With trains travelling at quite 200 miles an hour--and certainly nothing less will satisfy the remoter suburbanites of next century--frightful accidents would occur if precautions were not taken. The moment two trains are in the same section of line they will be automatically cut off from the source of power, and their brakes will at the same time bring them to a standstill. A passenger who put his head out of the window of a train travelling at this speed would be blinded and suffocated; so the windows will be glazed, the oxygenators 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 street-ways, 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 to another, automatic motor-cars will exist, coin-worked. A man who wishes to travel will step into a motor-car, drop into a slot-machine the coin which represents the hire of the car for the distance he wants to travel, and assume control. Here again the progress of man will come into play. Everyone will know how to drive a motor-car safely. If you doubt it, consider for a moment the position of a man of 1800 suddenly transported into a street of modern London. He would never be able to cross it; the rush of omnibuses, motors and bicycles would confuse and frighten him. Imagine the same man trying to use the underground railways of to-day, or to get up to town from a busy suburb in the morning. He would either be killed out of hand or left behind altogether from sheer inability to enter the train.