The author knows these subjects from a practical standpoint. Each book is printed from new plates on a good quality of paper and bound in cloth. Each book wrapped in a jacket printed in colors. Price 60c each 1. Boy Inventors' Wireless Triumph 2. Boy Inventors' and the Vanishing Sun 3. Boy Inventors' Diving Torpedo Set 4. Boy Inventors' Flying Ship 5. Boy Inventors' Electric Ship 6. Boy Inventors' Radio Telephone The "How-to-do-it" Books These books teach the use of tools; how to sharpen them; to design and layout work. Printed from new plates and bound in cloth. Profusely illustrated. Each book is wrapped in a printed jacket. Price $1.00 each 1. Carpentry for Boys 2. Electricity for Boys 3. Practical Mechanics for Boys For Sale by all Book-sellers, or sent postpaid on receipt of the above price. M. A. DONOHUE & COMPANY 711 SOUTH DEARBORN STREET, CHICAGO BOY SCOUT SERIES By G. HARVEY RALPHSON Just the type of books that delight and fascinate the wide awake boys of today. Clean, wholesome and interesting; full of mystery and adventure. Each title is complete and unabridged. Printed on a good quality of paper from large, clear type and bound in cloth. Each book is wrapped in a special multi-colored jacket. 1. Boy Scouts in Mexico; or, On Guard with Uncle Sam 2. Boy Scouts in the Canal Zone; or, the Plot against Uncle Sam 3. Boy Scouts in the Philippines; or, the Key to the Treaty Box 4. Boy Scouts in the Northwest; or, Fighting Forest Fires 5. Boy Scouts in a Motor Boat; or Adventures on Columbia River 6. Boy Scouts in an Airship; or, the Warning from the Sky 7. Boy Scouts in a Submarine; or, Searching an Ocean Floor 8. Boy Scouts on Motorcycles; or, With the Flying Squadron 9. Boy Scouts beyond the Arctic Circle; or, the Lost Expedition 10. Boy Scout Camera Club; or, the Confessions of a Photograph 11. Boy Scout Electricians; or, the Hidden Dynamo 12. Boy Scouts in California; or, the Flag on the Cliff 13. Boy Scouts on Hudson Bay; or, the Disappearing Fleet 14. Boy Scouts in Death Valley; or, the City in the Sky 15. Boy Scouts on Open Plains; or, the Roundup not Ordered 16. Boy Scouts in Southern Waters; or the Spanish Treasure Chest 17. Boy Scouts in Belgium; or, Imperiled in a Trap 18. Boy Scouts in the North Sea; or, the Mystery of a Sub 19. Boy Scouts Mysterious Signal or Perils of the Black Bear Patrol 20. Boy Scouts with the Cossacks; or, a Guilty Secret For Sale by all Book-sellers, or sent postpaid on receipt of 60 cents M. A. DONOHUE & COMPANY 711 SOUTH DEARBORN STREET, CHICAGO