"None except a little receiver about the size of your watch."
Luther whistled again. On his face was a look of surprise—the Surprise that's the brother of Doubt.
Dr. Alton was looking earnestly at his son. "Is that really true, Cyrus? Are you absolutely sure no previous knowledge of each other's intentions may have helped a little?"
Then Cyrus explained the experiments in detail. He told how they purposely chose subjects unknown to each other; how they put on paper the words as they arrived; that the percentage of messages correctly received increased at every trial; and that weather conditions, wind, rain or sunshine seemed to make little difference in the results. After answering other questions, he said to his father:
"But that is only the beginning. The day is coming when even the spoken word will be superfluous."
"Just what do you mean, Cyrus?"
"I mean communicating thought by electric induction—by direct vibrations."
"Say, Cyrus!" exclaimed Luther, "the Arabian Nights isn't in it with you!"
"No, it isn't," said Cyrus. "For I have already done it."
"Done what?"