e result was
startling. The skipper took her calculations, studied them, frowned,
then permitted his face to expand into a wrinkled grin.

"Young lady, did you think this was Noah's Ark!" he demanded.

"No, sir. Wh--y?"

"Because according to your figures the 'Sister Sue' is at this minute
located on a line with Mt. Washington, off yonder in the White Range."

Harriet flushed to the roots of her hair as her companions shouted
gleefully. At last Harriet Burrell had found something that she could
not do. But the captain quickly informed them that to be able to take
observations accurately, and then figure them out, required long and
close application. Some mariners never were really good at theoretical
navigation. Nor had Harriet, as yet, mastered the principles of
trigonometry, which branch of mathematics underlies navigation.

On the following morning the sun came out, and by the time the camp
was awake the mainsails and jibs had been put out to dry. They were
permitted to swing free all day long and by nightfall were dry and
white, ready for the next sail. Captain Billy had promised them a long
sail, though not having told them where. That evening he consulted
with the Chief Guardian in her tent, with the result that the
Meadow-Brook Girls, Miss Elting and five of their companions were
told to prepare themselves for an early departure on the following
morning, provided the day were fair.

The girls were delighted, especially Harriet, who looked forward to
putting into actual practice the theories that she had learned. A full
day's provisions were put aboard, for these long sails could not be
made on schedule time in every instance. An early breakfast was eaten
by those who were to go on the sail, after which, bidding good-bye to
their companions who remained behind, the sailing party set out for
the beach, where Captain Billy was awaiting them with the small boat.
The passengers were put aboard in two loads, Harriet and Crazy Jane in
the first boat. The two girls set the jibs, which they had in place by
the time the skipper returned with the others of the sailing party.
They then hoisted the mainsail, and were under way a very few minutes
after the party was snugly aboard. The "Sister Sue" sailed out of the
bay to the accompaniment of fluttering handkerchiefs from the shore
and shrill cries of good-bye.

"I'll thend you a pothtal card from Europe," shouted Tommy.

The "Sue" dipped and heeled under the fresh br