"I thought you would," returned the commander. "The question is not what blanked the screen but why it should have happened there and then. We can a.s.sume that Reffel used the shutter on his set. It would have been nice if you'd thought of that trick before the Esket went out; it would have simplified that operation a lot. Something must have come into his field of view which wouldn't c have fit in with the Esket story. But what could it have been? The Kuxmbly is five or six million cables from the Esket. I suppose one of the dirigibles could be down that way, but why should it be?"

"We won't know until another flight gets back from Destigmet's place," replied the scientist practically. "What interests me is why we didn't hear about Kervenser's disappearance earlier. Why was there time for Reffel's mission to be flown and for him to disappear too before we were told about it? Was Dondragmer late in reporting to the human observers?"

"I doubt that very much," replied Barlennan. "Actually, they may have told us about Kervenser when it happened. Remember, the runner said that other messages had been coming in. Guzmeen might not have thought the disappearance worth sending a runner for until Kerv had been gone for a while. We can check up on that in a few minutes but I imagine there's nothing funny this time.

"On the other hand, I have been wondering lately whether the people up there have always been relaying information completely and promptly. Once or twice I've had the impression that, well, things were being saved up and sent in one package. It may be just sloppiness, or it may not really be happening-"

"Or they may be deliberately organizing what we hear," said Bendivence. "Half our crew could be lost at this point without our knowing it, if the human beings chose to play it that way. I can see their being afraid we'd quit the job and demand to be taken home, according to contract, if risks proved too high."

"I suppose that's possible," admitted Barlennan. "It hadn't occurred to me just that way. I don't think that particular notion is very likely, but the more I consider the situation, the more I'd like to think of a way of checking things; at least, to make sure they're not taking time to hold conferences on just how much to tell us every time something does go wrong with an exploring cruiser."

"Do you really think there's much likelihood of that?" asked Deeslenver.

"It's hard to tell. Certainly we've been a bit less than completely frank with them and we have what we consider some very good reasons for it. I'm not really bothered either way. We know some of these people are good at business, and if we can't keep even with them it's our fault. All I really would like to be sure of is whether it's business or carelessness. I can think of one way to check up, but I'd rather not use it yet. If anyone can suggest an alternative, it will be very welcome."

"What's the one you have?" both scientists asked together, Deeslenver perhaps half a syllable ahead.

"The Erket, of course. It's the only place where we can get an independent check on what they tell us. At least, I haven't thought of any other so far. Of course, even that would take a long time; there won't be another flight from there until sunrise and that's twelve hundred hours or so away. Of course, we could send the Deedee even at nighc-"

"If we'd set up that light relay I suggesced-" began Deeslenver.

"Too risky. It would have much too big a chance of being seen. We just don't know how good the human instruments are. I know most of them stay way up at that station overhead, but I don't know what they can see from it. The casual way they distribute these picture-senders for us to carry around here on this planet suggests that they don't regard them as very fancy equipment, as does the fact that they used them twelve years ago on Mesklin. There's just too much chance that they'd spot any light on the night side of this planet. That's why I overrode your idea, Dee; otherwise, I admit it was a very good one."

"Well, there's nothing like enough metal yet for electrical contact that far," added Bendivence. "I don't have any other ideas at the moment. Come to think of it, you might make a simple test on how well the humans can pick up lights."

"How?" the question came in body att.i.tudes, not verbally.

"We could ask them innocendy if there were any way of their hunting for the running lights or the floods of the missing fliers."

Barlennan pondered the suggestion briefly.

"Good. Excellent. Let's go. However, if they say they can't, we won't be sure that they aren't just keeping it from us. You might be thinking of a further check for that." He led the way out of the map room where the discussion had been held, along the corridors of the Settlement toward the communication room. Most of the pa.s.sageways were relatively dark. The sponsors of the expedition had not stinted on the supply of artificial lights but Barlennan himself had been rather close-nippered with their distribution. Rooms were adequately lit; hallways had a bare minimum of illumination.

This gave the Mesklinites the comforting feeling that there was nothing overhead, by letting them see the stars without too much trouble. No native of that planet was really happy to face the fact that there was anything in a position to fall on him. Even the scientists glanced up occasionally as they went, taking comfort from the sight of stars not even their own. Mesklin's sun, which men called 61 Cygni, was below the horizon at the moment.

