The automobile industry was fast forging to the front when Tom came back from his trip under water, and naturally he turned his attention to that. But he made an electric car instead of one that was operated by gasolene, and it proved to be the speediest car on the road.

The details of Tom Swift and his wireless message will be found in the book of that title. It tells how he saved the castaways of Earthquake Island, and among them was Mr. Nestor, the father of Mary, a girl whom Tom thought--but there, I'm not going to be mean, and tell on a good fellow. You can guess what I'm hinting at, I think.

It was when Tom went to get Mary Nestor a diamond ring that he fell in with Mr. Barcoe Jenks, who eventually took Tom off on a search for the diamond makers, and he and Tom, with some friends, discovered the secret of Phantom Mountain.

One would have thought that these adventures would have been enough for Tom Swift, but, like Alexander, he sighed for new worlds to conquer. How he went to the caves of ice in search of treasure, and how his airship was wrecked is told in the eighth volume of the series, and in the next is related the details of his swift sky-racer, in which he and Mr. Damon made a wonderfully fast trip, and brought a doctor to Mr. Swift in time to save the life of the aged inventor.

It was when Tom invented a wonderful electric rifle, and went to Africa with a Mr. Durban, a great hunter, to get elephants' tusks, that he rescued Mr. and Mrs. Illingway, the missionaries, who were held captive by red pygmies.

That was a startling trip, and full of surprises. Tom took with him to the dark continent a new airship, the Black Hawk, and but for this he and his friends never would have escaped from the savages and the wild beasts.

As it was, they had a hazardous time getting the missionary and his wife away from the jungle. It was this same missionary who, as told in the first chapter of this book, sent Tom the letter about the city of gold. Mr. Illingway and his wife wanted to stay in Africa in an endeavor to christianize the natives, even after their terrible experience. So Tom landed them at a white settlement. It was from there that the letter came.

But the missionaries were not the only ones whom Tom saved from the red pygmies. Andy Foger, a Shopton youth, was Tom's enemy, and he had interfered with our hero's plans in his trips. He even had an airship made, and followed Tom to Africa. There Andy Foger and his companion, a German were captured by the savages. But though Tom saved his life, Andy did not seem to give over annoying the young inventor. Andy was born mean, and, as Eradicate Sampson used to say, "dat meanness neber will done git whitewashed outer him--dat's a fack!"

But if Andy Foger was mean to Tom, there was another Shopton lad who was just the reverse. This was Ned Newton, who was Tom's particular chum, Ned had gone with our hero on many trips, including the one to Africa after elephants. Mr. Damon also accompanied Tom many times, and occasionally Eradicate went along on the shorter voyages. But Eradicate was getting old, like Mr. Swift, who, of late years, had not traveled much with his son.

When I add that Tom still continued to invent things, that he was always looking for new adventures, that he still cared very much for Mary Nestor, and thought his father the best in the world, and liked Mr. Damon and Ned Newton above all his other acquaintances, except perhaps Mrs. Baggert, the housekeeper, I think perhaps I have said enough about him; and now I will get back to the story.