such indeed, seemed to be the case. the golden-armored giant, after standing for a few moments in an attitude of command, waved his sword three times about his head, and uttered a command, in a voice that sounded like thunder. then the prostrate ones arose, and, making low bows hurried away in all directions.

watching them disappear, the golden one sheathed his weapon and approached the ship. he caught sight of the professor and the two boys in the conning tower, for mark had gone there when he found the ship being transported, and held up his two hands, the palms outward.

“it is the sign of peace in the language all natives employ,” said the professor. “i think i shall trust him.”

followed by the boys he descended from the little platform in the tower, and to the door that opened on the deck.

“shall we go out?” he asked.

“we can’t be much worse off,” replied mark. “let’s chance it.”

so, not without many misgivings, they slid back the portal and stepped out to face the strange and terrible being who had so suddenly come to their rescue.

the giant in the golden armor did not seem surprised to see them. in fact he acted as though he rather expected them. he continued to hold up one hand, with the palm, outward, while, with the other, he removed his helmet and bowed low. then he cast his sword on the ground and advanced toward the ship. when within ten feet he sat down on the ground, and this brought his head nearer the earth, so that his auditors could both see and hear him to better advantage.

as soon as the giant saw the travelers were outside their ship he began to speak to them in a voice, which, though he might have meant it to be low and gentle, was like the bellowing of a bull. at the same time he made many gestures, pointing to the ship, to himself and to mark.

“what is he saying, professor?” asked jack.

“i can’t understand all he says,” mr. henderson replied. “he uses some words derived from the latin and some from the greek. but by piecing it out here and there, and by interpreting his motions i am able to get at something.”

“and what is it all about?”

“it is a strange story,” the scientist replied. “he has only gone about half way through it. wait until he finishes and i will tell you.”

the golden-armored giant, who had stopped in his narrative while jack was speaking, resumed. his gestures became more rapid, and his words came faster. several times mr. henderson held up his hand for him to cease, while he puzzled out what was meant.

at one point, the professor seemed much startled, and motioned for the strange being to repeat the last part of his discourse. when this had been done mr. henderson shook his head as though in doubt.

at length the story was finished, and the lone giant, for there were no others in sight now, folded his arms and seemed to await what the professor’s answer might be. mr. henderson turned to the boys, and to the others of the mermaid’s company, who, by this time, had joined him, and said:

“friends, i have just listened to a strange story. it is so strange that, but for the fact that our own adventures are verging on the marvelous, i could hardly believe it. in the first place, this man here is the king of this country. that is why all the other natives obeyed him.

“in the second place it seems he has been a passenger in our boat, and came here from the earth’s surface with us!”

“what’s that?” cried jack.

“that explains the strange happenings!” ejaculated mark. “no wonder i could never solve the secret of the storeroom.”

“you are right, it does,” replied mr. henderson. “i will not go into all the details of how it happened, but it seems the big hole through which we came is only one of two entrances to this inner world. rather it is the entrance, and there is another, close to it, which is the exit. through the latter a big stream of water spouts up, just as one pours down through the opening we used.

“hankos, which is the name of the king, was for many years a student of science. he longed to see where the big stream of upward spurting water went, and wanted to know whence came the down-pouring one. so he undertook a daring experiment.

“he constructed a great cylinder, and, keeping his plans a secret, conveyed it to the spouting water, entered it, and, by means of pulleys and levers, after he had shut himself inside, cast himself into the up-shooting column. he took along compressed air cylinders to supply an atmosphere he could breathe, and some food to eat, for it appears our giant friends are something of inventors in their way. the current of water bore him to the surface of the earth, and he was cast up on the ocean, in what was probably taken for a waterspout if any one saw it.

“then a strange thing happened. no sooner did hankos open his cylinder, which served him as a boat, than he lost his gigantic size, owing to the difference of the two atmospheres. he became almost of the same size as ourselves, except that his skin hung in great folds on him, and he seemed like a wrinkled old man. his clothes too, were a world too large.

“he had a terrible time before he reached shore, and a hard one after it, for his strange appearance turned almost every one against him. he was sorry he had ventured to solve the mystery of the up-shooting stream of water, for he was worse than an outcast.

“then he began to plan to get back to his own inner world. but he could not find the downward stream, and, not knowing the language of the countries where he landed, he had no means of ascertaining. he traveled from place to place, always seeking for something that would lead him back to his own country.

“finally he heard of us, and of our ship, though how i do not know, as i thought i had kept it a great secret. by almost superhuman struggles he made his way to our island. he says he concealed himself aboard the mermaid the night before we sailed, but i hardly believe it possible. it seems——”

“he did it, for i saw him!” interrupted mark.