Barlennan looked upward more than he looked ahead; he was trying to get a glimpse of the human station. This carried a beacon light visible from Dhrawn, bright as a fourth-magnitude star. Its barely visible crawl against the celestial background was the best long-term clock the Mesklinites had. They used it to reset the pendulum-type instruments which they had made, which seldom agreed with each other for more than a few score hours at a time.

Stars and station alike faded from view as the trio entered the brightly lighted communication room. Guzmeen saw Barlennan and instantly reported, "No further news of either flier."

"What reports have you had from Dondragmer between the time the Kwembly ran aground and now; the last hundred and thirty hours or so? Do you know how long ago Don's first officer disappeared?"

"Only roughly, sir. The incident was reported, but nothing specific was said about how recently it had happened. I took for granted it had just occurred, but didn't ask. The two disappearances were reported quite close together: less than an hour apart."

"And you didn't wonder when the second one came in why we heard about both disappearances so nearly simultaneously, even though they must have occurred some time apart?"

"Yes, Sir. I started wondering about a quarter of an hour before you did, when the last message came in. I don't have any explanation, but I thought I'd leave it to you to ask the humans if you think one is needed."

Bendivence cut in. "Do you suppose Don failed to report the first disappearance because it resulted from a mistake, and he hoped to be able to minimize it by reporting disappearance and recovery at the same time, as minor incidents?"

Barlennan looked at the speaker speculatively but lost no time in answering.

"No, I don't suppose that. Dondragmer and I don't always agree on everything but there are some things that neither of us would do."

"Even if an immediate report couldn't really make a difference? After all, neither we nor the human beings could really help even after we'd heard the news."

"Even then."

"I don't see why."

"I do. Take my word for it; I haven't time for a detailed explanation and I doubt that I could compose one anyway. If Dondragmer failed to make that initial report, he had a very good reason. Personally I doubt very much that the failure was his. Guz, which humans gave you the reports? Was it always the same one?"

"No, Sir. I didn't recognize all their voices, and they often didn't bother to identify themselves. About half the time nowadays the reports come in human language. Most of the rest come from the Hoffman humans. There are others who speak our language but those two seem the only ones who do it comfortably. With the young one particularly, I got the impression that he'd been talking a lot with the Kuvmbly and I a.s.sumed that if there were casual chatter going on, nothing much serious could be happening."

"All right. I'd probably have done the same. I'll use the set; I have a couple of questions to put to the humans." Barlennan took his place in front of the pickup, the speaker on watch making way for him without being ordered. The screen was blank. The captain squeezed the "attention" control and waited patiently for the minute to pa.s.s. He could have started talking at once, since it was a safe bet that whoever was at the other end would lose no time readying his receiver, but Barlennan wanted to see who was there. If the delay made anyone suspicious, he'd have to live with it.

The face which did appear was unfamiliar to him. Even fifty Earth years of acquaintance with human beings had not sufficed to educate him in such matters as family resemblance, though no human being would have failed to guess that Benj was Easy's son. Actually, the fifty years had not supplied many dif ferent people for comparison; fewer than two score men, and no women, had ever landed on Mesklin. Guzmeen recognized the boy but was spared the need to tell Barlennan by Benj himself.

"Benj Hoffman here," the image spoke. "Nothing has come from the Kuvmbly since Mother called you about twenty minutes ago and there are no engineers or scientists in this room at the moment. If you have questions which need technical answers, tell me so I can call the right one. If it's just a matter of detail as to what's been happening, I've been here in the comm room most of the last seven hours and can probably tell you. I'm waiting."

"I have two questions," Barlennan responded. "One of them you can probably answer, the other perhaps not. The first has to do with the second disappearance. I am wondering how far from the Kwembly the second helicopter was when it ceased communicating. If you don't know the distance, perhaps you can tell me how long its pilot had been searching."

"The second does depend on a bit of your technology which I don't know but you may. Is there any possibility of your seeing lights such as those on the helicopters from where you are? I suppose it couldn't be done by your unaided eyes any more than it could be done by mine but you have many optical devices which I know little about, probably some which I've never heard of. I'm standing by."

Benj's screened image held up one finger and nodded just as Barlennan finished speaking but the boy waited for the other question to reach him before he spoke.

