"6. Some striking feature to exemplify the present state of the science of construction in this country. "The first of these, ECONOMY, is attained by doing away with any internal walls (all divisions being made by the necessary stalls), by reducing the whole construction, with the exception of the dome, to cast iron columns, supporting the lightest form of iron roof in long unbroken lines, and by the whole of the work being done in the simplest manner, and adapted in all respects to serve hereafter for other purposes. "The second, facilities for the RECEPTION, CLASSIFICATION, and DISPLAY of goods. The main central entrance for the reception of objects for exhibition will probably be that most approachable from the public road. All cases accompanying goods will be examined, registered, catalogued, &c., in the offices of the Executive; the packing-cases will then be put upon a truck running on a line of rails laid down temporarily, and conveyed to the centre turn-table, from which they may be carried by a line of rails at right angles to the first, to the end of the transverse gallery, in which they may be destined to be placed. "The most important condition to insure successful _classification_ is, that those to whom the duty of arrangement may be confided should be hampered by no fixed limits of space, such as would have been the case had the building been divided into a number of halls, sections, or chambers. The plan submitted fulfils this condition perfectly; as objects can be arranged just as they are received, and moved, if necessary, from gallery to gallery with great facility. "The successful display of the goods would be best insured by leaving, under certain general restrictions, the fitting up of each stall to the Exhibitor or his Agent, floor-space only being allotted to each; and stands, frames, brackets, shelves, &c., being put up by a contractor's carpenter, at a fixed tariff. "The best light is provided, and the most economical wall-space is proposed to be furnished by connecting pillar to pillar transversely, on the extreme north and south sides of the building, by rods, from which draperies, &c., can be suspended.