And as he thought, an interfering force began to pluck at him; as though palpable tongs were pulling out of line the mental probe with which he was exploring the hitherto unplumbed recesses of his mind.
"Ah ... so you do not want me to remember?" Roger asked aloud, with no change in any lineament of his hard, gray face. "I wonder ... do you really believe that you can keep me from remembering? I must abandon this search for the moment, but rest assured that I shall finish it very shortly."
"Here is the analysis of his screen, sir." A Nevian computer handed his chief a sheet of metal, bearing rows of symbols.
"Ah, a polycyclic ... complete coverage ... a screen of that type was scarcely to have been expected from such a low form of life," Nerado commented, and began to adjust dials and controls.
As he did so the character of the clinging mantle of force changed. From red it flamed quickly through the spectrum, became unbearably violet, then disappeared; and as it disappeared the shielding wall began to give way. It did not cave in abruptly, but softened locally, sagging into a peculiar grouping of valleys and ridges—contesting stubbornly every inch of position lost.
Roger experimented briefly with inertialessness. No use. As he had expected, they were prepared for that. He summoned a few of the ablest of his scientist-slaves and issued instructions. For minutes a host of robots toiled mightily, then a portion of the shield bulged out and became a tube extending beyond the attacking layers of force; a tube from which there erupted a beam of violence incredible. A beam behind which was every erg of energy that the gigantic mechanisms of the planetoid could yield. A beam that tore a hole through the redly impenetrable Nevian field and hurled itself upon the inner screen of the fish-shaped cruiser in frenzied incandescence. And was there, or was there not, a lesser eruption upon the other side—an almost imperceptible flash, as though something had shot from the doomed planetoid out into space?
Nerado's neck writhed convulsively as his tortured drivers whined and shrieked at the terrific overload; but Roger's effort was far too intense to be long maintained. Generator after generator burned out, the defensive screen collapsed, and the red converter beam attacked voraciously the unresisting metal of those prodigious walls. Soon there was a terrific explosion as the pent-up air of the planetoid broke through its weakening container, and the sluggish river of allotropic iron flowed in an ever larger stream, ever faster.
"It is well that we had an unlimited supply of iron." Nerado almost tied a knot in his neck as he spoke in huge relief. "With but the seven pounds remaining of our original supply, I fear that it would have been difficult to parry that last thrust."
"Difficult?" asked the second in command. "We would now be free atoms in space. But what shall I do with this iron? Our reservoirs will not hold more than half of it. And how about that one ship which remains untouched?"