"Wait a moment," he said, "perhaps you have been wondering if the brain would respond to your thought-impulses."

"Frankly, I have," I replied.

I wondered how much he knew, how much he had seen. Perhaps he was playing with me, secure in his own knowledge; or perhaps he was merely suspicious and was seeking confirmation of his suspicion. However that might be, I was determined not to be trapped out of my assumption that he had not seen and did not know.

"You were not, by any chance, attempting to see if it would respond?" he asked.

"Who, other than a stupid dolt, once having seen this invention, would not naturally harbor such a thought?" I asked.

"Quite right, quite right," he admitted; "it would only be natural, but did you succeed?" The pupils of his eyes contracted; his lids narrowed to two ominous slits. He seemed to be trying to bore into my soul; and, unquestionably, he was attempting to read my mind; but that, I knew, he could not accomplish.

I waved my hand in the direction of the ship. "Has it moved?" I asked with a laugh.

I thought that I saw just a faint hint of relief in his expression, and I felt sure then that he had not seen.

"It would be interesting, however, to know whether the mind of another than myself could control the mechanism," he said. "Suppose you try it."

"It would be a most interesting experiment. I should be glad to do so. What shall I try to have it do?"

"It will have to be an original idea of your own," he told me; "for if it is my idea, and I impart it to you, we cannot be definitely sure whether the impulse that actuates it originated in your brain or mine."

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