which we have been just describing. In these places the granitic sand is becoming indurated by the slow infiltration of water holding iron in solution, and which appears to be derived from the decomposing hills above it. Some fine specimens of this "_regenerated_" granite have been placed in the Geological Society's cabinet at Penzance. We now return to the Land's End,--from which we should proceed to visit a promontory, called "_Castle Treryn_," where is situated the celebrated "_Logan Stone_." If we pursue our route along the cliffs, it will be found to lie several miles south-east of the Land's End, although by taking the direct and usual road across the country, it is not more than two miles distant; but the Geologist must walk, or ride along the coast on horseback, and we can assure him that he will be amply recompensed for his trouble. From the Cape on which the signal station is situated, the rock scenery is particularly magnificent, exhibiting an admirable specimen of the manner, and forms, into which Granite disintegrates. About forty yards from this Cape is the promontory called _Tol-Pedn-Penwith_, which in the Cornish language signifies the _holed headland in Penwith_. The name is derived from a singular chasm, known by the appellation of the _Funnel Rock_; it is a vast perpendicular excavation in the granite, resembling in figure an inverted cone, and has been evidently produced by the gradual decomposition of one of those vertical veins with which this part of the coast is so frequently intersected. By a circuitous route you may descend to the bottom of the cavern, into which the sea flows at high water. Here the Cornish Chough (_Corvus Graculus_) has built its nest for several years, a bird which is very common about the rocky parts of this coast, and may be distinguished by its red legs and bill, and the violaceous blackness of its feathers. This promontory forms the Western extremity of the Mount's Bay. The antiquary will discover in this spot the vestiges of one of the ancient "_Cliff Castles_," which were little else than stone walls, stretching across necks of land from cliff to cliff. The only geological phenomenon worthy of particular notice is a large and beautiful contemporaneous vein of _red Granite_ containing _Shorl_; is one foot in width, and may be seen for about forty feet in length. Continuing our route around the coast we at length arrive at "_Castle Treryn_." Its name is derived from the supposition of its having been the site of an ancient British fortress, of which there are still some obscure traces, although the wild and rugged appearance of the rocks indicate nothing like art. [Illustration]