"Bullard; Master Pilot, First Class; Number U.S. 1; calling Doctor Roche at Allied Observatory, Mount Everest. Micro-wave, please, and connect through for telefoto-projection." A few breathless seconds passed, while Chet aimed an instrument of gleaming chromium and glass, whose cable connections vanished in the phone panel recess. He focused it upon an artificially darkened screen above and behind the grouped figures on the stage. Then: "Doctor Roche?" Chet queried. And, before the whole audience, the dark screen came to life to show a clear-cut picture of a man who sat at a telescope; whose hand held a radiophone; and who glanced up frowningly and said: "Yes, this is Doctor Roche." Chet's response was immediate. "Bullard speaking; Chet Bullard, at New York. When I was in your observatory yesterday, Doctor, you said that you had seen flashes of light on the Moon. You remember that, don't you? You saw them some months ago while I was on the Dark Moon." * * * * * The man in that distant observatory was no longer scowling at this interruption of his work. His smile was echoed by the cordial tone of his voice that rang clearly through the great hall. "Correct, Mr. Bullard. An observer at our two hundred-inch reflector reported them on two successive nights. They were inside the crater of Hercules." From his place at the center of the stage the waiting Commander of Air protested: "Come--come! We know all about that, Bullard. Are you trying to say--" The voice of the astronomer was speaking again: "You will no doubt be interested to know that the lights occurred again yesterday at about this time.... Let me see if they are on now. I will have the two hundred-inch instrument used as before, and will show you what we see. "Watch your screen, but don't expect to find any substantiation of your wild theory that these lights have a human origin." He laughed softly. "No atmosphere to speak of there, you know; we have determined that very definitely." On the screen the picture of the smiling man flashed off; it was replaced by an unflickering darkness that came abruptly into softly shaded light. There was an expanse of volcanic terrain and a round orifice of tremendous size, where the sunlight cast black shadows. Other shaded portions about were like rocky, broken ground. * * * * * To Chet, staring at the strange conformation, came the quick sense of hanging above that ground and looking down upon it. And he knew that in New York he was looking through a great telescope down under the world and was staring straight down into the throat of an extinct volcano on the Moon. There were few wonders of the modern world that could thrill the master pilot with any feeling of amazement, but here was a new experience. He would have spoken, would have ejaculated some word of wonder, but for the new light that claimed his eyes and brain.