As we entered the valley of Chamouni (which in fact may be considered as a continuation of those which we have followed from Bonneville and Cluses) clouds hung upon the mountains at the distance perhaps of 6000 feet from the earth, but so as effectually to conceal not only Mont Blanc, but the other _aiguilles_, as they call them here, attached and subordinate to it. We were travelling along the valley, when suddenly we heard a sound as of the burst of smothered thunder rolling above; yet there was something earthly in the sound, that told us it could not be thunder. Our guide hastily pointed out to us a part of the mountain opposite, from whence the sound came. It was an avalanche. We saw the smoke of its path among the rocks, and continued to hear at intervals the bursting of its fall. It fell on the bed of a torrent, which it displaced, and presently we saw its tawny-coloured waters also spread themselves over the ravine, which was their couch.
We did not, as we intended, visit the _Glacier de Boisson_ to-day, although it descends within a few minutes' walk of the road, wishing to survey it at least when unfatigued. We saw this glacier which comes close to the fertile plain, as we passed, its surface was broken into a thousand unaccountable figures: conical and pyramidical crystallizations, more than fifty feet in height, rise from its surface, and precipices of ice, of dazzling splendour, overhang the woods and meadows of the vale. This glacier winds upwards from the valley, until it joins the masses of frost from which it was produced above, winding through its own ravine like a bright belt flung over the black region of pines. There is more in all these scenes than mere magnitude of proportion: there is a majesty of outline; there is an awful grace in the very colours which invest these wonderful shapes—a charm which is peculiar to them, quite distinct even from the reality of their unutterable greatness.
Yesterday morning we went to the source of the Arveiron. It is about a league from this village; the river rolls forth impetuously from an arch of ice, and spreads itself in many streams over a vast space of the valley, ravaged and laid bare by its inundations. The glacier by which its waters are nourished, overhangs this cavern and the plain, and the forests of pine which surround it, with terrible precipices of solid ice. On the other side rises the immense glacier of Montanvert, fifty miles in extent, occupying a chasm among mountains of inconceivable height, and of forms so pointed and abrupt, that they seem to pierce the sky. From this glacier we saw as we sat on a rock, close to one of the streams of the Arveiron, masses of ice detach themselves from on high, and rush with a loud dull noise into the vale. The violence of their fall turned them into powder, which flowed over the rocks in imitation of waterfalls, whose ravines they usurped and filled.