With the march of time it is not to be expected that geographic problems connected with the vast ice-covered ocean to the north of Siberia will be left unsolved. These coming explorers may be more fortunate than was De Long, and while profiting by his experiences they will surpass his efforts, yet their successes cannot make greater demands on the courage and constancy of them and their subordinates than were shown by the gallant De Long and his associates in the fateful voyage of the Jeannette. XIII. PAUL BELLONI DU CHAILLU, DISCOVERER OF THE DWARFS AND GORILLAS. Among the thousands of vigorous and adventurous men whom chance brought to light in foreign climes, but who by choice have cast their lot with America, by becoming citizens of the United States, there are few whose explorations and discoveries have excited more popular interest and discussion than have those of Du Chaillu, the discoverer, in modern times, of the dwarfs and the capturer of the gorilla. [Illustration: Paul Belloni Du Chaillu.] Born in Paris, July 31, 1835, the early environments of Paul Belloni Du Chaillu fostered and forecast his taste for African exploration, for his father was one of the adventurous Frenchmen whose consular appointment and commercial enterprises led him to settle at the mouth of the Gaboon, on the west coast of Africa, where his distinguished son passed his boyhood. While young Du Chaillu was, doubtless, well grounded in ordinary sciences by his instructors, the learned Jesuit fathers, of Gaboon, yet apart from regular educational institutions he imbibed other wealth of learning by observation of the rich tropical world around him, and also through familiar intercourse with neighboring tribes acquired a knowledge of native tongues and craft, of savage habits and character, which insured his after-success in African exploration. Commercial pursuits brought Du Chaillu to the United States, in 1852, when he was so strongly impressed by American institutions that he became a naturalized citizen of the United States.