de invulnerable to that weapon."

"I hope so, Stel Felso Theu," smiled Arcot. He was feeling better
already. "But do you know what that weapon is, Morey?"

"Got some readings on it with the _Banderlog_'s instruments, and I think
I do. Twin-ray is right," replied Morey.

"Hm-hm--so I think. It's a super-photon. What they do is to use a field
somewhat similar to the field we use in making cosmium, except that in
theirs, instead of the photons lying side by side, they slide into one
another, compounding. They evidently get three photons to go into one.
Now, as we know, that size photon doesn't exist for the excellent reason
that it can't in this space. Space closes in about it. Therefore they
have a projected field to accompany it that tends to open out space--and
they are using that, not the attractive ray, on us now. The result is
that for a distance not too great, the triple-ray exists in normal
space--then goes into another. Now the question is how can we stop it? I
have an idea--have you any?"

"Yes, but my idea can't exist in this space either," grinned Morey.

"I think it can. If it's what I think, remember it will have a terrific
electric field."

"It's what you think, then. Come on." Arcot and Morey went to the
calculating room, while Wade took over the ship. But one of the
ray-feeds had been destroyed, and they had three more in action, as well
as their most important weapon, artificial matter. Wade threw on the
time field, and started the emergency lead burner working to recharge
the coils that the Thessians were constantly draining. Being in their
own peculiar space, they could not draw energy from the stars, and Arcot
didn't want to return to normal space to discharge them, unless
necessary.

"How's the air pressure in the rest of the ship?" asked Wade.

"Triple normal," replied Morey. "The Thessian atmosphere leaked in and
sent it up terrifically, but when we went into our own space, at the
halfway point, a lot leaked out. But the ship is full of water now. It
was a bit difficult coming up from the _Banderlog_, and I didn't want to
breathe the air I wasn't sure of. But let's work."

They worked. For eight hours of the time they were now in they continued
to work. The supply of lead metal gave out before the end of the fourth
hour, and the coils were nearing the end of their resistance. It would
soon be necessary for Arcot to return to normal space. So they stopped,
their calculations very nearly com