"I mean, suppose he's an imbecile, too? I doubt whether an imbecile would really be a spy, if you see what I mean."
Dr. O'Connor appeared to consider the notion. After a little while he said: "It is, I suppose, possible. But the readings on the machine don't give us the same timing as they did in Charlie's case—or even the same sort of timing."
"I don't quite follow you," Malone said. Truthfully, he felt about three miles behind. But perhaps everything would clear up soon. He hoped so. On top of everything else, his feet were now hurting a lot more.
"Perhaps if I describe one of the tests we ran," Dr. O'Connor said, "things will be somewhat clearer." He leaned back in his chair. Malone shifted his feet again and transferred his hat from his right hand to his left hand.
"We put one of our test subjects in the insulated room," Dr. O'Connor said, "and connected him to the detector. He was to read from a book—a book that was not too common. This was, of course, to obviate the chance that some other person nearby might be reading it, or might have read it in the past. We picked 'The Blood is the Death,' by Hieronymus Melanchthon, which, as you may know, is a very rare book indeed."
"Sure," Malone said. He had never heard of the book, but he was, after all, willing to take Dr. O'Connor's word for it.
The telepathy expert went on: "Our test subject read it carefully, scanning rather than skimming. Cameras recorded the movements of his eyes in order for us to tell just what he was reading at any given moment, in order to correlate what was going on in his mind with the reactions of the machine's indicators, if you follow me."
Malone nodded helplessly.
"At the same time," Dr. O'Connor continued blithely, "we had Charlie in a nearby room, recording his babblings. Every so often, he would come out with quotations from 'The Blood is the Death,' and these quotations corresponded exactly with what our test subject was reading at the time, and also corresponded with the abnormal fluctuations of the detector."