From Chacewater we proceed southward about two miles to visit the extensive Copper mines, called "_The Consolidated Mines_," the working of which has been lately resumed. Here we shall find two immense Steam Engines, with cylinders of 90 inches in diameter, constantly at work; the interior of which is kept as clean as a drawing-room. The capital expended in setting these mines at work was not less than £65,000, and under the arrangement of Mr. William Davey, the concern has proved so profitable, that shares are now selling in London at £100 per cent. profit. Near the _Consolidated Mines_ are _Huel Unity_ and _Poldice_; the former is a Copper mine; the latter produces both Copper and Tin. The most beautiful specimens of _Arseniate of Copper_, and _Arseniate of Lead_ have been found in these mines. Having concluded our account of the mining district, it remains for us to offer to the mineralogical tourist a few observations upon the subject of Cornish Minerals, and upon the best method of procuring them; before the stranger, however, attempts to purchase any specimens, it will be well for him to inspect the several splendid cabinets in the county; besides that in the museum of the Royal Geological Society, at Penzance, he should see those in the possession of William Rashleigh, Esq. M. P. of _Menabilly_;[113] John Williams, Esq. of _Scorrier House_, and Joseph Carne, Esq. of _Penzance_. The one in possession of Mr. Rashleigh, if not the most accessible to the mineralogist, must be confessed to be without comparison, the most splendid. Its chief excellence consists in the magnificence and variety of the _Oxide of Tin_,[114] _Fluors_, _Malachite_, and some of the rarer varieties of _Sulphuret of Copper_, from mines which have long since ceased to be worked. Among the more remarkable specimens are those of _Oxide of Tin_ (from Saint Agnes) some of the more interesting varieties of which present the following forms,--very large octohedrons with, and without, truncations;--the crystal described by Klaproth as one of the rarest occurrence, _viz._--the four-sided prism, with a four-sided pyramid at each extremity; this is to be seen in its simple form, and also with a rich variety of truncations;--a group of four-sided pyramids covered with a thin coating of _Calcedony_, which, being _hydrophanous_, shews the form of the crystal very distinctly after immersion in water; _Wood-tin_ forming a vein in a matrix of quartz, to one side of which adheres a fragment of rock; it is hardly necessary to remind the mineralogist of the importance of this specimen in a geognostic point of view;[115] Tin crystals having a coating of black _hæmatite_; _Sulphuret of Tin_, a mineral which has never been found in any part of the world except at _Huel Rock_, in Saint Agnes, _Stenna-gwyn_, in Saint Stephen's, and _Huel Scorrier_ in Gwennap.[116] In the collection of Tins may be seen several small blocks[117] of that