Elliott Grosvenor had just said to Korita, the archaeologist aboard the Space Beagle: "Your brief outline of cyclic history is what I've been looking for. I did have some knowledge of it, of course. It wasn't taught at the Nexial Foundation, since it's a form of philosophy. But a curious man picks up odds and ends of information." 

They had paused at the "glass" room on Grosvenor's floor. It wasn't glass, and it wasn't, by strict definition, a room. It was an alcove of an outer wall corridor, and the "glass" was an enormous curving plate made from a crystallized form of one of the Resistance metals. It was so limpidly transparent as to give the illusion that nothing at all was there—beyond was the vacuum and darkness of space. 

Korita half-turned away, then said, "I know what you mean by odds and ends. For instance, I've learned just enough about Nexialism to envy you the mind trainings you received." 

At that moment, it happened —Grosvenor had noticed absently that the ship was almost through the small star cluster it had been traversing. Only a score of suns were still visible of the approximately five thousand stars that made up the system. The cluster was one of a hundred star groups accompanying Earth's galaxy through space. 

Grosvenor parted his lips to say, "I'd certainly like to talk to you again, Mr. Korita." — He didn't say it. A slightly blurred double image of a woman wearing a feathered hat was taking form in the glass directly in front of him. The image flickered and shimmered. Grosvenor felt an unnormal tensing of the muscles of his eyes. For a moment, his mind went blank. That was followed rapidly by sounds, flashes of light, a sharp sensation of pain —hypnotic hallucinations! The awareness was like an electric shock. The recognition saved him. He whirled, stumbled over the unconscious body of Korita, and then he was racing along the corridor.  

As he ran, he had to look ahead in order to see his way. And yet, he had to keep blinking to break the pattern of the light flashes that came at his eyes from other images on the walls. At first, it seemed to him that the images were everywhere. Then, he noticed that the woman-like shapes — some oddly double, some single —occupied transparent or translucent wall sections. There were hundreds of such reflecting areas, but at least it was a limitation. At least he knew where he had to run fastest, and where he could slow down. 

He saw more men. They lay at uneven intervals along his line of flight. Twice, he came upon conscious men. One stood in his path with unseeing eyes, and did not move or turn as Grosvenor sped by. The other man let out a yell, grabbed his vibrator, and fired it. The tracer beam flashed on the wall beside Grosvenor. Grosvenor whirled, and lunged forward, knocking the man to the floor. The man —a Kent supporter  — glared at him malignantly. "You damned spy!" he said harshly. "We'll get you yet." Grosvenor didn't pause. He reached his own department safely, and immediately took refuge in the film recording room. There he turned a barrage of flashing lights against the floors, the walls and the ceiling. The images were instantly eclipsed by the strong light superimposed upon them. 

Quickly, Grosvenor set to work. One fact was already evident. This was mechanical visual hypnosis of such power that he had saved himself only by keeping his eyes averted, but what had happened was not limited to vision. The image had tried to control him by stimulating his brain through his eyes. He was up to date on most of the work that men had done in that field, and so he knew — though the attacker apparently did not — that control by an alien of a human nervous system was not possible except with an encephalo-adjuster or its equivalent. 

He could only guess, from what had almost happened to him, that the other men had been precipitated into deep sleep trances, or else they were confused by hallucinations and were not responsible for their actions. His hope was that the woman-like beings — the enemy seemed to be feminine — were operating at a distance of several light-years and so would be unable to refine their attempts at domination. 

His job was to get to the control room and turn on the ship's energy screen. No matter where the attack was coming from, whether from another ship or actually from a planet, the energy screen should effectively cut off any carrier beams they might be sending. 

With frantic fingers, Grosvenor worked to set up a mobile unit of lights. He needed something that would interfere with the images on his way to the control room. He was making the final connection when he felt an unmistakable sensation, a slight giddy feeling — that passed almost instantly. Such feelings usually occurred during a considerable change of course and were a result of readjustment of the anti-accelerators. Had the course actually been changed? He couldn't stop to make sure. Hastily, Grosvenor carried his arrangement of lights to a power-driven loading vehicle in a nearby corridor, and placed it in the rear compartment. Then he climbed on and headed for the elevators. 

He guessed that altogether ten minutes had gone by since he had first seen the image. 

He took the turn into the elevator corridor at twenty-five miles an hour, which was fast for these comparatively narrow spaces. In the alcove opposite the elevators, two men were wrestling each other with a life and death concentration. They paid no attention to Grosvenor but swayed and strained and cursed. Their labored breathing was a loud sound in the confined area. Their single-minded hatred of each other was not affected by Grosvenor's arrangement of lights. Whatever world of hallucination they were in, it had "taken” profoundly. 

