clenched. She closed her eyes and counted to ten quickly, then opened them. There were three upraised fingers. She counted the clenched ones and there were two. Relieved, she checked on the upraised fingers again—and there were seven.

She gave up in disgust. Deciding she ought to go home she stood up and started to cross to the coat tree.

The door to the corridor opened and Ren Gravenard stepped in.

"Hello!" Martha said in surprise. "I thought you were sent to observation."

"I was," Ren said. "That's where I am now, but when there are forty of you, you can sort of get lost in the group and wind up anywhere you want to."

"Well, I'm glad you're here," Martha said dryly. "Maybe you can explain a few things."

Ren grinned crookedly.

"Suppose I do the explaining over something to eat," he said. "I almost stopped and had something on the way over here, but I wanted to wait and eat with you. Do you mind?"

"Of course not," Martha frowned. She was taking a closer look at this spaceman second class. He had a nice way of smiling at her. His eyes had depths she hadn't noticed before.

The illogical thought came to her that maybe now that things didn't behave the way they should, maybe he and his fellow spacemen were the only ones that knew what it was all about.

"All this," Martha waved her hand vaguely. "It must have been caused by something about the Endore, mustn't it?"

Ren nodded, holding the door open for her. They walked along the corridor to the revolving doors, his hand tucked protectively under her arm.

"Is it mental?" Martha asked when they were on the sidewalk.

"No," Ren answered. "But let's wait until we eat. I'm starved to death. If you run into any trouble I'll help you out. You see, I know how to work things."

"Like finding page twenty-six in the book I'm reading?" Martha asked.

"That's simple," Ren said. "All you have to do is look for page twenty-nine and you'll run across page twenty-six right away. Things like that are mental, partly. I mean, you have to have the right attitude to get results you want."

"I don't understand," Martha said.

"Well, it's like this," Ren explained. "If you're looking for page twenty-six it won't be one of the first two pages you look at, regardless of where you open the book. But after you've looked at three of them you've passed the page you want unless you're not looking for it. If you're not looking for it you REACH the right page."

"But why page twenty-nine to find twenty-six?" Martha persisted.

"It has to do with the new arithmetic," Ren said.

"Oh," Martha said dully. "So that's the whole trouble with everything."

"No, that's only part of it," Ren said. "But here's a good place to eat." He guided her through the door.

An hour later Ren lit a cigarette and took a long drag on it, his eyes looking longingly into Martha's. He exhaled the smoke in a long white plume. Then he began talking.

"I don't know whether you read it on the report sheet or not, but the trip of the Endore began from this same spaceport two years ago. The observatory on Pluto had reported a free planet passing within two hundred quadrillion miles of the solar system. The Endore was assigned the task of landing on it, if feasible.

"I had been a member of the crew for only four months when the Endore turned outward from its position just the other side of Mars' orbit."

Ren smiled apologetically.

"I hadn't exactly planned on being a spaceman, second class. I don't know whether you know the system, but whether you do or not, it should suffice to say that I had studied for five years to become a research scientist, and failed. I decided to take out my disappointment by joining up for two years. I planned on making another try at research when I got out.

"Everything went along fine on the trip out. We were a very congenial crew with a fine, human commander. He made it a point to get personally acquainted with every member of the crew eventually. He seemed to take a particular liking to me for some reason. By the time we were half-way out to Metapor, as we found out it was called later, I was an unofficial first mate or something with free run of the pilot room and the instruments.

"I had guessed by now that when I enlisted they looked up my record and passed the word along to Commander Dunnam to sell me on the idea of a career as a spaceman.

"At any rate, I was in an ideal position to see all that went on first hand. We were within three hundred thousand miles of Metapor when we got the first indication of the change in metaphysics. I discovered it myself. I was helping the astrogator get the constants for the planet ..."

"Take a look at the gravy board, Ren," Ford Gratrick, the astrogator said. "What's she say?"

Ren looked at the fine black pointer on the gravity potentiometer. It pointed to a spot just two marks above the number ten on the dial.

"Ten and two tenths," Ren read.

"That can't be right," Ford frowned. "At this distance that would make this baby a super."

He came over and looked himself. While he was looking the pointer moved up to twenty and then down to six tenths.

"Must be out of order," Ford muttered. "Well, this'll give you experience with emergency equipment. Break out the manual gravy dish, Ren."

It was a fine coil spring in a glass tube. Other glass tubes fastened on, to make the length almost ten feet. At one g the spring with its weight would stretch out to the bottom. From there to a ten thousandth of a g the spring rose up to a point half-way.

Ren put it together speedily, placing it in the wall clamps designed to hold it. The glass itself was graduated with the scale of gravity strength. The cylindrical weight at the free end of the spring had a line on it that would coincide with the proper reading.

In practice it vibrated up and down so that it had to be read by estimation of the half-way point of the up and down motion.

Ren and Ford watched the red weight with its black line. It moved slowly and uniformly from the bottom to the top of the scale, from a full g to ten thousandth of a g, and back down again.

Meanwhile the gravity potentiometer (gravy board) was changing its reading constantly and erratically.

Ford licked his lips nervously and said, "Don't know what the old man'll say about this, but it looks like all we can say is that the thing has gravity."

"Why not call him and let him see for himself?" Ren asked.

Ford looked out the viewport at the round object in the distance and shook his head.

"I've got a hunch he knows it already," he said slowly. "The ship is probably on a nonsense track and the automatic tracker is either trying to find out what the law of gravity is, or is exploring for clues to light aberration. One gets you ten he'll give me a buzz in another minute."

He was right. The phone rang almost at once. It was Hugh Dunnam himself, asking for the gravy reading.

"You'll have to see it to believe it," Ford Gratrick said over the phone. "The manual swing is uniform over the whole range. The gravy board can't make up its mind where to settle at. It tries this and that reading."

He listened briefly. "Yes, sir," he said, and hung up. "He wants you in the pilot room, Ren," he added.

Ren started out of the central instrument room through the axis tube.

"Better be careful," Ford shouted after him. "No telling how this gravitation will behave. Don't let it slam you against anything."

Ren heard his words. He had a sudden, crazy thought that it was his own voice, and that he, as he sped along through the ship, was in reality Ford Gratrick. The thought startled him. He promptly forgot it.

There was a frown of concentration on his face. He was trying to visualize a gravity pull whose intensity was not a single-valued pressure but a