Along the important tributaries of the Luapula is the Lufupa, which joins it not far below Nzilo. It is at the Nzilo gorge that the first cataracts on the Luapula are encountered. They continue almost uninterruptedly for forty-three miles. Another affluent of the Luapula is the Lubudi, a considerable river on the left, which, because of its breadth and volume, was at first mistaken for the main stream. The next important tributary—the Lufila—empties into the Luapula at Lake Kassali. It flows through the fertile country of the Katanga. This region, noted for its mineral resources, is described by travellers as “a land flowing with milk and honey.” It was first explored by that indefatigable pioneer, Delcommune. Until a few years ago the Katanga was ruled by the truculent tyrant, Msiri. Now that this despot is dead, the country is developing rapidly. The climate is far more healthful than in the regions around the Lower or Middle Congo. The fertility of the soil and the advantageous climate augur a brilliant future for this section of the State. The conditions are, in fact, well adapted to the needs of the white race, and here, no doubt, eventually will be established cities no less important and flourishing than those of Java. Already a railway to the Katanga is being constructed. Great deposits of copper are known to exist here, and it is expected that the development of these resources will begin a new era in the history of Central Africa. By the railway, Katanga will be brought within six weeks of the European centres. [Sidenote: An African Switzerland.] In this vicinity also are the Kibala Mountains, which will, no doubt, soon attract tourists from all parts of the world. The beauties of this section are thus described by their discoverer, Delcommune: Seated on a rock of sandstone, eagerly scanning all around us, glancing in every quarter, we were astonished by this picture, which no pencil could render. None of the loudly vaunted beauties of Switzerland and the Pyrenees, where charming scenery nevertheless exists, could rival these lost corners of the Kibala Mountains, of which the whole effect, in its turn picturesque and savage, imposing and on a grand scale, seemed softened and rendered pleasant by the brilliant equatorial vegetation. We shall now briefly refer to the more important tributaries of the Congo proper, first taking up those that join the river from the south.