INTRODUCTION TO VOLUME FOUR THE three books gathered under the title "In Search of the Castaways" occupied much of Verne's attention during the three years following 1865. The characters used in these books were afterwards reintroduced in "The Mysterious Island," which was in its turn a sequel to "Twenty Thousand Leagues Under the Sea." Thus this entire set of books form a united series upon which Verne worked intermittently during ten years. "In Search of the Castaways," which has also been published as "The Children of Captain Grant" and as "A Voyage Around the World,"

OR, JOURNEYS AND DISCOVERIES IN AFRICA BY THREE ENGLISHMEN. COMPILED IN FRENCH BY JULES VERNE, FROM THE ORIGINAL NOTES OF DR. FERGUSON. AND DONE INTO ENGLISH BY "WILLIAM LACKLAND." PUBLISHERS' NOTE. "Five Weeks in a Balloon" is, in a measure, a satire on modern books of African travel. So far as the geography, the inhabitants, the animals, and the features of the countries the travellers pass over are described, it is entirely accurate. It gives, in some particulars, a survey of nearly the whole field of African discovery, and in this way will often serve to refresh the memory of the reader. The mode of locomotion is, of course, purely imaginary, and the incidents and adventures fictitious. The latter are abundantly amusing, and, in view of the wonderful "travellers' tales" with which we have been entertained by African explorers, they can scarcely be considered extravagant;