The guns rattled again. Clutching the blood-stained banner, he dropped across the body of his companion. Suddenly a broad band of black soared upward from the earth. Those in charge of the cylinders placed about the Capitol had released the gas. A band of darkness, rising into the blue, cutting off the earth, making the summit of the ruined Capitol a floating dome. But, fast as it rose, the invisible airships rose faster above it. A last vicious volley! Two of Dick's flight crashing down upon the piles of dead men underneath! And nothing was visible, though the darkness rose till it obliterated the blue above. * * * * * At dawn the Council sat, after an all-night meeting. Vice-president Tomlinson, one arm shattered by a machine-gun bullet, still occupied the chair at the head of the table. Outside, immediately about the White House, there was not a sound. Washington might have been a city of the dead. The railroad terminals, however, were occupied by a mob of people, busily looting. There was great disorder. Organized government had simply disappeared. Each man was occupied only with obtaining as much food as he could carry, and taking his family into rural districts where the Terror would not be likely to pursue. All the roads leading out of Washington--into Virginia, into Maryland, were congested with columns of fugitives that stretched for miles. Some, who were fortunate enough to possess automobiles, and--what was rarer--a few gallons of gas, were trying to force their way through the masses ahead of them; here and there a family trudged beside a pack-horse, or a big dog drew an improvised sled on wheels, loaded with flour, bacon, blankets, pillows. Old men and young children trudged on uncomplaining. The telegraph wires were still, for the most part, working. All the world knew what was happening. From all the big cities of the East a similar exodus was proceeding. There was little bitterness and little disorder. It was not the airship raids from which these crowds were fleeing. Something grimmer was happening. The murderous attack upon the populace about the Capitol had been merely an incident. This later development was the fulfilment of the Invisible Emperor's ultimatum. Death was afield, death, invisible, instantaneous, and inevitable. Death blown on the winds, in the form of the deadliest of unknown gases. * * * * * In the Blue Room of the White House a score of experts had gathered. Dick, too, with the chiefs of his staff, Stopford, and the army and naval heads. Among them was the chief of the Meteorological Bureau, and it was to him primarily that Tomlinson was reading a telegraphic dispatch from Wilmington, South Carolina: "The Invisible Death has reached this point and is working havoc throughout the city, spreading from street to street. Men are dropping dead everywhere. A few have fled, but--"