"What stopped it?" asked Hull.

"I do not know. They end, these pestilences. Those who take it and live cannot take it a second time, and those who are somehow immune do not take it at all, and the rest — die. The Grey Death swept the world for three years; when it ended, according to Martin Sair, one person in four had died. But the plague came back in lessening waves for many years; only a pestilence in the Ancient's fourteenth century, called the Black Death, seems ever to have equaled it.

"Yet its effects were only beginning. The ancient transport system had simply collapsed, and the cities were starving. Hungry gangs began raiding the countryside, and instead of one vast war there were now a million little battles. The weapons of the Ancients were everywhere, and these battles were fierce enough, in all truth, though nothing like the colossal encounters of the great war. Year by year the cities decayed until by the fiftieth year after the Grey Death, the world's population had fallen by three-fourths, and civilization was ended. It was barbarism now that ruled the world, but only barbarism, not savagery. People still remembered the mighty ancient civilization, and everywhere there were attempts to combine into the old nations, but these failed for lack of great leaders."

"As they should fail," said Hull. "We have freedom now."

"Perhaps. By the first century after the Plague, there was little left of the Ancients save their ruined cities where lurked robber bands that scoured the country by night. They had little interest in anything save food or the coined money of the old nations, and they did incalculable damage. Few could read, and on cold nights was usual to raid the ancient libraries for books to burn and to make things worse, fire gutted the ruins of all cities, and there was no organized resistance to it. The flames simply burned themselves out, and priceless books vanished."