f it again. I'm glad
of it, too, because they'll let our power plant alone now. Well, let's
get going--we've got to make things hum for a while!"

"Why all the rush? You just said that we have scared them away for
good."

"The savages, yes, but not those others. We've just turned loose enough
radiation to affect detectors all over the system, and it's up to us to
get this beam projector set up, get away from here, and get our power
shut off before they can trace us. Snap it up, ace!"

The transmitter unit was installed at the converters, the cable was torn
out, and, having broken the last material link between it and Ganymede,
Stevens hurled the "Forlorn Hope" out into space, using the highest
acceleration Nadia could endure. Hour after hour the massive wedge of
steel bored outward, away from Jupiter; hour after hour Stevens' anxious
eyes scanned his instruments; hour after hour hope mounted and relief
took the place of anxiety as the screens remained blank throughout every
inquiring thrust into the empty ether. But they knew they would have to
keep sharp vigilance.

* * * * *

_Continuing a Thrilling New Serial of Interplanetary Life and Travel
by Edward E. Smith, Ph.D._

_Author of "Skylark of Space," and "Skylark Three"_

PART II

Spacehounds of IPC

_One of the most fascinating mysteries of the heavens is the comet.
It goes through space, gets near enough to the earth to be seen,
and then goes off and disappears in celestial distance. Often it
has a hyperbolic orbit, which would make it impossible to come back.
Yet it may return--apparently contradicting the geometry of conic
sections. This only goes to prove once more that it is risky to say
anything is impossible--even that our hero of this story manages
beautifully, with the aid of Cantrell's Comet, to avoid complete
annihilation while stranded in interstellar space._

_Read "what went before" and then continue the second instalment._

What Went Before:

The Interplanetary Vessel Arcturus sets out for Mars, with
Breckenridge as chief pilot, carrying on board, besides its
regular crew and some passengers, the famous Dr. Stevens,
designer of space ships and computer. He checks computations
made by astronomers stationed in floating observatories, and
after he has located any trouble and suggests a plan for
minimizing the hazards of the