Thus far we have dealt solely with the influences of aviation upon warfare and upon commerce; but such influences will by no means be confined to these two phases; there are many other features in international life that the development of aeronautics will influence greatly. Foremost amongst them is that of travel. For the first few years the cost of travel in the air will be appreciably greater than is now the case. One of the leading aeronautical experts of the day has computed that, to run a commercial service of aircraft, to cover the heavy expenditure that will be incurred, and to allow for the wear and tear of machines, it will be necessary to make a charge of 1½_d._ per mile, or a 50 per cent. increase on the rates for present day travel by steamer and railway. Once the project is in full swing, however, and the initial outlay has been recovered, such charge will be reduced to one halfpenny per mile, or 50 per cent. less than present conditions. In the matter of speed and time, there will be a remarkable advantage; for example, some of the proposed air routes are London to New York in 18 hours, London to Capetown in 54, and London to Sydney (Australia) in four days. This added economy and speed will tempt the traveling public, and for that matter the non-traveling public further afield, and will serve greatly to help on education and the rapid development of the remotest of our colonies, thus drawing closer the bond of union between the different portions of our great Empire. Countries and tracts of land hitherto undeveloped and unknown will be opened up by the aerial explorer, and whole continents will, with the greatest ease, be policed by aeroplane and by airship. A FUTURE WAR WITH GERMANY Will this war be followed by an aerial war between Germany and Great Britain at a no distant date? This depends solely on the future course and the conclusion of the present war.