"Orderly," ordered Rexdale, beckoning to a marine on duty, "find one of the cabin stewards and send him to the bridge at once."

Hardly a minute elapsed before Oto glided gracefully up the ladder and saluted.

"Take these glasses and see if you can make out that fellow's ensign," said Rexdale.

Oto lifted the binocular to his slanting eyes and picking up the approaching steamer gave it a swift glance. A moment sufficed. Then he returned the glasses to the commander, his face alight.

"Japanese, sir," he said simply. "That the flag of Japanese navy."

Dobson so far forgot his dignity as to slap his thigh.

"That's so!" he exclaimed. "I remember it well enough now. What on earth can a Jap torpedo destroyer want in these waters?"

"We shall soon find out—where's that boy? Gone already? Of course it excites him to see a part of his own navy so near. Stand by for signals, Mr. Dobson. Have your man ready, and get out your book." Dave's eyes were again scrutinising the approaching vessel as he gave the orders.

When the stranger was within about half a mile she rounded to a course parallel with that of the Osprey, showing her long, vicious hull, black and low in the water; and slowed down to keep from running away from the American ship. Presently a line of small flags fluttered up to her masthead.