In St. Martin’s le Grand. The front of this fine building is 380 feet long, and is ornamented with three Ionic porticos. The post-office is one of the most busy spots in London, and is the most perfect system of commercial convenience which has ever been formed under any government. It receives letters from all parts of our own country, as well as from every civilized nation in the world, and forwards them to their destination with the utmost regularity. In front of the central portico, I see, there is one of the mail-coaches for the conveyance of letters. These coaches travel at the rate of eight miles an hour, including stoppages: they carry also passengers and parcels. 65. Southwark Bridge. [Picture: Southwark Bridge] This grand fabric was constructed of cast-iron, under the direction of John Rennie, Esq. It consists of three immense arches. The centre arch spans 240 feet, and the two others 210 feet each. The weight of iron is more than 5308 tons. The abutments are of stone. The bridge forms a communication from the bottom of Queen Street, to Bankside, Southwark. It was begun in September, 1814, and was completed, and opened for public use, in March, 1819. The entire expense incurred by the building of this bridge was £80,000. 66. Waterloo Bridge [Picture: Waterloo Bridge] Is built of a very hard kind of stone called granite. This bridge was commenced in 1811, and completed in 1817. The road-way of the bridge is level, which is very favourable to the draught of carriages. It has nine fine arches, 120 feet span. The piers are twenty feet thick, ornamented with Tuscan columns. This building was constructed under the superintendence of the late John Rennie, Esq. The opening of this bridge to the public was conducted with unusual grandeur, on the 18th of June, 1817; being the anniversary of the battle of Waterloo, his late Majesty, then Prince Regent, and the Duke of Wellington, with grand military cavalcade, attending. Near the foot of Waterloo Bridge, in the Strand, stands 67. The Royal Academy, Somerset House. [Picture: The Royal Academy] This academy of fine arts was established by royal charter in 1768. The academy consists of forty academicians, twenty associates, and six associate engravers. Sir Joshua Reynolds was the first president. They make a grand annual exhibition of paintings, sculptures, &c. which commences in May, and generally continues open about six weeks. 68. Covent Garden. [Picture: Covent Garden]