Eight steam-engines of the largest size, and thirty of smaller dimensions, are employed for drainage and other purposes, their ordinary working power being equal to 4000 horses, but when their full power is put on they almost equal that of 8000. To carry off the water from these mines, a tunnel, with numerous ramifications has been formed, measuring nearly thirty miles in length. One branch of this tunnel is upwards of five miles long, carried underground 400 feet beneath the surface, finding its outlet into the sea near Falmouth. A few years ago the number of tin mines worked in Cornwall amounted to 139, and to 26 in Devonshire; and about 20,000 persons were employed in them. Although the wages of the miners are much inferior to those of the pitmen in the northern coal-fields, yet they have advantages over their brethren, being exempted from many of the evils to which the northern miners are subjected. They have no fear of the fatal fire-damp or sudden explosions. Intellectually they are also superior, as they are mostly engaged in work requiring the exercise of mind. Their wages arise from contract, and depend greatly upon their skill and energy. They mostly have gardens, which they cultivate, and when near the coast they engage in the fisheries, thus increasing their incomes and varying their mode of life. After leaving Redruth the travellers proceeded over the wildest and most desolate of moorlands, with blocks of stone scattered about, towards the wonderful Botallack Mine, on the Cornish coast. No mine in the world is so singularly placed. Descending to the shore below, on looking upwards, the view appeared fearfully grand. In one part was a powerful steam-engine, which had to be lowered almost 200 feet down the cliffs. Here tall chimneys, pouring out dense volumes of smoke, were seen perched on the ledges of a tremendous precipice. Here and there also were the huts of the miners, disputing the ground with the wild sea-birds, while ladders of great length scaled the rocks in all directions, enabling them to ascend and descend to their work. In some parts were paths up which sure-footed mules, with riders on their backs, were trotting briskly along, where few people unaccustomed to dizzy heights would have wished to venture even on foot. As they had determined to visit the mine, they had to ascend to the top of the cliff and then once more to descend among the rugged rocks to a ledge about midway between the summit and the ocean, where a small building, occupied by the mining agent, marked the entrance. Hearing who they were, the agent at once undertook to guide them, and produced a couple of woollen mining dresses and two large felt hats.