Already, by aeroplane, a speed of 140 miles an hour has been reached--more than two miles a minute; and this represents no limit. Higher-powered engines are needed, and are now being built--although at the present time a motor giving 200 h.p. is approximately the best that can be obtained. What aeroplane constructors hope to procure, as soon as engine makers can provide them, are motors yielding thousands of horse-power--similar to those which are available for ships; and when such engines _are_ produced, although large sums must be expended upon their development, the possibilities of aviation will be almost beyond belief. Aeroplanes will leap in size from that of a cockleshell to a liner; we shall have huge aerial vessels which will carry hundreds of passengers; and within twenty years--seated in comfortable, Pullman-car saloons, 10,000 feet above the water--we shall be crossing the wide Atlantic in less than twenty hours. Already, as shown by the photograph on Plate XVI, it is possible to build a biplane which will carry a crew of nine. Air travel will have a luxury which is unknown by land or sea. Machines will rush forward with a smooth, vibrationless ease, and only the subdued hum from the power-plant, and the hissing of air past the polished hull, will indicate the speeds that are attained. In 1934, leaving London say on Friday in the afternoon, one will ascend in an air-liner and eat and sleep on board, arriving at New York on Saturday morning. Then, assuming you are a business man, and calls have been made and your interviews done, you will leave New York on Sunday afternoon and be in London again on Monday morning. There will be no more inconvenience in visiting America in the future, than there is to-day in going to Scotland or spending a week-end in Paris. Mr. Rudyard Kipling, picturing the coming of this air age, has said: “The time is near when men will receive their normal impressions of a new country suddenly and in plan, not slowly and in perspective; when the most extreme distances will be brought within the compass of one week’s--one hundred and sixty-eight hours--travel; when the word inaccessible, as applied to any given spot on the surface of the globe, will cease to have any meaning.”