Hearing this, we get up to look at the rock above us. We are able to stand upright in the position we now occupy; and flaring our candles hither and thither in the darkness, can see the bright pure copper streaking the dark ceiling of the gallery in every direction. Lumps of ooze, of the most lustrous green color, traversed by a natural network of thin red veins of iron, appear here and there in large irregular patches, over which water is dripping slowly and incessantly in certain places. This is the salt water percolating through invisible crannies in the rock. On stormy days it spirts out furiously in thin, continuous streams. Just over our heads we observe a wooden plug of the thickness of a man's leg; there is a hole here, and the plug is all that we have to keep out the sea. Immense wealth of metal is contained in the roof of this gallery, throughout its whole length; but it remains, and will always remain, untouched; the miners dare not take it, for it is part, and a great part, of the rock which forms their only protection against the sea; and which has been so far worked away here, that its thickness is limited to an average of three feet only between the water and the gallery in which we now stand. No one knows what might be the consequence of another day's labor with the pickax on any part of it. This information is rather startling when communicated at a depth of four hundred and twenty feet under ground. We should decidedly have preferred to receive it in the counting-house! It makes us pause for an instant, to the miner's infinite amusement, in the very act of knocking away about an inch of ore from the rock, as a memento of Botallack. Having, however, ventured, on reflection, to assume the responsibility of weakening our defense against the sea by the length and breadth of an inch, we secure our piece of copper, and next proceed to discuss the propriety of descending two hundred and forty feet more of ladders, for the sake of visiting that part of the mine where the men are at work. Two or three causes concur to make us doubt the wisdom of going lower. There is a hot, moist, sickly vapor floating about us, which becomes more oppressive every moment; we are already perspiring at every pore, as we were told we should, and our hands, faces, jackets, and trowsers, are all more or less covered with a mixture of mud, tallow, and iron-drippings, which we can feel and smell much more accurately than is exactly desirable. We ask the miner what there is to see lower down. He replies, nothing but men breaking ore with pickaxes; the galleries of the mine are alike, however deep they may go: when you have seen one, you have seen all. The answer decides us--we determine to get back to the surface.