat and wiggled in. The turn opened out a little and dropped off. I didn't think it was worthwhile to go any deeper as the runt wouldn't have crawled very far in the dark, but I scrunched ahead a little farther and flashed the light down.

I saw a boot sticking out.

That's about all there is to it. I nearly bashed in my helmet getting out of there, but I was dragging the runt after me. He was limp as a cat and his face was funny. Mr. Perrin and Dr. Evans were all over me as I came out, pounding me on the back and shouting. "Is he dead, Mr. Perrin?" I asked, when I could get my breath. "He looks awful bad."

Mr. Perrin looked him over. "No . . . I can see a pulse in his throat. Shock and exposure, but this suit was specially built-we'll get him back fast." He picked the runt up in his arms and I took out after him.

Ten minutes later the runt was wrapped in blankets and drinking hot cocoa. I had some, too. Everybody was talking at once and Mother was crying again, but she looked normal and Dad had filled out.

He tried to write out a check for Mr. Perrin, but he brushed it off. "I don't need any reward; your boy found him.

"You can do me just one favor-"

"Yes?" Dad was all honey.

"Stay off the Moon. You don't belong here; you're not the pioneer type."

Dad took it. "I've already promised my wife that," he said without batting an eye. "You needn't worry."

I followed Mr. Perrin as he left and said to him privately, "Mr. Perrin-I just wanted to tell you that I'll be back, if you don't mind."

He shook hands with me and said, "I know you will, Shorty."

"It's Great to Be Back!"

"HURRY UP, ALLAN!" Home-back to Earth again! Her heart was pounding.

"Just a second." She fidgeted while her husband checked over a bare apartment. Earth-Moon freight rates made it silly to ship their belongings; except for the bag he carried, they had converted everything to cash. Satisfied, he joined her at the lift; they went on up to the administration level and there to a door marked: LUNA CITY COMMUNITY a.s.sOCIATION-Anna Stone, Service Manager.

Miss Stone accepted their apartment keys grimly. "Mr. and Mrs. MacRae. So you're actually leaving us?"

Josephine bristled. "Think we'd change our minds?"

The manager shrugged. "No. I knew nearly three years ago that you would go back-from your complaints."

"From my comp- Miss Stone, I've been as patient about the incredible inconveniences of this, this pressurized rabbit warren as anyone. I don't blame you personally, but-"

"Take it easy, Jo!" her husband cautioned her.

Josephine flushed. "Sorry, Miss Stone."

"Never mind. We just see things differently. I was here when Luna City was three air-sealed Quonset huts connected by tunnels you crawled through, on your knees." She stuck out a square hand. "I hope you enjoy being groundhogs again, I honestly do. Hot jets, good luck, and a safe landing."

Back in the lift, Josephine sputtered. "'Groundhogs' indeed! Just because we prefer our native planet, where a person can draw a breath of fresh air-"

"You use the term," Allan pointed out.

"But I use it about people who've never been off Terra."

"We've both said more than once that we wished we had had sense enough never to have left Earth. We're groundhogs at heart, Jo."

"Yes, but- Oh, Allan, you're being obnoxious. This is the happiest day of my life. Aren't you glad to be going home? Aren't you?"

"Of course I am. It'll be great to be back. Horseback riding. Skiing."

"And opera. Real, live grand opera. Allan, we've simply got to have a week or two in Manhattan before we go to the country."

"I thought you wanted to feel rain on your face."

"I want that, too. I want it all at once and I can't wait. Oh, darling, it's like getting out of jail." She clung to him.

He unwound her as the lift stopped. "Don't blubber."

"Allan, you're a beast," she said dreamily. "I'm so happy." They stopped again, in bankers' row. The clerk in the National City Bank office had their transfer of account ready. "Going home, eh? Just sign there, and your print. I envy you. Hunting, fishing."

"Surf bathing is more my style. And sailing."

"I," said Jo, "simply want to see green trees and blue sky." The clerk nodded. "I know what you mean. It's long ago and far away. Well, have fun. Are you taking three months or six?"

"We're not coming back," Allan stated flatly. "Three years of living like a fish in an aquarium is enough."

"So?" The clerk shoved the papers toward him and added without expression, "Well-hot jets."

"Thanks." They went on up to the subsurface level and took the cross-town slidewalk out to the rocket port. The slidewalk tunnel broke the surface at one point, becoming a pressurized shed; a view window on the west looked out on the surface of the Moon-and, beyond the hills, the Earth.

