as the teacher told him kindly where the boy's examination room was.

But he remembered most vividly Alice Dalby standing in the middle of the room, her blouse off but held protectingly in front of her as she jumped up and down in rage and pointed a finger at him. "You get out of here, Melvin Hastings! You're not a nice boy at all!"

Face red, he had hastily retreated as the teacher assured Alice and the rest of the girls that he had made a simple mistake. But how angry Alice had been! It was a week before she would speak to him.

He smiled and sank back deeply into the pillow. He remembered how proud he had been when old Doc Collins, who came out to do the honors every Fall, had told him there wasn't a thing wrong with him and that if he continued to drink his milk regularly he'd grow up to be a football player. He could still hear Doc's words whistling through his teeth and feel the coldness of the stethoscope on his chest.

Suddenly, he sat upright in bed in the darkness.

Stethoscope!

They had tapped and inspected and listened to Alice that day, and all the other examination days.

If Doc Collins had been unable to find a heartbeat in her he'd have fainted—and spread the news all over town!

Mel got up and stood at the window, his heart pounding. Old Doc Collins was gone, but the medical records of those school examinations might still be around somewhere. He didn't know what he expected to prove, but surely those records would not tell the same story Dr. Winters had told.

It took him nearly all the next day. The grade school principal agreed to help him check through the dusty attic of the school, where ancient records and papers were tumbled about and burst from their cardboard boxes.

Then Paul Ames, the school board secretary, took Mel down to the District Office and offered to help look for the records. The old building was stifling hot and dusty with summer disuse. But down in the cool, cobwebbed basement they found it.... Alice's records from the third grade on up through the ninth. On every one: heart, o.k.; lungs, normal. Pulse and blood pressure readings were on each chart.

"I'd like to take these," said Mel. "Her doctor in town—he wants to write some kind of paper on her case and would like all the past medical history he can get."

Paul Ames frowned thoughtfully. "I'm not allowed to give District property away. But they should have been thrown out a long time ago—take 'em and don't tell anybody I let you have 'em."

"Thanks. Thanks a lot," Mel said.

And when she was fourteen or fifteen her appendix had been removed. A Dr. Brown had performed the operation, Mel remembered. He had taken over from Collins.

"Sure, he's still here," Paul Ames said. "Same office old Doc Collins used. You'll probably find him there right now."

Dr. Brown remembered. He didn't remember the details of the appendectomy, but he still had records that showed a completely normal operation.

"I wonder if I could get a copy of that record and have you sign it," Mel said. He explained about the interest of Dr. Winters in her case without revealing the actual circumstances.

"Glad to," said Dr. Brown. "I just wish things hadn't turned out the way they have. One of the loveliest girls that ever grew up here, Alice."

The special memorial service was held in the old community church on Sunday afternoon. It was like the drawing of a curtain across a portion of Mel's life, and he knew that curtain would never open again.

He took a bus leaving town soon after the service.

There was one final bit of evidence, and he wondered all the way back to town why he had not thought of it first. Alice's pregnancy had ended in miscarriage, and there had never been another.

But X-rays had been taken to try to find the cause of Alice's difficulty. If they showed that Alice was normal within the past two years—

Dr. Winters was mildly surprised to see Mel again. He invited the reporter in to his office and offered him a chair. "I suppose you have come to inquire about our findings regarding your wife."

"Yes—if you've found anything," said Mel. "I've got a couple of things to show you."

"We've found little more than we knew the night of her death. We have completed the dissection of the body. A minute analysis of each organ is now under way, and chemical tests of the body's substances are being made. We found that differences in the skeletal structure were almost as great as those in the fleshy tissues. We find no relationship between these structures and those of any other species—human or animal—that we have ever found."

"And yet Alice was not always like that," said Mel.

Dr. Winters looked at him sharply. "How do you know that?"

Mel extended the medical records he had obtained in Central Valley. Dr. Winters picked them up and examined them for a long time while Mel watched silently.

Finally, Dr. Winters put the records down with a sigh. "This seems to make the problem even more complex than it was."

"There are X-rays, too," said Mel. "Alice had pelvic X-rays only a little over two years ago. I tried to get them, but the doctor said you'd have to request them. They should be absolute proof that Alice was different then."

"Tell me who has them and I'll send for them at once."

An hour later Dr. Winters shook his head in disbelief as he turned off the light box and removed the X-ray photograph. "It's impossible to believe that these were taken of your wife, but they corroborate the evidence of the other medical records. They show a perfectly normal structure."

The two men remained silent across the desk, each reluctant to express his confused thoughts. Dr. Winters finally broke the silence. "It must be, Mr. Hastings," he said, "—it must be that this woman—this utterly alien person—is simply not your wife, Alice. Somehow, somewhere, there must be a mistake in identity, a substitution of similar individuals."

"She was not out of my sight," said Mel. "Everything was completely normal when I came home that night. Nothing was out of place. We went out to a show. Then, on the way home, the accident occurred. There could have been no substitution—except right here in the hospital. But I know it was Alice I saw. That's why I made you let me see her again—to make sure."

"But the evidence you have brought me proves otherwise. These medical records, these X-rays prove that the girl, Alice, whom you married, was quite normal. It is utterly impossible that she could have metamorphosed into the person on whom we operated."

Mel stared at the reflection of the sky in the polished desk top. "I don't know the answer," he said. "It must not be Alice. But if that's the case, where is Alice?"

"That might even be a matter for the police," said Dr. Winters. "There are many things yet to be learned about this mystery."

"There's one thing more," said Mel. "Fingerprints. When we first came here Alice got a job where she had to have her fingerprints taken."

"Excellent!" Dr. Winters exclaimed. "That should give us our final proof!"

It took the rest of the afternoon to get the fingerprint record and make a comparison. Dr. Winters called Mel at home to give him the report. There was no question. The fingerprints were identical. The corpse was that of Alice Hastings.

The nightmare came again that night. Worse than Mel could ever remember it. As always, it was a dream of space, black empty space, and he was floating alone in the immense depths of it. There was no direction. He was caught in a whirlpool of vertigo from which he reached out with agonized yearning for some solidarity to cling to.

There was only space.

After a time he was no longer alone. He could not see them, but he knew they were out there. The searchers. He did not know why he had to flee or why they sought him, but he knew they must never