The charm of the book is its strangeness. It tells of a kind of mountaineering to which the world can show no parallel. When Lhasa had been visited, Ruwenzori remained, with the gorges of the Brahmaputra, one of the few great geographical mysteries unveiled. Happily the unveiling has not killed the romance, for the truth is stranger than any forecast. If the Mountains of the Moon are lower than we had believed, they are far more wonderful. Here you have a range almost on the Equator, rising not from an upland, like Kilimanjaro, but from the "Albertine Depression," which is 600 or 700 feet below the average level of Uganda; a range of which the highest peaks are 1,000 feet higher than Mont Blanc, which is draped most days of the year in mist, and accessible from the plains only by deep-cut glens choked with strange trees and flowers. The altitude would in any case give every stage of climate from torrid to arctic, but the position on the Line adds something exotic even to familiar mountain sights, draping a glacier moraine with a tangle of monstrous growths, and swelling the homely Alpine flora into portents. The freakish spirit in Nature has been let loose, and she has set snowfields and rock _arêtes_ in the heart of a giant hothouse. [Illustration: The Peaks and Valleys of Ruwenzori. The Route to Ruwenzori.] The Duke of the Abruzzi was faced at the start with a deplorable absence of information. Even the season when the weather was most favourable was disputed. Mr. Freshfield, following Sir Harry Johnston's advice, tried November, and found a perpetual shower-bath. Warned by this experience, the Duke selected June and July for the attempt, and was fortunate enough to get sufficient clear days to complete his task, though he was repeatedly driven into camp by violent rain. Another matter in doubt was the best means of approach to the highest snows. The obvious route was the Mobuku valley, but by this time it was pretty clear that Kiyanja, the peak at its head, was not the highest, and it was possible that there might be no way out of the valley to the higher western summits. Still, it had been the old way of travellers, and since the alternative was the Butagu valley right on the other side of the range, the Duke chose to follow the steps of his predecessors.