fuel to run and which could not do anything but mine.

When Huyghens and Roane reached them, they wept. They hated robots and all things robotic only a little less than they hated sphexes. But Huyghens explained, and armed them with weapons from the packs of the bears, and they marched to the dead colony with the male Kodiaks as point and advance-guard, and with Faro Nell bringing up the rear. They killed sixteen sphexes on the way. In the now overgrown clearing there were four more. In the shelters of the colony they found only foulness and the fragments of what had been men. But there was some food—not much, because the sphexes clawed at anything that smelled of men, and had ruined the plastic packets of radiation-sterilized food. But there were some supplies in metal containers which were not destroyed.

And there was fuel, which men could dispense when they got to the control-panels of the equipment. There were robots everywhere, bright and shining and ready for operation, but immobile, with plants growing up around and over them.

They ignored those robots. But lustfully they fueled tracked flame-casters—adapting them to human rather than robot operation—and the giant soil-sterilizer which had been built to destroy vegetation that robots could not be made to weed out or cultivate. And they headed back for the Sere Plateau, burning-eyed and filled with hate.

But Nugget became a badly spoiled bear-cub, because the freed men approved passionately of anything that would even grow up to kill sphexes. They petted him to excess, when they camped.

And they reached the plateau by a sphex-trail to the top. And Semper scouted for sphexes, and the giant Kodiaks disturbed them and the sphexes came squalling and spitting to destroy them—and while Roane and Huyghens fired steadily, the great machines swept up with their special weapons. The Earth-sterilizer, it was found, was deadly against animal life as well as seeds, when its diathermic beam was raised and aimed. But it had to be handled by a man. No robot could decide just when it was to be used, and against what target.

Presently the bears were not needed, because the scorched corpses of sphexes drew live ones from all parts of the plateau even in the absence of noticeable breezes. The official business of the sphexes was presumably finished, but they came to caterwaul and seek vengeance—which they did not find. Presently the survivors of the robot colony drove machines—as men needed to do, here—in great circles around the 

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