"I can answer your first question, and Mr. Cavanaugh has gone to find someone who can take care of the second," were his opening words. "Kervenser started out on his scouting flight about eleven hours ago. It wasn't realized that he must be in trouble until about eight hours later, when everything popped at once: Kervenser and his flier gone, the Kwembly frozen in and Beetchermarlf and Takoorch somewhere under the ice; at least, no one knows that's where they are but they were working under the hull and there's no other place anyone can think of for them to be. One of the sailors, Reffel, took up the other flier with a vision set to look for Kervenser, and searched very close to the Ksuembly for a while. Then we suggested that he move out to where an accident to Kervenser wouldn't have been seen or heard from the cruiser, which he did; of course Dondragmer lost sight of him from the bridge. Then we got into a discussion with the captain; everyone up here got interested and it turned out that no one was watching Reffel's screen for several minutes. Then someone noticed that the screen had gone completely blank: not no-signal blank but nolight black; that was that."

Barlennan glanced at Guzmeen and the scientists. None of them spoke, but none of them needed to. No one had been watching the screen when Reffel used the shutter! It was not the sort of luck one counted on.

Benj was still speaking.

"The sound wasn't on, of course, since no one had been talking with Reffel, and no one has any idea what happened. This was just before my mother called you, less than half an hour ago. That would make something like two and a half hours between the two disappearances. We'll have to wait for your other answer, since Mr. Cavanaugh isn't back yet."

Barlennan was a little bewildered by the arithmetic, since the boy had used Mesklinite number-words with human number-background. He got it straight after a few seconds of thought.

"I'm not complaining," he returned, "but I gather from what you say that over two hours pa.s.sed between the Kwembly's freezing in and Kervenser's disappearance, and our being told about it. Do you know why that might have happened? I realize, of course, that there was nothing I could have done but there was some understanding about keeping me up to date with the land-cruisers. I don't know just what your job is at the station; you may not have that information; but I hear from my communications man that you have been talking a lot to the Kwembly, so you may be able to help. I'm waiting."

Barlennan had several motives behind his closing remark. One was obvious enough; he wanted to learn more about Benj Hoffman, especially since the latter was good with the Mesklinite language and if Guz were right, seemed to want to talk to Mesklinites. Maybe he would be like the other Hoffman, a second sympathy-center in the station. If so, it would be important to know just how much weight he could swing.

Also, the commander wanted to check un.o.btrusively on Guzmeen's notion that Ben had been chattering with Kwembly crew members. Finally, even Barlennan could tell that Benj was young for a human being doing serious work: his selection of words and general narrative style had been a give-away. That fact might well be put to good use if a reasonably close relationship could be established.

The boy's answer, when it finally came, was inconclusive in one way but promising in another.

"I don't know why you weren't told about Kervenser and the freeze-up right away," he said. "Personally, I thought you had been. I'd been talking a lot with Beetchermarlf; I guess you know him; one of Don's helmsmen; the one you can talk with and not just listen to. When I heard he'd disappeared I was concentrating on what could be done about it. I wasn't here in the comm room quite all the time; it's not my duty station. I just come when I can to talk with Beetch. I admit someone should have told you sooner. If you'd like I'll try to find out who should have and why he didn't. My mother ought to know, or Mr. Mersereau.

"I don't know how much explaining I'd better supply about the background to my job here. On Earth, when someone finishes basic education (the sort of thing everyone has to get, like reading and physics and sociology) he has to work at unskilled labor on some essential job for two to three of our years before he is eligible for either specialized or general higher education. n.o.body says it right out, but everyone knows that the people you work for have the main say in what you can do afterward. Nominally I'm a.s.signed to the aerology lab here as a sort of picker-upper and hey-you; actually anyone in the station who yells first and loudest gets me. I must admit they don't make my life very hard. I've been able to spend a lot of time talking to Beetch the last few days." Barlennan was able, with fifty years experience, to translate without effort the thought behind a human being's use of the word day. "Of course," the boy went on, "knowing your language helps. My mother's a language nut, and I picked it up from her. She started on yours ten years ago when Dad was first connected with the Dhrawn project. I'll probably be doing comm work semi-officially a good deal of the time from now on. Here comes Mr. Cavanaugh with one of the astronomers whose name I think is Tebbetts. They'll answer your question about seeing lights, and I'll try to find out about the other business."

