and coaches, the passage being but narrow, and not only troublesome but dangerous. These three vacancies are over three of the middle arches, for all the piers are not of a like thickness, nor stand at equal distance one from the other; for under those three vacancies are much wider than the rest, and are called the navigable locks, because vessels of considerable burthen may pass through them. One of these is near unto the second gate, and is called the Rock Lock. The second is under the second vacancy, and is called the _Draw-Bridge Lock_. And the third is near the Chapel, and is called _St. Mary’s Lock_. There is a fourth between St. Magnus’ Church and the first vacancy, and is called the _King’s Lock_, for that the King in his passage through Bridge, in his barge, goes through this lock.’ In Strype’s additions to these particulars, which I have already referred to, he says, ‘The two Arches next London are now stopped up for the use of the Water-mills, but without any prejudice to the current of the Thames. The third arch on the Southwark side is seldom, and very rarely, passed through, because of a rock grown there a little to the East, which is visible at low water. This rock hath been observed this many a year, and is called the _Rock Lock_. The reparation of these arches, and the striking down piles for securing them, is continual, and men are kept on purpose to take care of it, and to do it. Whereof they have two Master-workmen, _viz._ a Head-Carpenter,’--whose name in Strype’s time was Wise,--‘and a Head-Mason, whose office it is to look after the Bridge under the Bridge-Masters.’ The common report of the rock growing beneath the water, under one of the Arches of London Bridge, is, however, one of those popular traditions which are generally to be found connected with almost every edifice, engendered partly by ignorance, and partly by the desire mentioned by the Indian in Robinson Crusoe, ‘To make the great wonder look!’ ‘We have been assured,’ says the Rev. John Motley, in ‘_Seymour’s Survey of London_,’ volume i. page 48, ‘by a person of great veracity as well as curiosity, that a friend of his in the year 1715, when the tide was so kept back that many people walked over the river, went near enough to examine this, and found it to be stones joined together with cement, and iron in some places; and therefore supposed it was part of an arch that had formerly been broken down, and never since removed,’ It has been generally believed, that these ruins were the fragments of the two arches, and the Bridge-gate, which, as I have related to you, fell down in the year 1437: and which, having now lain nearly four centuries, and been increased by the deposits which millions of tides have cast upon them, have become almost as impenetrable as a solid rock, and the arch, therefore, retains its ancient name. Such was London Bridge after it was rebuilt, ‘peopled’--as Evelyn says of the City, but a very few days after the