This spot also presents us with several lodes of _Tin_ and _Copper_; the latter may be traced for a considerable distance from the eastern to the southern base of the hill. The _lode_ of Tin was formerly worked at the Mount, and a considerable quantity of ore obtained; any farther excavation, however, threatened to injure the foundations of the castle, and it was therefore prudently abandoned. The remains of the Mine may be seen on the south side of the hill, and should be visited by the mineralogist, who will find in the _Drift_,[30] _Tin crystals_ and _Carbonate of Copper_, besides some other minerals. Veins of Lead are also discoverable in the rocks. _Mr. Carne_[31] has lately directed the attention of the mineralogist to the _veins_ of _Mica_, which have hitherto only been found in the granite of this singular spot. They are seldom more than half an inch wide; and, although tolerably straight, are very short. They generally consist of two layers of Mica in plates, which meet in the centre of the veins. Some of the masses of _Granite_ which constitute the summit of the Mount have the appearance of an old wall retaining, in parts, a coating of plaster; this is the effect of decomposition, and of the _capel_ having in many places remained attached to the face of the rock, after the vein itself has crumbled down. The Botanist will also find some amusement among the rocks; he will observe the Tamarisk, (_Tamarix Gallica_) growing in their crevices, and relieving by a delicate verdure the harsh uniformity of their surfaces. This shrub was probably imported from Normandy by the Monks. _Asplenium Marinum_ and _Inula Helenium_ are also to be seen among the rocks--but let us leave the Botanist and Mineralogist to their researches, while we climb the hill and examine the venerable building on its summit. We ascend on the north-eastern side, by a rocky winding path, in the course of which, several remains of its ancient fortifications present themselves; thus, about the middle of the hill, there is a curtain, parallel to, and flanking the approach, at whose western end is a ravelin, through which every one is to pass, walled with three embrasures, and at the angle in the eastern shoulder is a centry box to guard the passage, and there was formerly also an iron gate; after having passed this ruin, we turn to our left, and ascend by a flight of broken steps to the door of the castle, whose appearance is much more monastic than martial. The most ancient parts of the building are the Entrance, with the Guardroom on the left hand; the Chapel, and the former Refectory, or common hall of the Monks. The other parts are of a modern date, although the style of their architecture confers upon them a corresponding air of antiquity.