The importance of the Mbomu, a northern ramification of the Ubanghi, is increased by the fact that it forms for a considerable distance a natural boundary between the Congo Free State and the French possessions. Its position, therefore, renders it of considerable political consequence. The Mbomu, although not yet entirely explored, is destined therefore to play, with its numerous branches, a large part in the history of the Congo. The country around is not only of great fertility, but also very beautiful. Here is to be found one of the finest forests in the territory. By means of the Congo and its tributaries an admirable system of communication is being established, the ramifications of which, supplemented by the telegraph and the railway, will within a few years render every part of this vast territory accessible. In proportion thereto will increase the authority of the State and its civilising influence. The growth of commerce, and the security and advancement of the native population, are, in fact, coexpansive with the extension of the facilities of intercommunication. The larger rivers—the Kassai, the Kwango, the Lualaba and the Ubanghi—are all patrolled by government steamers. [Sidenote: The Congo Lakes.] Of hardly less importance than the rivers of the Congo are the lakes. Besides the larger and navigable lakes are hundreds of smaller ones. There are thousands of shallow pools along the courses of the rivers, as those along the upper Luapula. It was that keen observer, M. Delcommune, who foretold that many of these lakes will eventually disappear. He contended that a combination of causes, chief among which being the dryness of the equatorial climate and the consequent evaporation of the water, will gradually bring about this result. By a succession of experiments, covering a period of more than two years, he discovered a diminution of the water of the Lualaba. This process of evaporation, incessantly continued for centuries, will completely absorb the water in the marshes and pools, and decrease the volume of the great rivers themselves. However, this need occasion no alarm. On the contrary, it is believed that it will aid materially the development of the country. Not only will it dry the pestiferous marshes, but it will also define the beds of the rivers, whose courses, because of the contraction of their channels, will thus be rendered simpler and more definite. By the disappearance of the pools and lagoons, now to be found in the vicinity of the rivers, hundreds of thousands of acres of valuable arable lands will be reclaimed. And as this soil, formed of alluvial deposits, is exceedingly fertile, the benefits that will accrue therefrom are incalculable. The famous polders of Holland, and the lowlands of Egypt near the mouth of the Nile, demonstrate the possibilities of such a soil.