reat light on its orography. The sources of the largest, or rather
longest of its rivers, namely, the white or true Nile, now appears to
be in a point nearly equidistant from the Indian and Atlantic Oceans
in one direction, and from the Mediterranean and the Cape of Good
Hope on the other. These central summits, it is fair to suppose, are
at least as high as the snowy peak Samen, in Abyssinia, which is the
culminating point towards the sources of the minor branch or Blue
Nile, and that they are covered, therefore, with perpetual snow. From
hence flow the White Nile, the Djyr, the Bahr Culla, the Congo, and
several rivers of the coast of Zanguebar.

As a part of these great African Alps was described to Denham as
lying beyond the mountain of Mendefy, the latter would seem to be an
advanced northerly summit of them. The range is probably united to
the eastward with the mountains of Abyssinia, and to the westward,
terminates abruptly in some lofty peaks on the eastern side of the
delta of the Quorra, but not till after it has sent forth a lower
prolongation, which crosses the course of the Quorra nearly at right
angles, and terminates at the end of 1500 miles, at the sources of
the Quorra, Gambia, and Senegal. A minor counterfort advances from
the central range to the northwestward, commencing about the Peak of
Mendefy, and vanishing at the end of about 900 miles in the desert of
the Tuaricks. It gives rise to the two Sharys, which flow in opposite
directions to the Quorra and the Lake Tchadda, and further north to
the streams which flow to the same two recipients from about Kano and
Kashna.

Though the knowledge of interior Africa now possessed by the
civilized world, is the progressive acquisition of many enterprising
men, to all of whom we are profoundly indebted, it cannot be denied
that the last great discovery has done more than any other to place
the great outline of African geography on a basis of certainty. When
to this is added the consideration that it opens a maritime
communication into the centre of the continent, it may be described
as the greatest geographical discovery that has been made since that
of New Holland. Thrice during the last thirty years, it has been on
the eve of accomplishment; first when Horneman had arrived from
Fezzan and Nyffle, secondly when Park had navigated the Quorra as far
as Boussa, and lastly when Tuckey, supplied with all possible means
For prosecuting researches by water, was u