She was buoyant, even with all the weight of ballast and the restraining hands of scores of men who volunteered to help lift the motor ship out and into position. The big gas bag tugged and swayed in the network of cords as if anxious to be free.

There was some little delay at the start, and Mr. Glassford took advantage of it to give the motor another test. The crowd leaped back in alarm as a series of sudden explosions sounded from the machine, and the big propellers revolved slowly, for the full speed gear was not thrown into place.

“I guess it’ll do,” said Mr. Glassford at length. “Now, I wish they’d start.”

But it appeared that one of the ships had developed a small defect at the last moment, and it was announced that the start would be delayed an hour. Mr. Glassford and the boys entered the cabin of their motor ship and sat down.

All at once there was excited shouting off to their left. The crowd began to run in that direction.

“Something’s happened!” exclaimed Bob, hurrying from the cabin.

“It does sound so,” admitted Jerry.

The shouting came nearer. Then the crowd approached closer to the anchored Comet. A moment later something big and shining, with monstrous, flapping wings, and which emitted a sound like a battery of Gatling guns in action, seemed to rush past the motor ship.

“It’s a new animal! It’s a wonderful new animal!” cried Professor Snodgrass, grasping his butterfly net. “I must have it for my collection.”