e power-plant, walked along the triplex
lead and joined his followers at its terminus. Pointing with his horns,
he jabbered orders and three red monsters, one at each cable, bent to
lift the plug, while the leader himself thrust an arm into each of the
three contact holes. There was a flash of searing flame and the reeking
smoke of burning flesh--those three arms had taken the terrific no-load
voltage of the three-phase converter system, and the full power of the
alternator had been shorted directly to ground through the comparatively
small resistance of his body.

Stevens had poised the "Forlorn Hope" edgewise in mid-air, so that
the gleaming, heavily armored parabolic reflectors of his projectors,
mounted upon the leading edge of the fortress, covered the scene below.
As the charred corpse of the savage chieftain dropped to the ground,
it seemed to the six-limbed creatures that the demons of the falls had
indeed been annoyed beyond endurance by their intrusion; for, as if in
response to the flash of fire from the power plug, that structure so
peculiarly and so stolidly hanging in the air came plunging down toward
them. From it there reached down twin fans of death and destruction: one
flaming and almost invisibly incandescent violet which tore at the eyes
and excruciatingly disintegrated brain and nervous tissues; the other
dully glowing an equally invisible red, at the touch of which body
temperature soared to lethal heights and foliage burst cracklingly into
spontaneous flame.

In their massed hundreds, the savages dropped where they stood, life
rived away by the torturing ultra-violet, burned away by the blast
of pure heat, or consumed by the conflagrations that raged instantly
wherever that wide-sweeping fan encountered combustible material.
In the face of power supernatural they lost all thought of attack or of
conquest, and sought only and madly to escape. Weapons were thrown away,
the catapults were abandoned, and, every man for himself, the mob fled
in wildest disorder, each striving to put as much distance as possible
between himself and that place of dread mystery, the waterfall.

"Well, I guess that'll hold 'em for a while," Stevens dropped their
craft back into its original quarters in the canyon. "Whether they ever
believed before that this falls was inhabited by devils or not, they
think so now. I'll bet that it will be six hundred Jovian years before
any of them ever come within a hundred kilometers o