"Our planet, as our enemy's, is encircled by a wide ring of floating cosmic debris," the alien said. "In both instances, the rings are remnants of what once may have been satellites. In the ring which encircles us, we have successfully secreted refrigerated, lead-sheathed stores of male sperm, quite impossible for our enemy to locate. That is a necessity, of course, for any race that is constantly at war and is obliged to take all possible safeguards to insure its continued existence. We assume that Thrayx has done the same. "However, our cell stores are useless if they lack ova to fertilize. On their last attack, Thrayxite ships succeeded in penetrating our innermost planetary defenses, and heavily damaged a number of our cities. Many of our women and young were victims. "We therefore evacuated our planet's entire female population to an uninhabited world far distant. It was a young world and covered with thick forests, much like the labor planetoid which circles Thrayx, and we believed our breeders would be quite sufficiently camouflaged." "Breeders?" Cain broke in. "Our philosophy concerning women is slightly different than your own," the alien said. And then he resumed, "But in our haste we underestimated our enemy's cleverness. Thrayxite scouts located the planet, destroyed it, our women, and our seeds. "And that is why you will take us to Earth, Lieutenant. We do not want your arms or your men. What we must ask for is--ten thousand of your women!" II A Cepheid Variable winked tauntingly at the edge of the Milky Way, the Large Magellanic Cloud strewn like diamonds in a vast cosmic spume behind it. It corruscated in glorious display as, far off, a great silvery ship of Space and a tiny jot of man-made metal resumed their headlong motion through the mighty legion of the stars. And then for an instant, the Cepheid's bright wink was dulled; eclipsed. A tapering streamlined shape slipped silently across it, and then was gone in the blackness, and the white dwarf resumed its brilliant display. But the commander of the Cepheid's interruptor had been giving little time to appreciation of the myriad beauties in the great darkness that had swallowed her ship. She had trebled her screens and had taxed her craft's colossal power installation to its limit, forcing it to absorb and reconvert every erg of radiant energy possible as it labored to maintain the awful output necessary to cling to the very edge of R-Space, barely clear of the E-continuum itself. She might have been an Amazon of Earth save for the great intelligence behind the high plane of her forehead, yet she was not without beauty, nor were those of her ship's complement. On their close-fitting uniforms were emblazoned the Planet-and-Circle insignia of their homeland, for they were of the galactic hosts of Thrayx. "They proceed toward a planet on the near side of this galaxy called Earth," the second officer said. "Their mission is to replenish their supply of breeders."