A world’s tour is among the latest projects in automobilism. On April 29, 1902, Dr. Lehwess and nine friends started from Hyde Park Corner for a nine months’ tour on three vehicles, the largest of them a luxuriously appointed 24 horse-power caravan, built to accommodate four persons. Their route lies through France, Germany, Russia, Siberia, China, Japan, and the United States. HIGH-SPEED RAILWAYS. A century ago a long journey was considered an exploit, and an exploit to be carried through as quickly as possible on account of the dangers of the road and the generally uncomfortable conditions of travel. To-day, though our express speed is many times greater than that of the lumbering coaches, our carriages comparatively luxurious, the risk practically nil, the same wish lurks in the breast of ninety-nine out of a hundred railway passengers--to spend the shortest time in the train that the time-table permits of. Time differences that to our grandfathers would have appeared trifling are now matters of sufficient importance to make rival railway companies anxious to clip a few minutes off a 100-mile “run” simply because their passengers appreciate a few minutes’ less confinement to the cars. During the last fifty years the highest express speeds have not materially altered. The Great Western Company in its early days ran trains from Paddington to Slough, 18 miles, in 15-1/2 minutes, or at an average pace of 69-1/2 miles an hour. On turning to the present regular express services of the world we find America heading the list with a 50-mile run between Atlantic City and Camden, covered at the average speed of 68 miles an hour; Britain second with a 33-mile run between Forfar and Perth at 59 miles; and France a good third with an hourly average of rather more than 58 miles between Les Aubrais and S. Pierre des Corps. These runs are longer than that on the Great Western Railway referred to above (which now occupies twenty-four minutes), but their average velocity is less. What is the cause of this decrease of speed? Not want of power in modern engines; at times our trains attain a rate of 80 miles an hour, and in America a mile has been turned off in the astonishing time of thirty-two seconds. We should rather seek it in the need for economy and in the physical limitations imposed by the present system of plate-laying and railroad engineering. An average speed of ninety miles an hour would, as things now stand, be too wasteful of coal and too injurious to the rolling-stock to yield profit to the proprietors of a line; and, except in certain districts, would prove perilous for the passengers. Before our services can be much improved the steam locomotive must be supplanted by some other application of motive power, and the metals be laid in a manner which will make special provision for extreme speed.