Might we have been able to obtain a view over the Semliki Valley we should have enjoyed one of exceeding interest. But we were unable to see more through the thick sluggish mist than that, wide as it may be, it is covered with a deep forest. The mist soared over the whole in irregular streams or in one heavy mass, which gave it the aspect of an inverted sky. Sometimes for a brief period a faint image of endless woods loomed out, but the mist streamed upward through the foliage as though a multitude of great geysers emitted vapours of hot steam. In the immediate foreground it was not difficult to distinguish elevations and depressions, or round basin-like hollows filled with the light-green forests of banana groves. One of the Twin Cones was visible a few hundred yards from camp, and after a careful measurement with alta-azimuth it was found to be 12,070 feet. [Sidenote: 1889. June 5. Mtarego.] After a halt of three days we struck camp, descended the precipitous walls of the gorge of the Rami-lulu, and, traversing the narrow level, shortly ascended up the equally wall-like slope on the other side, discovering a fact which, but for the ascent and descent, we might not have thought of, namely, that the Rami-lulu had channelled this deep ditch through a terrace formed of the washings and scourings of soil off the slopes. It was a débris, consisting of earth, rock, boulders, and gravel, which had been washed down the gap and accompanied by landslips of so great a magnitude as to have choked up the course of the river and formed quite an extensive and elevated tract, but the Rami-lulu had eventually furrowed and grooved itself deeply through, and so the great bank of material lies cut in two, to the depth of 200 feet, sufficiently instructive.