That night, as electricity began to fail in the city, the surviving people undertook to leave en masse. They had no stomach for another day such as they had passed through. An additional factor urged them on. During the years of the Atomic Age they had been living--like people of every city--with keen, increasing queasiness. It is not conducive to urban content to know that any of a dozen foreign governments can, or potentially can, blot out you and yours in an eye-twinkling. Indeed, for many years, people had been trickling away from cities everywhere--either openly giving their reason or offering some excuse. Finally, from the very onslaught of B Day, there had poured forth a succession of orders setting up various official hierocracies for the emergency--deputy police, wardens, and so on, along with the rationing of gasoline, restrictions on subway use, abrogation of power supply, and other such matters. Americans are not a patient people and of all Americans, New Yorkers are the most impatient. Unlike Britains, Russians, and Europeans, they had never accepted the brash contempt of the public exhibited continually both by government and industry after World War II. Nor had they become reconciled to bureaucratic rule. They had resented the multiplication of authorized agents and official personnel. Hence, not being schooled to such vicissitudes at the time of B Day, they lost their tempers. They left town. By midnight, the tunnels, bridges, and ferries could no longer be held open for the evacuation of casualties. By three in the morning, every bridge and every tunnel and every boat was swarming with one-way, antlike movement as New Yorkers abandoned New York. All the next day the human tide welled into metropolitan environs. The contagion spread to other cities as words began to form above them and in some instances even before their skies developed a C or a J or a P or an A or the like. Terror begat terror. Various metropolises were soon without electricity, water, food, gasoline, and so on. Fires began to rage in them. In no time, Cleveland, Detroit, Birmingham, Boston, Los Angeles, and other centers were in a condition like that of cities over which a powerful enemy has gained absolute control of the air.