sir," said Kinnison. "They said not 'the' galaxy, or even 'this' galaxy—the thought was 'that' galaxy!"

"But nobody has ever—But skip it for now—the boys are ready for you. Take over!"

"QX. First we'll go free again. Don't think much, if any, of the stuff can come out here, but no use taking chances. Cut your screens. Now, all you gamma-zeta men, throw out your fields, and if any of you get a puncture, or even a flash, measure its position. You recording observers, step your scanners up to fifty thousand. QX?"

"QX!" the observers and recorders reported, almost as one, and the Gray Lensman sat down at a plate.

His mind, free at last to make the investigation from which it had been so long and so sternly barred, flew down into and through the dome, to and into that cryptic globe so tantalizingly poised in the air of the Center.

The reaction was practically instantaneous; so rapid that any ordinary mind could have perceived nothing at all; so rapid that even Kinnison's consciousness recorded only a confusedly blurred impression. But he did see something: in that fleeting millionth of a second he sensed a powerful, malignant mental force; a force backing multiplex scanners and subethereal stress-fields interlocked in peculiarly unidentifiable patterns.

For that ball was, as Kinnison had more than suspected, a potent agency indeed. It was, as he had thought that it must be, a communicator; but it was far more than that. Ordinarily harmless enough, it could be so set as to become an infernal machine at the vibrations of any thought not in a certain coded sequence; and Helmuth had so set it.

Therefore at the touch of the Patrolman's thought it exploded: liberating instantaneously the unimaginable forces with which it was charged. More, it sent out waves which, attuned to detonating receivers, touched off strategically placed stores of duodecaplylatomate. "Duodec," that concentrated essence of atomic violence than which science has even yet failed to develop a more devastating!

"Hell's—jingling—bells!" Port Admiral Haynes grunted in stunned amazement, then subsided into silence, eyes riveted upon his plate; for to the human eye dome, fortress, and planet had disappeared in one cataclysmically incandescent sphere of flame.

But the observers of the Galactic Patrol did not depend upon eyesight alone. Their scanners had been working 

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