and carbon-dioxide absorbers in each carriage keeping the air sweet, and other suitable appliances adjusting its temperature. There will be no such thing as level crossings; wherever the road crosses the line there will be bridges, provided with an endless moving track (like the automatic staircase at the Crystal Palace), to carry passengers and vehicles across. Of course horses will long since have vanished from the land, except as instruments of the pleasure of a few cranks who affect the manners of that effete period, the year 1900.
And the omnipresence of high-speed vehicles will in itself have eliminated much danger of accident. It is not to be supposed that the unresting march of mechanical improvement will have failed to have its effect on the people. Man himself will have progressed. He will be cleverer in avoiding accidents. Cities will be provided with moving streetways, always in action at two or more speeds; and we shall have learned to hop on and off the lowest speed from the stationary pavement, and from the lower speeds to the higher, without danger. When streets cross, one rolling roadway will rise in a curve over the other. There will be no vehicular traffic at all in cities of any size; all the transportation will be done by the roads' own motion. In smaller towns, and for getting from one town
