pronounced. "The French accent of a Greek waiter in a fake French restaurant. In the Bronx."

"Not quite. The pronunciation was all right for French accent, but the cadence, the way the word-sounds were strung together, was German."

The elderly man looked at the colonel keenly. "I see you're Intelligence," he mentioned. "Think he might be somebody up your alley, Colonel?"

The colonel shook his head. "I doubt it. There are agents of unfriendly powers in this country—a lot of them, I'm sorry to have to say. But they don't speak accented English, and they don't dress eccentrically. You know there's an enemy agent in a crowd, pick out the most normally American type in sight and you usually won't have to look further."

The train ground to a stop. A young couple with hand-luggage came in and sat at one end of the car, waiting until other accommodations could be found for them. After a while, it started again. I dallied over my drink, and then got up and excused myself, saying that I wanted to turn in early.

In the next car behind, I met the porter who had come in just before the stop. He looked worried, and after a moment's hesitation, he spoke to me.

"Pardon, sir. The man in the club-car who got off at Harrisburg; did you know him?"

"Never saw him before. Why?"

"He tipped me with a dollar bill when he got off. Later, I looked closely at it. I do not like it."

He showed it to me, and I didn't blame him. It was marked One Dollar, and United States of America, but outside that there wasn't a thing right about it. One side was gray, all right, but the other side was green. The picture wasn't the right one. And there were a lot of other things about it, some of them absolutely ludicrous. It wasn't counterfeit—it wasn't even an imitation of a United States bill.

And then it hit me, like a bullet in the chest. Not a bill of our United States. No wonder he had been so interested in whether our scientists accepted the theory of other time dimensions and other worlds of alternate probability!

On an impulse, I got out two ones and gave them to the porter—perfectly good United States Bank gold-certificates.

"You'd better let me keep this," I said, trying to make it sound the way he'd think a Federal 

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