sense," she went on, as she detected a tendency on the part of some of
the young ladies to giggle.

"No, fifty dollars will be about right," went on Mr. Sharp, pulling
out a well-filled wallet. "I will pay you now."

"And if you will wait I will give you a receipt," continued the
principal, evidently as much appeased at the mention of a professor's
title, as she was by the money.

"We're getting off cheap," the balloonist whispered to Tom, as the
head of the seminary started down the scuttle to the class-rooms
below.

"Maybe it's easier getting out of that difficulty than it will be to
get off the roof," replied the lad.

"Don't worry. Leave that to me," the aeronaut said. It took
considerable to ruffle Mr. Sharp. .

With a receipt in full for the damage to the tower, and expressing the
hope that, some day, in the near future, Professor Swift would do the
seminary the honor of lecturing to the young lady pupils, Miss Perkman
bade Mr. Sharp and Tom good-by.

"Young ladies, to your rooms!" she commanded. "You have learned enough
of airships, and there may be some danger getting this one off the
roof."

"Wouldn't you like to stay and take a ride in it?" Tom asked Miss