Six days after that momentous meeting of the council, a mighty fleet of air-boats rose and circled above the city. The character of the invisible force-shield above the city had been altered to allow the passage of any air-boat through it, and now no less than five hundred of the air-boats hovered over Kom. In design they were much like the ones I had vaguely glimpsed in the city of cylinders, long and flat and narrow, pointed at either end and with a low wall around their sides for the protection of their occupants. The people of Kom had worked wonders in those six days, thus to construct half a thousand of the flying cars, and to equip them with a time-wave apparatus like our own. Every car was thus equipped, the apparatus on each being a direct copy of that in our own car. Lantin and I

