which is on the same suite of lodes as _Dolcoath_, but separated by a cross-course which forms a natural boundary to both. This cross-course has so _heaved_ the lodes, that many which are worked with great profit in the former mine cannot be discovered in the latter, notwithstanding the laborious search which has been made for that purpose. The picturesque effect of this scenery is not a little heightened by the bold elevation of _Carn-breh Hill_, which, crowned with the mouldering remains of past ages, rises, as if in mockery of the boasted prowess of art, and forms a most striking and impressive contrast to the active scene before us. REDRUTH is a very populous town of high antiquity, situated in the bosom of the mining district, and capable of affording very excellent accommodation to the mineralogist who may be desirous of remaining some days for the purpose of inspecting, at his leisure, the numerous mines by which it is surrounded. The general level of this metalliferous district is from 350 to 450 feet above the sea; and being frequently intersected by vallies, great opportunities are presented for the advantageous construction of _Adits_. We next proceed to visit the great Steam-Engine of Chacewater mine, situated three miles south of Redruth. It was erected about the year 1813, and was at that period the most powerful machine in the world. It is a double engine upon the improved principle of Bolton and Watt, and the style and elegance with which its different parts are finished, reflect no inconsiderable credit upon the engineer. The following are its dimensions; the cylinder is 66 inches, the box 19, in diameter. The depth of the engine shaft is 128 fathoms. From the _Adit_ to the bottom 90 fathoms. It makes eight strokes in a minute, and at every stroke it raises 108 gallons of water to the _Adit_;[112] and, at the same time also, 60 gallons, 10 fathoms high, for the purpose of condensing the steam. The quantity of coals consumed in twenty-four hours is estimated at about eight chaldrons. To give at once a popular idea of its immense power, it may be stated that, if it were applied as a mill, it could grind a Winchester bushel of wheat every minute. Notwithstanding the immensity of its force, and complexity of parts, so completely is it under the discretion and guidance of the engineer, that in one instant he is able to stop its motions by the mere application of his finger and thumb to a screw.--"We put a hook in the nose of the Leviathian;--play with him as a child, and take him as a servant for ever."