lenses and mirrors that reflect into the interior of the submarine
whatever shows above water. The bottle part projects above, while the
tube penetrates the interior.

[Illustration: SPEEDING AT THE RATE OF 102-3/4 MILES AN HOUR]

The very unexpectedness of the submarine's attack, the mere knowledge
that they are in the vicinity of a fleet and may launch their deadly
missiles at any time, is enough to break down the nerves of the
strongest and eventually throw into a panic the bravest crew.

That the crews of the war-ships will have to undergo the strain of
submarine attack in the next naval war is almost sure. All the great
nations of the world have built fleets of submarines or are preparing to
do so.

In the development of under-water fighting-craft France leads, as she
has the largest fleet and was the first to encourage the designing and
building of them. But it was David Bushnell that invented and built the
first practical working submarine boat, and in point of efficiency and
practical working under service conditions in actual readiness for
hostile action the American boats excel to-day.



A PEACEFUL SUBMARINE


Under the green sea, in the total darkness of the great depths and the
yellowish-green of the shallows of the oceans, with the seaweeds waving