_It is an introduction to electricity, written simply to show boys how the wonderful force may be looked upon as a friend, and even a playmate._ _HARPER’S GASOLINE ENGINE BOOK_ By ALPHEUS HYATT VERRILL _A simple and practical guide for all those who own, use, or operate gas and gasoline motors. While intended for boys, it will prove of equal value to older readers._ _HARPER’S AIRCRAFT BOOK_ By ALPHEUS HYATT VERRILL _The six divisions of the book are: Why the Aeroplane Flies, Model Aeroplanes, Gliders or Non-propelled Aeroplanes, Various Types of Aeroplanes. Hydro-aeroplanes, and Uses of the Aeroplane._ Each Volume Fully Illustrated. Crown 8vo HARPER & BROTHERS NEW YORK ESTABLISHED 1817 LONDON HARPER’S CAMP LIFE SERIES _CAMPING ON THE GREAT RIVER_ BY RAYMOND S. SPEARS _A farmer’s son ventures out into the great world to make a man of himself and succeeds. He embarks in a shanty-boat and sails down the Ohio and Mississippi, where he has all kinds of adventures which will make the boy-reader long to imitate him._ _CAMPING ON THE GREAT LAKES_ BY RAYMOND S. SPEARS _A story of self-reliance and independence as well as adventure. Will Sayne and Miles Breton take a voyage of discovery from Ontario and Erie, through Huron to the vast stretch of Lake Superior. They become involved innocently in smugglers’ plots._ _CAMPING IN THE WINTER WOODS_ BY ELMER RUSSELL GREGOR _The story of two boys who are granted the privilege of a winter of hunting and trapping in the Maine woods under the tuition of their father’s famous guide, Old Ben. It is not only a fine story but is filled with the information about wild animals and woodcraft that boys love._ _CAMPING ON WESTERN TRAILS_ BY ELMER RUSSELL GREGOR _The same two boys spend a summer in the Rocky Mountains, shoot mountain-lions and wolves, secure photographs of mountain-sheep and bears, pan gold in cañon streams, and are nearly suffocated in a forest fire._ _Illustrated. Post 8vo_ HARPER & BROTHERS NEW YORK ESTABLISHED 1817 LONDON HARPER’S PRACTICAL BOOKS _HARPER’S BOOK FOR YOUNG GARDENERS_ _HARPER’S INDOOR BOOKS FOR BOYS_ _HARPER’S OUTDOOR BOOK FOR BOYS_ _HARPER’S CAMPING AND SCOUTING_ _HARPER’S BOATING BOOK FOR BOYS_ _HARPER’S ELECTRICITY BOOK FOR BOYS_ _HARPER’S BOOK FOR YOUNG NATURALISTS_ _HARPER’S HOW TO UNDERSTAND ELECTRICAL WORK_ _HARPER’S MACHINERY BOOK FOR BOYS_ _HARPER’S HANDY-BOOK FOR GIRLS_ _THE STORY OF OUR GREAT INVENTIONS_ _MOTOR-BOATING FOR BOYS_ Each Volume Fully Illustrated. Crown 8vo HARPER & BROTHERS NEW YORK ESTABLISHED 1817 LONDON FAMOUS BOOKS ILLUSTRATED BY LOUIS RHEAD _KIDNAPPED_ _LAMB’S TALES FROM SHAKESPEARE_ _THE ARABIAN NIGHTS_ _TREASURE ISLAND_ _GULLIVER’S TRAVELS_ _TOM BROWN’S SCHOOL DAYS_ _HANS ANDERSEN’S FAIRY TALES_ _SWISS FAMILY ROBINSON_ _ROBIN HOOD_ _ROBINSON CRUSOE_ _GRIMM’S FAIRY TALES_