know for a fact that some companies spend twenty or thirty million dollars a year on advertising. Multiply it, say, by a hundred companies. Say that every one of them learns how to cut its advertising cost by only ten per cent. And that's peanuts, believe me!

"If they know in advance what's going to work, they can cut their costs in half—maybe to less than half, I don't know. But that's saving two or three hundred million dollars a year—and if they pay only ten or twenty per cent of that for the use of Tylerton, it's still dirt cheap for them and a fortune for whoever took over Tylerton."

Swanson licked his lips. "You mean," he offered hesitantly, "that we're a—well, a kind of captive audience?"

Burckhardt frowned. "Not exactly." He thought for a minute. "You know how a doctor tests something like penicillin? He sets up a series of little colonies of germs on gelatine disks and he tries the stuff on one after another, changing it a little each time. Well, that's us—we're the germs, Swanson. Only it's even more efficient than that. They don't have to test more than one colony, because they can use it over and over again."

It was too hard for Swanson to take in. He only said: "What do we do about it?"

"We go to the police. They can't use human beings for guinea pigs!"

"How do we get to the police?"

Burckhardt hesitated. "I think—" he began slowly. "Sure. This place is the office of somebody important. We've got a gun. We'll stay right here until he comes along. And he'll get us out of here."

Simple and direct. Swanson subsided and found a place to sit, against the wall, out of sight of the door. Burckhardt took up a position behind the door itself—

And waited.

he wait was not as long as it might have been. Half an hour, perhaps. Then Burckhardt heard approaching voices and had time for a swift whisper to Swanson before he flattened himself against the wall.

It was a man's voice, and a girl's. The man was saying, "—reason why you couldn't report on the phone? You're ruining your whole day's test! What the devil's the matter with you, Janet?"

"I'm sorry, Mr. Dorchin," she said in a sweet, clear tone. "I thought it was important."

The man grumbled, 

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