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 magnet. Or at least I shall be drawn to the emerald," he added.

"Bosh!" Selwyn exclaimed. "That's all poppycock! What I want is a good detective and a police officer or two to search every man and woman in the room."

At this there came an indignant chorus of protest; the guests stirred uneasily.

"Mr. Selwyn, do you believe in the X-ray?" Astro asked.

The little man grunted, "Yes, I do; but this is no time for a lecture!"

"One moment, please, however! Nobody knows in just what part of the spectrum the X-rays lie, except that they are beyond the ultraviolet. They are visible only with the fluoroscope. Nobody knows just where the so-called actinic rays lie, either. They are invisible also; but they react upon a plate sensitized with nitrate of silver. Where are the N-rays, which emanate from the human body? Nobody knows; but I tell you, Mr. Selwyn, that they are registered in the gray matter of my brain. I am sensitive to them, as no one else has been, consciously, for centuries. And it is that sensitiveness that I propose to utilize. No thought can exist without modifying the molecular structure of the brain cells in the thinker. That change acts upon the ether, and is transmitted in vibratory form. Is it not possible that those ether waves can react upon the molecules in my brain and set up a corresponding change to that made by the original thought? Mr. Selwyn, I'll prove it!"

Astro's voice had risen to a strident tone, compelling and incisive. Every one looked at him eagerly. There