The boys gave a shout of disappointment. Nothing in the way of treasure lay revealed--only a faded velvet cloak edged with tarnished lace.

"Wait a bit," cried Ben tearing off the cloak. "Ah!--"

A different sort of shout came from the boys' throats then. Beneath the cloak lay candle-sticks, gold and silver, great vases, gleaming dull yellow in the mellow light of the gloomy beamed cabin, bowls of the precious metal, splendidly carved, and small parchment bags bulging with the varied shapes of the coins they contained.

The boys dragged the contents of the chest and spread it in a glittering pile.

"So it was no dream of Bluewater Bill's after all," exclaimed Harry.

So excited were they that the boys were anxious to go ahead with the work of breaking open more treasure chests that night; but they yielded to Ben's entreaties and agreed to have supper and a good night's rest before they proceeded to their task. After a meal of bacon, coffee, bread and preserved fruit, cooked on the gasolene stove of the Golden Eagle, the boys professed themselves ready for bed.

"Better sleep aboard the galleon," said Ben.

"Why?" asked Frank.

"Why, we don't want any of those devil-fish coming snooping around in the night, do we?" asked the old sailor, "and they might, if we slept so near the water."

"I should say not," exclaimed Harry, with a shudder at the bare idea.

"Say Frank," exclaimed the younger lad, an hour later, when they were snuggled under blankets--for there is a heavy dew and night chill on the Sarga.s.so--on the deck of the Buena Ventura, "what would you do if the door of the cabin yonder should suddenly open and an old don all in armor should come stalking out and say:

"'Get hence, get hence, young marauders, and leave my treasure untroubled!'"

"I'd offer him a ride in the Golden Eagle to clear the cobwebs out of his brain," said Frank sleepily.

The treasure hunters were astir early the next day and immediately after breakfast--a hearty meal cooked on the Golden Eagle's stove,--had been despatched they were ready for work.

It had been determined to go at the task systematically, so Frank in a notebook, checked off the articles as chest after chest of valuable gold and plate was dragged from the galleon's cabin. He soon had his book full and was compelled to borrow a small pocket diary from his brother.

"I say, Frank!" exclaimed Harry, as he and Ben drew from the moldering chests piece after piece of dull golden ornaments, some of them studded with jewels that blazed as they caught the sun. "What should you say this stuff was worth, as far as we have gone?"

"Every bit of $50,000 I should imagine," replied the elder boy, "although I'm not much of a judge in such matters."

"Hurray, Ben! that will make us all rich," shouted Harry.

"Say," remarked Ben, pausing in his task of emptying a squat chest, marked, Don Ramon De Guzman, Sevilla, "you don't think I'm going to touch any of this loot do you? It all belongs to you boys and Bluewater Bill, and I've no right to a cent's worth of it. The excitement is enough for old Ben Stubbs."

"Well, you've got a nerve!" cried Frank, "to think that you are not going to get a share. Why we are all in on this, and, when we have all the stuff out and get it valued, we'll divide it up in fair proportion."

"You won't get me to take any of it," grumbled old Ben obstinately, grubbing away in the treasure-filled box.

"We shall see about that," said Frank, who knew it was useless to argue with the old sailor.

As they worked feverishly, from time to time gazing at the sky in apprehension of the appearance of Luther Barr's dirigible, the adventurers had an ill.u.s.tration of the manner in which the old Spaniards guarded their treasure that came very near having a tragical termination.

Ben Stubbs had hammered off the lock of a huge chest, with a semi-circular top, and was in the act of flinging back the lid, when he stopped short with an exclamation. It was fortunate for him that he paused, for as he did so, the lid, actuated by some hidden mechanism, swung back and a steel arm, tipped with sharp p.r.o.ngs, shot out. Had the sailor been less nimble the device would undoubtedly have caved his skull in. As it was, it missed him only by an inch.

"Well, that's a nice murderous contrivance," gasped the astonished sailor.

An examination showed the boys that the tips of the p.r.o.ngs were stained and they had little doubt, as they examined it, that the marks were those of human blood. The life fluid of some old-time marauder who had paid with his life for his attempt to rifle the chest. The death-bearing arm, they discovered, was actuated by levers and springs, connecting with the lifting mechanism of the lid. The boys were compelled to admit, as they examined the device, that fiendish as it was it had been designed by a master mechanic of his time.

As they worked, you may imagine, the boys swept the sky for a sign of Luther Barr's dirigible, but not a trace of her did they discover that day.

"It begins to look as if we had beaten Luther Barr this time," cried Harry, exultingly.

"Don't be too sure," was Frank's cautious reply. "He is capable of going to any lengths to satisfy his l.u.s.t for gold, and I am sure he would stop at nothing to get the treasure from us. We may have a lot of trouble on our hands yet."

The treasure as it was catalogued was placed in canvas sacks brought for the purpose, and by supper time that night all the chests had been pretty well emptied and the sacks lay distributed in such a manner as not to interfere with her equilibrium on the Golden Eagle's deck.

"It's going to make a heavy load," said Frank, shaking his head as he looked at the pile.

"We've got to take it all out at once, however," said Ben, "or we would be pretty sure not to find any when we came back."

"It's very certain that Barr cannot be far off," said Harry, gazing about at the opal sunset sky.

"Well, if he comes to-morrow he'll come too late," said Frank, "for we'll be far away from here by then. I intend to sail at dawn."

"That's the idea," was Ben's comment, "no use wasting time on a job of this sort. It's a good thing the weather has kept so clear, otherwise we might have had trouble; aside from old Barr's brand."

"I must confess it was a surprise to me to find that he had not reached here ahead of us," went on Frank; "you know we lost a lot of time in that storm."

"Maybe something went wrong with the dirigible before they started,"

suggested Harry.

"I guess that must be it," said Ben; "otherwise you can bet he'd have gotten on more of a hustle than this."

"Well, I'm just as well content with things as they are," commented Harry, "in fact it would not grieve me much to hear that his old balloon had tumbled into the ocean, crew and all."

Supper was soon despatched that evening, and the boys turned in early.

They slept soundly, but toward midnight Frank had a queer dream. It seemed to him that he was on board the rat ship once more and that scores of the rodents they had battled with were again overwhelming him. He battled bravely with the hosts but they were too many for him.

Just as it seemed that all was over, however, he heard a voice say, "Hold on there!"

So startlingly clear was the voice that Frank awoke as it uttered the words and almost gave a cry, which he instantly checked, as he perceived that it was no dream-voice he had heard.

As he listened intently he heard the voice once more.

"Hold on there--this is it."

The words seemed to come from overhead.

Gazing upward, the boy saw, hovering between the deck of the galleon and the stars, a large black object.

He instantly knew it for what it was.

Luther Barr's air-ship!