"This," explained Ralph, "is one of our many vacation cities that I hope will soon dot every part of the world. People are living entirely too intensely nowadays and with the many functions that they have to perform, with all the labor-saving devices they have, their lives are speeded up to the breaking point. The businessman or executive must leave his work every month for a few days, if he is not to become a wreck. Heretofore we have sent him to the mountain tops or to the seashore; there he found no rest. The noise, even on top of the mountains, due to aeroflyers and other vehicles, did not give a man a real rest. On our floating city there is absolute rest. There is no noise, no excitement, not even a radio telephone. "The city, 20,000 feet above the ground, is floating in perfectly clean and uncontaminated air. This air, while less dense than that further down, is renewed automatically every few hours. It is invigorating, just the same as mountain air with all its benefits. "The roof is made of steel lattice work, thick glass panes being fitted in between the steel frames. The shape is in the form of a huge dome covering the entire city, which measures about a little over a mile in circumference. The height of the center of the dome from the floor of the city is about 200 feet. At night the city is illuminated by cold light from high frequency wires running below the dome, similar to the system now used to light up our cities. "The floor upon which the entire city rests is steelonium, and the city is held up by means of anti-gravitational impulse. By neutralizing the gravity for the area below the floating city and a little beyond it, it is possible to keep the floating city at any distance from the earth. In other words, we use a gravitational 'screen,' and then build a city on top of this screen. "By charging the gravitational screen at a very high potential, we nullify gravity and as the city no longer has any weight it can be placed on any level and remain there practically indefinitely. A few air propellers keep the city from being blown away by storms or wind. "Although it was very cold in our aeroflyer as we came up, it is nice and warm on the streets here. Nor is there any artificial heating during the daytime. There is perpetual sunshine during the day at this level, at which practically no clouds ever form. "The city being entirely roofed over by the glass dome, and the interior being filled with air, the sun quickly heats up the atmosphere. Within two hours after the sun rises the air is balmy, and it would become stifling hot if the air was not renewed from time to time. Air is a poor conductor of heat, and if the air were not renewed, it would soon be 150 degrees in the shade. Cold air, however, from the outside, is continually drawn in so that an even temperature is maintained. Only at night is the city heated artificially, as without the sunlight at this altitude it soon becomes exceedingly cold.