Rizzett was still with them. One of the advantages of the trailer was that they could put up a guest overnight. He said, "They're getting details on the atmosphere now. Lots of oxygen, almost 30 per cent, and nitrogen and inert gases. It's quite normal. No chlorine." Then he paused and said, "Hmm."

Gillbret said, "What's the matter?"

"No carbon dioxide. That's not so good."

"Why not?" demanded Artemisia from her vantage point near the visiplate, where she watched the distant surface of the planet blur past at two thousand miles an hour.

Biron said curtly, "No carbon dioxide-no plant life."

"Oh?" She looked at him, and smiled warmly.

Biron, against his will, smiled back, and somehow, with scarcely a visible change in her countenance, she was smiling through him, past him, obviously unaware of his existence; and he was left there, caught in a foolish smile. He let it fade.

It was just as well he avoided her. Certainly, when he was with her, he couldn't keep it up. When he could actually see her, the anesthetic of his will didn't work. It began hurting.

Gillbret was doleful. They were coasting now. In the thick lower reaches of the atmosphere, the Remorseless, with its aerodynamically undesirable addition of a trailer, was difficult to handle. Biron fought the bucking controls stubbornly.

He said, "Cheer up, Gil!"

He felt not exactly jubilant himself. Radio signals had brought no response as yet, and if this were not the rebellion world, there would be no point in waiting longer. His line of action was set!

Gillbret said, "It doesn't look like the rebellion world. It's rocky and dead, and not much water, either." He turned. "Did they try for carbon dioxide again, Rizzett?"

Rizzett's ruddy face was long. "Yes. Just a trace. About a thousandth of a per cent or so."

Biron said, "You can't tell. They might pick a world like this, just because it would look so hopeless."

"But I saw farms," said Gillbret.

"All right. How much do you suppose we can see of a planet this size by circling it a few times? You know damn well, Oil, that whoever they are, they can't have enough people to fill a whole planet. They may have picked themselves a valley somewhere where the carbon dioxide of the air has been built up, say, by volcanic action, and where there's plenty of nearby water. We could whiz within twenty miles of them and never know it. Naturally, they wouldn't be ready to answer radio calls without considerable investigation."

"You can't build up a concentration of carbon dioxide that easily," muttered Gillbret. But he watched the visiplate intently.

Biron suddenly hoped that it was the wrong world. He decided that he could wait no longer. It would have to be settled, now!

It was a queer feeling.

The artificial lights had been turned off and sunlight was coming in unhindered at the ports. Actually, it was the less efficient method of lighting the ship, but there was a sudden desirable novelty to it. The ports were open, in fact, and a native atmosphere could be breathed.

Rizzett advised against it on the grounds that lack of carbon dioxide would upset the respiratory regulation of the body, but Biron thought it might be bearable for a short time.

Gillbret had come upon them, heads together. They looked up and leaned away from each other.

Gillbret laughed. Then he looked out of the open port, sighed, and said, "Rocks!"

Biron said mildly, "We're going to set up a radio transmitter at the top of the high ground. We'll get more range that way. At any rate, we ought to be able to contact all of this hemisphere. And if it's negative, we can try the other side of the planet."

"Is that what you and Rizzett were discussing?"

"Exactly. The Autarch and I will do the job. It's his suggestion, which is fortunate; since otherwise I would have had to make the same suggestion myself." He looked fleetingly at Rizzett as he spoke. Rizzett was expressionless.

Biron stood up. "I think it would be best if I unzipped my space-suit lining and wore that."

Rizzett was in agreement. It was sunny on this planet; there was little water vapor in the air and no clouds, but it was briskly cold.

The Autarch was at the main lock of the Remorseless. His overcoat was of thin foamite that weighed a fraction of an ounce, yet did a nearly perfect job of insulation. A small carbon-dioxide cylinder was strapped to his chest, adjusted to a slow leak that would maintain a perceptible CO2 vapor tension in his immediate vicinity.

He said, "Would you care to search me, Farrill?" He raised his hands and waited, his lean face quietly amused.

"No," said Biron. "Do you want to check me for weapons?"

"I wouldn't think of it."

The courtesies were as frigid as the weather.

Biron stepped out into the hard sunlight and tugged at the handle of the two-handled suitcase in which the radio equipment was stowed. The Autarch caught the other.

"Not too heavy," said Biron. He turned, and Artemisia was standing just within the ship, silent.

Her dress was a smooth, unfigured white which folded in a smooth drape that fled before the wind. The semitransparent sleeves whipped back against her arms, turning them to silver.

For a moment Biron melted dangerously. He wanted to return quickly; to run, leap into the ship, grasp her so that his fingers would leave bruises on her shoulders, feel his lips meet hers-

But he nodded briefly instead, and her returning smile, the light flutter of her fingers was for the Autarch.

Five minutes later he turned and there was still that glimmer of white at the open door, and then the rise in the ground cut off the view of the ship. The horizon was free of everything but broken and bare rock now.

Biron thought of what lay ahead, and wondered if he would ever see Artemisia again-and if she would care if he never returned.

Artemesia watched them as they became tiny figures, trudging up the bare granite, then dipping below and out of sight. For a moment, just before they disappeared, one of them had turned. She couldn't be sure which one, and, for a moment, her heart hardened.

He had not said a word on parting. Not one word. She turned away from the sun and rock toward the confined metal interior of the ship. She felt alone, terribly alone; she had never felt so alone in her life.

It was that, perhaps, that made her shiver, but it would have been an intolerable confession of weakness to admit that it wasn't simply the cold.

She said peevishly, "Uncle Gil! Why don't you close the ports? It's enough to freeze a person to death." The thermometer dial read plus seven centigrade with the ship's heaters on high.

"My dear Arta," said Gillbret mildly, "if you will persist in your ridiculous habit of wearing nothing but a little fog here and there, you must expect to be cold." But he closed certain contacts, and, with little clicks, the air lock slid shut, the ports sunk inward and molded themselves into the smooth, gleaming hull. As they did so, the thick glass polarized and became nontransparent. The lights of the ship went on and the shadows disappeared.

Artemisia sat down in the heavily padded pilot's seat and fingered the arms aimlessly. His hands had often rested there, and the slight warmth that flooded her as she thought that (she told herself) was only the result of the heaters making themselves felt decently, now that the outer winds were excluded.

The long minutes passed, and it became impossible to sit quietly. She might have gone with him! She corrected the rebellious thought instantly as it passed through her mind, and changed the singular "him" to the plural "them."

She said, "Why do they have to set up a radio transmitter anyway, Uncle Gil?"