Across the mountain to the Glacier des Bossons; its crevasses; Ladder left behind; consequent difficulties; the Grands Mulets; Twinkling and change of Colour of the Stars; moonlight on the mountains; start with one guide; difficulties among the crevasses; the Petit Plateau; Seracs of the Dome du Gouter; bad condition of snow; the Grand Plateau; Coloured Spectra round the sun; the lost Guides; the Route missed; dangerous ice-slope; Guide exhausted; cutting steps; cheerless prospect; the Corridor; the Mur de la Cote; the Petits Mulets; food and drink disappear; Physiological experiences on the Calotte; Summit attained; the Clouds and Mountains; experiment on Sound; colour of the snow; the descent; a solitary prisoner; second night at the Grands Mulets; Inflammation of eyes; a blind man among the crevasses; descent to Chamouni; thunder on Mont Blanc 12. 86 Life at the Montanvert; glacier "Blower;" Cascade of the Talefre; difficulties in setting out lines; departure from the Montanvert; my hosts; prospect from the Glacier des Bois; Edouard Simond 13.--Expedition of 1858. 92 Origin and aim of the expedition; Laminated Structure of the ice 14.--Passage of the Strahleck. 93 Unpromising weather; appearance of the glacier and of the adjacent mountains; Transverse Protuberances; Dirt Bands; Structure; a Slip on a snow slope; the Finsteraarhorn; the Schreckhorn; extraordinary Atmospheric Effects; Summit of the Strahleck; Grand Amphitheatre; mutations of the clouds; descent of the rocks; a Bergschrund; fog in the valley; descent to the Grimsel 15. 99 Ancient Glaciers in the valley of Hasli; Rounded, Polished, and Striated Rocks; level of the ancient ice; Groovings on the Grimsel Pass; glacier of the Rhone; descent of the Rhone valley; the AEggischhorn; Cloud Iridescences; the Aletsch glacier; the Maerjelen See; Icebergs; Tributaries of the Aletsch; Grand glacier-region; crevasses; a chamois deceived 16.--Ascent of the Finsteraarhorn. 104 Character of my Guide; iridescent cloud; evening on the Faulberg; the Jungfrau and her neighbours; a Mountain Cave; the Jungfrau before dawn; contemplated visit; the Gruenhorn Luecke; Magnificent Corridor; sunrise; neve of the Viesch glacier; halt at the base of the Finsteraarhorn; Spurs and Couloirs of the mountain; Pyramidal Crest; scene of Agassiz's observations; a hard climb; discipline of such an ascent; Boiling Point; Registering Thermometer, its fate; daring utterance; descent by glissades; the Viesch glacier; hidden crevasses; a brave and competent guide