eaders will also remember all the wonderful adventures and
the rollicking fun set forth in the second volume, under the title of
"_The Submarine Boys' Trial Trip_." In this book, bristling with
adventures, and made lighter, in spots, by accounts of humorous doings,
was told how the boys gained fame as submarine experts. It was their
fine, loyal work that interested the United States government in buying
that first boat, the "Pollard."

The third volume in the series, entitled "_The Submarine Boys and the
Middies_" told how our young friends secured the prize detail at
Annapolis; where, for a brief time, the three submarine boys served as
instructors in submarine work to the young midshipmen at the Naval
Academy. Nor was this accomplished without serious, and even sensational,
opposition from the representative of a rival submarine company. Hence
the boys went through some rousing adventures. Incidentally, they
fell against practical instruction in hazing at the Naval Academy.

Adventures enough had befallen the submarine boys to last any man for a
lifetime. Yet, as fate decreed it, Captain Jack Benson and his staunch
young comrades were now destined to adventures greater and further
reaching than any of which they could have dreamed. In advance, this
winter trip to Spruce Beach promised to be little more than a pleasant
relaxation for the youngsters. What it really turned out to be will
soon be made clear in the pages of this volume.

"It seems a very risky plan that you're trying, Jack," remarked Jacob
Farnum, at last.

"Don't you want me to do it, sir?" asked the young skipper, looking up
instantly from his chart.

"Why, er--"

But here David Pollard, the inventor of these boats broke in, eagerly:

"Of course we ought to do it, Farnum. Jack is wholly right. If we enter
the harbor at Spruce Beach in this fashion, and carry through our entire
plan successfully, what on earth can there be left for opponents of our
class of boats to say?"

"Not _if_ we succeed, of course," smiled Farnum. "It's only the pesky
little 'if' that's bothering me at all. I don't want any of you to
think me a coward--"

"We know, very well, you're not, sir," Captain Jack interposed, very
quietly.

"But if we make any slip in our calculations," continued Jacob Farnum,
"the first bad thing about it is that we'll smash a fine boat which,
otherwise, the United States Government is likely to want at a price
around two hundred