LIEUT. GERVAIS RAOUL LUFBERY, an “Ace” of the Lafayette Escadrille, has brought down his thirteenth enemy airplane. The German machine was first seen by Lufbery—who was scouting—several hundred yards above him. By making a wide detour and climbing at a sharp angle he maneuvered into a position above the enemy plane at an altitude of five thousand yards and directly over the trenches. The German pilot was killed by Lufbery’s first shot and the machine started to fall. The gunner in the German plane quickly returned the fire, even as he was falling to his death. One of his bullets punctured the radiator and lodged in the carburetor of Lufbery’s plane, and he was forced to descend. To a writer in the Philadelphia _Public Ledger_ Lufbery describes the type of young man America will need for her air fleet. He says: “It will take the cream of the American youth between the ages of eighteen and twenty-six to man America’s thousands of airplanes, and the double cream of youth to qualify as chasers in the Republic’s new aerial army. “Intensive and scientific training must be given this cream of youth upon which America’s welfare in the air must rest. Experience has shown that for best results the fighting aviator should not be over twenty-six years old or under eighteen. The youth under eighteen has shown himself to be bold, but he lacks judgment. Men over twenty-six are too cautious. “The best air fighters, especially a man handling a ‘chaser,’ must be of perfect physique. He must have the coolest nerve and be of a temperament that longs for a fight. He must have a sense of absolute duty and fearlessness, the keenest sense of action and perfect sight to gain the absolute ‘feel’ of his machine. “He must be entirely familiar with aerial acrobatics. The latter frequently means life or death. “Fighting twenty-two thousand feet in the air produces a heavy strain on the heart. It is vital, therefore, that this organ show not the slightest evidence of weakness. Such weakness would decrease the aviator’s fighting efficiency. “The American boys who come over here for this work will be subject to rapid and frequent variations in altitude. It is a common occurrence to dive vertically from six thousand to ten thousand feet with the motor pulling hard. “Sharpness of vision is imperative. Otherwise the enemy may escape or the aviator himself will be surprised or mistake a friendly machine for a hostile craft. The differences are often merely insignificant colors and details. “America’s aviators must be men who will be absolute masters of themselves under fire, thinking out their attacks as their fight progresses. “Experience has shown that the ‘chaser’ men should weigh under one hundred eighty pounds. Americans from the ranks of sport—youths who have played baseball, polo, football, or have shot and participated in other sports—will probably make the best chasers.”