rept into a small interior corridor where a small light was
burning. The remains of two other guards lay here, close by the
doorway as though they had come running at Tugh's alarm, only to be
struck down.

It was horribly gruesome, here in the dimness with these bleached
bones which had been living men so recently. And it was nerve-breaking
to know that Tugh was doubtless here somewhere.

"Listen!" whispered Tina.

There was a crackling sound overhead, and then the blurred murmur of a
voice. An audible broadcasting transmitter was in operation.

"It's in the tower," said Tina swiftly. "Tugh must be there."

This was an infinite relief. We went to the top story, passing,
unheeding, another crumpled heap. Again we stood listening. The
transmitter was hissing and spluttering, and then shouting its
magnified human voice out into the night. It was Tugh up there. He was
calling audibly to his Robots, with words which would be relayed upon
all the local magnifiers in the city. Between the thunder cracks we
heard him plainly now.

"_This is your Master Tugh in the Power House. Robots, we are
triumphant! The city is isolated! No help can get in! Kill all humans!
Spare none! This night sees the end of human rule!_"

And again: "_When you want renewal, come along the top roadway of the
dam. The electric defenses are off. You can come, and I have your
renewers here. I have new batteries, new strength for you Robots!_"[4]

[Footnote 4: Tugh had been in the Power House before. He knew the
operations of its various controls. But he had come always by the
surface route; he had heard of the existence of the secret tunnel, but
had never before this night been able to find out where it was.]

"You stay here," I told Tina and Larry; "I'll go up there. I'll get
him now once and for all."

* * * * *

I reached the Power House roof. The storm tore at me. It was beginning
to rain. I was near the outer edge of the roof, and ten feet away
stood the oval tower. I saw windows twenty feet up, with dim lights in
them. Mingled with the storm was the hiss of the transmitter in the
top of the tower, and the roar of Tugh's magnified voice. He had
evidently been there only a brief time. From where I crouched on the
roof, I could see overhead, along the top edge of the dam looming
above me. The red Robot rays were everywhere in the city, but none as
yet showed along the dam's upper roadway.

I got into the tow