Bridges.—The communication between the northern and southern sections of the metropolis is maintained by means of various bridges. Excluding _Albert Suspension Bridge_, (between Cadogan Pier, Chelsea, and Albert Road, leading into Battersea Park,) commenced in 1865, and not yet open, the number is 14—as follow: 1. _London Bridge_, built by Rennie, and opened in 1831; it is 928 feet long, and 54 wide; it has 5 arches, of which the centre is 152 feet span, and cost, with the approaches, £2,000,000. This is regarded as one of the finest granite bridges in the world. 2. _South-Eastern Railway Bridge_, to connect the London Bridge Station with a new terminus in Cannon Street; this bridge, having five lines of railway, is midway between London Bridge and the one next to be named. 3. _Southwark Bridge_, by Rennie, was opened in 1819; it is of iron, 708 feet long, with three magnificent arches, the centre one of 402 feet span; it was a toll bridge, and cost £800,000. In 1865, it was made free, and remains so, by arrangement between the Company and the Corporation. 4. _Blackfriars Railway Bridge_, with four lines of rail, connects the Metropolitan Railway north of the Thames with the Chatham and Dover Railway on the south. [Picture: Blackfriars Bridge] 5. _Old Blackfriars Bridge_, by Mylne, was opened in 1769; it consisted of 19 arches, and was 995 feet long. The foundations, however, having become decayed, the bridge was pulled down, and a magnificent new one, by Mr. Cubitt, built its place. A wooden bridge of remarkable construction, with a foot-way _over_ the carriage-way, did duty for traffic till the opening of Mr. Cubitt’s present structure. This was formally done by the Queen in person, November 6, 1869. The entire width of the new bridge is 75 feet, the foot-paths being 15 feet each, with a fine road between them, 45 feet in breadth from kerb to kerb. The entire length of the bridge, including approaches, is 1,272 feet, and its centre arch has a span of 185 feet in the clear. It has four piers. All its iron (except the ornamental portion, which is of cast metal) is hammered. With its handsome polished red granite piers, Portland stone capitals, and florid Venetian Gothic ornamentation, light-looking yet massive iron arches, spandrils, and parapets, and its general _tout ensemble_, new Blackfriars is, bearing all things in mind, one of the cheapest permanent bridges thrown across the Thames. Its total cost is under £400,000. 6. _Waterloo Bridge_, one of the most magnificent in the world, was built by Rennie, and was opened in 1817; it is flat from end to end, 1,380 feet long, or 2,456 with the approaches; it consists of nine beautiful arches of 120 feet span, and cost £1,000,000; a toll of one halfpenny per passenger yields a very poor return on this outlay. 7. _Hungerford Suspension Bridge_ has been replaced by a fine new bridge, partly for foot-passengers, and partly for the Charing Cross extension of the