"It's natural," said Calhoun, "but perhaps lacking in charity. Look here! How about those astrogators? I need them for a job I have in mind."

Maril wrung her hands.

"C--come here," she said in a low tone.

There was an armed guard in the control-room of the ship. He'd watched Calhoun a good part of the previous day as Calhoun performed his mysterious work. He'd been off-duty and now was on duty again. He was bored. So long as Calhoun did not touch the control-board, though, he was uninterested. He didn't even turn his head when Maril led the way into the other cabin and slid the door shut.

"The astrogators are coming," she said swiftly. "They'll bring some boxes with them. They'll ask you to instruct them so they can handle our ship better. They lost themselves coming back from Orede, no, they didn't lose themselves, but they lost time--enough time almost to make an extra trip for meat. They need to be experts. I'm to come along, so they can be sure that what you teach them is what you've been doing right along."

Calhoun said;

"Well?"

"They're crazy!" said Maril vehemently. "They knew Weald would do something monstrous sooner or later. But they're going to try to stop it by more monstrousness sooner! Not everybody agrees, but there are enough. So they want to use your ship--it's faster in overdrive and so on. And they'll go to Weald--in this ship--and--they say they'll give Weald something to keep it busy without bothering us!"

Calhoun said drily;

"This pays me off for being too sympathetic with blueskins! But if I'd been hungry for a couple of years, and was despised to boot by the people who kept me hungry, I suppose I might react the same way. No," he said curtly as she opened her lips to speak again. "Don't tell me the trick. Considering everything, there's only one trick it could be. But I doubt profoundly that it would work. All right."

He slid the door back and returned to the control-room. Maril followed him. He said detachedly;

"I've been working on a problem outside of the food one. It isn't the time to talk about it right now, but I think I've solved it."

Maril turned her head, listening. There were footsteps on the tarmac outside the ship. Both doors of the airlock were open. Four men came in.

They were young men who did not look quite as hungry as most Darians, but there was a reason for that. Their leader introduced himself and the others. They were the astrogators of the ship Dara had built to try to bring food from Orede. They were not good enough, said their self-appointed leader. They overshot their destination. They came out of overdrive too far off line. They needed instructions.

Calhoun nodded, and observed that he'd been asking for them.

"We've got orders," said their leader, steadily, "to come on board and learn from you how to handle this ship. It's better than the one we've got."

"I asked for you," repeated Calhoun. "I've an idea I'll explain as we go along. Those boxes?"

Someone was pa.s.sing in iron boxes through the airlock. One of the four very carefully brought them inside.

"They're rations," said a second young man. "We don't go anywhere without rations--except Orede."

"Orede, yes. I think we were shooting at each other there," said Calhoun pleasantly. "Weren't we?"

"Yes," said the young man.

He was neither cordial nor antagonistic. He was impa.s.sive. Calhoun shrugged.

"Then we can take off immediately. Here's the communicator and there's the b.u.t.ton. You might call the grid and arrange for us to be lifted."

The young man seated himself at the control-board. Very professionally, he went through the routine of preparing to lift by landing-grid, which routine has not changed in two hundred years. He went briskly ahead until the order to lift. Then Calhoun stopped him.

"Hold it!"

He pointed to the airlock. Both doors were open. The young man at the control-board flushed vividly. One of the others closed and dogged the doors.

The ship lifted. Calhoun watched with seeming negligence. But he found occasion for a dozen corrections of procedure. This was presumably a training voyage of his own suggestion. Therefore when the blueskin pilot would have flung the Med Ship into undirected overdrive, Calhoun grew stern. He insisted on a destination. He suggested Weald. The young men glanced at each other and accepted the suggestion. He made the acting pilot look up the intrinsic business of its sun and measure its apparent brightness from just off Dara. He made him estimate the change in brightness to be expected after so many hours in overdrive, if one broke out to measure.

The first blueskin student pilot ended a Calhoun-determined tour of duty with rather more of respect for Calhoun than he'd had at the beginning.

