concussion is much more terrible than is caused by our most powerful
explosives. Because no ship could hold together under such destructive
shells, the nations abandoned their navies and devoted their energy to
devising a safe camp for soldiers and to building these air-vessels with
additional improvements.

It was found that the only way to protect a camp was to cover it with a
water proof shed, so constructed that nine or ten inches of water would
remain on the roof. Then a wide shallow trench was dug around the shed
and kept filled with water. These shells will not explode if they fall
in that depth of water, but will explode in water of greater depth. You
can see at a glance how difficult it is to manage an army under these
circumstances. The only redeeming feature is that the enemy also is
compelled to resort to the same protection. An international law
forbids the destruction of homes in times of war.

[Illustration: The Battle of the "Flying Devils."]

Wars are of short duration. Usually the decisive conflict is fought in
the air, and is the most terrible of them all. Imagine two of these
Flying Devils approaching one another far above the surface of Zik. Each
vessel is set in action long before it is in range of the other in the
hope of firing the first effective shot. Each party of the conflict
knows that the air vessel first struck will be at an end forever, for it
will be blown to pieces and every life on board will be shattered into
shapeless masses, while the wreckage falls amidst the burning of the
combustibles. What a horrible ending of a short battle!

The wisest of the Zikites have proposed many plans to settle
international differences but, like us, they have failed to suggest any