A mile in the offing, having put about, was the Emden. She had maneuvered even as Lord Hastings had figured, and had run clear by the Sylph in the darkness.

"Full speed ahead!" commanded Lord Hastings.

The Sylph leaped quickly forward, as the bell tinkled the signal to the engine-room, running rapidly to get out of range of the Emden's guns and torpedoes.

Several times, without reducing the speed of his ship, Lord Hastings swerved in his course, and thus spoiled the aim of the German gunners. And then the Emden's sh.e.l.ls began to fall short.

The Sylph was out of range.

For an hour the Emden continued her pursuit, and then once more put about and herself became the pursued, the Sylph following relentlessly on her heels.

It was near noon when the wireless operator aboard the Sylph approached Lord Hastings.

"Have just picked up the Australian cruiser Sydney, sir. I gave him our ident.i.ty and Captain Glossop pays his respects to you, sir."

Lord Hastings jumped to action in a moment.

"Where is he now?"

The operator gave the position of the Sydney.

"A hundred miles away," mused Lord Hastings.

He led the way to the wireless room.

"Send this in code," he told the operator, handing him a slip of paper on which he had written a few words, "and instruct him to reply in code."

The operator did as he was commanded.

The reply was plain to Lord Hastings, himself an operator upon occasion.

"Good!" he said to himself.

He turned to the boys.

"I gave the Sydney our position and told him we were trailing the Emden. He replied that he would head for us immediately; for us to keep up the chase and keep him constantly informed of our position."

"But don't you suppose the Emden has picked up the message, sir."

"Undoubtedly; that is why I sent it in code. Von Mueller may surmise what we are up to, but he cannot be sure."

That the commander of the Emden had picked up the message became apparent a few moments later.

"Emden has signaled the Sydney her presence not needed, sir,"

said the operator, "and signed the message Hastings."

Lord Hastings scribbled rapidly.

"Send this," he ordered.

The message read:

"Disregard all communications not in code. Emden trying to throw you off the track."

The Sydney acknowledged the receipt of this message, and Lord Hastings and the two lads returned to the bridge.

"What do you suppose Captain von Mueller will do now?" asked Jack.

"Run as long as he can," replied Lord Hastings.

"However, the Sydney is considerably faster, so it is only a question of time till we get him."

The Emden now headed east, on a course that eventually would land her, if she maintained it, somewhere along the Malay archipelago.

The Sylph gave chase.

Continual messages were flashed between Lord Hastings and the commander of the Australian cruiser, and it became apparent that the latter gradually overhauling them.

Came a message to Lord Hastings from the commander of the Emden:

"Sorry you were afraid to fight it out."

Lord Hastings wired back:

"I wasn't afraid, but I will take no chance of losing you."

All day and all another night the chase continued; and it was near noon of the following day that the lookout gave the welcome cry:

"Ship off the stern, sir!"

Quickly all eyes were turned in the direction indicated. A smudge of smoke could be seen off the horizon. Came a message from the Sydney:

"Have sighted you."

But the Sydney was still far in the rear when land came in sight.

"What do you make it, sir?" asked Frank of Lord Hastings.

"I should say it is one of the Cocos Islands group," was the reply.

The Emden headed straight for it. Two hours later she landed, and the Sylph stood off.

"Do you suppose Captain von Mueller will desert the ship or sink her?" asked Jack.

"Not without a fight," replied Lord Hastings positively.

It was three hours later before the Emden lifted anchor and put to sea again. Those on board did not know it then, but a landing party from the Emden had destroyed the wireless station on the island while there.

Slowly but surely the Sydney overhauled the Sylph, and at length drew up on even terms with her. Then she forged slowly ahead, drawing closer and closer to her prey.