This narrative will comprehend not only all the explorations made in past ages, but also all the new discoveries which have of late years so greatly interested the scientific world. In order to give to this work--enlarged perforce by the recent labours of modern travellers, --all the accuracy possible, I have called in the aid of a man whom I with justice regard as one of the most competent geographers of the present day: M. Gabriel Marcel, attached to the Bibliothèque Nationale. With the advantage of his acquaintance with several foreign languages which are unknown to me, we have been able to go to the fountain-head, and to derive all information from absolutely original documents. Our readers will, therefore, render to M. Marcel the credit due to him for his share in a work which will demonstrate what manner of men the great travellers have been, from the time of Hanno and Herodotus down to that of Livingstone and Stanley.