The sight of it, great and green and bountiful, against, the black lunar sky and harsh, unwinking stars, brought quick tears to Jo's eyes. Home-that lovely planet was hers! Allan looked at it more casually, noting the Greenwich. The sunrise Line had just touched South America-must be about eight twenty; better hurry.

They stepped off the slidewalk into the arms of some of their friends, waiting to see them off. "Hey-where have you Lugs been? The Gremlin blasts off in seven minutes."

"But we aren't going in it," MacRae answered. "No, siree."

"What? Not going? Did you change your minds?"

Josephine laughed. "Pay no attention to him, Jack. We're going in the express instead; we swapped reservations. So we've got twenty minutes yet."

"Well! A couple of rich tourists, eh?"

"Oh, the extra fare isn't so much and I didn't want to make two changes and spend a week in s.p.a.ce when we could be home in two days." She rubbed her bare middle significantly.

"She can't take free flight, Jack," her husband explained.

"Well, neither can I - I was sick the whole trip out. Still, I don't think you'll be sick, Jo; you're used to Moon weight now."

"Maybe," she agreed, "but there is a lot of difference between one-sixth gravity and no gravity."

Jack Crail's wife cut in. "Josephine MacRae, are you going to risk your life in an atomic-powered ship?"

"Why not, darling? You work in an atomics laboratory."

"Hummph! In the laboratory we take precautions. The Commerce Commission should never have licensed the expresses. I may be old-fashioned, but I'll go back the way I came, via Terminal and Supra-New York, in good old reliable fuel-rockets."

"Don't try to scare her, Emma," Crail objected. "They've worked the bugs out of those ships."

"Not to my satisfaction. I-"

"Never mind," Allan interrupted her. "The matter is settled, and we've still got to get over to the express launching site. Good-by, everybody! Thanks for the send-off. It's been grand knowing you. If you come back to G.o.d's country, look us up."

"Good-by, kids!" "Good-by, Jo-good-by, Allan." "Give my regards to Broadway!" "So long-be sure to write." "Good-by." "Aloha-hot jets!" They showed their tickets, entered the air lock, and climbed into the pressurized shuttle between Leyport proper and the express launching site. "Hang on, 'folks," the shuttle operator called back over his shoulder; Jo and Allan hurriedly settled into the cushions. The lock opened; the tunnel ahead was airless. Five minutes later they were climbing out twenty miles away, beyond the hills that shielded the lid of Luna City from the radioactive splash of the express ships.

In the Sparrowhawk they shared a compartment with a missionary family. The Reverend Doctor Simmons felt obliged to explain why he was traveling in luxury. "It's for the child," he told them, as his wife strapped the baby girl into a small acceleration couch rigged stretcher-fashion between her parents' couches. "Since she's never been in s.p.a.ce, we daren't take a chance of her being sick for days on end." They all strapped down at the warning siren. Jo felt her heart begin to pound. At last ... at long last!

The jets took hold, mashing them into the cushions. Jo had not known she could feel so heavy. This was worse, much worse, than the trip out. The baby cried as long as acceleration lasted, in wordless terror and discomfort.

After an interminable time they were suddenly weightless, as the ship went into free flight. When the terrible binding weight was free of her chest, Jo's heart felt as light as her body. Allan threw off his upper strap and sat up. "How do you feel, kid?"

"Oh, I feel fine!" Jo unstrapped and faced him. Then she hiccoughed. "That is, I think I do."

Five minutes later she was not in doubt; she merely wished to die. Allan swam out of the compartment and located the ship's surgeon, who gave her an injection. Allan waited until she had succ.u.mbed to the drug, then left for the lounge to try his own cure for s.p.a.cesickness - Mothersill's Seasick Remedy washed down with champagne. Presently he had to admit that these two sovereign remedies did not work for him-or perhaps he should not have mixed them.

Little Gloria Simmons was not s.p.a.cesick. She thought being weightless was fun, and went bouncing off floorplate, overhead, and bulkhead like a dimpled balloon. Jo feebly considered strangling the child, if she floated within reach-but it was too much effort.

Deceleration, logy as it made them feel, was welcome relief after nausea-except to little Gloria. She cried again, in fear and hurt, while her mother tried to explain. Her father prayed.

After a long, long time came a slight jar and the sound of the siren. Jo managed to raise her head. "What's the matter? Is there an accident?"

"I don't think so. I think we've landed."

'We can't have! We're still braking-I'm heavy as lead."