In attempting to get what is little less than a history of the world, from a special point of view, into a couple of hundred duodecimo pages, I have had to make three bites at my very big cherry. In the Appendix I have given in chronological order, and for the first time on such a scale in English, the chief voyages and explorations by which our knowledge of the world has been increased, and the chief works in which that knowledge has been recorded.