"We can try her that way first," said Tom. "Then, if it's O. K., we'll give her a hundred pounds or so."

"Now, Tom, be careful of that engine!" pleaded Dick. "It won't do to monkey too much."

"Oh, I'll be careful, Dick. I don't want to be blown up any more than you do."

"Remember the old saying, 'The more haste the less speed,'" warned the big brother.

It was with a peculiar thrill that Dick took his place in the wheelhouse and rang the bell for the engine to start. Tom, below, was equally excited as he turned on the power. There was a peculiar hissing and bubbling, but the propeller did not turn.

"What's the matter?" called down Dick, through the speaking tube.
"Didn't you hear my signal?"

He listened for a reply, but instead of Tom's voice he heard the fierce hissing of steam. Then, of a sudden, came a yell from Tom.

"Shut off that steam, Sam! Quick! or I'll be scalded to death!"

CHAPTER XVIII

IN PERIL OF STEAM