Grosvenor whirled his machine into the nearest elevator and started down. He was beginning to let himself hope that he might find the control room deserted. The hope died as he came to the main corridor. It swarmed with men. Barricades had been flung up, and there was an unmistakable odor of ozone. Vibrators fumed and fussed. Grosvenor peered cautiously out of the elevator, trying to size up the situation. It was visibly bad. The two approaches to the control room were blocked by scores of overturned loading-mules. Behind them crouched men in military uniform. Grosvenor caught a glimpse of Captain Leeth among the defenders and, on the far side, he saw Director Morton behind the barricade of one of the attacking groups. That clarified the picture slightly. Suppressed hostility had been stimulated by the images. The scientists were fighting the military whom they had always unconsciously hated. The military, in turn, was suddenly freed to vent its contempt and fury upon the despised scientists. 

It was, Grosvenor knew, not a true picture of their feeling for each other. The human mind normally balanced innumerable opposing impulses so that the average individual might live his life-span without letting one feeling gain important ascendancy over the others. That intricate balance had now been upset. The result threatened disaster to an entire expedition of human beings, and promised victory to an enemy whose purpose could only be conjectured. Whatever the reason, the way to the control room was blocked. Reluctantly, Grosvenor retreated again to his own department. 

Carefully, but quickly, he tuned a wall communicator plate to the finely balanced steering devices in the fore part of the Space Beagle. The sending plate there was focused directly along a series of hair-line sights. The arrangement looked more intricate than it was. As he brought his eyes to the sights, Grosvenor saw that the ship was describing a slow curve that, at its climax, would bring it to bear directly on a bright white star. A servo-mechanism had been set up to make periodic adjustments that would hold it on its course. 

Still he was more puzzled than alarmed. He shifted the viewer over to the bank of supplementary instruments. According to the star's spectral type, magnitude and luminosity, it was just over four light-years distant. The ship's speed was up to a light year every five hours. Since it was still accelerating, that would increase on a calculable curve. He estimated roughly that the vessel would reach the vicinity of the sun in approximately eleven hours. Grosvenor's thought suffered a pause at that point. With a jerky movement, he shut off the communicator. He stood there, shocked, but not incredulous. Destruction could be the purpose of the deluded person who had altered the ship's course. If so, there was just about ten hours in which to prevent catastrophe. 

Even at that moment, when he had no clear plan, it seemed to Grosvenor that only an attack on the enemy, using hypnotic techniques, would effectively do the job. Meanwhile —He stood up decisively. It was time for his second attempt to get into the control room. 

He needed something that would cause direct stimulation to brain cells. There were several devices that could do that. Most of them were usable for medical purposes only. The exception was the encephalo-adjuster. Though important medically, it had other uses as well. It took Grosvenor several minutes to set up one of his adjusters. Testing it consumed still more time; and, because it was such a delicate machine, he had to fasten it to his loading vehicle with a cushion of springs around it. Altogether, the preparation required thirty-seven minutes. 

The presence of the encephalo-adjuster made it necessary for him to keep down the speed of his vehicle as he headed for the control room. The enforced slow-down irked him, but it also gave him an opportunity to observe the changes that had taken place since the first moment of attack. He saw only an occasional unconscious body. Grosvenor guessed that most of the men who had fallen into deep trance sleeps had awakened spontaneously. Such awakenings were a common hypnotic phenomenon. Now they were responding to other stimuli on the same chance basis. Unfortunately — although that also was to be expected — it seemed to mean that long-suppressed impulses controlled their actions. 

A highly developed mind — human or alien — was a built-up structure, an intricate balance of positive and negative excitations. The more superficial impulses, having considerable freedom of expression at all times, could not endanger the whole structure. The suppressed impulses, suddenly given free rein, acted like water breaking through a dam. So men who, under normal circumstances merely disliked each other mildly, all in an instant had their dislike change to a murderous hatred. The deadly factor was that they would be unaware of the change. For the mind could be tangled without the individual being aware of it. It could be tangled by bad environmental association, or by the attack that was now being made against a shipload of men. In either case, each person carried on as if his new beliefs were as soundly based as his old ones. 

Grosvenor opened the elevator door on the control room level, and then drew back hastily. A heat projector was pouring flame along the corridor, the metal walls burning with a harsh, sizzling sound. Within his narrow field of vision, three men lay dead. As he waited, there was a thunderous explosion, and instantly, the flames stopped, blue smoke hazed the air, and there was a sense of suffocating heat. Within seconds, both the haze and the heat were gone. The ventilating system was still working. 

He peered out cautiously. At first sight, the corridor seemed deserted. Then he saw Morton, half-hidden in a protective alcove less than a score of feet away, and at almost the same moment, the Director saw him and beckoned him over. Grosvenor hesitated, then realized he had to take the risk. He pushed his vehicle through the elevator doorway, and darted across the intervening space. The Director greeted him eagerly as he came up. 

"You're just the man I want to see," he said. "We've got to get control of the ship away from Captain Leeth before Kent and his group organize their attack." 

