Twelve o'clock struck! A gunshot suddenly pealed forth and shot its flame into the air. Twelve hundred melting-troughs were simultaneously opened and twelve hundred fiery serpents crept towards the central well, unrolling their incandescent curves. There, down they plunged with a terrific noise into a depth of 900 feet. It was an exciting and a magnificent spectacle. The ground trembled, while these molten waves, launching into the sky their wreaths of smoke, evaporated the moisture of the mould and hurled it upwards through the vent-holes of the stone lining in the form of dense vapour-clouds. These artificial clouds unrolled their thick spirals to a height of 1000 yards into the air. A savage, wandering somewhere beyond the limits of the horizon, might have believed that some new crater was forming in the bosom of Florida, although there was neither any eruption, nor typhoon, nor storm, nor struggle of the elements, nor any of those terrible phenomena which nature is capable of producing. No, it was man alone who had produced these reddish vapours, these gigantic flames worthy of a volcano itself, these tremendous vibrations resembling the shock of an earthquake, these reverberations rivalling those of hurricanes and storms; and it was his hand which precipitated into an abyss, dug by himself, a whole Niagara of molten metal! CHAPTER XVI. THE COLUMBIAD. Had the casting succeeded? They were reduced to mere conjecture. There was indeed every reason to expect success, since the mould had absorbed the entire mass of the molten metal; still some considerable time must elapse before they could arrive at any certainty upon the matter. The patience of the members of the Gun Club was sorely tried during this period of time. But they could do nothing. J. T. Maston escaped roasting by a miracle. Fifteen days after the casting an immense column of smoke was still rising in the open sky and the ground burnt the soles of the feet within a radius of 200 feet round the summit of Stones Hill. It was impossible to approach nearer. All they could do was to wait with what patience they might. "Here we are at the 10th August," exclaimed J. T. Maston one morning, "only four months to the 1st of December! We shall never be ready in time!" Barbicane said nothing, but his silence covered serious irritation. However, daily observations revealed a certain change going on in the state of the ground. About the 15th August the vapours ejected had sensibly diminished in intensity and thickness. Some days afterwards the earth exhaled only a slight puff of smoke, the last breath of the monster enclosed within its circle of stone. Little by little the belt of heat contracted, until on the 22d August Barbicane, his colleagues, and the engineer were enabled to set foot on the iron sheet which lay level upon the summit of Stones Hill. "At last!" exclaimed the President of the Gun Club, with an immense sigh of relief.