As thought, a belief, an experiment; discouragement, hope, effort and final success--this is the history of many an invention; a history in which excitement, competition, danger, despair and persistence figure. This merely suggests the circumstances which draw the daring Boy Inventors into strange experiences and startling adventures and which demonstrate the practical use of their vanishing gun. THE BOY INVENTORS' DIVING TORPEDO BOAT. As in the previous stories of the Boy Inventors, new and interesting triumphs of mechanism are produced which become immediately valuable, and the stage for their proving and testing is again the water. On the surface and below it, the boys have jolly, contagious fun, and the story of their serious, purposeful inventions challenge the reader's deepest attention. Any volume sent postpaid upon receipt of price. HURST & COMPANY--PUBLISHERS--NEW YORK BORDER BOYS SERIES Mexican and Canadian Frontier Series By FREMONT B. DEERING. Cloth Bound. Illustrated. Price, 50¢. per vol., postpaid [Illustration: Book Cover] THE BORDER BOYS ON THE TRAIL. What it meant to make an enemy of Black Ramon De Barios--that is the problem that Jack Merrill and his friends, including Coyote Pete, face in this exciting tale. THE BORDER BOYS ACROSS THE FRONTIER. Read of the Haunted Mesa and its mysteries, of the Subterranean River and its strange uses, of the value of gasolene and steam "in running the gauntlet," and you will feel that not even the ancient splendors of the Old World can furnish a better setting for romantic action than the Border of the New. THE BORDER BOYS WITH THE MEXICAN RANGERS. As every day is making history--faster, it is said, than ever before--so books that keep pace with the changes are full of rapid action and accurate facts. This book deals with lively times on the Mexican border. THE BORDER BOYS WITH THE TEXAS RANGERS. The Border Boys have already had much excitement and adventure in their lives, but all this has served to prepare them for the experiences related in this volume. They are stronger, braver and more resourceful than ever, and the exigencies of their life in connection with the Texas Rangers demand all their trained ability. Any volume sent postpaid upon receipt of price. HURST & COMPANY--PUBLISHERS--NEW YORK BUNGALOW BOYS SERIES LIVE STORIES OF OUTDOOR LIFE By DEXTER J. FORRESTER. Cloth Bound. Illustrated. Price, 50¢. per vol., postpaid [Illustration: Book Cover] THE BUNGALOW BOYS. How the Bungalow Boys received their title and how they retained the right to it in spite of much opposition makes a lively narrative for lively boys. THE BUNGALOW BOYS MAROONED IN THE TROPICS.