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.

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