Passing the large exhibit of machines for the working of fibres preliminary to the loom--the carding, roving, spinning, reeling and warping--and the allied but different machines which make wire-cloths of different meshes and size, we come to the ropemaking-machines for hemp and wire, which are shown principally in their products, the manufacture taking an amount of room and material which could hardly be expected to be efficiently shown in a crowded building where space is valuable. The French plant for boring small shafts to find water or obtain sections of the strata, and the larger ones for sinking large ones for mines, are shown by several exhibitors. The annular drills remove cylindrical sections of the strata from ten to sixty centimetres in diameter: the large chisels resemble those described in the Belgian exhibit, having a diameter of four metres and a weight of twenty-five thousand kilos. The department of mining has some excellent large models of mining districts, in which the face of the country is represented with the natural undulations, the villages, roads, fields and streams, and made in removal-sections which expose the underlying strata, the galleries, drifts and shafts of the subterranean world. An attempt to describe the steam-engines, of such various size, shape, position and capacity, would exhaust all the space permissible in a magazine article. The wood-working tools of France are excellent, and our manufacturers must look well to their laurels. We have as yet the advantage in compactness and simplicity, with adjustability and adaptation to varying classes of work. The band-saw is claimed as a French invention, and the crowds around the workman who saws a roomful of dolls' furniture out of a single block as large as one's fist are as great here as they were at Philadelphia. The Blanchard lathe for turning irregular forms is here in a variety of forms. This is an interesting object of study, as illustrating the usual course of invention, in which a master-hand grasps a subject which has been suggested in an incomplete and comparatively ineffective manner from time to time by others. De la Hire and Condamine during the last century described lathes adapted to turn irregular shapes, and the scoring-machine for ships' blocks invented by Brunel and made by Maudslay for Chatham dockyard in England, 1802-8, was as perfect an exemplification of the idea as the nature of the work to be done required. Blanchard, however, in 1819 gave the finishing stroke, and the lathe will bear his name for long years. Inventors of three nations attacked the problem, and each aided the result.