Mr. Leake Says, That Leo Was Very Young At The Time, And, Therefore That His Memory Probably Failed Him, When He Came To Describe The City, Which Was Many Years After His Return.]

Considering these circumstances, it will hardly be contended that the late discovery of the Landers, has made any alteration in

The nature of the question, as to the identity of the Quorra and Nigir; the sudden bend of the river to the southward, through a country, which has been equally unknown to the ancients and moderns, having always left the best informed of them in ignorance of any part of the river, except that of which the course was northerly or easterly. If then, there be sufficient reason for the belief, that these latter portions were known to the, ancients, we have only to suppose them to have had some such imperfect knowledge of the interior of North Africa, as we ourselves had attained previously to the expedition of Denham and Clapperton, to justify the application of the name Nigir to the whole course of the river. Although we find Ptolemy to be misinformed on several points concerning central Africa, yet there still remains enough in his Data, on Interior Libya and Northern Ethiopia, to show a real geographical approximation, very distant indeed from the accuracy at which science is always aiming, but quite sufficient to resolve the question as to the identity of the Nigir, in which an approximation is all that can be expected or required. Having been totally ignorant of the countries through which that river flows in a southerly direction, Ptolemy naturally mistook it for a river of the interior; he knew the middle Ethiopia to be a country watered by lakes, formed by streams rising in mountains to the southward; he was superior to the vulgar error of supposing that all the waters to the westward of the Nile flowed into that river, and he knew consequently that the rivers and lakes in the middle region, had no communication with the sea. It is but lately that we ourselves have arrived at a certainty on this important fact. We now know enough of the level of the Lake Tchad, to be assured that no water from that recipient can possibly reach the Nile. This wonderful river, of which the lowest branch is 1200 geographical miles from the Mediterranean, (measuring the distance along its course, in broken lines of 100 G.M. direct,) has no tributary from the westward below the Bahr Adda of Browne, which is more than 1600 miles from the sea, similarly measured. It is scarcely possible, therefore, that the latter point can be less, taking the cataracts into consideration than 1500 feet above the sea, whereas the following considerations lead to the belief that the Tchadda is not more than 500 feet in height.

We learn from the information of Clapperton, confirmed and amplified by that of Lander, that there exists a ridge, which about Kano and Kashna, extends forth the Yeu to the Lake Tchadda on one side, and on the other the river of Soccatoo, which joins the Quorra at a distance from the sea of about 500 miles, measured in the manner above mentioned. A similar process of measurement gives a length of 1700 miles to the whole course of the Quorra, the sources of which, according to Major Laing, are about 1600 feet above the sea; the stream, therefore, has an average fall of something less than a foot in a mile in lines of 100 geographical miles. This would give to the confluence of the river of Soccatoo with the Quorra, a height of less than 500 feet above the sea, but as that confluence occurs above the most rapid part of the main stream, 500 feet seem to be very nearly the height.

As a knowledge of the origin and course of rivers, conducts in every country to that of the relative altitude and directions of its highlands, the late discoveries on the waters of Africa have thrown great 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.

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