It is imperative t is imperative that now at once, while the­se stupendous events are still clear in my mind, I should set them down with that exactness of detail which time may blur. But even as I do so, I am overwhelmed by the wonder of the fact that it should be our little group of the *Lost World*— Professor Challenger, Professor Summerlee, Lord John Roxton, and myself—who have passed through this amazing experience.