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Immediately upon my arrival, I had prepared the virator for my journey back to Earth by substituting the projecting apparatus of the radioscope for the receiving apparatus. It was only necessary now to start the clockwork that would shut off the current to earth in half an hour, and would start the current flowing through the upper chamber of the virator.
With a perfect knowledge of the mechanism of the instrument, I was soon at work adjusting the projecting and receiving apparatus. An ordinary telescope was attached to the huge tube of the radioscope, and with Almos' dexterity I soon located Earth through it, thus sighting the radioscope for that planet.
Since the discovery of the radioscope, which enabled us to see the people on your planet, Mars has yearned to give a helping hand to her younger sister. That time has now come, and before many years the conditions of life on Earth will be similar to those here.
"To the lower chamber or dome of a virator I have connected the receiving apparatus of a radioscope, first removing the image surface. This can be disconnected easily, and the projecting apparatus substituted, from which I have also removed the image surface.
"The glow of your instrument, in response to the super-radium current, will warn you that this has taken place, and you must then prepare yourself for departure. You will not observe any image, owing to my having removed the lenses of the radioscope, but your instrument will glow in response to the current.
Thereafter my interest in your progress was as great as your own, and every twenty-four hours, when the eastern hemisphere of Earth was turned toward Mars, I searched with the radioscope until I got the response of your instrument. "I have kept my success in communicating with Earth a secret, as it involves an invention of mine which I have not yet made public, and of which I will now tell you.
While she was yet hovering between consciousness and unconsciousness on the couch, he had unwrapped the package which he had brought with him. For a moment he held the comb which she had dropped near the radioscope. With a low exclamation of surprise he shoved it into his pocket.
Denison had scarcely gone to arrange for some one to watch the office that night, when Kennedy, having gathered up his radioscope and packed into a parcel a few other things from various cabinets, announced: "Walter, I must see that Miss Wallace, right away. Denison has already given me her address. Call a cab while I finish clearing up here.
"Radium has been near that tray," he answered. "It is radioactive. I suspected it first when I saw that violet color. That is what radium does to that kind of glass. You see, if radium exists in a gram of inactive matter only to the extent of one in ten-thousand million parts its presence can be readily detected by this radioscope, and everything that has been rendered radioactive is the same.
"To-morrow, when that part of the Earth's surface on which Paris is situated appears, I shall attach the receiving apparatus of the radioscope to the lower chamber of the virator, so that the return current from Earth will flow into it. I shall then set the clockwork to turn on the current of super-radium in half an hour. In that time my body must be in a condition to receive your spirit."
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