“I don’t know, Bertie. Watch and see,” replied the lady.

“I’m going to fly a little way, if I have luck,” said Jack to himself.

The attention of a considerable portion of the crowd was now drawn to him. With a heart that beat faster than usual, he went on with his grotesque preparations. Then he hauled the machine, which was very light, up on the platform.

There was a laugh as he spread out the big umbrella. Then, pretending to peer up to the sky, as if in search of storm clouds, Jack took his place on the suspended seat. The affair was so arranged that he could walk in it to the edge of the platform before he leaped off.

He recited a funny little verse, composed for him by Mr. Waddleton, containing references to the various airship inventors then in the public eye, stood poised for a moment on the edge of the platform, and then, hoping that everything was all right, and that he would land safely, he leaped off.

Down, down, down he sailed, the big umbrella buoying him up like a parachute. He kicked vigorously with his feet, and the big wings flapped up and down. The crowd burst into loud laughter and there was hearty applause.

Lower and lower Jack sank down, falling gently to the ground. He ceased to work the wings, and then came the climax. He pulled a string and there was a report like a small cannon, while the bag which was held apart with hoops and springs, collapsed, and the umbrella closed up with a snap. It looked exactly as if the imitation airship had blown up on reaching the ground, but this was only a trick Mr. Delafield had devised at the last moment.

My, what laughter and applause there was then! It was one of the oddest sights seen in the circus. Jack knew there was no doubt about it—he had made a hit.

CHAPTER XVIII
PROFESSOR KLOPPER APPEARS

“That’s the stuff!” cried Mr. Paine, running up to where Jack was getting out of the collapsed airship. This was the first the boy knew that the manager had been watching him. But there was very little that escaped the “old man.” “You’re doing good,” the manager went on. “Quick, now, on the other side. The people there are wondering what it’s all about. Here,” he cried to several men, “help get this platform over by the box and press seats. This is a good stunt!”