The voice ceased as the connection clicked off. Two other broadcasting stations came on simultaneously, as the loud-speaker attached to the set which Dick had placed in operation testified. He looked up to receive Stan’s news and, little surprized, turned again to the tuning tube of the V-ray receiver, quickly tuning to the wave-length of the two stations now on the air, while Stan, aware at last of what he was doing, placed a heavy ammeter across the output terminals. The needle on the ammeter dial hesitated for the smallest fraction of a second, then jumped to its maximum position. An instant later the instrument fell to the floor, a smoking ruin. The two men looked at each other, their eyes bulging. “No need to telephone those stations,” Dick said, his voice shaking. “They’ll be burned out, too.” “And _we’re doing it_!” whispered Stan. “My God, Dick!--the man said it was as though someone suddenly doubled the load on their generators. That means _wireless transmission of power_!” Dick stood rigid, then a faint smile touched his lips, as of tension relieved. “And now,” he announced, “we’ll go up to a wave-length of one million meters and see what happens to a set of head-phones.” Turning to the set he worked busily for some minutes, adjusting various devices and concentrating the projector ray upon the detector tube directly below it. Stan, too excited now to think of electrocution, stripped off the clumsy gloves and with his bare hands connected two pairs of receivers to the terminals where the two meters had been. With something very like a prayer they placed the telephones over their ears, and Dick adjusted controls until a low, musical hum became audible. * * * * * Suddenly it seemed to Stan as if thousands of conversations were taking place inside his head. He heard no voices, yet within his brain he was aware of the coming and going of myriad thoughts and ideas not his own. He turned to Dick and started to speak, then realized that it was unnecessary. Dick’s mind and his were in perfect tune; they could read each others’ thoughts. “Do you feel what I do, or am I going crazy?” Stan asked. “Yes. It’s true.” “What does it mean? I can’t understand.” “It means that we are listening in on interplanetary thought transmissions. I believed that other heavenly bodies conversed by means of geometry or music. I was wrong. I should have known that they would be far enough advanced to use telepathy--radio telepathy.” “These voices that do not seem to be real voices--are they from Mars?” “Probably they are. Mars is closest to us in the solar system. The Music of the Spheres!” All this without a word having been spoken....