To tabulate or chronicle accurately the losses and casualties suffered by the various armies in their aerial warfare is absolutely impossible. Not so much because of censorship or secrecy, but because of the fact that when an aeroplane is "driven down" by the French behind the German lines, it cannot be said that this aeroplane is actually destroyed or even damaged, or that its pilot has received a wound. Similarly when German machines attack and force a French or British machine to descend swiftly behind its own lines. The reporting of machines "driven down" among those "destroyed" is the cause of all the discrepancies between the official reports of the contending forces. The following figures have been gathered with the greatest care from the British "Roll of Honor," covering the killed, missing and wounded members of the Royal British Flying Corps. They are for the month of February, 1916, a month of comparative quiet, and there can be no doubt that proportionately larger casualty lists could be compiled from the more active months of the summer of 1916. The first week of February resulted in nine officers killed, one wounded, and five "missing"; two noncommissioned officers were also reported "missing." The second week six officers were killed, two wounded, while one noncommissioned officer was killed and another wounded. During the third week three flight lieutenants were killed, five wounded, and two captured by the enemy, while eight noncommissioned officers were wounded. In the last week of the month there were three officers killed, five wounded, and six "missing," while three noncommissioned men were listed as killed. The total losses for the month on the short battle line held by the British forces were therefore: twenty-one officers killed, thirteen wounded, and thirteen missing; fifteen noncommissioned officers killed or wounded. The losses among German aviators, taken from the regularly published casualty lists issued by the German Government, were twenty-four killed, and eleven wounded, during the month of January. The casualty lists become a deep mystery when compared with the losses of machines admitted by the respective war departments. During the month of February, for instance, the British announced the loss of _six_ aeroplanes--yet the casualty lists showed a loss of sixty-two officers and men! During the same month the French lost six machines, the Germans eight, the Russians three, Austria one, and Italy one. Statistics for the four months from April to July, 1916, gathered from the periodical press of Great Britain and Germany, and probably far more accurate than the occasional "estimates" made by the war departments themselves, show the following losses in officers killed in aerial combats: _April_--British 18, French 15, Russian 7, Italian 3; German 16, Austrian 3, Turkish 1, Bulgarian 0. _May_--British 16, French 11, Russian 5, Italian 4; German 10, Austrian 5, Turkish 0, Bulgarian 0.