ACKNOWLEDGMENT
The Author desires to express his thanks to Dr. William K. Gregory, of the American Museum of Natural History, as well as to the other Museum authorities, for their courtesy and assistance in the matter of illustrations, and in the preparation of the text. The book does not pretend, of course, to be a strictly scientific work. Many liberties have been taken, in order to render the subject interesting to the youthful mind. Man's early inventions did not come about so simply as is pictured in the various chapters. But the development of civilisation is a romance, and only by so treating it can we hope to enlist the interest of the young reader. It is sufficient that the story rests upon a foundation of fact.