rofessor Sykes knew what it was to be harassed by the curious mob, to avoid traps set by ingenious reporters, but he knew, too, when he was meeting with honest bewilderment and a longing for knowledge. His fists were placed firmly on the hips of his stocky figure as he stood looking at the persistent questioner, and his eyes passed from the intent face to the snug khaki coat and the spread wings that proclaimed the wearer's work. A ship out of space—a projectile—this young man had said.

"Lieutenant," he suggested quietly—and again the smile had returned to his lips as he spoke—"sit down. I'm not as busy as I pretend to be. Now tell me: what in the devil have you got in your mind?"

And McGuire told him. "Like some of your dope," he said, "this is not for publication. But I have not been instructed to hush it up, and I know you will keep it to yourself."

He told the clear-eyed, listening man of the previous night's events. Of the radio's weird call and the mystery ship.

"Hallucination," suggested the scientist. "You saw the stars very clearly, and they suggested a ship."

"Tell that to Jim Burgess," said McGuire: "he was the pilot of that plane." And the scientist nodded as if the answer were what he expected.

He asked again about the ship's flight. And he, too, bore down heavily upon the matter of acceleration in the thin upper air. He rose to lay a friendly hand on McGuire's shoulder.

"We can't know what it means," he said, "but we can form our own theories, you and I—and anything is possible.