We now come to one of the most important series in the collection, and one in which the greatness and importance of this country is most emphatically illustrated. These are the Metals, properly so called. The arrangement adopted with these is first to show the ores from each district, next the mode of smelting those ores, the metal procured, and generally the manufacture of the metal. The Iron, of course, assumes the first importance. The Pig Iron is the first state in which the metal is obtained; it is then submitted to the refining and “puddling” processes; then rolled into bars, nails, and plates, or drawn into wire; we then see it converted into steel, by various processes including Bessemer’s, and this leads us to the manufactures of Sheffield. The series, of course, includes Copper, Zinc, Tin, Antimony, Gold, Silver, &c. The central stands at this end of the gallery are occupied with a collection of the coals and building stones of England and Scotland, with a set of maps indicating the geological formation from which each is obtained. The cases down the centre of the gallery are devoted to the Vegetable Kingdom. These are arranged as follows:--Products used as food, in the arts, and in manufactures, and in medicine. In the first class is a collection of British agricultural produce, made by Messrs. Peter Lawson & Son, of Edinburgh. The Cereals and Grasses will be found arranged in the upright cases, facing the garden and on the octagonal tables. In the cases beneath are the Roots and Fruits modelled in wax. The various growths and manufactures of Tobacco, of Hops, Spices, and aromatic Seeds, as well as Cocoa, Teas, Coffee, and their substitutes, and the articles used as food, should be specially noticed, being most completely illustrated. It will be noticed here, and also with most of the vegetable specimens in this collection, that reference is made upon the explanatory cards, which are in all cases affixed to specimens, to the fact that growing trees and plants of the various kinds may be found in the beds downstairs; and this will be found specially alluded to where the Botanical collection is described; it should be carefully borne in mind, and will, on being followed by inspection, yield an ample repayment of interest. We should now return down the side of the cases and commence our inspection of the other side, proceeding from the south end. We shall find the first set of cases illustrating the materia medica. The upper parts contain the plants, while in the lower divisions the drugs, seeds, and applied parts are shown. Next come the cork and other manufactures, including paper and paper-staining, those of Fats and Oils, India Rubber and Gutta Percha, with their various applications, Resins, Dyes and Dye-woods, these being further illustrated as with the materia medica by the plants from which they are procured. The illustrations of the Cotton, Flax, Hemp, the Pine Apple,