Mandel said, 'He's an extraterrologist, yes, but he's never visited any of the planets on which he is expert and he never will. In thirty years, he's never been more than a few miles from this room.'
Ryger laughed.
Mandel flushed angrily. 'You may find it funny, but I'd appreciate your being careful what you say when Dr. Urth comes back.'
Urth sidled in a moment later. 'My apologies, gentlemen,' he said in a whisper. 'And now let us approach our problem. Perhaps one of you wishes to confess?'
Talliaferro's lips quirked sourly. This plump, self-imprisoned extraterrologist was scarcely formidable enough to force a confession from anyone. Fortunately there would be no need of him.
Talliaferro said, 'Dr. Urth, are you connected with the police?'
A certain smugness seemed to suffuse Urth's ruddy face. 'I have no official connection, Dr. Talliaferro, but my unofficial relationships are very good indeed.'
'In that case, I will give you some information which you can carry to the police.'
Urth drew in his abdomen and hitched at his shirttail. It came free and slowly he polished his glasses with it. When he was quite through and had perched them precariously on his nose once more, he said, 'And what is that?'
'I will tell you who was present when Villiers died and who scanned his paper.'
'You have solved the mystery?'
'I've thought about it all day. I think I've solved it.' Talliaferro rather enjoyed the sensation he was creating.
'Well, then?'
Talliaferro took a deep breath. This was not going to be easy to do, though he had been planning it for hours. The guilty man,' he said, 'is obviously Dr. Hubert Mandel.'
Mandel stared at Talliaferro in sudden, hard-breathing indignation. 'Look here, Doctor,' he began loudly, 'if you have any basis-'
Urth's tenor voice soared above the interruption. 'Let him talk, Hubert, let us hear him. You suspected him and there is no law that forbids him to suspect you.'
Mandel fell angrily silent.
Talliaferro, not allowing his voice to falter, said, 'It is more than just suspicion. Dr. Urth. The evidence is perfectly plain. Four of us knew about mass transference, but only one of us. Dr. Mandel, had actually seen a demonstration. He knew it to be a fact. He knew a paper on the subject existed. We three knew only that Villiers was more or less unbalanced. Oh, we might have thought there was just a chance. We visited him at eleven, I think, just to check on that, though none of us actually said so, but he only acted crazier than ever.
'Check special knowledge and motive then on Dr. Mandel's side. Now, Dr. Urth, picture something else. Whoever it was who confronted Villiers at midnight, saw him collapse, and scanned his paper (let's keep him anonymous for a moment) must have been terribly startled to see Villiers apparently come to life again and to hear him talking into the telephone. Our criminal, in the panic of the moment, realized one thing: he must get rid of the one piece of incriminating material evidence.
'He had to get rid of the undeveloped film of the paper and he had to do it in such a way that it would be safe from discovery so that he might pick it up once more if he remained unsuspected. The outer window sill was ideal. Quickly he threw up Villiers' window, placed the strip of film outside, and left. Now, even if
Villiers survived or if his telephoning brought results, it would be merely Villiers' word against his own and it would be easy to show that Villiers was unbalanced.'
Talliaferro paused in something like triumph. This would be irrefutable.
Wendell Urth blinked at him and wiggled the thumbs of his clasped hands so that they slapped against his ample shirt front. He said, 'And the significance of all that?'
The significance is that the window was thrown open and the film placed in open air. Now Ryger has lived for ten years on Ceres, Kaunas on Mercury, I on the Moon-barring short leaves and not many of them. We commented to one another several times yesterday on the difficulty of growing acclimated to Earth.
'Our work worlds are each airless objects. We never go out in the open without a suit. To expose ourselves to unenclosed space is unthinkable. None of us could have opened the window without a severe inner struggle. Dr. Mandel, however, has lived on Earth exclusively. Opening a window to him is only a matter of a bit of muscular exertion. He could do