e sheet of ice, not unlike a heavy pane of glass,
under his arm.

"I've got a scheme," suggested Andy, with a broad grin. "We'll place
three of the sheets of ice in his bed under the sheet, and the others on
the floor here right in front of the door. Then he'll have a chance to
slide into the room."

"Wow! and maybe it won't be some slide!" chuckled Walt Baxter.

The sheets of ice were soon placed in the bed and covered with some of
the bedspreads, and the others were disposed on the hardwood floor
directly in front of the door inside the room. Then the cadets turned
out the lights, locked the door as before, and hurried away.

It was less than five minutes later when Dan Soppinger came rushing
upstairs, whistling in a peculiar manner. This was a signal that danger
was at hand.

"He just put the books away, and he's gathering up his papers,"
announced Dan. "I think he'll be upstairs in a few minutes more."

"All right, Dan, we're ready for him," announced Randy. "Now then,
fellows, if there isn't some fun when Asa Lemm enters his room, then I
miss my guess."

The joke that was to come off seemed to be too good to keep, and as a
consequence, after a hurried consultation, about a dozen other cadets
were let into the secret. All watched eagerly for the coming of
Professor Lemm, and there was a low whistle of warning went from room to
room when the hated teacher was seen to be mounting the stairs.

As was quite usual with him, Asa Lemm was not in good humor. He had been
hunting up a number of references in the library without his usual
success.

"This job of teaching is getting worse and worse," he grumbled to
himself. "It's too bad that I've got to waste my time on these boys. If
I could only get back some of that money I lost, I wouldn't spend
another hour over this tiresome task," and he heaved a deep sigh. The
loss of his little fortune was the one great sore spot with him.

He came swinging through the hall with long, rapid strides, and as he
did so the Rovers and their friends watched him from various doorways
and side halls. They saw him unlock his door and throw it open. The
next instant came a sudden yell of alarm, and then a tremendous bump.
Asa Lemm's feet had struck the sheets of ice on the floor, and they had
gone out from under him very suddenly, letting him down flat on his
back.

"Hi! hi! what's the meaning of this?" spluttered the teacher; and then,
as his hand struck the icy coldness of what