THE WORLD'S MESSENGERS

First class informational material about the history (briefly), and present forms of communication, -- telegraph, telephone, radio, and so on. Modern developments simply and adequately explained. Most adults would find it illuminating, on one point or another, and yet it is simple enough for any intelligent boy or girl of ten and up. The line drawings are a bit crude; the diagrams and photographs, good. Bibliographical material for those who want to delve deeper.