Morton's gaze was calm and intelligent. He had the look of a man fighting for the right. Nor did it seem to occur to him that an explanation for his statement was required. The Director went on: 

"We'll need your help, particularly against Kent. They're bringing up some chemical stuff I've never seen before. So far, our fans have blown it right back at them, but they're setting up fans of their own. Our big problem is, will we have time to defeat Leeth before Kent can bring his forces to bear?" 

Time was also Grosvenor's problem. Unobtrusively, he brought his right hand up to his left wrist and touched the activating relay that controlled the directional sending plates of the adjuster. He pointed the plates at Morton as he said, "I've got a plan, sir, and I think it might be effective against the enemy." 

He stopped. Morton was looking down. The Director said, "You've brought along an adjuster, and it's on. What do you expect from that?" 

Grosvenor's first tense reaction yielded to a need for a suitable answer. He had hoped that Morton would not be too familiar with adjusters. With that hope blasted, he could still try to use the instrument, though without the initial advantage of surprise. He said in a voice that was taut in spite of himself, "That's it. It's this machine I want to use." 

Morton hesitated, then said, "I gather from the thoughts coming into my mind that you're broadcasting —" He stopped. Interest quickened in his face. "Say," he said presently, "that's good. If you can put over the notion that we're being attacked by aliens —" He broke off. His lips pursed. His eyes narrowed with calculation. He said, "Captain Leeth has twice tried to make a deal with me. Now, we'll pretend to agree, and you go over with your machine. We'll attack the moment you signal us." He explained with dignity, "You understand, I would not consider dealing with either Kent or Captain Leeth except as a means to victory. You appreciate that, I hope?" 

Grosvenor found Captain Leeth in the control room. The commander greeted him with stiff-backed friendliness. "This fight among the scientists," he said earnestly, "has placed the military in an awkward position. We've got to defend the control room and the engine room and so perform our minimum duty to the expedition as a whole." He shook his head gravely. "It's out of the question, of course, that either of them be allowed to win. In the final issue, we of the military are prepared to sacrifice ourselves to prevent the victory of either group."  

The explanation startled Grosvenor out of his own purpose. He had been wondering if Captain Leeth was responsible for aiming the ship directly at a sun. Here was at least partial confirmation. The commander's motivation seemed to be that victory for any group but the military was unthinkable. With that beginning, it was probably only a tiny step to the concept that the whole expedition must be sacrificed. Unsuspected hypnosis had stimulated the step.  

Casually, Grosvenor pointed the directional sender of the adjuster at Captain Leeth. . . . Brain waves, minute pulsations transmitted from axon to dendrite, from dendrite to axon, always following a previously established path depending on past associations — a process that operated endlessly among the ninety million neuron cells of a human brain. Each cell was in its own state of electro-colloidal balance, an intricate interplay of tension and impulse. Only gradually, over the years, had machines been developed that could detect with some degree of accuracy the meaning of the energy flow inside the brain. 

The earliest encephalo-adjuster was an indirect descendant of the famous electro-encephalograph. But its function was the reverse of that first device. It manufactured artificial brain waves of any desired pattern. Using it, a skillful operator could stimulate any part of the brain, and so cause thoughts, emotions, and dreams, and bring up memories from the individual's past. It was not in itself a controlling instrument. The subject maintained his own ego. However, it could transmit the mind-impulses of one person to a second person. Since the impulses varied according to the sender's thoughts, the recipient was stimulated in a highly flexible fashion. 

Unaware of the presence of the adjuster, Captain Leeth did not realize that his thoughts were no longer quite his own. He said, "The attack being made on the ship by the images makes the quarrel of the scientists traitorous and unforgivable." He paused, then said thoughtfully, "Here's my plan." The plan involved heat projectors, muscle-straining acceleration, and partial extermination of both groups of scientists. Captain Leeth failed even to mention the aliens, nor did it seem to occur to him that he was describing his intentions to an emissary of what he regarded as the enemy. He finished, "Where your services will be important, Mr. Grosvenor, is in the science department. As a Nexialist, with a coordinative knowledge of many sciences, you can play a decisive role against the other scientists —" 

Weary and disheartened, Grosvenor gave up. The chaos was too great for one man to overcome. Everywhere he looked were armed men. Altogether, he had seen a score or, more dead bodies. At any moment the uneasy truce between Captain Leeth and Director Morton would end in a burst of projector fire. And even now he could hear the roaring of the fans where Morton was holding off Kent's attack. He sighed as he turned back to the Captain. "I'll need some equipment from my own department," he said. "Can you pass me through to the rear elevators? I can be back here in five minutes." 

As he guided his machine into the backdoor of his department a few minutes later, it seemed to Grosvenor that there was no longer any doubt about what he must do. What had seemed a far-fetched idea when he first thought of it was now the only plan he had left. He must attack the alien women through their myriad images, and with their own hypnotic weapons. 

