Considered from this standpoint, the question is repeated: can aeroplanes be used to kill the other fellow? Well, where may we expect to meet this other fellow? He will be armed, of course. He will be on the ground, on the water, or in the air. Wherever he may be we must get close enough to see him, while we must remain far enough away to keep him from having a decidedly better chance of hitting us than we have of hitting him. If he is on the ground or on the water we must fly over him. If he is in the air we must manoeuvre our air craft so as to gain an advantageous position over him; one where we can shoot our machine guns or rifles while he is unable to use his similar weapons against us. That is where skill as an aviator and superiority of speed, climbing powers, and control of the machine will play a prominent part in deciding the supremacy of the air. From the standpoint of the location of the enemy the problem can be reduced to two cases: one, when the enemy is on the ground or on the water, and the other when he is in the air. Against him in the first case we must use projectiles dropped from on high. These may be shrapnel, explosive shells or simply large, thinly encased masses of high explosive, depending on whether we are attacking individuals or animals in groups; gun emplacements, bridges, etc., or important strategical or tactical points such as arsenals, barracks, or parts of a defensive line. Against the enemy in the skies we must use some small machine gun or rifle, in an endeavour to brush him aside and allow our own information-gathering aeroplanes to perform their functions unmolested. But we are not progressing. Can aeroplanes be used to kill the other fellow? Well, assuming him to be located as we have assumed him to be, there are several other questions which must be answered before we can clinch the main issue. Can a man act as aviator and at the same time manipulate the mechanism that may be found necessary to the killing of the other fellow? If not, can an aeroplane be built that will carry at least two men, one as aviator and the other as manipulator of the death-dealing apparatus, and, at the same time, carry enough extra weight, i. e., fuel, to keep aloft long enough to accomplish the necessary flight and also carry the projectiles and dropping device? Yes. The two passengers may be estimated to weigh three hundred pounds. The dropping device may be estimated to weigh not to exceed fifty pounds. At least three known types of aeroplane carry six hundred and fifty pounds of weight for a continuous flight of two hundred miles in length. That leaves two hundred and fifty pounds that can be devoted to the carrying of projectiles.