Then followed troubles in Uganda, and it was not till 1900 that the work of exploration was resumed. To make the story clear, it is necessary to explain that the range runs practically north and south, and that about half-way it is cut into by two deep valleys--the Mobuku running to the east and the Butagu running to the Semliki on the west. Fort Portal at the northern end is the nearest station; and as from it the eastern side is the more accessible, it was natural that the Mobuku valley should be chosen as the best means of access. In 1900 Mr. Moore reached its head, and ascended the mountain called Kiyanja to the height of 14,900 feet. He had no sight of the range as a whole, but he believed this to be the highest peak, and put the summit at about 16,000 feet. In the same year Sir Harry Johnston followed this route. He ascended to the height of 14,828 feet on Kiyanja, and saw from the Mobuku valley a mountain to the north, which he named Duwoni. He came to the conclusion that the highest altitude of the range was not under 20,000 feet, and in this view he was followed by other travellers, like Mr. Wylde, Mr. Grogan, and Major Gibbons, none of whom, however, actually made ascents of any peak. The first serious mountaineering expedition was made in 1905 by Mr. Douglas Freshfield and Mr. A. L. Mumm, who suffered from such appalling weather that they had to give up the attempt. Being experienced mountaineers, however, they reached some valuable conclusions. From the plains they had a clear view of the tops, and ascertained that the mountain called Kiyanja at the head of the Mobuku valley was certainly lower than a twin-peaked snow mountain beyond it to the west. They also placed the extreme height of the range at no more than 18,000 feet. Meanwhile Lieutenant Behrens, of the Anglo-German Boundary Commission, had made an elaborate triangulation, and gave to the twin tops of the highest peak altitudes of 16,625 feet and 16,549 feet--measurements, let it be noted, which were only a few hundred feet out. One other expedition, which occupied the close of the same year and the beginning of 1906, deserves mention. Mr. A. F. R. Wollaston, of a British Museum party, found an old ice-axe in a hut (probably left by Mr. Freshfield), and, with a few yards of rotten rope, set off with a companion to climb Kiyanja. He reached a height of 16,379 feet, and also climbed a peak to the north, which he believed wrongly to be Duwoni, and which now very properly bears his name. The whole performance was a brilliant adventure, and Mr. Wollaston has published the story of his travels in a delightful book.* * _From Ruwenzori to the Congo_ (John Murray).