There is another class of fliers that will, undoubtedly, be of use in war time. These are the men to drive fast-flying, single-passenger machines for speedy messenger service between detached bodies of troops, or to drive the heavy ammunition or food-carrying aeroplanes to relieve a besieged place. These may well be chosen from the ranks of the civilian volunteers who would, without doubt, flock to our colours and standards at the whistle of a hostile bullet. There is plenty of room in war time for all of the aviators we can scrape together, be they civilian or military. Two new types of aeroplane have been alluded to in the last, preceding paragraph; the fast-flying, quick-climbing racer and the slow-going, heavy-weight carrier. We are of opinion that there should be three types in all for military purposes. Of greatest importance and in greatest numbers we should have the middle-class machines; those capable of staying in the air for at least three hours of continuous flight, while carrying two men and one hundred and fifty pounds extra, of either wireless apparatus or machine gun and ammunition. Such a machine will climb two thousand feet in ten minutes, will travel above fifty miles an hour on the level, is perfectly easy to manage, and forms the back-bone of the aerial fleet. One of these craft acting as a convoy, armed with a Benet-Mercier machine gun weighing about twenty pounds and with ample ammunition, could sweep the skies clean of hostile aeroplanes, while its mate, carrying reconnaissance apparatus and two officers, could gather the information which the Commanding General desires. The speed machine is for use as described above. The weight-carrying machine can carry about six thousand rounds of ammunition at a trip. Rifle cartridges weigh about one hundred pounds per twelve hundred rounds. This machine could carry enough emergency rations on one trip to subsist five hundred men for a day. It could make a speed of forty miles per hour with this weight and, in the course of a day, could, undoubtedly, make several trips of succour, provided the sending point were within fifty miles of the besieged place which is the usual case. And now, can an aeroplane be used to prevent the other fellow from killing us?