Benj's face was replaced on the screen by that of the astronomer, a set of broad, dark features which rather surprised Barlennan. He had never seen a bearded human being, though he was used to wide variations in cranial hair. Tebbetts' was a small Van d.y.k.e adornment quite compatible with a s.p.a.ce helmet but it made a drastic difference to the Mesklinite's eye. Barlennan decided that asking the astronomer about it would be tactless. It might be better to get the information from Benj later. There was nothing to be gained by embarra.s.sing anyone.

The facial extension, to the commander's relief, did not interfere with its owner's diction. Tebbetts had evidently been given the question already. He started to talk at once, using the human tongue.

"We can detect from here any of the artificial lights you have, including the portables, though we might have trouble with beamed ones not pointed our way. We'd use regular equipment: photomultiplier mosaics behind an appropriate objective; anything you're likely to need could be set up in a few minutes. What do you want us to do?"

This question caught Barlennan by surprise. He had, in the few minutes since discussing the matter with his scientists, been growing more and more certain that the men would deny being able to detect such lights. Certainly if the commander had been a little more foresighted he would not have answered as he had. In fact, he was regretting what he said well before the words reached the station.

"You should have no trouble spotting our land-cruiser Kwembly; you already know its location better than I do, and its bridge lights would be on. Its two helicopters have just disappeared, and they normally carry lights. I'd like to have you scan the area within, say, two hundred miles of the Kwembly as carefully as you can for other lights, then tell both me and Dondragmer the positions of any you find. Would that take long?"

The message lag was quite long enough to let Barlennan realize how he had slipped. There was nothing to be done about it now but to hope, though that word is a bad translation of the nearest possible Mesklinite att.i.tude. The answer did cause him to brighten up a little; maybe the slip hadn't been too serious: as long as the human beings didn't find more than two other lights near the Kwemhly!

"I'm afraid I was thinking merely of detecting lights," said Tebbetts. "Pinpointing the sources will be harder, especially from here. I'm pretty sure we can solve your problem if your missing helis are shining their lights. If you think they may have crashed, I shouldn't think there'd be much chance of light, but I'll get right to it."

"How about their power plants?" asked Barlennan, determined to learn the worst now that he had started. "Aren't there other radiations than light given off in nuclear reactions?"

By the time this question reached the station Tebbetts had left, according to his promise; fortunately Benj was able to supply the answer. The information happened to be basic to the Project, which had been carefully explained to him right after his arrival.

"The fusion converters give off neutrinos which we can detect, but we can't spot their source exactly," he told the commander. "That's what the shadow satellites are for. They detect neutrinos, which are practically all coming from the sun. The power plants on Dhrawn and up here don't count for much against that, even if it isn't much of a sun. The computers keep track of where the satellites are and especially whether the planet is between a given one and the sun, so there's a measure of the neutrino absorption through different parts of the planet. In a few years we hope to have a statistical X ray of Dhrawn. Maybe that isn't a good a.n.a.logy for you: I mean a good idea of the density and composition of the planet's insides. They're still arguing, you know, whether Dhrawn should be called a planet or a star or whether the extra heat is from hydrogen fusion in the middle or radioactivity near the surface.

"But I'm sure as can be that they couldn't find your missing fliers from their neutrino emission, even if their converters are still on."

Barlennan managed to conceal his glee at this news; he merely answered, "Thanks. We can't have everything. I take it you'll tell me when your astronomer finds anything, or when he is sure he'll find nothing; I'd like to know if I have to stop counting on that. I'm through talking for now, Benj, but call here if anything comes up on either the fliers or those friends of yours. After all, I'm concerned about them, though perhaps not the way you are about Beetchermarlf. Takoorch is the one I remember." Barlennan, having had more direct contact with human beings and more selfish reasons to develop such skills, had been able to read more accurately between the lines of Benj's talk and obtain a more nearly correct picture of the boy's feelings than Dondragmer had. It would, he was sure, be useful; but he put it from his mind as he turned away from the communicator.

"That could be both better and worse," he remarked to the two scientists. "It's certainly just as well we didn't set up that blinker system for night communication ; they'd have seen us certainly."

"Not certainly," objected Deeslenver. "The human said they could spot such lights but there was no suggestion that they made a habit of looking for them. If it takes instruments, I'd bet the instruments are busy on more important thing."

