seat, flying above the hostile lines, daring a German airman to ascend and meet him in a duel to the death thousands of feet above the earth.
But just as he anticipated, Tom had to start at the bottom of the ladder again, and undo much that he had already learned. As for Jack, he began to despair of ever being able to master the intricate education that every French air pilot must pass through before he is allowed to go to the front.
Each one entering the school is placed where it is believed he will do the most effective work. One applicant may be better qualified to man a bombing plane than for the more dangerous calling of a fighting unit, where great dexterity and lightning-like quickness in making a decision mean everything.
The bombing planes are much larger and slower, for, as a rule, when going out on a long trip to damage the enemy's lines of communication these are fully protected by guards in the shape of Nieuport pilots, who will defend them against the enemy airmen, if such should rise to waylay them.
Tom went forward with astonishing rapidity. Day after day he was in the air, and his instructor took the greatest interest in his rapid progress, for he felt he had what he called a
