It came to him, an insistent call. It was asking about the earth--his own world. _What of Earth's armies and their means of defense?_ Vaguely he sensed the demand, and without conscious volition he responded. He pictured the world he had known; how plainly he saw the wide field at Maricopa, and the sweeping flight of a squadron of planes! _Yes--yes! How high could they ascend?_ From one of the planes he saw the world below; the ships were near their ceiling; this was the limit of their climb. _And did they fight with gas? What of their deadliness?_ And again he was seated in a plane, and he was firing tiny bullets from a tiny gun. No. They did not use gas. _But on the ground below--what fortifications? What means of defense?_
McGuire's mind was no longer his own; he could only respond to that invisible questioner, that insistent demand from out of the depths where he was floating. And yet there was something within him that protested, that clamored at his mind and brain.
Fortifications! They must know about fortifications--anti-aircraft guns--means for combatting aerial attack. Yes, he knew, and he must explain--and the thing within him pounded in the back of his brain to draw him back to himself.
He saw a battery of anti-aircraft guns in operation; the guns were firing; shells were bursting in little plumes of smoke high in the air. And that self within him was shouting now, hammering at him; "You are seeing it," it told him; "it is there before you on the screen. Stop! Stop!"
And for an instant McGuire had the strange experience of witnessing his own thoughts. Memories, mental records of past experience, were flashing through his mind; mock battles, and the batteries were firing! And, before him, on the metal screen, there glowed a vivid picture of the same thing. Men were serving the guns with sure swiftness; the bursts were high in the air--in a flash of understanding Lieutenant McGuire knew that he was giving his country's secrets to the enemy. And in that same instant he felt himself swept upward from the depths of that darkness where he had drifted. He was himself again, bound and helpless before an infernal contrivance of these devil-creatures. They had read his thoughts; the machine beside him had projected them upon the screen for all to see; a steady clicking might mean their reproduction in motion pictures for later study! He, Lieutenant McGuire, was a traitor against his will!