The second was anxious to show up better than the first. Calhoun drilled him in the use of brightness-charts, by which the changes in apparent brightness of stars between overdrive hops could be correlated with angular changes to give a three-dimensional picture of the nearer heavens. It was a highly necessary art which had not been worked out on Dara, and the prospective astrogators became absorbed in this and other fine points of s.p.a.ce-piloting. They'd done enough, in a few trips to Orede, to realize that they needed to know more. Calhoun showed them.

Calhoun did not try to make things easy for them. He was hungry and easily annoyed. It was sound training tactics to be severe, and to phrase all suggestions as commands. He put the four young men in command of the ship in turn, under his direction. He continued to use Weald as a destination, but he set up problems in which the Med Ship came out of overdrive pointing in an unknown direction and with a precessory motion.

He made the third of his students identify Weald in the celestial globe containing hundreds of millions of stars, and get on course in overdrive toward it. The fourth was suddenly required to compute the distance to Weald from such data as he could get from observation, without reference to any records.

By this time the first man was chafing to take a second turn. Calhoun gave each of them a second gruelling lesson. He gave them, in fact, a highly condensed but very sound course in the art of travel in s.p.a.ce.

His young students took command in four-hour watches, with at least one breakout from overdrive in each watch. He built up enthusiasm in them.

They ignored the discomfort of being hungry, though there had been no reason for them to stint on food in Orede--in growing pride in what they came to know.

When Weald was a first-magnitude star, the four were not highly qualified astrogators, to be sure, but they were vastly better s.p.a.cemen than at the beginning. Inevitably, their att.i.tude toward Calhoun was respectful. He'd been irritable and right. To the young, the combination is impressive.

Maril had served as pa.s.senger only. In theory she was to compare Calhoun's lessons with his practise when alone. But he did nothing on this journey which--teaching considered--was different from the two interstellar journeys Maril had made with him. She occupied the sleeping-cabin during two of the six watches of each ship-day. She operated the food-readier, which was almost completely emptied of its original store of food;--confiscated by the government of Dara. That amount of food would make no difference to the planet, but it was wise for everyone on Dara to be equally ill-fed.

On the sixth day out from Dara, the sun of Weald had a magnitude of minus five-tenths.[A] The electron telescope could detect its larger planets, especially a gas-giant fifth-orbit world of high albedo.

Calhoun had his four students estimate its distance again, pointing out the difference that could be made in breakout position if the Med Ship were mis-aimed by as much as one second of arc.

[A] Earth's sun, from Earth, is of magnitude roughly minus thirty-six.

"That does it," Calhoun announced cheerfully. "That's the last order I'll give you. You're graduate pilots from here on! Relax and have some coffee."

"And now," said Calhoun, "I suppose you'll tell me the truth about those boxes you brought on board. You said they were rations, but they haven't been opened in six days. I have an idea what they mean, but you tell me."

The four looked uncomfortable. There was a long pause.

"They could be," said Calhoun detachedly, "cultures to be dumped on Weald. Weald is making plans to wipe out Dara. So some fool has decided to get Weald too busy fighting a plague of its own to bother with you.

Is that right?"

The young men stirred uneasily. "Well--l--l, sir," said one of them, unhappily, "that's what we were ordered to do."

"I object," said Calhoun. "It wouldn't work. I just left Weald a little while back, remember. They've been telling themselves that some day Dara would try that. They've made preparations to fight any imaginable contagion you could drop on them. Every so often somebody claims it's happening. It wouldn't work."

"But--"

"In fact," said Calhoun, "I will not permit you to do anything of the kind."

One of the young men, staring at Calhoun, nodded suddenly. His eyes closed. He jerked his head erect and looked bewildered. A second sank heavily into a chair. He said remotely, "Thish sfunny!" and abruptly went to sleep. The third found his knees giving away. He paid elaborate attention to them, stiffening them. But they yielded like rubber and he went slowly down to the floor. The fourth said thickly with difficulty, yet reproachfully;

"'Thought y'were our frien'!"