r required years to manufacture fuel for one trip. All
machinery was working at top efficiency, and they could turn out enough
of the liquid in a month, to drive the ship back and forth several
times. Crews of workmen had been trained to care for all mechanical
equipment, and there was no longer need for the engineers from the
earth.

The day the little party (it now consisted of eighteen with the four
children), entered the space ship tears rolled down the cheeks of many
of the crowd. The dome people had learned to almost worship these
members of an alien race, and thought they would never leave. But when
they realized that their leaders were dissatisfied, and wanted to return
to their native planet, they aided in every way they knew how.

The ship was out of port for less than a week when the people became
restless. They hardly spoke, even at meal time, and for the first time
in ten years there were petty quarrels.

When Barrow called them to the main cabin, they came grudgingly, then
slowly the expressions changed. Smiles appeared on their faces, and
their heads moved with sheepish nods of assent.

"We're fools, and you all know it. We were happy in the domes, happier
than we ever were in our lives before. We didn't appreciate it and
longed to return to the earth. We wanted to leave, yet had everything
there to live for. We had comfort, every pleasure, and more friends than
we can possibly have on our own world. _I feel ashamed!_

"Right now we _wish_ that we were back in our own apartments, and might
as well admit it. The earth is not what we want, _we want the domes_!
They are _home_!!!

"The best thing for us to do, now that we are on the way to the earth,
is establish commerce.

"We can create friendship between the planets, but we are natives of
Jupiter! Our interests will always be with the dome people. We have
almost become part of that race, and they have given us everything in
return. They even gave us our freedom when we wanted it. _We belong
there!_"

Ten years more passed, and John Barrow was beginning to help with his
father's work. Vacationing in Jupiter's domes had become so popular on
the earth that they were building another city to accommodate the
tourist trade. It was the third to be added to the original six.
Merchant ships were constantly discharging goods from the earth, and
carrying back rare metals.

Space ships from the earth, designed after the original Jupiter ship,
were searchi