A molecular ray reached down for the city--and stopped halfway in a tremendous coruscating burst of light and energy. Yet there was none of the sheen of the ray screen. Merely light.
The fort was still driving downward. Then suddenly it stopped, and the side dented in like the side of a can some one has stepped on, and it came to sudden rest against an invisible, impenetrable barrier. A molecular reached down from somewhere in space, hit the ray screen of Ortol, which the Thessians had attacked for hours, and the screen flashed into sudden brilliance, and disappeared. The ray struck the Thessian fort, and the fort burst into tremendous opalescence, while the invisible barrier the ray had struck was suddenly a great sheet of flaming light. In less than half a second the opalescence was gone, the fort shuddered, and shrieked out of the planet's atmosphere, a mass of lux now, and susceptible to the moleculars. And everything that lived within that fort had died instantly and painlessly.
The fleet which had been preparing to follow the leading fort was suddenly stopped; it halted indecisively.
Then the _Thought_ became visible as its great golden letters showed suddenly, streaking up from distant space. Every ship turned cosmic and moleculars on it. The cosmic rebounded from the cosmium walls, and from the artificial matter that protected the eyes. The moleculars did not affect either, but the invisible protective sheet that the _Thought_ was maintaining in the Ortolian atmosphere became misty as it fought the slight molecular rebounds.
The _Thought_ went into action. The fort which remained was the point of attack. The fort had turned its destructive ray on the cosmium ship with the result that, as before, the cosmium slowly disintegrated into puffs of cosmic rays. The vapor seemed to boil out, puff suddenly, then was gone. Arcot put up a wall of artificial matter to test the effect. The ray went right through the matter, without so much as affecting it. He tried a sheet of pure energy, an electro-magnetic energy stream of tremendous power. The ray bent sharply to one side. But in a moment the Thessians had realigned it.
"It's a photonic stream, but of some type that doesn't affect ordinary matter, but only artificial matter such as lux, relux, or cosmium. If the artificial matter would only fight it, I'd be all right." The thought running through Arcot's mind reached the others.