After resting some two hours at La Grave, we proceeded by the two tunnels under the hamlet of Ventelong--one of which is 650 and the other 1,800 feet long--to the village of Villard d'Arene, which, though some five thousand feet above the level of the sea, is so surrounded by lofty mountains that for months together the sun never shines on it. From thence a gradual ascent leads up to the summit of the Col de Lauteret, which divides the valley of the Romanche from that of the Guisanne. The pastures along the mountain-side are of the richest verdure; and so many rare and beautiful plants are found growing there that M. Rousillon has described it as a "very botanical Eden." Here Jean Jacques Rousseau delighted to herborize, and here the celebrated botanist Mathonnet, originally a customs officer, born at the haggard village of Villard d'Arene, which we have just passed, cultivated his taste for natural history, and laid the foundations of his European reputation. The variety of temperature which exists along the mountain-side, from the bottom to the summit, its exposure to the full rays of the sun in some places, and its sheltered aspect in others, facilitate the growth of an extraordinary variety of beautiful plants and wild flowers. In the low grounds meridional plants flourish; on the middle slopes those of genial climates; while on the summit are found specimens of the flora of Lapland and Greenland. Thus almost every variety of flowers is represented in this brilliant natural garden--orchids, cruciferæ, leguminæ, rosaceæ, caryophyllæ, lilies of various kinds, saxifrages, anemones, ranunculuses, swertia, primula, varieties of the sedum, some of which are peculiar to this mountain, and are elsewhere unknown. After passing the Hospice near the summit of the Col, the valley of the Guisanne comes in sight, showing a line of bare and rugged mountains on the right hand and on the left, with a narrow strip of land in the bottom, in many parts strewn with stones carried down by the avalanches from the cliffs above. Shortly we come in sight of the distant ramparts of Briançon, apparently closing in the valley, the snow-clad peak of Monte Viso rising in the distance. Halfway between the Col and Briançon we pass through the village of Monestier, where, being a saint's day, the bulk of the population are in the street, holding festival. The place was originally a Roman station, and the people still give indications of their origin, being extremely swarthy, black-haired, and large-eyed, evidently much more Italian than French.