As he made his preparations, Grosvenor kept wiping the perspiration from his face, and yet it was not warm. The room temperature stood at normal. Unwillingly, he  paused finally to analyze his anxiety. He just didn't, he decided, know enough about the enemy. It was not sufficient that he had a theory about how they were operating. The great mystery was an enemy who had curiously woman-like faces and bodies, some partly doubled, some single. Uneasily, Grosvenor tried to imagine how Korita might analyze what was happening. In terms of cyclic history, what stage of culture could these beings be in?  — The fellahin stage, he thought finally. It was actually an inevitable conclusion. A race that controlled hypnotic phenomena as did this one, would be able to stimulate each other's minds, and so would have naturally the kind of telepathy that human beings could obtain only through the encephalo-adjuster. Such beings would flash through the early stages of their culture, and arrive at the fellah stage in the swiftest possible time. The ability to read minds without artificial aids would stultify any culture. 

Swiftly, Grosvenor went back mentally to the various civilizations of Earth history that had run their courses, apparently exhausted themselves, and then stagnated into fellahdom— Babylon, Egypt, China, Greece, Rome, and parts of west Europe. Then there were the Mayan, Toltec and Aztec cultures of early America, the East Indies, Ceylon and the mid-Pacific islanders, with their strange relics of by-gone glories — endlessly, the pattern repeated itself. Fellah folk resented newness and change, resisted it, and fought it blindly. The coming of this ship could have stirred these beings to just that kind of resistance. It seemed to Grosvenor that he had to act as if the analysis was correct. He had no other hypothesis. With such a theory as a starting point, he could try to obtain verification from one of the images. With pursed lips, he considered how it might be done. They wanted to conquer him also, of that he was sure, so accordingly, he must appear to play into their hands. A quick glance at the chronometer tensed him, as he saw he had less than seven hours to save the ship! 

Hastily, he focused a beam of light through the encephalo-adjuster. With quick movements, he set a screen in front of the light, so that a small area of glass was thrown into shadow except for the intermittent light that played on it from the adjuster. 

Instantly, an image appeared. It was one of the partially doubled ones, and because of the encephalo-adjuster, he was able to study it in safety. That first clear look astounded him. It was only vaguely humanoid, and yet it was understandable how his mind had leaped to the woman identification earlier. Its overlapping double face was crowned with a neat bun of golden feathers, but its head, though unmistakably bird-like now, did have a human appearance. There were no feathers on its face, which was covered with a lace-work of what seemed to be veins. The human appearance resulted from the way those veins had formed into groups. They gave the effect of cheeks and nose. The second pair of eyes, and the second mouth, were in each case nearly two inches above the first. They almost made a second head, which was literally growing out of the first. There was also a second pair of shoulders, with a doubled pair of short arms that ended in beautifully delicate, amazingly long hands and fingers—and the over-all effect was still feminine. Grosvenor found himself thinking that the arms and fingers of the two bodies would be likely to separate first; then the second body would be able to help support its weight. Parthenogenesis, he thought. Here were genuine hymenopters. 

The image in the wall before him showed vestigial wings, and tufts of feathers were visible at the wrists. It wore a bright blue tunic over an astonishingly straight and superficially human-like body. If there were other vestiges of a feathery past, they were hidden by the clothing. What was clear was that this bird didn't and couldn't fly under its own power. 

Grosvenor completed his study swiftly. His first move seemed as obvious as it was necessary. Somehow, he must convey to these beings that he would let himself be hypnotized in exchange for information. Tentatively, he drew a picture of the image and of himself on a blackboard. Forty-seven precious minutes and scores of drawings later, the "bird" image suddenly faded from the wall. And a city scene appeared in its place. It was not a large community, and his first view of it was from a high vantage point. He had an impression of very tall, very narrow buildings clustered so close together that all the lower reaches must be lost in gloom for most of each day. Grosvenor wondered, in passing, if that might possibly reflect nocturnal habits in some primeval past. His mind leaped on. He ignored individual buildings in his desire to obtain a whole picture. Above everything else, he wanted to find out the extent of their machine culture, how they communicated, and if this was the city from which the attack on the ship was being launched. 

He could see no machines, no aircraft, no cars, nor anything corresponding to the interstellar communication equipment used by human beings. On Earth, such communication required stations spaced over many square miles of land. It seemed likely, therefore, that this was not the origin of the attack. He had guessed, of course, that they would not show him anything vital. Even as he made his negative discovery, the view changed. He was no longer on a hill, but on a building near the center of the city. Whatever was taking that perfect color picture moved forward, and he looked down over the edge. His primary concern was with the whole scene. Yet he found himself wondering how they were showing it to him. The transition from one scene to another had been accomplished in the twinkling of an eye. Less than a minute had passed since his blackboard illustration had finally made known his desire for information. 

