Quietly they walked over to Dillon, searched him, and found three more coins of the same kind.

“Reckon that was the motive, sir,” said Manly. “They found these while they were exploring the island, and Dillon, thinking he had come across treasure-trove, decided to kill us both off. Harper went first, and my turn would have come very soon. Thank God I went in search of Harper!”

The officer agreed with Manly in his suggestion, and soon had his men searching the beach; but not another coin was discovered. Instead, they found the skeleton of a man—of some poor mariner, no doubt, who had been cast ashore, his worldly possessions consisting of the five gold coins that had roused the cupidity of Dillon, and had brought tragedy upon them.

Presently Manly was taken on board the Bristol, and sailed away from the coral island, the scene of a tragedy of treasure that never existed.

Everyone has heard of the treasure of Cocos Islands, off Panama, to which many expeditions have been sent, though without success. The treasure was hidden by a pirate named Beneto Bonito, and hidden so securely that, although many expeditions—some of them recent ones—have been sent out to find it, none has yet succeeded. But, despite failure, year after year men go forth, secretly and well equipped, seeking the hoards of riches that they fondly believe they will some day find.

Perhaps they will.

ADVENTURES UNDER SEA

Strange Happenings to Submarines and Divers

MAN, not content with fighting Father Neptune for mastery on the seas, has gone farther than that, and has sought to show that he is not afraid of any terrors beneath the seas: he would be master over all. So men have become divers; so ships which can sink and rise again have been made. And the diver and the submarine boat have added to the tale of man’s conquest over Nature; their chapter is as full of vigour and vim and adventure as any chapter in the tale.

We are not concerned with the make-up of the submarine, but with the adventures of the brave and hardy sailors who man them, and the part the boats play in great naval wars. The latter may be dismissed by saying that the submarine’s work is to dash forth from the security of harbours, and make sudden attacks upon the bigger craft of the enemy in the hope of reducing their number. These were the tactics employed by Germany in the great war of 1914-15. Aware that Britain’s navy was vastly superior to her own, and that the only hope for success in a great encounter would be when the British navy had been reduced, Germany kept her Dreadnoughts and other big craft safe in her harbours, contenting herself with sending out submarines to strike sudden blows at the British patrolling vessels guarding the seas. Britain employed her submarines for the purpose of luring the Germans from their harbours (as the account, given in another chapter, of the Battle of the Bight of Heligoland shows).