"Professor!" said Frank, speaking gently.

"Ha! ha!" muttered the inventor, as he threw over a lever and sent the Eagle scooting in a breathless sweep toward the earth. "She is like a bird! Up or down, to the right or left, she will sail in any direction."

"Professor!"

"Don't bother me now—don't bother me!" he almost snarled.

"I was a fool to take you along! I should have retained all the honor for myself. Now you will share it. It will be published all over the world that you accompanied Professor Scudmore on his trial trip in his wonderful air ship."

He glared at them a moment, as if he longed to cast them overboard, and then the handling of the craft claimed his entire attention.

"How do yez loike it, Frankie, me b'y?" asked Barney, with a sly nudge at his companion.

"It is decidedly uncomfortable."

"Phwat shall we do—jump th' son-av-a-goon at wance?"

"Nothing of the sort. We will keep still, as if we are quite satisfied and content. I will draw him into conversation when I think it proper, and he may be brought round all right."