Having passed a level tract of several acres covered with the aspen, poplar, a few birches, and pines, we arrived at a small stream running towards the south, nearly parallel to the base of the conic part of the mountain which forms the summit of the peak. From this spot we could distinctly see almost the whole of the peak: its lower half thinly clad with pines, junipers, and other evergreen trees; the upper, a naked conic pile of yellowish rocks, surmounted here and there with broad patches of snow. But the summit appeared so distant, and the ascent so steep, that we began to despair of accomplishing the ascent and returning on the same day. About the small stream before mentioned, we saw an undescribed white-flowered species of caltha, some pediculariæ, the shrubby cinque-foil (potentilla fruticosa, Ph.) and many alpine plants. At this point a change is observed in the character of the rock, all that which constitutes the peak beyond containing no mica. It is a compact, fine-grained aggregate of quartz, felspar, and hornblende; the latter in small proportion, and sometimes wholly wanting. The day was bright, and the air nearly calm. As we ascended rapidly, we could perceive a manifest {216} change of temperature; and before we reached the outskirts of the timber, a little wind was felt from the north-east. On this part of the mountain is frequently seen the yellow-flowered stone-crop (sedum stenopetalum, Ph.), almost the only herbaceous plant which occurs in the most closely wooded parts of the mountain. We found the trees of a smaller size, and more scattered in proportion to the elevation at which they grew; and arrived at about twelve o'clock at the limit above which none are found. This is a defined line, encircling the peak in a part which, when seen from the plain, appeared near the summit; but when we arrived at it, a greater part of the whole elevation of the mountain seemed still before us. Above the timber the ascent is steeper, but less difficult than below; the surface being so highly inclined, that the large masses, when loosened, roll down, meeting no obstruction until they arrive at the commencement of the timber. The red cedar, and the flexile pine,[4] are the trees which appear at the greatest elevation. These are small, having thick and extremely rigid trunks; and near the commencement of the naked part of the mountain, they have neither limbs nor bark on that side which is exposed to the descending masses of rocks. It may appear a contradiction to assert, that trees have grown in a situation so exposed as to be unable [to] produce or retain bark or limbs on one side; yet of the fact that they are now standing and living in such a situation there can be no doubt. It is, perhaps, probable the timber may formerly have extended to a greater elevation on the sides of this peak than at present, so that those trees which are now on the outskirts of the forest were formerly protected by their more exposed neighbours.