"What must we do?
Please tell us." "All right," answered David, "just give it a shove into the open space, and you'll see how she gradually rises for a flight." After making a careful examination of all the parts of the aeroplane, and starting the engine, David took his seat in the machine.
Then the two boys, assisted by Grace and Nora, pushed it swiftly out into the broad open space back of the ruin.
Suddenly the machine began to rise.

Slowly, at first, then seeming to gather strength and confidence like a young bird that has learned to fly at last, it soared over the apple trees.

David, white, but very calm, quietly worked the levers that operated the little engine.

When he had risen about a hundred feet, he began to dip and soar around the orchard in circles.

He appeared to have forgotten his friends, watching anxiously below.