But this, he knew at once, was not the Coonskin system. It was no place he had ever heard of. Nowhere in the known universe was there a place like this. Something had gone wrong and he had been hurled, not to the Coonskin planet which had been his destination, but to some far, forgotten corner of the universe, to some area, perhaps, where man would not penetrate for another million years, so far away from Earth that the distances involved became unimaginable.

Now again there were flickering motions, as if living shadows moved against the crystal background. As he watched, the flickering flowed into shifting shape and form and he could see that there were many moving shapes, all of them, strangely, separate entities that seemed to hold, within the flicker of them, individual personalities. As if, he thought in horror, they were things that had once been people-as if they might be alien ghosts.

"And I accepted them," he said to Oop. "I accepted them-on faith, perhaps. It was either that or reject them and be left there, standing all alone upon that crystal plain. A man of a century ago, perhaps, would not have accepted them. He would have been inclined to sweep them out of his mind as pure imagination. But I had spent too many hours with Ghost to gag at the thought of ghosts. I had worked too long with supernatural phenomena to quibble at the idea of creatures and of circumstances beyond the human pale.

"And the strange thing about it, the comforting thing about it, is that they sensed that I accepted them."

"And that is it?" asked Oop. "A planet full of ghosts?"

Maxwell nodded, "Perhaps that's one way of looking at it: But let me ask you-what really is a ghost?"

"A spook," said Oop. "A spirit."

"But what do you mean by spook? Define a spirit for me."

"I know," said Oop regretfully. "I was being a bit facetious and there was no excuse for it. We don't know what a ghost is. Even Ghost doesn't know exactly what he is. He simply knows that he exists-and if anyone should know, he should. He has mulled over it a lot. He's thought about it deeply. He has communed with fellow ghosts and there is no evidence. So you fall back upon the supernatural..."