There can be no doubt that the most horrible topic connected with slavery is slave-hunting; and this is carried on not only for the purpose of supplying the foreign market, but, in a far more extensive degree, for supplying the wants of domestic slavery. Hence it was necessary that I should become acquainted with the real state of these most important features of African society, in order to speak clearly about them; for with what authority could I expatiate on the horrors and the destruction accompanying such an expedition, if I were not speaking as an eye-witness? But having myself accompanied such a host on a grand scale, I shall be able, in the third volume of my narrative, to lay before the public a picture of the cheerful comfort, as well as the domestic happiness, of a considerable portion of the human race, which, though in a low, is not at all in a degraded state of civilization, as well as the wanton and cruel manner in which this happiness is destroyed, and its peaceful abodes changed into desolation. Moreover, this very expedition afforded me the best opportunity of convincing the rulers of Bórnu of the injury which such a perverse system entails upon themselves. But besides this, it was of the utmost importance to visit the country of the Músgu; for while that region had been represented by the last expedition as an almost inaccessible mountain-chain, attached to that group which Major Denham observed on his enterprising but unfortunate expedition with Bú-Khalúm, I convinced myself on my journey to Ádamáwa, from the information which I gathered from the natives, that the mountains of Mándará are entirely insulated towards the east. I considered it, therefore, a matter of great geographical importance to visit that country, which, being situated between the rivers Shárí and Bénuwé, could alone afford the proof whether there was any connection between these two rivers.