Goes beyond the plan of "How It Works," explaining clearly the interesting principles on which various wonderful processes depend. Makes a boy think. 308 Illustrations. (2nd Edition.) 6s. net. VICTORIES OF THE ENGINEER. Explains the construction of great engineering works, such as railways, bridges, reservoirs, ships, tunnels, etc. 282 Illustrations. (7th Edition.) 6s. net. A BOOK OF THE SEA. Al about ships, navigation, diving, lighthouses--in fact, everything in connection with seafaring. 334 Illustrations. (2nd Edition.) 6s. net. THE BOYS’ GUIDE. A boy’s encyclopaedia of sports, pastimes, hobbies, and handicrafts. 728 Illustrations. (4th Edition.) 7s. 6d. net.