"Just a business matter," he announced to Mary and her mother,
when he rejoined them. "A gentleman with whom I expect to make a
submarine trip is at the house, and wants to consult with me
about details. He is getting anxious to start. Mr. Damon is
there, too."

"Blessing every thing he lays eyes on, I suppose," remarked
Mrs. Nestor, with a smile.

"Yes, and some things he doesn't see," agreed Tom. "He is going
with us on this submarine trip."

"Oh, Tom, are you going to undertake another of those dangerous
voyages?" asked Mary, in some alarm.

"Well, I don't know that they are particularly dangerous,"
replied Tom, with a smile. "But we expect to make a search for a
sunken treasure ship in a submarine. That's the vessel I'm
working on now," he added. "We're rebuilding the Advance, you
know, making her more up-to-date, and adding some new features,
including her name--M. N. 1."

"I suppose Mr. Damon's friend is getting anxious to make a
start, particularly as he has already invested several thousand
dollars in the project," went on the young inventor. "He formed a
company to pay half the expenses of the search, and they will
share in the~ treasure--if we find it," Tom said. "I wish Mr.
Damon, who holds most of the shares the promoter let out of his
own hands, had not gone into it, but, since he has, I'm going to
do the best I can for him."