How tiny, how frail they were: three boys darting in a man-made machine high above their own realm! What daring! What risks!

Daring, risks? Bill was unable to grasp the meaning of those earth-born words. He felt neither small nor frail. He, Bill Sherman, a boy, was among the conquerors!

At a signal from Ernest he increased the speed and soared upward. It is safer in the higher altitudes, although there is usually a great deal more wind blowing there. In case of any engine trouble, you have more time and a longer distance in which to bring the machine to the gliding angle. Also if you are flying over a city when trouble threatens, you have a chance to find a good landing place.

All of these things Bill had had lectured to him endlessly at Sill, and from both Ernest and Tom at school. But actual experience he had not had. That fact, however, he put resolutely behind him. Just one breath of fear struck him. He had witnessed a tail dive once at Sill, and over and over his mind kept repeating, "Keep the tail a little higher than the head and you won't spin." Ernest smiled to himself as he saw from Bill's manœuvers as the flight went on that he had stored away all the counsel he had listened to. Many a trained aviator never learned to drive his engine and balance his plane with the cool cleverness and judgment of this young and untried aeronaut. Ernest commenced to relax and enjoy himself. If they had no engine accident, there was no reason to suppose that Bill would wreck the plane.

"Up!" cried Ernest, pointing with his well hand.

Bill responded and the plane again soared aloft.

Here the wind screamed a gale. The plane shot forward, the wires whistling, the engine drumming, the whole light fabric in which they rode quivering. Bill's hand on the wheel grew tense; his faculties seemed on a wire edge. Ernest's guiding hand pointed to the right. Bill was surprised. He had kept good track of his direction by the aid of the air compass and felt sure he was going in the right direction. Nevertheless he turned and, banking his wings and lifting the ailerons, moved smoothly in the direction suggested. Half an hour later Ernest again motioned, this time for a turn to the left.

It was not until days after their arrival at Sill that Ernest thought to tell Bill that the unexpected and seemingly unnecessary deviations from the straight course were merely to try him out. An hour or so later when Ernest saw that they were passing over a strip of country where good landing places seemed plentiful, he indicated a dip and Bill executed it perfectly. He felt proud of himself now, and said, "Tail up, tail up!" repeatedly, as he felt the plane drop earthward. Reaching a lower level, Ernest nodded and they sailed on a straight-away flight, their eyes turned ever to the far-away goal in the west.

Bill was unconscious of the passing time. They had had a heavy and sustaining breakfast, and luncheon was forgotten. There was no time to stop if they had been hungry. But Ernest was thinking of many things.

He carefully scanned the country they were passing over for a landing place. Bill's face was well covered with the flaps of his helmet and the wings of his goggles, but Ernest fancied that the young aviator was pale. He felt that they must land for awhile. Even now they were many hours ahead of the time they would have made on a railroad train. He indicated an upward course, and Bill rose as they raced over a flat and open part of the country. Far ahead there lay what seemed to be an open plain dotted at long intervals with small villages. A pleasant farming district evidently, far from any large city. Ernest was sure that he could get gasoline in any hamlet, and there seemed to be plenty of landing places. The only question remaining was Bill's ability to get down without a smash. Ernest smiled. He was fatalist enough to be willing to risk what had to be risked.