The greatest altitude reached by us, after being worked out and all connections applied, was about 10,677 feet above the sea. The altitude of the snow peak above this would probably be about 6,000 feet, making the mountain, say, 16,600 feet high. This, though, is not the highest peak in the Ruwenzori cluster. With the aid of a field-glass I could make out the form of the mountain-top perfectly. The extreme top of the peak is crowned with an irregular mass of jagged and precipitous rock, and has a distinct crater-like form. I could see through a gap in the near side a corresponding rim or edge on the farther of the same formation and altitude. From this crown of rock, the big peak slopes to the eastward at a slope of about 25° until shut out from view by an intervening peak; but to the west the slope is much steeper. Of the snow, the greater mass lay on that slope directly nearest us, covering the slope wherever its inclination was not too great. The largest bed of snow would cover a space measuring about 600 by 300 feet, and of such a depth that in only two spots did the black rock crop out above its surface. Smaller patches of snow extended well down into the ravine; the height from the lowest snow to the summit of the peak would be about 1200 feet or 1000 feet. To the E.N.E. our horizon was bounded by the spur which, standing directly behind our main camp, and mounting abruptly, takes a curve in a horizontal plane and centres on to the snow peak. Again that spur which lay south of us also radiated from the two highest peaks. This would seem to be the general form of the mountain, namely, that the large spurs radiate from the snow-peaks as a centre, and spread out to the plains below. This formation on the west side of the mountain would cause the streams to flow from the centre, and flow on, gradually separating from each other until they reached the plains below. Thence they turn to W.N.W., or trace their courses along the bottom spurs of the range and run into the Semliki River, and on to the Albert Nyanza. Of the second snow-peak, which we have seen on former occasions, I could see nothing, owing to the “Twin Cones” intervening. This peak is merely the termination, I should think, of the snowy range we saw when at Kavalli, and has a greater elevation, if so, than the peak we endeavoured to ascend. Many things go to show that the existence of these peaks is due to volcanic causes. The greatest proof that this is so lies in the numbers of conical peaks clustering round the central mass on the western side. These minor cones have been formed by the central volcano getting blocked in its crater, owing to the pressure of its gases not being sufficient to throw out the rock and lava from its