shape for a trip to the Arctic regions."

Tom's attention for the moment was taken off his little monoplane, and his memory went back to the strange scenes in which he and his friends had recently played a part, in searching for the cave of the diamond-makers on Phantom Mountain. He recalled the promise he had made to the old miner.

"I wonder if he expects us to start for Alaska with winter coming on?" thought Tom.

His musings were suddenly interrupted by the entrance into the yard, surrounding the aeroplane shed, of a lad about his own age.

"Hello, Ned Newton!" called Tom, heartily.

"Hello, yourself," responded Ned. "I've got a day off from the bank, and I thought I'd come over and see you. Say, have you heard the latest?"

"No. What is it?"

"Andy Foger is building an airship."

"Andy Foger building an airship?"

"Yes, he says it will beat yours."

"Humph! It will, eh? Well, Andy can do as he pleases as long as he doesn't bother me. I won't be around here much longer, anyhow."

"Why not, Tom?"

"Because I soon expect to start for the far north on a strange quest. Come on in the shed, and I'll tell you about it. We're going to try to locate a valley of gold, and I guess Andy Foger won't follow me there, even if he does build an airship."

Tom and his chum started toward the shed, the young inventor still holding the letter that was to play such an important part in his life within the next few months. And, had he only known it, the building of Andy Foger's airship was destined to be fraught with much danger to our hero.

CHAPTER II

ANDY FOGER'S TRIPLANE

"Going to look for a valley of gold, eh?" remarked Ned Newton as he and Tom took seats in a little room, fitted up like a den, where the young inventor frequently worked out the details of the problems that confronted him. "Where is this valley, Tom? Anywhere so I could have a chance at it?"

"It's up in Alaska. Just where I don't know, but Abe Abercrombie, the old miner whom we met when out in Colorado this summer, says he can find it if we circle around in the airship. So I'm going to take a chance. I'll tell you all about it."

And, while Tom is doing this, I will take the opportunity to more formally introduce to my new readers our hero and his friends.

Tom Swift was an inventor of no little note, in spite of his youth. He lived with his father, Barton Swift, who was also an inventor, on the outskirts of the village of Shopton, New York State. Tom's mother was dead, and Mrs. Baggert had kept house for him and his father since he was a child. Garret Jackson, an expert machinist, was also a member of the household, and as has been explained, Eradicate Sampson, who took that name because, as he said he "eradicate de dirt," was also a sort of retainer. He lived in a little house on the Swift grounds, and did odd jobs about the place.

In the first book of the series, entitled "Tom Swift and His Motor Cycle," there was related how the lad became possessed of one of those speedy machines, after Mr. Wakefield Damon had come to grief on it. Mr. Damon was an eccentric man, who was always blessing himself, some part of his anatomy, or some of his possessions.

After many adventures on his motor-cycle, Tom Swift went through some surprising happenings with a motor-boat he bought. After that he built an airship, the RED CLOUD, and later he and his father constructed a submarine, in which they went under the ocean in search of sunken treasure, enduring many perils and much danger.

Tom Swift's electric runabout, which he built after returning home from the submarine trip, proved to be the speediest car on the road. The experience he acquired in making this machine stood him in good stead, when (as told in the sixth volume, "Tom Swift and His Wireless Message") the airship in which he, Mr. Damon and a friend of the latter's (who had built the craft) were wrecked on Earthquake Island. There Tom was marooned with some refugees from a wrecked steam yacht, among whom were Mr. and Mrs. Nestor, father of a girl of whom Tom thought a great deal.

With parts from the wrecked electric airship the youth rigged up a plant, and sent wireless messages from the island. The castaways nearly lost their lives in the earthquake shocks, but a steamer, summoned by Tom's wireless call, arrived in time to save them, just as the island disappeared beneath the sea.

In the seventh book of the series, entitled "Tom Swift Among the Diamond Makers" there was related the adventures of himself and his friends when they tried to solve the mystery of Phantom Mountain.

Among the castaways of Earthquake Island was a Mr. Barcoe Jenks and a Professor Ralph Parker. Mr. Jenks was a strange man, and claimed to have some valuable diamonds, which he said were made by a gang of men hidden in a cave in the Rocky Mountains. Tom did not believe that the diamonds were real, but Mr. Jenks soon proved that they were.

He asked Tom to aid him in searching for the cave of the diamond makers. Mr. Jenks had been there once—in fact, he had been offered a partnership in the diamond-making business, but, after he had paid his money, he had been drugged, and carried secretly from the cave before he had a chance to note its location.

But he, together with Tom, Mr. Damon and the scientist Mr. Parker, who correctly predicted the destruction of Earthquake Island, set out in the RED CLOUD to find the diamond makers. They did find them, after many hardships, and were captured by the gang. How Tom and his friends escaped from the cave, after they had seen diamonds made by a powerful lightning flash, and how they nearly lost their lives from the destruction of Phantom Mountain, is fully set down in the book.

Sufficient to say now, that, though they had a general idea of how the precious stones were made, by the power of the lightning, the young inventor and his friends were never quite able to accomplish it, and the secret remained a secret. But they had secured some diamonds as they rushed from the cave (Mr. Damon grabbing them up) and these were divided among Tom and the others.

Just as they were ready to come home in the airship, our friends were met by an old miner, Abe Abercrombie, who spoke of a valley of gold in Alaska, which was the story Tom related to Ned Newton, as the two chums sat in the den of the airship shed.

"Then you don't know all the details about the gold valley, Tom?" remarked Ned, as the young inventor showed his chum the letter that had just arrived.

"No, not all of them. At the time this miner met us I was anxious to get back East, for we had been away so long I knew dad would be worried. But I listened to part of Abe's story, and half promised to go in partnership in this quest for gold. He was to furnish information about the hidden valley, and I was to supply the airship. I expect Abe to come along at any time, now, and then I'll hear more particulars."

"Will you go all the way in the airship?"

"Well, I hadn't thought of that. I could ship it to the nearest place by rail, I suppose, and go on from there. That's a detail to be considered later. I'll talk it over with Abe."

"Who are going?"

"I don't know that even. I suppose Mr. Damon would feel slighted if I left him out. And perhaps Mr. Parker, that gloomy scientist, who is always predicting terrible accidents, will be glad to go along. Then Abe may have some friend he wants to take."

"By Jinks! But you certainly do have swell times, Tom Swift!" exclaimed Ned Newton, enviously. "I wish I could go and have a try at that valley of gold!"

"Why don't you come along, Ned?"

"Do you really mean it?"

"Of course."

"But I don't believe I could get away from the bank."

"Oh, dad and Mr. Damon could fix that. They're directors, you know. Come along, I'd be delighted to have you. Will you?"

"I'll think about it. Jinks! But I sure would like to