That thought, like the others, was a flashing one. Even as he had it, he was gazing avidly down the side of the building. The space separating it from the nearby structures seemed no more than ten feet. But now he saw something that had not been visible from the hillside. The buildings were connected on every level by walks only inches wide. Along these moved the pedestrian traffic of the bird city. Directly below Grosvenor, two individuals strode towards each other along the same narrow walk, seemingly unconcerned by the fact that it was a hundred feet or more to the ground. They passed casually, easily. Each swung his outside leg wide around the other, caught the walk, bent his inside leg far out, and then they were by, without having broken pace. There were other people on other levels going through the same intricate maneuvers in the same nonchalant manner. Watching them, Grosvenor guessed that their bones were thin and hollow, and that they were lightly built. 

The scene changed again, and then again. It moved from one section of the street to another. He saw, it seemed to him, every possible variation of the reproductive condition. Some were so far advanced that the legs and arms and most of the body were free. Others were as he had already seen them. In every instance, the "parent" seemed unaffected by the weight of the new body. 

Grosvenor was trying to get a glimpse inside one of the dim interiors of a building when the picture began to fade from the wall. In a moment, the city had disappeared completely. In its place grew the double image. The image-fingers pointed at the encephalo-adjuster. Its motion was unmistakable. It had fulfilled its part of the bargain. It was time for him to fulfill his. Its naive expectation that he would do so was typically fellah. Unfortunately, he had no alternative but to carry out his "obligation." 

"I am calm and relaxed," said Grosvenor's recorded voice. "My thoughts are clear. What I see is not necessarily related to what I am looking at. What I hear may be meaningless to the interpretive centers of my brain, but I have seen their city as they think it is. Whether what I actually see and hear makes sense or nonsense, I remain calm, relaxed, and at ease . . ." 

Grosvenor listened carefully to the words, and then nodded. The time might come, of course, when he would not consciously hear the message. But it would be there. Its patterns would impress ever more firmly on his mind. Still listening, he examined the adjuster for the last time, and all was as he wanted it. Carefully, he set the automatic cut-off for five hours. At the end of that time, unless he were dead, the limited cross connection would be broken. He would have preferred his first break to be in seconds, or minutes, but what he was about to do was not merely a scientific experiment — it was a life and death gamble. Ready for action, he put his hand on the control dial, and there he paused. For this was the moment. Within a few seconds the group mind of perhaps thousands of individual birdfolk would be in "possession" of parts of his nervous system. They would undoubtedly try to control him as they were controlling the other men on the ship. 

He was fairly positive that he would be up against a group of minds working together. He had seen no machines; not even a wheeled vehicle, that most primitive of mechanical devices. For a short time, he had taken it for granted that they were using television-type cameras. Now, he guessed that he had seen the city through the eyes of individuals, as with these beings, telepathy was a sensory process as sharp as vision itself. The enmassed mindpower of millions of bird-people could hurdle light years of distance. They didn't need machines. 

On Earth, and elsewhere, nearly all lower order life forms that reproduced by parthenogenesis worked together in a curious unity of purpose. It suggested an interrelation that could dispense with actual physical contact. 

Fellahdom must be a long-standing condition of this race. There would be no doubt in the mind of the individual about the "truth" of what it saw and heard and felt. It would be only too easy for them to settle into an inflexible pattern of existence. That pattern was now going to feel the sledgehammer impact of new ideas. He couldn't hope to foresee the result. 

Still listening to the recorder, Grosvenor manipulated the dial of the encephalo-adjuster, and slightly modified the rhythm of his own thoughts. It had to be slight. Even if he had wanted to, he could not offer the aliens complete attunement. In those rhythmic pulsations lay every variation of sanity, unsanity, and insanity. He had to restrict his reception to waves that would register "sane" on a psychologist's graph. 

The adjuster superimposed them on a beam of light, which in turn shone directly on the image. If the individual "behind" the image was affected by the pattern in the light, it didn't show it yet. Grosvenor did not expect overt evidence, and so he was not disappointed. He was convinced that the result would become apparent only in the changes that occurred in the patterns they were directing at him. And that, he was sure, he would have to experience with his own nervous system. . 

It was hard for him to concentrate on the image, but he persisted. The encephalo-adjuster began to interfere markedly with his vision, and still he stared steadily at the image. 

". . . I am calm and relaxed. My thoughts are clear . . ." 

One instant the words were loud in his ears, and the next, they were gone. In their stead was a roaring sound as of distant thunder. 

The noise faded slowly. It became a steady throbbing like the murmur in a large seashell. Grosvenor was aware of a faint light. It was far away, and had the hazy dimness of a lamp seen through thick fog. 

"I'm still in control," he assured himself. "I'm getting sense impressions through its nervous system. It's getting impressions through mine." 

He could wait. He could sit here and wait until the darkness cleared, until his brain started to make some kind of interpretation of the sense phenomena that were being telegraphed from that other nervous system. He could sit here and— 

He stopped. "Sit!" he thought. Was that what it was doing? He poised intent and alert. He heard a distant voice say, "Whether what I actually see and hear makes sense or nonsense, I remain calm—" The sound of his recorded voice relieved him anew. The danger would come if his body were forced away from that reassuring sound, and away from the encephalo-adjuster. Until that threatened, he could let the alien impressions seep into him. 

