drily. "Crazy fools trying to run away. Roads jammed. Work stopped. It leaked out about the planes being wiped out to-day, and everybody in three states has heard those eggs going off. You're the only living man who's seen that crawling thing and lived to tell about it. I've sent your stuff back. What's that about the thing on top?"

"I hid," said Sergeant Walpole, woodenly. "The Wabbly sent over gas-shells where the ships landed. Then it went on. Headin' west. It's got a crazy-lookin' dinkus on top like a searchlight. That moved, while the ships were catchin' fire an' crashin'. Just like a searchlight, it moved an' the ships went down. But the Wabbly didn't fire a shot."

The helicopter man's wrist flexed swiftly....

"Gawd!" said Sergeant Walpole in sudden agony. "Drop! Quick!"

The helicopter went down like a stone. A propeller shrieked away into space. Metalwork up aloft glowed dully red. Then there were whipping, lashing branches closing swiftly all around the helicopter. A jerk. A crash. Stillness. The smell of growing things all about.

"Well?" said the 'copter pilot.

"They turned it on us—whatever it is," said Sergeant Walpole. "They near got us, too."

A match scratched. A cigarette glowed. The Sergeant fumbled for a smoke for himself.

"I'm waiting for that metal to cool off," said the helicopter pilot. "Maybe we can take off again. They located us with a loop while I was sending your stuff. Damn! I see what they've got!"

"What?"

"A way of transmitting real power in a radio beam," said the 'copter man. "You've seen eddy-current stoves. Everybody cooks with 'em nowadays. A coil with a high-frequency current. You can stick your hand in it and nothing happens. But you stick an iron pan down in the coil and it gets hot and cooks things. Hysteresis. The same thing that used to make transformer-cores get hot. The same thing happens near any beam transmitter, only you have to measure the heating effect with a thermo-couple. The iron absorbs the radio waves and gets hot. The chaps in the Wabbly can probably put ten thousand horsepower in a damned beam. We can't. But any iron in the way will get hot. It blows up a ship at once. Your monocycle and your rifle too. Damn!"

He knocked the ash off his cigarette.

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