se for delay, and as all were anxious to get off as
quickly as possible, the two craft were boarded. The hatch of the
submarine was left open for the present, for it was the intention of the
ensign to run "awash," as it is called.

The motor boat running very nearly as fast as the submarine, they kept
each other company down the coast with little difficulty. It was fine,
exciting sport in the motor boat as it cut its way over the swells,
hurling spray and water out to either side of its sharp bow. If only the
boys had had Rob with them, they would have enjoyed it much more,
though.

All that was visible of the submarine was the top of her conning tower,
and the slender, needle-like "eye" of the periscope. The water surged
round her conning tower as she rushed along, for all the world like
some sea monster speeding on an errand of destruction. She was not going
full speed, for the ensign wished to keep company with the motor boat.

At noon, just as the lads on the motor boat were settling down to lunch
cooked on a blue-flame stove, a head was thrust out of the conning
tower. It was that of Mr. Barr.

"We are going to run under the surface in a short time," he said; "just
follow your same course, and you'll pick us up when we rise again."

"All right," shouted Tubby, his mouth full of ham sandwich, which he
held in one hand, while with the other he clasped a big wedge of pie.

The hatch on top of the conning tower closed shortly after with a
metallic "clang." The next instant the craft vanished from view in a
swirl of water. For a time the tip of the periscope tube, which was
twenty-five feet long, projected above the surface; then that, too,
vanished, and the motor boat was alone on the ocean.

On board the submarine the lads were enjoying themselves as much as
their fellow Scouts on the motor boat. This second experience was even
more novel and enjoyable than their first dive. Mr. Barr sat in the
cabin reading some scientific works. Barton, seemingly a changed
character, was at work in the engine room. The negro cook was in the
galley, while in the conning tower the ensign was giving Donald and
Merritt a lesson in handling a diving craft.

In fact, it was Merritt who was at the deflecting apparatus when the
occupants of Tubby's boat saw the submarine sink.

"That is the descending lever and this the ascending one," explained the
officer before Merritt sent the boat under the surface.

The levers were small af