Mr. Barton Swift had stood the easy journey in the private car very well. Before he would sign the contract that Mr. Bartholomew offered, he wished to see for himself just how good his son"s invention was.

They made another test from Hendrickton to Panboro, over the "official route," as Ned called it. The time made by Hercules 0001 was even a little better than before.

That the invention was well nigh perfect, and that it could do even more than Mr. Bartholomew had hoped or Tom had claimed, was Mr. Swift"s conviction.

"Tom," he said to his son, "you have done a wonderful thing. Not only have you completed a marvelous invention and gained thereby a lot of money, and more in prospect, but you have aided in the world"s progress to no small degree.

"Speed in transportation is the big problem before the world of commerce today. To move goods from point to point safely and cheaply, as well as rapidly, is the great task of this age. We are entering the Age of Speed. The railroads must solve the problem to compete with motor-truck traffic and fast boats on the lakes and rivers of our land.

"You have, by your invention, shoved the clock of progress forward. I am proud of you, my boy. I know now that, no matter what may happen to me, you will make an enviable mark in the world of invention.

"You have done much before for the Government in time of stress. But war engines of any kind are not worthy examples of inventive genius beside such a thing as this.

"It is the inventions of peace, rather than those of war, that stand for human progress."

Coming back over the mountain, Mary Nestor rode in the cab with Tom.

She sat on the swivel stool, in fact, and handled the controls for part of the way. But she gave up the driver"s place to Tom before they reached the timber siding east of Cliff City.

"I cannot go by that place without a shudder," Mary said to the inventor. "Ned and Mr. Damon told me all about that accident. Suppose you had been killed, Tom!"

"I see I"ll have to build an invention that will make that impossible,"

chuckled the young fellow.

"Make what impossible?"

"Some invention that will make it positively certain that no matter what I do or where I go, nothing can harm me. Nothing else will suit you, Mary, I plainly see."

"Well," returned the girl, smiling fondly at him. "I admit that would satisfy me completely!"

This Isn"t ALL!

Would you like to know what became of the good friends you have made in this book?

Would you like to read other stories continuing their adventures and experiences, or other books quite as entertaining by the same author?

On the reverse side of the wrapper which comes with this book, you will find a wonderful list of stories which you can buy at the same store where you got this book.

Don"t throw away the Wrapper

Use it as a handy catalog of the books you want some day to have. But in case you do mislay it, write to the Publishers for a complete catalog.

THE TOM SWIFT SERIES

By VICTOR APPLETON

Uniform Style of Binding. Individual Colored Wrappers.

Every Volume Complete in Itself.

Every boy possesses some form of inventive genius. Tom Swift is a bright, ingenious boy and his inventions and adventures make the most interesting kind of reading.

TOM SWIFT AND HIS MOTOR CYCLE TOM SWIFT AND HIS MOTOR BOAT TOM SWIFT AND HIS AIRSHIP TOM SWIFT AND HIS SUBMARINE BOAT TOM SWIFT AND HIS ELECTRIC RUNABOUT TOM SWIFT AND HIS WIRELESS MESSAGE TOM SWIFT AMONG THE DIAMOND MAKERS TOM SWIFT IN THE CAVES OF ICE TOM SWIFT AND HIS SKY RACER TOM SWIFT AND HIS ELECTRIC RIFLE TOM SWIFT IN THE CITY OF GOLD TOM SWIFT AND HIS AIR GLIDER TOM SWIFT IN CAPTIVITY TOM SWIFT AND HIS WIZARD CAMERA TOM SWIFT AND HIS GREAT SEARCHLIGHT TOM SWIFT AND HIS GIANT CANNON TOM SWIFT AND HIS PHOTO TELEPHONE TOM SWIFT AND HIS AERIAL WARSHIP TOM SWIFT AND HIS BIG TUNNEL TOM SWIFT IN THE LAND OF WONDERS TOM SWIFT AND HIS WAR TANK TOM SWIFT AND HIS AIR SCOUT TOM SWIFT AND HIS UNDERSEA SEARCH TOM SWIFT AMONG THE FIRE FIGHTERS TOM SWIFT AND HIS ELECTRIC LOCOMOTIVE TOM SWIFT AND HIS FLYING BOAT TOM SWIFT AND HIS GREAT OIL GUSHER TOM SWIFT AND HIS CHEST OF SECRETS TOM SWIFT AND HIS AIRLINE EXPRESS

THE DON St.u.r.dY SERIES

By VICTOR APPLETON

Individual Colored Wrappers and Text ill.u.s.trations by WALTER S. ROGERS

Every Volume Complete in Itself

In company with his uncles, one a mighty hunter and the other a noted scientist, Don St.u.r.dy travels far and wide, gaining much useful knowledge and meeting many thrilling adventures.

DON St.u.r.dY ON THE DESERT OF MYSTERY; Or, Autoing in the Land of the Caravans.

An engrossing tale of the Sahara Desert, of encounters with wild animals and crafty Arabs.

DON St.u.r.dY WITH THE BIG SNAKE HUNTERS; Or, Lost in the Jungles of the Amazon.

Don"s uncle, the hunter, took an order for some of the biggest snakes to be found in South America--to be delivered alive! The filling of that order brought keen excitement to the boy.

DON St.u.r.dY IN THE TOMBS OF GOLD; Or, The Old Egyptian"s Great Secret.

A fascinating tale of exploration and adventure in the Valley of Kings in Egypt. Once the whole party became lost in the maze of cavelike tombs far underground.

DON St.u.r.dY ACROSS THE NORTH POLE; Or, Cast Away in the Land of Ice.

Don and his uncles joined an expedition bound by air across the north pole. A great polar blizzard nearly wrecks the airship.

DON St.u.r.dY IN THE LAND OF VOLCANOES; Or, The Trail of the Ten Thousand Smokes.

An absorbing tale of adventures among the volcanoes of Alaska in a territory but recently explored. A story that will make Don dearer to his readers than ever.

THE RADIO BOYS SERIES (Trademark Registered)

By ALLEN CHAPMAN

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