We shook the rope away from us, and went rapidly down the rocks. The day was well advanced when we reached the cabin, and between it and the base of the pyramid we missed our way. It was late when we regained it, and by the time we reached the ridge of the Hörnli we were unable to distinguish rock from ice. We should have fared better than we did if we had kept along the ridge and felt our way to the Schwarz See, whence there would have been no difficulty in reaching Zermatt, but we left the Hörnli to our right, and found ourselves incessantly checked in the darkness by ledges and precipices, possible and actual. We were afterwards entangled in the woods of Zmutt, carving our way wearily through bush and bramble, and creeping at times along dry and precipitous stream-beds. But we finally struck the path and followed it to Zermatt, which we reached between one and two o’clock in the morning.
Having work to do for the Norwich meeting of the British Association, I remained several days at the Riffel, taking occasional breathings with pleasant companions upon the Riffelhorn. I subsequently crossed the Weissthor with Mr. Paris to Mattmark, and immediately afterwards returned to England.
On the 4th of September, Signor Giordano, to whom we are indebted for a very complete geological section of the Matterhorn, with Joseph Maquignaz and Carrel as guides, followed my route over the mountain. In a letter dated Florence, December 31, 1868, he writes to me thus:
‘Quant à moi, je dirai que vraiment, j’ai trouvé cette fois le pic assez difficile.... J’ai surtout trouvé difficile la traversée de l’arête qui suit le pic Tyndall du côté de l’Italie. Quant au versant suisse, je l’ai trouvé moins difficile que je ne croyais, parce que la neige y était un peu consolidée par la chaleur. En descendant le pic du côté de Zermatt j’ai encouru un véritable danger par les avalanches de pierres.... Un de mes deux guides a eu le havresac coupé en deux par un bloc, et moi-même j’ai été un peu contusionné.’
XXV.
ASCENT OF THE ALETSCHHORN.
The failure through bad weather of a former attempt upon the Aletschhorn has been already recorded; but a succession of cloudless days at the Bel Alp in August 1869 stirred up the desire to try again. This was strengthened by the wish to make a series of observations from the greatest accessible elevation on the colour and polarisation of the sky. I had no guide of my own, but the Knecht at the hotel had been up the mountain, and I thought that we two might accomplish the ascent without any other assistance. It was the first time the mountain had been attempted by a single guide, and I was therefore careful to learn whether he was embarrassed by either doubt or fear. There was no doubt or fear in the matter: he really wished to go with me. His master (the proprietor of the hotel) had asked him whether he was not undertaking too much. ‘I am undertaking no more than my companion,’ was his reply.
At twenty minutes past two we quitted the Bel Alp. The moon, which seven hours previously had cleared the eastern mountain-tops with a visible motion, was now sloping to the west. The light was white and brilliant, and shadows of corresponding darkness were cast upon the earth. The larger stars were out, those near the horizon especially sparkling with many-coloured fires. The Pleiades were near the zenith, while Orion hung his sword a few degrees above the eastern horizon. Our path lay along the slope of the mountain, parallel to the Oberaletsch glacier, the lateral moraine of which was close to us on our right. After climbing sundry grass acclivities we mounted this moraine, and made it our pathway for a time. At a certain point the shingly ridge became depressed, opening a natural passage to the glacier. We found the ice ‘hummocky,’ and therefore crossed it to a medial moraine composed of granite débris and loaded here and there with clean granite blocks of enormous size. Beyond this moraine we found smoother ice and better light, for we had previously journeyed in the shadow of the mountains.
We marched upwards along the glacier chatting sociably at times, but at times stilled into silence by the stillness of the night. ‘Es tagt!’ at length exclaimed my companion. It dawns! Orion had moved upwards, leaving space between him and the horizon for the morning star. All the east was belted by that ‘daffodil sky’ which in some states of the atmosphere announces the approach of day in the Alps. We spun towards the east. It brightened and deepened, but deeper than the orange of the spectrum it did not fall. Amid this the mountains rose. Silently and solemnly their dark and dented outlines rested against the dawn.
The mass of light thus thrown over the shaded earth long before the sun appeared above the horizon came not from illuminated clouds, but from matter far more attenuated than clouds—matter which maintains comparative permanence in the atmosphere, while clouds are formed and dissipated. It is not light reflected from concentric shells of air of varying density, of which our atmosphere may be rightly assumed to be made up; for the light reflected from these convex layers is thrown, not upon the earth at all, but into space. The ‘rose of dawn’ is usually ascribed, and with sufficient correctness, to transmitted light, the blue of the sky to reflected light; but in each case there is both transmission and reflection. No doubt the daffodil and orange of the east this morning must have been transmitted through long reaches of atmospheric air, and no doubt it was during this passage of the rays that the selective winnowing of the light occurred which gave the sky its tint and splendour. But if the distance of the sun below the horizon when the dawn first appeared betaken into account, it will become evident that the solar rays must have been caused to swerve from their rectilineal course by reflection. The refraction of the atmosphere would be wholly incompetent to bend the rays round the convex earth to the extent now under contemplation.