"So would I, if the stakes weren't so high," returned Barlennan. "Anyway, we wouldn't dare use it now because we know they'll be looking this way with the best machines they have. We just asked them to."

"But they won't be looking here. They'll be searching the neighborhood of the Kwembly, millions of cables from here."

"Think of yourself back home looking up at Toorey. If you were supposed to examine one part of it closely with a telescope, how much of a slip would it take to make you glance at another?"

Deeslenver conceded the point with a gesture.

"Then we either wait for sunrise, or fly a special if we want to use the Esket as you suggested. I admit I haven't thought of anything else. I haven't even thought of what we might do there which would make a good test."

"It shouldn't matter too much. The real question would be how soon, and how accurately and completely, the human beings do report whatever we set up for them to see. I'll think of something in the next couple of hours. Aren't you researchers setting up for a flight to leave soon, anyway?"

"Not that soon," said Bendivence. "Also, I don't agree with you that details don't matter. You don't want them to get the idea that uv could possibly have anything to do with what they see happen at the Erket. They certainly aren't stupid."

"Of course. I didn't mean that they should. It will be something natural, making full allowance for the fact that the human beings know even less than we do about what's natural on this world. You get back to the labs and tell everyone who has equipment to get onto the Dada that departure time has been moved ahead. I'll have a written message for Destigmet in two hours."

"All right." The scientists vanished through the door, and Barlennan followed them more slowly. He was just beginning to realize how valid Bendivence's point was. What could be made to happen, in range of one of the Esket's vision transmitters, which would not suggest that there were Mesklinites in the neighborhood but which would attract human interest and tempt the big creatures to edit their reports? Could he think of such a thing without knowing why the reports were being held up? Or, for that matter, without being quite sure that they were? It was still possible that the delay on the Kwembly matter had been a genuine oversight; as the young human had suggested, each person might have thought that someone else had attended to the matter. To Barlennan's sailor's viewpoint this smacked of gross incompetence and inexcusable disorganization, but it would not be the first time he had suspected these qualities in human beings; not as a species, of course, but on an individual basis.

The test certainly had to be made, and the Esker' transmitters might surely be tools for the purpose. As far as Barleunan knew, the transmitters were still active. Naturally, care had been taken that no one enter their field of view since the "loss" of the cruiser, and it had been long since any human being had made mention of them. They would have been shuttered rather than avoided, since this would obviously have left the Mesklinites at the place much greater freedom of action; but the idea of the shutters had not occurred until after Destigmet had departed with his instructions to set up a second Settlement unknown to the human beings.

As Barlennan remembered, one of the transmitters had been at the usual spot on the bridge, one in the laboratory, one in the hangar where the helicopters were kept. The helicopters had been carefully arranged to be out on routine flights when the "catastrophe" occurred; and the fourth transmitter was in the life-support section, though not covering the entrance. It had been necessary to take much of the equipment from this chamber, of course.

With all the planning, the situation was still inconvenient; having the lab and life rooms out of bounds or at best accessible only with the greatest care, had caused Destigmet and his first officer, Kabremm, much annoyance. They had more than once requested permission to shutter the sets, since the technique had been invented. Barlennan had refused, not wanting to call human attention back to the Esket; now, well, maybe the same net could take two fish. The sudden blanking of one or perhaps of all four of those screens would certainly be noticed from above. Whether the humans would feel any inclination to hide the event from the Settlement there was no way of telling; one could only try.

The more he thought it over the better the plan sounded. Barlennan felt the glow familiar to every intelligent being, regardless of species, who has solved a major problem una.s.sisted. He enjoyed it for fully half a minute. At the end of that time, another of Guzmeen's runners caught up with him.

"Commander!" The messenger fell into step beside him in the nearly dark corridor. "Guzmeen says that you should come back to Communications at once. One of the human beings, the one called Mersereau, is on the screen. Guz says he ought to be excited, but isn't, because he's reporting something going on at the Esket-something is moving in the laboratory!"

10: WEIGHTED DATA.

Keeping in phase with Barlennan as he switched directions took some doing but the messenger managed it. The commander took his continued presence for granted.

"Any further details? When, or what was moving?"

"None, sir. The man simply appeared on the screen without any warning. He said, *Something is happening at the Esket. Tell the commander.' Guzmeen ordered me to bring you back on hurricane priority, so I didn't hear any more."

"Those were his exact words? He used our language?"

