After the conclusion of the meal all hands adjourned to the wharf, and a thorough examination was made once more of the Sea Eagle, with the object of detecting any damage which the Daniels and Duval might have done her, and which might have been overlooked in the lamplight investigation made by Dr. Perkins and Harry. A bright spot was found on one of the metal braces. Undeniably it had been done by the teeth of a file, but it was only a superficial damage, which did not affect the strength of the Sea Eagle in any way.

“I guess Frank scared them away before they had time to do any more harm,” was Dr. Perkins’ conclusion; but later on he was to have a different opinion.

As things were at present, however, Dr. Perkins felt no hesitation in declaring the Sea Eagle fit to resume her voyage without further delay. The fresh provisions being on board, and there being nothing to prevent an immediate start, the voyagers at once made ready for a continuance of the trip which, so far, had proved so packed with adventure.

The gasolene tank was refilled, and the emergency receptacles for the liquid fuel seen to. Plumbo Boggs was paid and instructions left to telegraph Dr. Perkins in New Orleans in case any trace was found of the miscreants, who undoubtedly had intended to injure the Sea Eagle, and who had played such a dastardly trick on Frank.

“You’ll fly from the sea far up to the sky; good-by! good-by! good-by! good-by!” cried Plumbo Boggs as the ropes that held the Sea Eagle to the wharf were cast off and, amidst a loud cheer from the crowd, the engine was started.

It was a fine summer morning with a glassy sea and a sky that was cloudless, except in the east, where a great mass of castellated white clouds were piled up.

“You’d best hug the shore,” were Captain Carney’s parting words of advice. “To my mind we’ll have a storm of some sort before the day’s out.”

But in the noise and excitement of the departure his words were unheard and the Sea Eagle started off down the coast with the warning unheeded. Dr. Perkins ran the craft over the water till the mouth of the harbor was reached, easily outdistancing some fast launches that tried to keep up with them. When they got “outside,” the Sea Eagle was driven ahead at top speed, and with her rising planes set at a sharp angle she was driven upward till a height of some five hundred and fifty feet had been obtained. Her course was due south.

They were flying over a small island not far from the shore when Frank, who was looking over the side, noticed a dory ashore on the beach. He had hardly noticed this before three figures came running down to the beach and pointed upward. One of them jerked a rifle up to his shoulder, and a minute later a puff of smoke came from the barrel. Simultaneously a bullet sang through the rigging of the Sea Eagle, boring a small hole in one of the upper planes, but, fortunately, not striking any vital part of the craft or doing injury to her passengers.

“That’s those rascals now!” exclaimed Frank indignantly. “They must have rowed down to that island and are waiting there for a chance to get ashore quietly. Shall we go down and attack them?”