His nose began to itch. He thought: "They don't have noses; at least I didn't see any. Therefore, it's either my own nose, or a random stimulation." He started to reach up to scratch it, and felt a sharp pain in his stomach. He would have doubled up with the hurt of it if he had been able. He couldn't. He couldn't scratch his nose or put his hands on his abdomen. 

He realized then that the itch and the pain stimuli did not derive from his own body, nor did they necessarily have any corresponding meaning in the other's nervous system. Two highly developed life forms were sending signals to each other — he hoped that he was sending signals to it also—which neither could interpret. His advantage was that he had expected it. The alien, if it was fellah, and if Korita's theory was valid, hadn't and couldn't expect it. Understanding that, he could hope for adjustment. It could only become more confused. 

The itch went away, and the pain in his stomach became a feeling of satiation, as if he had eaten too much. A hot needle stabbed at his spine, digging at each vertebra. Half way down, the needle turned to ice, and the ice melted and ran in a freezing stream down his back. Something—a hand? a piece of metal? a pair of tongs?—snatched at a bundle of muscles in his arm, and almost tore them out by the roots. His mind shrieked with pain messages and he almost lost consciousness. 

Grosvenor was a badly shaken man when that sensation faded into nothingness. These were all illusions. No such things were happening anywhere, not in his body, not in that of the bird-being. His brain was receiving a pattern of impulses through his eyes, and was misinterpreting them. In such a relationship, pleasure could become pain, any stimulus could produce any feeling. He hadn't counted on the misinterpretations being so violent. 

He forgot that as his lips were caressed by something soft and squishy. A voice said, "I am loved—" Grosvenor rejected the meaning. "No, not loved." It was, he believed, his own brain again trying to interpret sense phenomena from a nervous system that was experiencing a reaction different from any comparable human emotion. Consciously, he substituted the words: "I am stimulated by . . ." —and then let the feeling run its course. In the end, he still didn't know what it was that he had felt. The stimulation was not unpleasant. His taste buds were titillated by a sense of sweetness, and his eyes watered. It was a relaxing process. A picture of a flower came into his mind. It was a lovely, red, Earth carnation, and thus could have no connection with the flora of the Riim world. "Riim!" He thought. His mind poised in tense fascination. Had that come to him across the gulf of space? In some irrational way, the name seemed to fit. Yet no matter what came through, a doubt would remain in his mind. 

The final series of sensations had all been pleasant. Nevertheless, he waited anxiously for the next manifestation. The light remained dim and hazy —then, once more his eyes seemed to water, his feet suddenly itched intensely. The sensation passed, leaving him unaccountably hot, and weighted by a suffocating lack of air. 

"False!" he told himself. "Nothing like that is happening." 

The stimulations ceased. Again there was only the steady throbbing sound, and the all-pervasive blur of light. It began to worry him. It was possible that his method was right and that, given time, he would eventually be able to exercise some control over a member, or a group of members of the enemy. Time was what he could not spare. Every passing second brought him a colossal distance nearer personal destruction. Out there—here (for an instant he was confused)—in space, one of the biggest and costliest ships ever built by men was devouring the miles at a velocity that had almost no meaning. 

He knew which parts of his brain were being stimulated. He could hear a noise only when sensitive areas at the side of the cortex received sensations. The brain surface above the ear, when titillated, produced dreams. And old memories. In the same way, every part of the human brain had long ago been mapped. The exact location of stimulation areas differed slightly for each individual, but the general structure, among humans, was always the same. 

The normal human eye was a fairly objective mechanism. The lens focused a real image on the retina. Judging by the pictures of their city, as transmitted by the Riim-folk, they also possessed objectively accurate eyes. If he could coordinate his visual centers with their eyes, he would receive dependable pictures. 

More minutes went by. He thought, in sudden despair: "Is it possible that I'm going to sit here the full five hours without ever making a useful contact?" For the first time, he questioned his good sense in committing himself so completely to this situation. When he tried to move his hand over to the control lever of the encephalo-adjuster, nothing seemed to happen. A number of vagrant sensations came, among them, unmistakably, the odor of burning rubber. For a third time, his eyes watered. And then, sharp and clear, a picture came. It flashed off as swiftly as it had flashed on. To Grosvenor, who had been trained by advanced tachistoscopic techniques, the after-image remained as vivid in his mind as if he had had a leisurely look. It seemed as if he were in one of the tall, narrow buildings. The interior was dimly lighted by the reflections from the sunlight that came through the open doors, as there were no windows. Instead of floors, the "residence" was fitted with catwalks. A few bird people were sitting on these walks. The walls were lined with doors, indicating the existence of cabinets and storage areas. 

