This may be considered as the first picture on record of the northern part of Africa; a country, which, even after the lapse of two thousand years, presents to the eye of science, as regards its interior recesses, a blank in geography, a physical and not less a moral problem; a dark and bewildering mystery. The spirit of enterprise has carried our mariners to the arctic seas, braving the most appalling dangers in the solution of a great geographical problem; by the same power, civilization has been carried into the primeval forests of the American continent, and cities have arisen in the very heart of the Andes. The interior of Africa, however, notwithstanding its navigable rivers, has been hitherto almost a sealed chapter in the history of the globe. The deserts, which extend from Egypt to the Atlantic, and which cover a great surface of the interior, have proved a barrier to the march of conquest, or civilization; and whatever science has gained, has been wrested by the utmost efforts of human perseverance and the continual sacrifice of human life. It must, however, be allowed that there are obstacles existing to the knowledge and the civilization of central Africa, which cannot be overcome by the confederated power of human genius. Extending 5000 miles in length, and nearly the same extent in breadth, it presents an area, according to Malte Brun, of 13,430,000 square miles, unbroken by any estuary, or inland sea, and intersected by a few long or easily navigable rivers; all its known chains of mountains are of moderate height, rising in terraces, down which the waters find their way in cataracts, not through deep ravines and fertile valleys. Owing to this configuration, its high table lands are without streams, a phenomenon unknown in any other part of the world; while, in the lower countries, the rivers, when swelled with the rains, spread into floods and periodical lakes, or lose themselves in marshes. According to this view of the probable structure of the unknown interior, it appears as one immense flat mountain, rising on all sides from the sea by terraces; an opinion favoured by the absence of those narrow pointed promontories, in which other continents terminate, and of those long chains of islands, which are, in fact, submarine prolongations of mountain chains extending across the main land. It is, however, not impossible, that in the centre of Africa, there may be lofty table lands like those of Quito, or valleys like that of Cashmeer, where, as in those happy regions, spring holds a perpetual reign.