“Good heavens!” cried Mr. Griggs, who appeared to be a highly nervous individual, “I’m glad to have my life, Sterrett—glad to have my life. If I don’t catch my death of cold over this I’ll be fortunate indeed.”

“In the meantime,” struck in the man addressed as Sterrett, “we are forgetting in our own troubles the debt of gratitude we owe to our friends here. In the first place, let me introduce ourselves. I am Paul Sterrett, late owner of the Wanderer. This is my friend, Samuel Griggs, and yonder,” indicating the foreign-looking third man, “is Francis Le Blanc, our cook and general handy man. We left New York on a cruise up the coast sometime ago, and up till to-night experienced no mishaps. However, as my friend says, we must not repine; we should consider ourselves fortunate indeed to be onboard your remarkable craft instead of being in a watery grave, as we must have been had it not been for your opportune arrival.”

“We consider ourselves fortunate to have been of service to you,” responded the inventor, and then went on in his turn to introduce himself and his party, and also give a brief explanation of the Sea Eagle, which had, as may be imagined, excited the liveliest curiosity on the part of the rescued castaways.

“But as we shall now get under way without further loss of time,” he concluded, “you will be able to see for yourselves just how the Sea Eagle is controlled, and what she can do.”

As he finished this speech, Dr. Perkins extinguished the searchlight, which had still been playing on the oil-streaked waters which marked the burial spot of the ill-fated Wanderer. This done, he gave Frank the “come ahead” signal. Obediently, as usual, the motor began its song, and the propellers took up the whirring, buzzing refrain. Mr. Sterrett and his companions sat perfectly still in the positions in the stern which had been assigned to them. Had it been light enough to read the expressions on their faces one would have said that they were absolutely dumbfounded.

Of course both Mr. Sterrett and his friends—as well informed men—knew the wonderful capabilities of the modern aëroplane. They had witnessed many flights, and in common with the generality of progressive Americans, knew the general principles of aërial locomotion. But when the Sea Eagle from a “boat” turned suddenly into a hydroplane, they exchanged swift expressions of the utmost astonishment. Only their companion, the paid “hand” from the yacht, sat sullenly unimpressed. In fact, since he had boarded the Sea Eagle, he had not uttered a syllable, only mumbling his thanks when Mr. Sterrett and his companion had finished expressing their gratitude for their rescue.

Under the skillful guidance of Dr. Perkins, and the constant attention that Frank paid to the whirring motor, the Sea Eagle made a quick run back to the island, being guided, when she was still some distance away, by the ruddy glare of a big beacon fire lighted by Ben Stubbs. It was an instance of the veteran adventurer’s thoughtfulness and resource that he had thought of doing this, for in the hurry of the departure, no such instructions had been given him. But on his own responsibility he had kindled the blaze which materially aided the swift return of the Sea Eagle to her eyrie.

Reaching the island, the aërial wonder was sent swinging in decreasing circles, till Dr. Perkins was sure of a safe drop to the workshop on the summit of the little spot of land, and then, with a breath-catching rapidity, the helmsman sent his wonderful vessel earthward, bringing it to a stop within the ruddy glow caused by the blazing bonfire which had guided them.

As the Sea Eagle settled to the earth the party that had been left behind on the adventurous night flight pressed to the side of the novel craft. A glance showed them that the mission of Dr. Perkins’ craft had been crowned with success, and Billy and Pudge began plying the returned voyagers with eager questions. Ben Stubbs was slightly in the background, and it was not till Mr. Sterrett and his companions had stepped out on to the ground that he got a good look at them.

When he did, he gave a deep-drawn gasp of surprise. An expression of supreme amazement overspread his weather-beaten countenance. But his eyes did not fix on Mr. Sterrett or his companion, Griggs. Instead they traveled beyond the nattily clad yachtsmen and rested on the slim figure of the paid “hand.”