Canning Dock, with the Custom-house, forms one of the finest points of view in Liverpool, presenting at one view a building of elegant design and execution, and a forest of masts which sufficiently indicate the bustle of trade, and the air of business that pervade every feature of the place--animate or inanimate. Canning Dock--so distinguished in honour of Mr. Canning, a name happily identified with Liverpool and the prosperity of its trade,--covers a space of five hundred yards in length. On the west side it communicates with three graving docks, where vessels are laid up for repairs, and is chiefly occupied by vessels trading to the northern coast. It is the first of the seven docks extending southward, and is generally filled by vessels in the act of discharging or taking in their cargoes. It presents a scene of great bustle and activity, and, though only one out of many, affords the stranger a very clear idea of the vast amount of traffic that is daily shipped or entered at this emporium. The Custom-House is of recent date, and replaced the old official buildings, which were found quite inadequate to the purposes of a daily extending commerce. Through the united interest of Canning and Huskisson, negociations were entered into with Government as to the necessity of a new Custom-house; and after a short time arrangements were concluded for its immediate erection. Mr. Foster, architect to the Liverpool corporation, was engaged to prepare the designs, and made choice of the present site as the most appropriate for a commercial building of this size and character. The lower apartments of the Custom-house consist of spacious vaults for the safe custody of bonded and other goods; and in the centre is the apartment known as the Long Room. The offices of customs occupy the whole extent of the west wing; and it is intended that part of the east wing shall be appropriated to the use of the general post-office. Above these are the excise offices and those of the dock-treasurer and secretaries. The remaining portions of the edifice are subdivided into the board-room, the dock-committee's offices, and the stamp-office.