apologize about that noise and—well, we got to talking and—"

She had signed a purchase order, too.

It had been the damnedest day, Burckhardt thought later, on his way up to bed. But the day wasn't done with him yet. At the head of the stairs, the weakened spring in the electric light switch refused to click at all. He snapped it back and forth angrily and, of course, succeeded in jarring the tumbler out of its pins. The wires shorted and every light in the house went out.

"Damn!" said Guy Burckhardt.

"Fuse?" His wife shrugged sleepily. "Let it go till the morning, dear."

Burckhardt shook his head. "You go back to bed. I'll be right along."

It wasn't so much that he cared about fixing the fuse, but he was too restless for sleep. He disconnected the bad switch with a screwdriver, stumbled down into the black kitchen, found the flashlight and climbed gingerly down the cellar stairs. He located a spare fuse, pushed an empty trunk over to the fuse box to stand on and twisted out the old fuse.

When the new one was in, he heard the starting click and steady drone of the refrigerator in the kitchen overhead.

He headed back to the steps, and stopped.

Where the old trunk had been, the cellar floor gleamed oddly bright. He inspected it in the flashlight beam. It was metal!

"Son of a gun," said Guy Burckhardt. He shook his head unbelievingly. He peered closer, rubbed the edges of the metallic patch with his thumb and acquired an annoying cut—the edges were sharp.

The stained cement floor of the cellar was a thin shell. He found a hammer and cracked it off in a dozen spots—everywhere was metal.

The whole cellar was a copper box. Even the cement-brick walls were false fronts over a metal sheath!

affled, he attacked one of the foundation beams. That, at least, was real wood. The glass in the cellar windows was real glass.

He sucked his bleeding thumb and tried the base of the cellar stairs. Real wood. He chipped at the bricks under the oil burner. Real bricks. The retaining walls, the floor—they were faked.

It was as though someone had shored up the house with a frame of metal and then laboriously concealed the evidence.

The biggest surprise was the upside-down boat hull that blocked the rear half of the cellar, relic of a brief home workshop period that Burckhardt had gone through a couple of years before. From above, it looked perfectly normal. Inside, though, where there should have been thwarts and seats and lockers, there was a mere tangle of braces, rough and unfinished.

"But I built that!" Burckhardt exclaimed, forgetting his thumb. He leaned against the hull dizzily, trying to think this thing through. For reasons beyond his comprehension, someone had taken his boat and his cellar away, maybe his whole house, and replaced them with a clever mock-up of the real thing.

"That's crazy," he said to the empty cellar. He stared around in the light of the flash. He whispered, "What in the name of Heaven would anybody do that for?"

Reason refused an answer; there wasn't any reasonable answer. For long minutes, Burckhardt contemplated the uncertain picture of his own sanity.

He peered under the boat again, hoping to reassure himself that it was a mistake, just his imagination. But the sloppy, unfinished bracing was unchanged. He crawled under for a better look, feeling the rough wood incredulously. Utterly impossible!

He switched off the flashlight and started to wriggle out. But he didn't make it. In the moment between the command to his legs to move and the crawling out, he felt a sudden draining weariness flooding through him.

Consciousness went—not easily, but as though it were being taken away, and Guy Burckhardt was asleep.

III

n the morning of June 16th, Guy Burckhardt woke up in a cramped position huddled under the hull of the boat in his basement—and raced upstairs to find it was June 15th.

The first thing he had done was to make a frantic, hasty inspection of the boat hull, the faked cellar floor, the imitation stone. They were all as he had remembered them—all completely unbelievable.

The kitchen was its placid, unexciting self. The electric clock was purring soberly around the dial. Almost six o'clock, it said. His wife would be waking at any moment.

Burckhardt flung open the front door and stared out into the quiet street. The morning paper was tossed carelessly against the steps—and as he retrieved it, he noticed that this was the 15th day of June.

But that was impossible. Yesterday was the 15th of June. It was not a date one would forget—it was quarterly tax-return day.

He went back into the hall and picked up the telephone; he dialed for Weather Information, and got a well-modulated chant: "—and cooler, some showers. Barometric pressure thirty point zero four, rising ... United States Weather Bureau forecast for June 15th. Warm and sunny, with high around—"

He hung the phone up. June 15th.

"Holy heaven!" Burckhardt said prayerfully. Things were very odd indeed. He heard the ring of his wife's alarm and bounded up the stairs.

Mary Burckhardt was sitting upright in bed with the terrified, uncomprehending stare of someone just waking out of a nightmare.

"Oh!" she gasped, as her husband came in the room. "Darling, I just had the most terrible dream! It was like an explosion and—"

"Again?" Burckhardt asked, not very sympathetically. "Mary, something's funny! I knew there was something wrong all day yesterday and—"

He went on to tell her about the copper box that was the cellar, and the odd mock-up someone had made of his boat. Mary looked astonished, then alarmed, then placatory and uneasy.

She said, "Dear, are you sure? Because I was cleaning that old trunk out just last week and I didn't notice anything."

"Positive!" said Guy Burckhardt. "I dragged it over to the wall to step on it to put a new fuse in after we blew the lights out and—"

"After we what?" Mary was looking more than merely alarmed.

"After we blew the lights out. You know, when the switch at the head of the stairs stuck. I went down to the cellar and—"

Mary sat up in bed. "Guy, the switch didn't stick. I turned out the lights myself last night."

Burckhardt glared at his wife. "Now I know you didn't! Come here and take a look!"

He stalked out to the landing and dramatically pointed to the bad switch, the one that he had unscrewed and left hanging the night before....

Only it wasn't. It was as it had always been. Unbelieving, Burckhardt pressed it and the lights sprang up in both halls.

ary, looking pale and worried, left him to go down to the kitchen and start breakfast. Burckhardt stood staring at the switch for a long time. His mental processes were gone beyond the point of disbelief and shock; they simply were not functioning.

He shaved and dressed and ate his breakfast in a state of numb introspection. Mary didn't disturb him; she was apprehensive and soothing. She kissed him good-by as he hurried out to the bus without another word.

Miss Mitkin, at the reception desk, greeted him with a yawn. "Morning," she said drowsily. "Mr. Barth won't be in today."

Burckhardt started to say something, but checked himself. She would not know that Barth hadn't been in yesterday, either, because she was tearing a June 14th pad off her calendar to make way for the "new"