In bringing this topographical essay to a conclusion, it may be desirable to note a few observations on the materials we possess for making a map of early London, the reconstruction of which, with considerable fulness and accuracy, is possible. We have in the Survey of Leeke, made directly after the great fire, and engraved on two sheets by Vertue from a parchment original, now in the MS. room of the British Museum (5415. E.I.), an admirable starting-point. Even the widths of the streets are figured on this plan, and the forms of St. Paul's and the other old churches are given with fair precision. It is entitled "An Exact Survey of the Streets, Lanes, and Churches, comprehended within the Ruins of the City of London; first described in six platts in December, Anno Domini, 1666. By John Leeke.... And here reduced into one entire platt by John Leeke." This parchment was engraved by Hollar to a smaller scale, with the unburnt portions of the city added in isometrical projection. On this plan the ward boundaries are carefully laid down. As to the ground-plan of the portions left uninjured by the fire, we can supplement Leeke's Survey by the plan Wren made for reconstructing the city, now at Oxford, which shows the streets and churches of the uninjured areas; and from Ogilvie's large map, made only a few years later, details, such as the block-plans of the churches in the unburnt part, can be filled in with greater accuracy. From Faithorne's map, 1658, some additional facts, especially as to Southwark and the suburbs, can be obtained, as it is of large extent.[221] Putting all these together, we have an exact map of London as it existed at the moment of the fire. Afterwards a few modifications were made in the streets, but the plan of old London remained practically unchanged till Southwark Bridge was built and Queen Street made to lead to it.