"No, it was the human speech. His words werea" the runner repeated the phrase, this time in the original tongue. Barlennan could read no more into the words than had been implicit in the translation.

"Then we don't know whether someone slipped up and was seen, or dropped something into the field of the lens, or-"

"I doubt the first, sir. The human could hardly have failed to recognize a person."

"I suppose not. Well, some sort of detail should be in by the time we get back there."

There wasn't, however. Boyd Mersereau was not even on the screen by the time Barlennan reached Communications. More surprising, neither was anyone else. The commander looked at Guzmeen suspiciously; the communication of ficer gave the equivalent of a shrug. "He just went, sir, after that one sentence about the lab."

Barlennan, mystified, squeezed the "attention" control.

But Boyd Mersereau had other concerns on his mind. Most, but not quite all, involved events on Dhrawn, not the Esket. There were a few matters much closer to home than the giant star-planet.

The chief of these was the cooling down of Aucoin. Aucoin was annoyed at not having been brought into the exchanges between Dondragmer and Katini, and the captain and Tebbetts. He was inclined to blame young Hoffman for going ahead with policy-disturbing matters without official approval. However, he did not want to say anything which would annoy Easy. He regarded her, with some justification, as the most nearly indispensable member of the communications group. In consequence, Mersereau and others suffered fallout from the administrator's deflected ire.

This was not too serious, as far as Boyd was concerned. He had years ago cla.s.sified the pacifying of administrators along with shaving as something which took time but did not demand full attention; it was worth doing at all only because it was usually less trouble in the long run. The real attention-getter, the thing which kept even news from the Esket in the background, was the state of affairs at the Kwembly.

Left alone Boyd might have been moderately concerned, but only moderately. The missing Mesklinites weren't close personal friends of his. He was civilized enough to be bothered by their loss as much as if they had been human, though they were not his brothers or sons.

The Kwembly herself was a problem, but a fairly routine one. Land-cruisers had been in trouble before; so far they had always been extricated sooner or later. All in all, Mersereau would have been merely absorbed, not bothered, if left to himself.

He was not left to himself. Benj Hoffman felt strongly about the whole matter and had a way of making his feelings clear, not entirely by talking, though he was perfectly willing to talk. Even when silent he radiated sympathy. Boyd would find himself discussing with Dondragmer the progress of the melting-out plan or the chances of another flood in terms of their effect on the missing helmsmen, rather than with reasonable and proper professional detachment. It was annoying. Beetchermarlf and Takoorch, even Kervenser, just weren't that central to the work; the real question was the survival of the crew. Benj, whether sitting silently beside him or interjecting a few remarks, somehow managed to make objectivity seem callous. Mersereau had no defense against that particular effect; Easy knew perfectly well what was going on, but she did not interfere because she almost entirely shared her son's feelings. Partly because of her s.e.x and partly because of her own background she felt a very intense sympathy for Beetchermarlf and his companion, and even for Takoorch. She had been caught in a rather similar situation some twenty-five years before, when a concatenation of errors had stranded her in an unmanned research vessel on a high-temperature, high-pressure planet.

In fact, she went further than Benj would have dared. Dondragmer might and probably would have sent a ground party to the site of Reffel's disappearance, since the location was fairly well known; it was unlikely that he would have risked sending one of his three remaining communicators along. Yet Easy, partly by straightforward arguments of her own and partly by using her son's techniques to swing Mersereau to her view, convinced the captain that the risk of not taking the communicator along would be even greater. This discussion, among many others, was conducted in Aucoin's absence; even as he argued with Dondragmer, Mersereau was wondering how he would justify the step to planner Aucoin. Nevertheless, he argued on Easy's side, as Benj suppressed a grin in the background.

With this claim on his attention, Boyd scarcely noticed the call from another observer that a couple of objects were moving across the screen which showed the Esket*s laboratory. He switched channels briefly and pa.s.sed the word on to the Settlement, cutting back to the Kwemb/y without waiting for the end of the communication cycle. Later he claimed that he had never been really conscious of the Esket's name in the report; he had thought of the message as a routine report from some observer or other; his princ.i.p.al feeling had been one of irritation at being distracted. Some people would have snapped at the observer; Boyd, being the person he was, had taken what seemed to him the quickest and simplest way of disposing of the interruption. He had then quite genuinely forgotten the incident.