I shall avail myself, therefore, of the liberty allowed to every writer who does not design a purely didactical work, by not unnecessarily troubling myself whether the animals whose organization or characteristics attract our notice, particularly affect a low or elevated locality, the shady wood or open plain, the pestilential swamp or the river-watered valley, and by permitting myself, except in the case of some evident and constant partiality, to place them where the most eminent observers assure us they are really, if not exclusively, met with. On this account, the plains, more or less densely wooded and broken up, which occupy the greater portion of the African Continent, will readily furnish us with the opportunity of studying the majority of animals indigenous to that continent, and, in general, to the entire Tropical zone of the Old World. In fact, nearly all the genera of Mammals, Birds, and Reptiles, are there represented by their most characteristic types. Clothed with a luxuriant vegetation; watered by periodical rains and numerous streams; intersected by thick masses of forests, groves, and thickets; relieved from monotonous uniformity by mountain and ravine, by marshes and lakes of vast extent,--these fields ever exhibit that aspect of busy life under which we love to represent to ourselves the earth when she first emerged from the boiling seas of Chaos, when the forces which had seethed within her bowels for so many thousands of centuries had been tranquillized by the Divine will, and she was despatched on her mysterious course to be the theatre of man's glorious destiny. * * * * *