“you saw him!” cried mr. henderson.

then mark told of the many things that had puzzled him so, how he had seen the queer figure slinking aboard the boat, of the disappearance of food from time to time, and of the strange noises in the storeroom.

“that bears out what he told me,” the professor said. “hankos says he used to steal out nights and take what food he could get, and he also mentions some one, answering to mark’s description, who nearly discovered him once as he hurried back into the apartment.

“however, it seems to be true, since mark confirms it. at any rate hankos stayed in hiding, and made the entire trip with us, and, just as we all became overcome with the strange gas he escaped, having begun to expand to his original giant size, and being unable to remain any longer in his cramped quarters.”

“that’s so, he did!” cried mark. “i saw him come out of the place just before i lost my senses. it was a terrible sight, and none of you would believe me when i told you some of the occurrences afterward.”

“you must forgive us for that,” the professor said. “we have learned much since then.”

“what did hankos do after he left the ship when it landed in this country?” asked jack.

“he traveled until he came to this village, which is the chief one of this country,” replied the professor. “part of the time he followed us at a distance, being able to travel very fast.”

mark remembered the strange figure of a giant he had seen on the hill tops several times, and knew that he had been observing the being who had played such a queer part in their lives.

“when he came back among his own people,” went on mr. henderson, “they would not receive him at first, believing him to be an impostor. but hankos convinced them of his identity and was allowed to don the golden armor, which is the badge of kingship. he had only been in office for a little while when he heard of the arrival of the strange thing, which turned out to be our ship. he recognized it from the description, and, learning that we were likely to be sacrificed to the fury and ignorance of the giants, he hurried here and saved our lives.

“he says he can never thank us enough for being the means whereby he was able to get back to his own country, and says the freedom of this whole inner world is ours. he has given orders that we are to go wherever we like, and none will molest us. he tells me the land is a wonderful one, compared to our own, and urges us to make a long journey. he would like to go with us, only, now that he has resumed his natural size, he can not get inside the ship.”

“hurrah for king hankos!” cried jack and the others joined him in a hearty cheer.

the giant in the golden armor evidently understood the compliment which was paid him, for he waved his helmet in the air and responded with a shout of welcome that made the ground tremble.

hankos waited until the professor had translated all of the story to the other travelers. then the genial giant began to talk some more, and the professor listened intently.

“he says,” spoke mr. henderson to his friends, “that we will be supplied with all the fruit we want, and with the best of the houses to sleep in on our journey. he also tells me he has great stores of shining stones and piles of the metal of which his armor is made, and that we are welcome to as much as we want. if this means unlimited gold and diamonds, we may make our fortunes.”

“jest let me git ma’ hand on a few sparklers an’ i’ll quit work!” exclaimed washington.

“i have told him,” the scientist went on, “that we will take advantage of his kind offer. we will start on our trip in a day or so, after we have looked over the ship to see if it is not damaged. he tells me the gold and sparkling stones are several thousand miles away, on top of a high mountain. we will make that our objective point.”

the interview between the king and mr. henderson having ended, the former waved his sword in the air and the swarm of big men came back. they had been hiding back in the woods. now their manner was very different. they carefully, removed the rollers and ropes, and soon there was brought to the adventurers an immense pile of fine fruits. if our friends had stayed there a year they could not have eaten it all. the giants were judging the appetites of the travelers by their own.

that night the adventurers slept more soundly than they had since entering the strange world. they felt they had nothing to fear from the giants. in the morning they were not molested, though big crowds gathered to look at the ship. but they kept back a good distance. the machinery was found to be in good shape, save for a few repairs, and when these were made, the professor announced he would start on a long journey.

for several weeks after that the travelers swung about in their ship, sometimes sailing in the air and again on big seas and lakes viewing the wonders of the inner world. they were many and varied, and the professor collected enough material for a score of books which he said he would write when he got back to the outer world once more.

one afternoon, as they were sailing over a vast stretch of woodland, which did not seem to be inhabited, mr. henderson, looking at one of the gages on the wall, asked:

“boys do you know how far you have traveled underground?”

“how far?” asked jack, who hated to guess riddles.

“more than four thousand miles,” was the answer.

“but we haven’t come to that mountain of gold and diamonds,” said mark. “i am anxious to see that.”

“have patience,” replied the professor. “i have not steered toward it yet. there are other things to see.”

just then washington’s voice could be heard calling from the conning tower:

“we’re coming to a big mountain!”