The conquest of Mount Stanley was the culminating point of the expedition. After that, the topography being known, it only remained to ascend the four massifs of Speke, Emin, Gessi, and Luigi di Savoia. In addition, the Bujuku valley, with its tributary the Migusi, was thoroughly explored. The aim of the Duke being completeness, many of the peaks were ascended several times to verify the observations. There is an account of how from one peak in a sudden blink of fine weather the leader saw two portions of the expedition in different parts of the range moving about their allotted tasks. The result of this wise organization is that to-day the world knows every peak, glacier, and valley in Ruwenzori far more minutely than many habitable parts of the East African plateau. The expedition was not only a fine adventure, but a wonderful piece of solid and enduring scientific work. No Englishman will grudge that the honours of the pioneer fell to so brilliant a climber and so unwearied a traveller as the Duke of the Abruzzi. The Italian name has always stood high in mountaineering annals, and the Duke has long ago earned his place in that inner circle of fame which includes Mummery and Guido Rey, Moore and Zsigmondy. [Illustration: The Valley to the West of Mount Baker. (_By permission of Messrs. Arch. Constable & Co., Ltd._)] The riddle of equatorial snow has been solved, and there is nothing very startling in the answer. The upper part of the mountains has no marvels to show equal to the giant groundsels and lobelias and the forests of heath on the lower slopes. The glaciers are all small, without tributaries, as in Norway; and there are no real basins, but merely "a sort of glacier caps from which ice digitations flow down at divers points." All the same, the glacier formation is more respectable than Mr. Freshfield thought, for he saw only the small ice-stream at the head of the Mobuku, and was not aware of the much greater one from Mount Stanley which descends to the upper Bujuku valley. The limit of perpetual snow is about 14,600 feet. Mr. Freshfield was so struck by the small size of the Mobuku torrent where it issues from the glacier, and by its clearness, that he thought it must come from some underground spring rather than from a real melting of the ice. He maintained that tropical glaciers were consumed mainly by evaporation and only in a small degree by melting. The Duke has, however, made it clear that the glaciers of Ruwenzori are subject to the same conditions as those of the Alps, and that their streams are true glacier torrents. The limpidity of the water he ascribes to their almost complete immobility, which means that there is no grinding of the detritus in their beds.