had been employing. "Have you figured us all out already, from a
standing start?"

"We know electricity, chemistry, physics, and mathematics fairly well.
You see, our race is many millions of years older than is yours."

"You're the man I've been looking for, I guess," said Seaton. "We have
enough of this metal with us so that we can spare you some as well as
not. But before you get it, I'll introduce you. Folks, this is Sacner
Carfon, Chief of the Council of the planet Dasor. They saw us all the
time, and when we headed for this, the Sixth City, he came over from the
capital, or First City, in the flagship of his police fleet, to welcome
us or to fight us, as we pleased. Carfon, this is Martin Crane--or say,
better than introductions, put on the headsets, everybody, and get
acquainted right."

Acquaintance made and the apparatus put away, Seaton went to one of the
store-rooms and brought out a lump of "X," weighing about a hundred
pounds.

"There's enough to build power-plants from now on. It would save time if
you were to dismiss your submarine. With you to pilot us, we can take
you back to the First City a lot faster than your vessel can travel."

Carfon took a miniature transmitter from a pouch under his arm and spoke
briefly, then gave Seaton the course. In a few minutes, the First City
was reached, and the _Skylark_ descended rapidly to the surface of a
lagoon at one end of the city. Short as had been the time consumed by
their journey from the Sixth City, they found a curious and excited
crowd awaiting them. The central portion of the lagoon was almost
covered by the small surface craft, while the sides, separated from the
sidewalks by the curbs, were full of swimmers. The peculiar Dasorian
equivalents of whistles, bells, and gongs were making a deafening
uproar, and the crowd was yelling and cheering in much the same fashion
as do earthly crowds upon similar occasions. Seaton stopped the
_Skylark_ and took his wife by the shoulder, swinging her around in
front of the visiplate.

"Look at that, Dot. Talk about rapid transit! They could give the New
York subway a flying start and beat them hands down!"

* * * * *

Dorothy looked into the visiplate and gasped. Six metal pipes, one above
the other, ran above and parallel to each sidewalk-lane of water. The
pipes were full of ocean water, water racing along at fully fifty miles
an hour and discharging, each stream a small water