bothered him.

He was walking down the main corridor of the Physics Building on the University campus, wondering as he constantly did about how he could extract some useful knowledge from the aliens when a quiet voice speaking accentless English sounded behind him.

"What precisely do you wish to know, Dr. Matson?" the voice said.

Matson whirled to face the questioner, and looked into the face of Ixtl. The alien was smiling, apparently pleased at having startled him. "What gave you the idea that I wanted to know anything?" he asked.

"You did," Ixtl said. "We all have been conscious of your thoughts for many days. Forgive me for intruding, but I must. Your speculations radiate on such a broad band that we cannot help being aware of them. It has been quite difficult for us to study your customs and history with this high level background noise. We are aware of your interest, but your thoughts are so confused that we have never found questions we could answer. If you would be more specific we would be happy to give you the information which you seek."

"Oh yeah!" Matson thought.

"Of course. It would be to our advantage to have your disturbing speculations satisfied and your fears set at rest. We could accomplish more in a calmer environment. It is too bad that you do not receive as strongly as you transmit. If you did, direct mental contact would convince you that our reasons for satisfying you are good. But you need not fear us, Earthman. We intend you no harm. Indeed, we plan to help you once we learn enough to formulate a proper program."

"I do not fear you," Matson said—knowing that he lied.

"Perhaps not consciously," Ixtl said graciously, "but nevertheless fear is in you. It is too bad—and besides," he continued with a faint smile "it is very uncomfortable. Your glandular emotions are quite primitive, and very disturbing."

"I'll try to keep them under control," Matson said dryly.

"Physical control is not enough. With you there would have to be mental control as well. Unfortunately you radiate much more strongly than your fellow men, and we are unable to shut you out without exerting considerable effort that could better be employed elsewhere." The alien eyed Matson speculatively. "There you go again," he said. "Now you're angry."

Matson tried to force his mind to utter blankness, and the alien smiled at him. "It does some good—but not much," he said. "Conscious control is never perfect."

"Well then, what can I do?"

"Go away. Your range fortunately is short."

Matson looked at the alien. "Not yet," he said coldly. "I'm still looking for something."

"Our technology," Ixtl nodded. "I know. However I can assure you it will be of no help to you. You simply do not have the necessary background. Our science is based upon a completely different philosophy from yours."

To Matson the terms were contradictory.

"Not as much as you think," Ixtl continued imperturbably. "As you will find out, I was speaking quite precisely." He paused and eyed Matson thoughtfully. "It seems as though the only way to remove your disturbing presence is to show you that our technology is of no help to you. I will make a bargain with you. We shall show you our machines, and in return you will stop harassing us. We will do all in our power to make you understand; but whether you do or do not, you will promise to leave and allow us to continue our studies in peace. Is that agreeable?"

Matson swallowed the lump in his throat. Here it was—handed to him on a silver platter—and suddenly he wasn't sure that he wanted it!

"It is," he said. After all, it was all he could expect.

They met that night at the spaceship. The aliens, tall, calm and cool; Matson stocky, heavy-set and sweating. The contrast was infernally sharp, Matson thought. It was as if a primitive savage were meeting a group of nuclear physicists at Los Alamos. For some unknown reason he felt ashamed that he had forced these people to his wishes. But the aliens were pleasant about it. They took the imposition in their usual friendly way.

"Now," Ixtl said. "Exactly what do you want to see—to know?"

"First of all, what is the principle of your space drive?"

"There are two," the alien said. "The drive that moves this ship in normal space time is derived from Lurgil's Fourth Order equations concerning the release of subatomic energy in a restricted space time continuum. Now don't protest! I know you know nothing of Lurgil, nor of Fourth Order equations. And while I can show you the mathematics, I'm afraid they will be of little help. You see, our Fourth Order is based upon a process which you would call Psychomathematics and that is something I am sure you have not yet achieved."

Matson shook his head. "I never heard of it," he admitted.

"The second drive operates in warped space time," Ixtl continued, "hyperspace in your language, and its theory is much more difficult than that of our normal drive, although its application is quite simple, merely involving apposition of congruent surfaces of hyper and normal space at stress points in the ether where high gravitational fields balance. Navigation in hyperspace is done by electronic computer—somewhat more advanced models than yours. However, I can't give you the basis behind the hyperspace drive." Ixtl smiled depreciatingly. "You see, I don't know them myself. Only a few of the most advanced minds of Aztlan can understand. We merely operate the machines."

Matson shrugged. He had expected something like this. Now they would stall him off about the machines after handing him a fast line of double-talk.

"As I said," Ixtl went on, "there is no basis for understanding. Still, if it will satisfy you, we will show you our machines—and the mathematics that created them although I doubt that you will learn anything more from them than you have from our explanation."

"I could try," Matson said grimly.

"Very well," Ixtl replied.

He led the way into the center of the ship where the seamless housings stood, the housings that had baffled some of the better minds of Earth. Matson watched while the star men proceeded to be helpful. The housings fell apart at invisible lines of juncture, revealing mechanisms of baffling simplicity, and some things that didn't look like machines at all. The aliens stripped the strange devices and Ixtl attempted to explain. They had anti-gravity, forcefields, faster than light drive, and advanced design computers that could be packed in a suitcase. There were weird devices whose components seemed to run out of sight at crazily impossible angles, other things that rotated frictionlessly, suspended in fields of pure force, and still others which his mind could not envisage even after his eyes had seen them. All about him lay the evidence of a science so advanced and alien that his brain shrank from the sight, refusing to believe such things existed. And their math was worse! It began where Einstein left off and went off at an incomprehensible tangent that involved psychology and ESP. Matson was lost after the first five seconds!

Stunned, uncomprehending and deflated, he left the ship. An impression that he was standing with his toe barely inside the door of knowledge became a conscious certainty as he walked slowly to his car. The wry thought crossed his mind that if the aliens were trying to convince him of his abysmal ignorance, they had succeeded far beyond their fondest dreams!

They certainly had! Matson thought grimly as he selected five cartridges from the box lying beside him. In fact they had succeeded too well. They had turned his deflation into antagonism, his ignorance into distrust. Like a savage, he suspected what he could not understand. But unlike the true primitive, the emotional distrust didn't interfere with his ability to reason or to draw logical inferences from the data which he accumulated. In attempting to convince, Ixtl had oversold his case.