The multiplicity of the printing processes, and their complexity, call for many distinct buildings. Hence, when large, and isolated away in the country, as very generally happens, a print-works has quite the look of a rising village. There is a laboratory, with library, for the managing chemist, a suite of apartments for the designers, and a house and fruitful garden for the resident partner, with, in addition, not uncommonly, a schoolroom for the children. When the designers have completed their sketches, the engraver's work begins--a business in itself, and carried on almost exclusively in town, and especially in Manchester. Originally the pattern was cut upon a block of wood, usually sycamore, the success of the transfer to the cloth depending chiefly upon the dexterity of the workman. In 1785 this very primitive mode was superseded by "cylinder-printing," the pattern being engraved upon copper rollers, as many as there are colours; and though "block-printing" shares the unquenchable vitality of hand-loom weaving, the roller may now be considered universal. The employment of copper supplies another very interesting illustration of the resort made to this metal in almost every kind of high decorative art, and prepares us to understand the fitness of the ancient mythological use, and why associated with the goddess of love and beauty. These great undertakings--the bleaching, the dyeing, and the printing of the calico--demand steady supplies of the chemicals and other agents by means of which the various objects are attained. Hence in Lancashire the unrivalled number and extent of the manufacturing chemical works; and, especially in Manchester, the business,--never heard of in many English counties, here locally distinguished as the "drysalter's." The drysalter sees to the importation from foreign countries of the indigo, the madder, and other dye-stuffs in daily request; he deals also in the manifold kinds of gum constantly asked for, supplying himself partly from abroad, _viâ_ Liverpool, partly from works close by which prepare it artificially. A well-known sight in Manchester is that of a cartload of logs of some curious tropical dyewood, rudely hewn by the axe, and still retaining in the cavities of the bark little relics of the mosses and lichens of their native forest.