"Well—good-bye, Dad. Don't know when I'll be back. Maybe twenty-five thousand years from now, or twenty-five thousand years ago. But we'll get back somehow. And we'll clean out the Thessians!"

He entered the ship, and rose into space.

"Where are you going, Arcot?" asked Morey.

"Eros," replied Arcot laconically.

"Not if my mind is working right," cried Wade suddenly. All the others were tense, listening for inaudible sounds.

"I quite agree," replied Arcot. The ship turned about, and dived toward New York, a hundred thousand miles behind now, at a speed many times that of light as Arcot snapped into time. Across the void, Zezdon Fentes' call had come—New York was to be attacked by the Thessians, New York and Chicago next. New York because the orbits of their two forts were converging over that city in a few minutes!

They were in the atmosphere, screaming through it as their relux glowed instantaneously in the Heaviside layer, then was through before damage could be done. The screen was up.

Scarcely a minute after they passed, the entire heavens blazed into light, the roar of tremendous thunders crashing above them, great lightning bolts rent the upper air for miles as enormous energies clashed.

"Ah—they are sending everything they have against that screen, and it's hot. We have ten of our biggest tube stations working on it, and more coming in, to our total of thirty, but they have two forts, and Lord knows how many ships.

"I think me I'm going to cause them some worrying."