beneficial to stout people as walking."

"Well, bring it on, bring it on," exclaimed Reddy. "We are waiting patiently."

"Curb your impatience, Sorrel Top," said David. "Just follow me, and see what I have to show you."

They helped little Mrs. Gray, who was nimble in spite of her years, through a broken gap in the wall of the Omnibus House. The old ruin was more picturesque than, ever in its cloak of five-leafed ivy which the autumn had touched with red and gold. A lean-to had been built against the back wall of the building, fitted with a stout door on the inside and a pair of doors on the outside.

"I rented this plot of land from the farmer who owns the orchard," explained David, taking a key from his pocket and opening the door in the stone wall. "This was about the best place I could think of for experiments, partly because it's such a lonesome place, and partly because there is a clear open space of several hundred yards back here without a tree or bush on it."

It was dark inside until he had opened the double doors in the opposite wall, when the slanting light showed them an aëroplane; not a little gymnasium model this time, but a full-fledged flying machine, a trim and graceful object, even at close view.

"David," cried Anne joyously, "you don't mean to say you've gone and done it at last?"

"I have," answered David gravely; "and I've made two trips with pretty good success each time."

Then everyone talked at once. David was the hero of the hour.

"David, my dear boy," cried Mrs. Gray. "To think that I should live to see you an aviator!"

"I'm a long way from being one, yet, Mrs. Gray," answered David. "My bird doesn't always care to fly. There are times when she'd rather stay in her nest with her wings folded. Of course, I haven't nearly perfected her yet, so I don't want it mentioned in town until I get things in shape. But I couldn't wait until then to show it to you, my dear friends, because you were all interested in it last year."

"Well, well, come on and fly," cried Hippy. "My heart is palpitating so with excitement that I am afraid it will beat once too often if something doesn't happen."

"I was waiting for my helper," answered David, "but he appears to be late. You boys will do as well."

"Who is your helper, David?" asked Anne.

"You could never guess," he replied smiling, "so I'll have to tell you. It's old Jean, the hunter."

"Why, the dear old thing!" cried Grace. "To think of him leaving his uncivilized state to do anything so utterly civilized and modern as to help with a flying machine."

"And he does it well, too," went on David. "He is not only thoroughly interested but he keeps guard out here in case any one should try to break in. There are his cot and things in the corner. He sleeps in the open unless it rains. Then he sleeps inside."

As the old hunter did not put in an appearance David decided to wait no longer.

"Why can't we all help?" asked Grace. "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 aëroplane, 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. He did not notice that little Mrs. Gray's knees had suddenly refused to support her, nor that she had sat flat on the ground in a state of utter bewilderment at the sight of his sudden flight. David looked far across at the beautiful rolling meadows, and fields dotted with farmhouses and cottages. How he loved the fertile valley, with its little river winding in and out between green banks! It was all so beautiful, but it was time to descend. He must not give his pet too much liberty, or he might rue his indiscretion. He headed his machine for the open space back of the Omnibus House, and began the descent. Then, something snapped, and he fell. He remembered as he fell the look of horror on the up-raised faces of his friends, and then everything became a blank.

It all happened in a flash, much too quickly to do anything but stand and wait until the aëroplane had crashed to the ground, but it seemed much longer, and Anne remembered later that she had felt a curious impulse to run away and hide. If David were to meet his death through this new toy, she could not endure to stay and see it happen.

But David was far from dead. He was only stunned and dizzy from the swift descent. He had not been high enough from the ground when the accident occurred to sustain serious injuries. They lifted him from the machine and laid him upon the grass, while Reddy ran to the brook and brought back his cap filled with water.

Mrs. Gray produced her smelling salts which she always carried with her. "Not for my own use, my dears," she always said, "but for the benefit of other people."

Reddy loosened David's collar and dashed the water into his face; while Hippy chafed the unconscious boy's wrists.

Presently David opened his eyes, looking vaguely about. He had a confused idea that something had happened to him, but just what it was he could not think. He looked up into the anxious faces of his friends who stood around him. Then he remembered.

"I'm not hurt," he said in a rather weak voice. Then he sat up and smiled feebly at the company. "I just had the wind knocked out of me. I am sure no bones are broken. How about my pet bird? Has she smashed her little ribs?"

"No, old fellow," exclaimed Hippy in a reassuring tone, for Hippy had never been able to endure the sight of suffering or disappointment. "Her wings are a good deal battered, that's all. But are you all right, old man?" he added, feeling David's arms and legs, and even putting an ear over his heart.

"It's still beating, you foolish, old fat-head," said David, patting his friend affectionately on the back.

In the meantime Anne had helped Mrs. Gray to her feet.

"I declare, I feel as though I had dropped from the clouds myself," said the old lady, wiping her eyes. "I am so stunned and bewildered. David, my dear boy, if you had been seriously hurt I should never have forgiven myself for allowing you to fly off like that. What would your poor mother say if she knew what had happened?"

"It won't be necessary to break the news to her, Mrs. Gray," said David. "I shall be as good as new inside of a few minutes. It's my poor little bird here who has received the injuries. Look at her poor battered wings! I think I know just what caused my sudden descent though, and I'll take care it doesn't happen again."

David then began a minute examination of his damaged pet, and soon located the trouble. His friends listened, deeply interested, as he explained the principles of aviation, and showed them how he had carried out his own ideas in constructing his aëroplane. Grace, who had a taste for mechanics, asked all sorts of questions, until Hippy asked her if she intended building an aëroplane of her own.

"I may," replied Grace, laughing. "You know that girls have as much chance at the big things of the world to-day, as boys."

"Well, if you do, let me know," responded Hippy, "and I'll write an epic poem about you that will make the world sit up and take notice."

"Then I am assured of fame beforehand," laughed Grace.

"Look!" said Nora suddenly. "Who are those people