The visualization both excited and disturbed him. Suppose he did establish a relationship whereby he was affected by its nervous system, and it by his. Suppose he reached the point where he could hear with its ears, see with its eyes, and feel to some degree what it felt. These were sensory impressions only. Could he hope to bridge the gap, and induce motor responses in the creature's muscles? Would he be able to force it to walk, turn its head, move its arms, and, generally, make it act as his body? The attack on the ship was being made by a group working together, thinking together, feeling together. By gaining control of one member of such a group, could he exercise some control over all? 

His momentary vision must have come through the eyes of one individual. What he had experienced so far did not suggest any kind of group contact. He was like a man imprisoned in a dark room with a hole in the wall in front of him covered with layers of translucent material. Through this filtered a vague light. Occasionally, images penetrated the blur, and he had glimpses of the outside world. He could be fairly certain that the pictures were accurate, but that did not apply to the sounds that came through another hole on a side wall, or the sensations that came to him through still other holes in the ceiling and floor. 

Humans could hear frequencies up to 20,000 a second. That was where some races started to hear. Under hypnosis, men could be conditioned to laugh uproariously when they were being tortured, and shriek with pain when tickled. Stimulation that meant pain to one life form, could mean nothing at all to another. 

Mentally, Grosvenor let the tensions seep out of him. There was nothing for him to do but to relax and wait. He waited. 

It occurred to him presently that there might be a connection between his own thoughts and the sensations he received. That picture of the inside of the building—what had he thought just before it came? Principally, he recalled, he had visualized the structure of the eye. The connection was so obvious that his mind trembled with excitement. There was another thing, also. Until now, he had concentrated on the notion of seeing and feeling with the nervous system of the individual. Still the realization of his hopes depended on his establishing contact with, and control of, the group of minds that had attacked the ship. 

He saw his problem, suddenly, as one that would require control of his own brain. Certain areas would have to be virtually blacked out, kept at minimum performance levels. Others must be made extremely sensitive, so that all incoming sensations found it easier to seek expression through them. As a highly trained auto-hypnotic subject, he could accomplish both objectives by suggestion. Vision came first, of course. Then muscular control of the individual, through whom the group was working against him. 

Flashes of colored light interrupted his concentration. Grosvenor regarded them as evidence of the effectiveness of his suggestions. He knew that he was on the right track when his vision cleared suddenly, and stayed clear. The scene was the same. His control still sat on one of the roosts inside one of the tall buildings. Hoping fervently that the vision was not going to fade, Grosvenor began to concentrate on moving the Riim's muscles. The trouble was that the ultimate explanation of why a movement could occur at all was obscure. His visualization had to be on a level that was already gross. Nothing happened. Shocked but determined, Grosvenor tried symbol hypnosis, using a single cue word to cover the entire complex process. 

Slowly, one of the attenuated arms came up. Another cue, and his control stood up cautiously. Then he made it turn its head. The act of looking reminded the bird-being that that drawer and that cabinet and that closet were "mine." The memory barely touched the conscious level. The creature knew its own possessions and accepted the fact without concern. 

Grosvenor had a hard time fighting down his excitement. With tense patience, he had the bird-being get up from a sitting position, raise its arms, lower them, and walk back and forth along the roost. Finally, he made it sit down again. He must have been keyed up, his brain responsive to the slightest suggestion. Because he had barely started to concentrate again when his whole being was flooded by a message that seemed to affect every level of his thought and feeling. More or less automatically, Grosvenor translated the anguished thoughts into familiar verbalisms. 

". . . The Cells are calling, calling. The cells are afraid. Oh, the cells know pain! There is darkness in the Riim world. Withdraw from the being—far from Riim . . . Shadows, darkness, turmoil . . . The cells must reject him . . . but they cannot. They were right to try to destroy the being who came out of the great dark. The night deepens. All cells withdraw . . . but they cannot . . . " 

Grosvenor though t exultantly: "I've got them!" After a minute of tremendous excitement, he grew sober. His problem was greater than theirs. If he broke his connection with them, they would be free. By avoiding him thereafter, they could go on to achieve the purpose of their disruptive attack . . . destruction of the Space Beagle. He would still have the problem of overcoming Morton and the others. He had no alternative but to go on with his plan. 

He concentrated first on what seemed the most logical intermediate stage:—the transfer of control to another alien. The choice, in the case of these beings, was obvious. 

"I am loved!" he told himself, deliberately producing the sensation that had confused him earlier. "I am loved by my parent body, from which I am growing to wholeness. I share my parent's thoughts, but already I see with my own eyes, and know that I am one of the group . . . " 

The transition came suddenly, as Grosvenor had expected it might. He moved the smaller, duplicate fingers. He arched the fragile shoulders. Then he oriented himself again to the parent Riim. The experiment was so completely satisfactory that he felt ready for the bigger jump that would take him into association with the nervous system of a more distant alien. That, also, proved to be a matter of stimulating the proper brain centers. Grosvenor came to awareness standing in a wilderness of brush and hill. Directly in front of him was a narrow stream, and beyond it, an orange sun rode low in a dark purple sky that was spotted with fleecy clouds. Grosvenor made his new control turn completely around. He saw that a small roost building, the only habitation in sight, nestled among the trees farther along the stream. He walked toward the building and looked inside. In the dim interior, he made out several roosts, one with two birds sitting on it, both with eyes closed. It was quite possible, he decided, that they were participating in the group assault on the Space Beagle. 

