Mr. Browne has the advantage in point of materials proper for mathematical geography; whilst Mr. Horneman’s range of inquiry, though equally extended, consists more of general notices, in the nature of sketches. Both possess very great merit; both appear indefatigable in collecting the most useful matter that either presented itself, or could be procured: and how much soever a person at his ease, and in a state of perfect security, may blame the want of a clear and connected series of notices, respecting the geography and present state of the countries treated of; yet it should be considered, under what disadvantages, and at what hazard, a European traveller in the interior of Africa, collects his information: and which, the histories of these gentlemen’s proceedings, now before the Public, as well as those of their old acquaintance Mr. Park, abundantly shew. Mr. Browne’s materials consist of a line of 16 degrees of latitude, from Cairo to the capital of Darfoor; corrected by observations of latitude and longitude: together with an extension of this line southward, six degrees farther, by enquiries amongst the natives, and other travellers, on the spot. His inquiries reached to about the parallel of 8 degrees north; in which position there were pointed out to him, the heads of the _Bahr Abiad_, or _White River_, taken for the most remote, and long sought for, head of the EGYPTIAN NILE. And besides this line, his inquiries were pointed _eastward_ and _south-east_, to the borders of Abyssinia; _westward_ and _south-west_, to Bornu; also to other countries, not before heard of in Europe; the whole forming an extent of more than 15 degrees of longitude. The line from Cairo to the head of the White River, is in length upwards of 1360 G. miles: or more than 1440, from the mouth of the Nile; taken in _direct_ distance. In its bearing, it varies so little from the meridian, that the head of the river bears only about a point and a half to the west of south, from the place of its discharge into the Mediterranean. This route departing from the Nile at _Siout_, first passes through, and fixes the position of the _Greater Oasis_; then successively, through the positions of Sheb, Selimé, Leghea, and Bir-el-Malha, in the way to Darfoor. From the known caution and accuracy of Mr. Browne, this line becomes an important acquisition: and in respect of the place of the head of the White River, his information is corroborated generally, by that collected by Ledyard and Maillet, at Cairo. In other parts of his geography, he is corroborated by the recent information of Mr. Horneman; by the notices in Edrisi; by Maillet; and even by Bruce himself.