returned. We hastily sketched what had happened to
each of us.

It was Tugh who was the guiding evil genius of all these disasters!
Tugh, the exile of Time, the ruthless murderer in many eras! He was
here, very probably, in the Power House, a few hundred feet away.

And Tina, regarding that Power House with her returning clarity of
senses saw that its sending signal lights were off, which meant that
the air-power of the New York District was not being supplied. Help
from other cities could not arrive.

Tina stood up waveringly. "We cannot stay here like this!" she said.
"Tugh has killed the guards, and is there in control. The electrical
defenses are shut off; they must be! The Robots will soon be coming
along the top of the dam, for their battery renewers are stored in the
Power House. If they get them, this massacre will go on for days!--and
spread all over! We've got to stop them! We must get in the Power
House and capture Tugh!"

"But we have no weapons!" Larry cried. "And he must have that
white-ray, if he has killed the guards!"

"I have a weapon!" I said. I had suddenly recalled the cylinder in my
pocket. "I have a white-ray!"

* * * * *

A desperate madness was on us all. The lives of thousands of people
who might still be alive on Manhattan were at stake; and other
millions would be menaced if these Robots renewed their energy and
spread the revolt into other cities.

Over the roar, and the wind lashing us, I shouted:

"I promised Migul I would kill Tugh. I will!"

I turned toward Migul. But the Robot had vanished! Afraid, no doubt,
that we would want it to go with us after Tugh, the terrified
mechanism was hiding. We wasted no time searching for it.

We had all been half hysterical for these few moments, but we steadied
quickly enough as we approached the Power House's lower entrance. The
building was a rectangular structure some two hundred feet long. It
was fastened upon great brackets to the perpendicular side of the dam
and jutted out some fifty feet. It was two levels in height--a total
of about forty feet to its flat roof, in the center of which was set a
small oval tower. The whole structure was above us now; the catwalk
went close underneath it, passing through an arch of the huge
supporting brackets and terminating in a small lower platform, with an
open spiral staircase leading upward some ten feet into the lower
story.

The place seemed dark and desert