Suddenly there came a hail from Ben, who was standing at the bow of the craft.

"Land ho!"

The adventurers crowded forward.

There, sure enough, dead ahead of them, was what looked like a tiny blue cloud on the horizon, but which Ben's practiced eye had told him was land. With new heart the voyagers drove on and by mid-afternoon were in sight of the island, which on closer view proved to be one of those small palm-crowned atolls that are common enough in these waters.

The dirigible had by this time settled so badly that she was barely twenty feet above the wave-tops.

Some sacks of ballast still remained, kept by Frank for an emergency. He now was compelled reluctantly to give the order to cut these away and one by one they dropped overboard; but as they did so, the ship rose and an hour later they landed on a smooth beach.

The island did not seem to be of great extent, but to the delight of the adventurers, from the midst of the cocoanut grove that crowned the islet there flowed a tiny stream of clear water. This was indeed a godsend, as they did not know how long they might have to remain there. With a spade, which formed part of the dirigible's outfit—"I suppose they figured on shoveling out the treasure," laughed Harry—a small basin was soon dug out for the water to settle in and make a sort of small well, from which it could be dipped out for cooking and drinking purposes.

Fortunately the larder of the dirigible was well stocked, and as they were two mouths short they were not in any immediate fear of hunger. That evening, when arrangements for sleeping and keeping watch for any passing steamer or vessel had been made, Constantio beckoned to Frank and asked him to join him in a walk along the beach. The lad, nothing loath of a chance for exploration, started off with the Spanish inventor, who seemed to be anxious to confide something to him.

"You are worried about getting away from the island?" he said.

"I am—yes," rejoined Frank, "you see our gas is exhausted and I for one can't figure out but we shall stay here till some one comes along and picks us up. Unless we can build a raft out of the remains of the dirigible."