It was an eventful day in the annals of the Corporation of the City of London, when Queen Victoria, on November 6, 1869, declared Blackfriars Bridge—about which more hereafter—and Holborn Valley Viaduct formally open. The Holborn Valley improvements, it should be remembered, were nothing short of the actual demolition and reconstruction of a whole district, formerly either squalid, over-blocked, and dilapidated in some parts, or over-steep and dangerous to traffic in others. But a short time ago that same Holborn Valley was one of the most heart-breaking impediments to horse-traffic in London. Imagine Holborn Hill sloping at a gradient of 1 in 18, while the opposite rising ground of Skinner Street—now happily done away—rose at about 1 in 20. Figure to yourself the fact, that everything on wheels, and every foot passenger entering the City by the Holborn route, had to descend 26 feet to the Valley of the Fleet, and then ascend a like number to Newgate, and you will at once see the grand utility of levelling up so objectionable a hollow. To attempt to give a stranger to London even a faint idea of what has been accomplished by Mr. Haywood’s engineering skill, by a necessarily brief description here, is an invidious task. Nevertheless, we must essay it; premising, by-the-by, that if our readers while in London do not go to see the Viaduct for themselves, our trouble will be three parte thrown away. The whole structure is cellular, to begin with. To strip the subject of crabbed technicalities, imagine for a moment a long succession of—let us call them—railway-like arches supporting the carriage-way: these large vaults being available for other purposes. Outside this carriage-way, and under the edge of the foot-paths on either side, is a subway, some 7 feet wide and 11 feet or so high. Against the walls of this sub-way are fixed, readily connectable, gas mains and water mains and telegraph tubes. This was the first time all these important pipes had been so cleverly arranged in one easily accessible place. They are ventilated and partially lighted through the pavement, and by gas. Under each sub-way goes a sewer, with a path beside it for the sewer men when at work. Outside the sub-way are ordinary house vaults of two or three storeys high, according to the height of the Viaduct. These are divided by transverse walls; and, when houses are built against it, the Holborn Valley Viaduct will be shut out from sight, except in the case of the simple iron girder bridge over Shoe Lane, and the London, Chatham, and Dover bridge, with its sub-ways for gas and water pipes, and the fine bridge over Farringdon Street. You will, we trust, now see how marvellously every yard of space has been utilized by the engineer, from the roadway down to the very foundations. A few words must now be said about the splendid bridge over Farringdon Street. This has public staircases running up inside handsome stone buildings—the upper parts of