I have observed that the Mission, the first transactions of which are described in these volumes, is entitled to be called successful. Although the original promoter and director died just as he was on the point of reaching the termination of his journey, his enterprising companions, Drs. Barth and Overweg, seem to have carried on and developed admirably the plan at first laid down. If they be spared to return to Europe they will bring home, no doubt, geographical information so valuable that all Mr. Richardson's predictions will be found to be amply fulfilled. As it is, however, the object of our practical fellow-countryman may be said to have been accomplished. He did not lay so much stress on the accurate determination of latitude and longitude, of the heights of mountains and the courses of valleys, as on matters that come more nearly home to human sympathies. The abolition of the system of slavery--many affecting illustrations of which will be found in these volumes--seems to have engaged the chief of his attention. It was with this benevolent object that he originally turned his attention to Africa; and he had become convinced that the best means of effecting it was to encourage legitimate traffic between Europe and the great nurseries of slaves. Among other things, he wished to show the possibility of entering into treaties of amity and commerce with the most important states of Central Africa; and although these treaties may not turn out to be of great immediate utility, it is always worth while that future explorers should know, that on the borders of Lake Tchad there is a power which professes to be united with England in formal ties of friendship, and that the Sultan of Bornou has never shown any disposition to break his promises or secede from his engagements. As to the question, whether legitimate commerce can advantageously be carried on across the Sahara, and substituted for the frightful traffic in human beings, I do not consider that it is as yet decided; but Mr. Richardson's researches will throw great light on this interesting subject.