poor answer, though no harder to believe than that any group on Earth could so suddenly come up with miracles.

Anyhow, men knew enough already to be pretty sure that Mars and Venus wouldn't have creatures that could invade Earth—and the other planets were hopeless. Perhaps from another star—but that would mean violating the theories of mass-increase with the speed of light, and he was not ready to accept that, yet.

This time, he went out of the building without looking first. It could do no good—they could hide from him, he knew, and he would only call attention to himself by looking around. With the change in appearance, he might get by. He moved rapidly up to Broadway, where he found a little clothing store and a ready-made suit that nearly fitted him. The tailor there seemed unconcerned when he insisted the cuffs be turned up at once, and that he wanted to wear it immediately. It took nearly an hour, but he felt safe, for a change. A five-and-ten furnished a pair of heavy-rimmed glasses that seemed to have blanks in them, and he decided he might get by.

There was no evidence of pursuit. He caught a cab, and headed for the library. Ellen had been well-heeled—suspiciously so for a girl who lived in a cold-water flat like that; he'd peeled fifteen tens from her wallet, and there'd been more, not to mention the twenties. His conscience bothered him a bit, but he was in no position to worry too much.

he library was still the puzzle of the ages to him—he'd used it half his life, and still found it impossible to guess why such a building had been chosen. But eventually, he found the periodical room, and managed to get through the red tape enough to be given a small table with a stack of newspapers and magazines.

The mathematics magazines interested him most. He pored through them, looking for a single hint of the things he had seen. Einstein's work with gravity stood out, but no real advances had come from it. It was still a philosophical rather than an actual attack on physics—as beautiful as a new theology, and about as hard to utilize. He skimmed, through the pages, but nothing showed. No real advance had been made since his memory blanked out, except for one paper on variable stars which was interesting, but unhelpful.

He threw them aside in disgust. He knew that it was useless to look in other languages. Work couldn't be done without some first stages that would be reported, and any significant new theory would be picked up and spread. Science wasn't yet 

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