Mont Blanc itself is bounded by the two glaciers of Miage, the glaciers de la Brenva and du Géant, the Val Véni and the Valley of Chamounix. A long ridge runs out towards the N.N.E. from the summit, through Mont Maudit, to the Aiguille du Midi. Another ridge proceeds towards the N.W., through the Bosse du Dromadaire to the Dôme du Goûter; this then divides into two, of which one continues N.W. to the Aiguille du Goûter, and the other (which is a part of the main ridge of the chain) towards the W. to the Aiguille de Bionnassay. The two routes which are commonly followed for the ascent of Mont Blanc lie between these two principal ridges—one leading from Chamounix, _viâ_ the Grands Mulets, the other from the village of Bionnassay, _viâ_ the Aiguille and Dôme du Goûter. The ascent of Mont Blanc has been made from several directions besides these, and perhaps there is no single point of the compass from which the mountain cannot be ascended. But there is not the least probability that any one will discover easier ways to the summit than those already known. I believe it is correct to say that the Aiguille du Midi and the Aiguille de Miage were the only two summits in the chain of Mont Blanc which had been ascended at the beginning of 1864.(127) The latter of these two is a perfectly insignificant point; and the former is only a portion of one of the ridges just now mentioned, and can hardly be regarded as a mountain separate and distinct from Mont Blanc. The really great peaks of the chain were considered inaccessible, and, I think, with the exception of the Aiguille Verte, had never been assailed. The finest, as well as the highest peak in the chain (after Mont Blanc itself), is the Grandes Jorasses. The next, without a doubt, is the Aiguille Verte. The Aiguille de Bionnassay, which in actual height follows the Verte, should be considered as a part of Mont Blanc; and in the same way the summit called Les Droites is only a part of the ridge which culminates in the Verte. The Aiguille de Trélatête is the next on the list that is entitled to be considered a separate mountain, and is by far the most important peak (as well as the highest) at the south-west end of the chain. Then comes the Aiguille d’Argentière, which occupies the same rank at the north-east end as the last-mentioned mountain does in the south-west. The rest of the aiguilles are comparatively insignificant; and although some of them (such as the Mont Dolent) look well from low elevations, and seem to possess a certain importance, they sink into their proper places directly one arrives at a considerable altitude.