remember when or where I heard it, but there's some reason why you couldn't have an intelligent race much smaller than a good sized dog. It has something to do with the fact that they grow in size as their developing intelligence gives them an increasing advantage over their environment."

"Here's the evidence," Jeff answered, tapping the film with one finger.

"No," Pete was bending over the picture fragments again. "Look at these things in the corridor. They're obviously controls."

Jeff looked.

"I see what you mean," he said at last. "If there's any similarity between their mechanical system and ours, these controls are built for somebody pretty big. But look how they're scattered all over the ship. There's a good fifteen or twenty different groups of instruments and other things. That means a number of crew members; and you simply can't put a number of large crew members in those little corridors."

"There's a large amount of total space," Pete began. Then, suddenly a faint tremor ran through the ship. Jeff leaped for the screen and his father moved over to stand behind him.

"Good Lord," said Jeff, "look at her."

The other ship shook suddenly and rolled slightly to one side. Some unseen center of gravity pulled her back to her original position. She hesitated a moment, and then tried again, with the same results. She lay quiescent.

Jeff pounced on his radiation drum graph.

"What does it say?" Peter asked.

Jeff shook his head in astonishment. "Nothing," he answered, "just nothing at all."

"Nothing?" Peter came over to take a look at the graph himself. It was as Jeff had said. The line tracing the white surface of the graph was straight and undisturbed.

"But that's impossible," Peter frowned.

The two men turned back to the screen. As they watched, one final shudder shook the strange ship, and then, like a stranded whale who has given up hope, it lay still.

"My God!" said Pete, and Jeff turned to him in astonishment. It was the closest to profanity his father had come in twenty years. "Jeff, do you know what I think? I think that ship 

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