There followed a long spell of civil war, revolutions that cut their numbers down fantastically and at last came near to exterminating the Graken entirely. While they were repopulating their double homelands, they made a peace among themselves that was never again broken. To assure it, they invented the headgear which broadcast their thoughts, and in a generation or two they had become a kind of ant horde, billions of individuals conditioned to a kind of community thought, a way of life in which every idea of every individual was passed on to those near him, shared and refined amongst so many thousands that a giant race-mind at last made its appearance, and no single Graken ever felt that _he_ had conceived anything, but that _they_ had done it. This conjoint cerebration did not reach through space from planet to planet, and so the single-mindedness of the Graken was kept on its track by constant emissaries from one half of the race to the other. Now a new terror arose for them: the rodents on which they had fed, a breed of beast even more amazingly fertile than the Graken themselves, were decimated by a plague; and nourishment became so scarce that extinction was threatened. Of course there were no rich and poor among the Graken, no money and no privilege, any more than there would be among a queenless ant tribe. So as one grew hungry, they all did. They might have fed half their people and let the other half starve, but that was not the Graken way. Now, at this most crucial time of their history, the secret of sub-space was finally discovered, and the relatively simple manner of intratime interstellar journeying ascertained. Patrols were sent out in the old-style bullet-craft, but due to a lack of manual maneuverability in entering and leaving the galaxies now opened to them, the casualties were nine ships out of each ten sent out from Chwosst. Even so, another habitable planet was found within a matter of a few Earth-months, and food (composed of the "inferior races" found thereon) brought back to the hungry system of Lluagor. * * * * * The saucer-shaped spacecraft were developed and fleets, so numerous that each of the three worlds became hardly more than a vast landing-ground, were built. Two of every three able-bodied male Graken were trained as pilots, navigators, technicians and attack-masters. Patrols of from ten to fifty thousand ships left the base planets regularly, cutting through dimensions of sub-space in a search for new worlds that was of necessity haphazard, and yet which regularly discovered habitable globes in the limitless reaches of the universe.