From there, by a variation of the stimulus, he transferred his control to an individual on a part of the planet where it was night. The transition this time was even faster. He was in a lightless city, with ghostly buildings and catwalks. Swiftly, Grosvenor moved on to association with other nervous systems. He had no clear idea why the "rapport" was established with one Riim, and not with another who fitted the same general requirement. It could be that the stimulations affected some individuals slightly faster than it affected others. It was even possible that these were descendants or body-relatives of original parent-control. When he had been associated with more than two dozen Riim all over the planet, it seemed to Grosvenor that he had a good, over-all impression. 

It was a world of brick and stone and wood, and of a neurological community relationship that would probably never be surpassed. A race had by-passed the entire machine-age of man, with its penetration of the secrets of matter and energy. Now, he felt, he could safely take the next-to-the-last step of his counter-attack. He concentrated on a pattern that would characterize one of the beings who had projected an image to the Space Beagle. (He had, then, a sense of a small but noticeable lapse of time.) Then he was looking forth from one of the images, seeing the ship through an image. 

His first concern was with how the battle was progressing, but he had to restrain his will to know because to come aboard was only part of his necessary per-conditioning. He wanted to affect a group of perhaps millions of individuals, and had to affect them so powerfully that they would have to withdraw from the Space Beagle, and have no recourse but to stay away from it. 

He had proved that he could receive their thoughts, and that they could receive his. His association with one nervous system after another would not have been possible unless that was so. Now he was ready. He thought into the darkness: 

"You live in a Universe; and within you, you form pictures of the Universe as it seems to you. Of that Universe you know nothing and can know nothing except for the pictures, but the pictures within you of the Universe are not the Universe . . . " 

How could you influence another's mind?—By changing his assumptions. How could you alter another's actions?—By changing his basic beliefs, his emotional certainties. 

Carefully, Grosvenor went on: "And the pictures within you do not show all about the Universe, for there are many things which you cannot know directly, not having senses to know. Within the Universe there is an order, and if the order of the pictures within you is not as the order of the Universe, then you are deceived . . . " 

In the history of life, few thinking beings had ever done anything illogical—within their frame of reference. If the frame was falsely based, if the assumptions were untrue to reality, then the individual's automatic logic could lead him to disastrous conclusions. 

The assumptions had to be changed. Grosvenor changed them, deliberately, coolly, honestly. His own basic hypothesis behind what he was doing was that the Riim had no defense. These were the first new ideas they had had in countless generations and he did not doubt that the impact would be colossal. This was a fellah civilization, rooted in certainties that had never before been challenged. There was ample historical evidence that a tiny intruder could influence decisively the future of entire fellahin races. 

Huge old India had crumbled before a few thousand Englishmen. Similarly, all the fellah peoples of ancient Earth were taken over with ease, and did not revive till the core of their inflexible attitudes was forever shattered by the dawning realization that there was more to life than they had been taught under their rigid systems. The Riim were peculiarly vulnerable. Their method of communication, unique and wonderful though it was, made it possible to influence them all in a single intensive operation. Over and over, Grosvenor repeated his message, adding, each time, one instruction that had to do with the ship. The instruction was: 

"Change the pattern you are using against those on the ship, and then withdraw it. Change the pattern, so that they can relax, and sleep . . . then withdraw it . . . do not attack again . . . " 

He had only a vague notion as to how long he actually poured his commands into that tremendous neural circuit. He guessed about two hours. Whatever the time involved, it ended as the relay switch on the encephalo-adjuster automatically broke the connection between himself and the image in the wall of his department. Abruptly, he was aware of the familiar surroundings of his own department. He glanced at where the image had been and tensed as he saw that it was still there, but shook his head slightly. He could hardly expect a definite reaction this soon. The Riim, also, were recovering from a connection that had just been broken. 

As Grosvenor watched, the pattern of light from the image changed subtly. Grosvenor's head drooped sleepily. He sat up jerkily, remembering. The instructions he had given—to relax and sleep—this was the result. All over the ship, men would be sleeping as the new hypnotic pattern extended its inhibitory paralysis over the hemispheres of the brain. 

About three minutes went by. Suddenly, the double image of the Riim vanished from the glistening wall in front of him. A moment later, Grosvenor was out in the corridor. As he raced along, he saw that unconscious men lay everywhere but that the walls were bright and clear, Not once on his journey to the control room did he see an image. 

Inside the control room, he stepped gingerly over the sleeping form of Captain Leeth, who lay on the floor near the control panel. With a sigh of relief, Grosvenor threw the switch that energized the outer screen of the ship. 

Seconds later, Elliott Grosvenor was in the control chair, altering the course of the Space Beagle. 

THE END 