You ascend a slope, by a path of mud and slush, and arriving at another larger open space, you find yourself in front of a sheet of water, and in the distance you observe one enormous wheel--the diabolical queen of all the rest--standing, black and immovable, like an antediluvian skeleton, against the dull, gray sky, with a torrent of water running in a long narrow gully from beneath its lower spokes, as if disgorged before its death. This open space is surrounded by trees, above which, high over all, there rises a huge chimney, or rather tower; and again, over all this there float clouds of black smoke, derived from charred wood, if we may judge of the effect upon our noses and eyes. At distances from each other, varying from thirty or forty to a hundred and fifty yards, over this settlement are distributed, by systematic arrangement of the intervals, and the obstructive character of the intervening ground and plantations, no less than ninety-seven different buildings. By these means, not only is the danger divided, but the loss, by an explosion, reduced to the one "house" in which the accident occurs. Such, at least, is the intention, though certainly not always affording the desired protection. The houses are also, for the most part, constructed of light materials, where the nature of the operation will admit of it; sometimes extremely strong below, but very light above, like a man in armor with a straw hat; so that if a "puff" comes, there will be a free way upward, and they hope to get rid of the fury with no greater loss than a light roof. In some cases the roofs are of concrete, and bomb-proof; in others, the roofs are floated with water in shallow tanks. There are five steam-engines employed, one being a locomotive; and the extraordinary number of twenty-six water-mills, as motive powers for machinery--obviously much safer than any other that could be obtained from the most guarded and covered-in engines requiring furnaces.