Tens of billions of miles out, the pure white orb of Rigel had reached Porus's eyes, and something in his heart uplifted him.

Type B reaction - nostalgia; conditioned reflex through association of Rigel with happy scenes of youth -

Words, phrases, equations spun through his keen brain, but he was happy in spite of them. And in a little while, the human triumphed over the psychologist and Porus abandoned analysis for the superior joy of uncritical happiness.

He sat up past the middle of the sleep period two nights before the landing to catch first glimpse of Hanlon, fourth planet of Rigel, his home world. Some place on that world, on the shores of a quiet sea, was a little two-story house. A little house - not those giant structures fit only for Arcturians and other hulking humanoids.

It was the summer season now and the house would be bathed in the pearly light of Rigel, and after the harsh yellow-red of Arcturus, how restful that would be.

And - he almost shouted in his joy - the very first night he was going to insist on gorging himself with broiled tryp-tex. He hadn't tasted it for two years, and his wife was the best hand at tryptex in the system.

He winced a little at the thought of his wife. It had been a dirty trick, getting her to stay home the last two years, but it had had to be done. He glanced over the papers before him once more. There was just a little nervousness in his fingers as they shuffled the sheets. He had spent a full day in calculating her reactions at first seeing him after two years' absence and they were not pleasant.

Nina Porus was a woman of untamed emotions, and he would have to work quickly and efficiently.

He spotted her quickly in the crowd. He smiled. It was nice to see her, even if his equations did predict long and serious storms. He ran over his initial speech once more and made a last-minute change.

And then she saw him. She waved frantically and broke from the forefront of the crowd. She was on Tan Porus before he was aware of it and, in the grip of her affectionate embrace, he went limp with surprise.

That wasn't the reaction to be expected at all! Something was wrong!

She was leading him dexterously through the crowd of reporters to the waiting stratocar, talking rapidly along the way.

'Tan Porus, I thought I'd never live to see you again. It's so good to have you with me again; you have absolutely no idea. Everything here at home is just fine, of course, but it isn't quite the same without you.'

Porus's green eyes were glazed. This speech was entirely uncharacteristic of Nina. To the sensitive ears of a psychologist, it sounded little short of the ravings of a maniac. He had not even the presence of mind to grunt at proper intervals. Frozen mutely in his seat, he watched the ground rush downwards and heard the air shriek backwards as they headed for their little house by the sea.

Nina Porus prattled on gaily - the one normal aspect of her conversation being her ability to uphold both ends of a dialogue with smooth efficiency.

'And, of course, dear, I've fixed up an entire tryptex, broiled to a turn, garnished with sarnees. And, oh yes, about that affair last year with that new planet - Earth, do you call it? I was so proud of you when I heard about it. I said -'

And so on and on, until her voice degenerated into a meaningless conglomeration of sounds.

Where were her tears? Where were the reproaches, the threats, the impassioned self-pity?

Tan Porus roused himself to one great effort at dinner. He stared at the steaming dish of tryptex before him with an odd lack of appetite and said, This reminds me of the time at Arcturus when I dined with the President Delegate -'

He went into details, dilating on the gayety and abandon of the affair, waxing lyrical over his own enjoyment of it, stressing, almost unsubtly, the fact that he had not missed his wife, and finally, in one last wild burst of desperation, mentioning casually the presence of a surprising number of Rigellian females in the Arcturian system.

And through it all, his wife sat smiling. 'Wonderful, darling,' she'd say. 'I'm so glad you enjoyed yourself. Eat your tryptex.'

But Porus did not eat his tryptex. The mere thought of food nauseated him. With one lingering stare of dismay at his wife, he arose with what dignity he could muster and left for the privacy of his room.

He tore up the equations furiously and hurled himself into a chair. He seethed with anger, for evidently something had gone wrong with Nina. Terribly wrong! Even interest in another man - and for just a moment that had occurred to him as a possible explanation - would not cause such a revolution in character.

He tore at his hair. There was some hidden factor more startling than that - but what it was he had no idea. At that, moment Tan Porus would have given the sum total of his worldly possessions to have his wife enter and make one - just one - attempt to snatch his scalp off, as of old.

And below, in the dining room, Nina Porus allowed a crafty gleam to enter her eye.

Lor Haridin put down his pen and said, 'Come in!' The door opened, and his friend, Eblo Ranin, entered, brushed off a corner of the desk and sat down.

'Haridin, I've got an idea.' His voice was uncommonly like a guilty whisper.

Haridin gazed at him suspiciously.

'Like the time,' he said, 'you set up the booby trap for old man Obel?'

Ranin shuddered. He had spent two days hiding in the ventilator shaft after that brilliant piece of work. 'No, this is legitimate. Listen, Porus left you in charge of the squid, didn't he?'

'Oh, I see what you're getting at. It's no go. I can feed the squid, but that's all. If I as much as clapped my hands at it to induce a color-change tropism, the boss would throw a fit.'

To space with him! He's parsecs away, anyway.' Ranin drew forth a two-month-old copy of the J.G.P. and folded the cover back. 'Have you been following Livell's experiments at Procyon U.? You know - magnetic fields applied with and without ultra-violet radiation.'

'Out of my field,' grunted Haridin. 'I've heard of it, but that's all. What about it?'

'Well, it's a type E reaction which gives, believe it or not, a strong Fimbal Effect in practically every case, especially in the higher invertebrates.' 'Hmm!'

'Now, if we could try it on this squid, we could -' 'No, no, no, no!' Haridin shook his head violently. 'Porus would break me. Great stars and little meteors, how he would break me!'

'Listen, you nut - Porus can't tell you what to do with the squid. It's Frian Obel that has final say. He's head of the Psychological Board, not Porus. All you have to do is to apply for his permission and you'll get it. Just between us, since that Homo Sol affair last year, he can't stand the sight of Porus anyway.'

Haridin weakened. 'You ask him.'

Ratlin coughed. 'No. On the whole, perhaps I'd better not. He's sort of got a suspicion that I set that booby trap, and I'd rather keep out of his way.'

'Hmm. Well -all right!'

Lor Haridin looked as if he had not slept well for a week -which shows that sometimes appearances are not deceiving. Eblo Ranin regarded him with patient kindliness and sighed.

'Look! Will you please sit down? Santin said he would have the final results in today, didn't he?'

'I know, I know, but it's humiliating. I spent seven years on higher math. And now I make a stupid mistake and can't even find it!'

'Maybe it's not there to find.'

'Don't be silly. The answer is just impossible. It must be impossible. It must be.' His high forehead creased. 'Oh, I don't know what to think.'

He continued his concentrated attempt to wear out the nap of the rug beneath and mused bitterly. Suddenly he sat down.

'It's those time integrals. You can't work with them, I tell you. You look 'em up in a table, taking half an hour to find the proper entry, and they give you seventeen possible answers. You have to pick the one that makes sense, and - Arcturus help me! - either they all do, or none do! Run up against eight of them, as we do in this problem, and we've got enough permutations to last us the rest of our life. Wrong answer! It's a wonder I lived through it at all.'