The new library building, which forms the north side of the third court, was built in 1624. It is reached by a staircase built in the north-west corner of the second court. The windows of the library are pointed and filled with fairly good geometrical tracery, while the level of the floor and the top of the wall are marked by classical entablatures. The wall is finished by a good parapet, which originally had on each battlement three little pinnacles like those still remaining on the parapet of the oriel window in the west gable. This gable stands above the river, and forms with the adjoining buildings a most picturesque group. The name of Bishop Williams of Lincoln, Lord Keeper of the Great Seal, who had contributed as "an unknown person" two-thirds of the entire cost of £3000, is commemorated by the letters I.L.C.S. (_i.e._ _Johannes Lincolniensis Custos Sigilli_), together with the date 1624, which appear conspicuously over the central gable. His arms, richly emblazoned, were suspended over the library door, and his portrait, painted by Gilbert Jackson, adorns the wall. The original library bookcases remain, though their forms have been considerably altered. The west range of the second court and the new library formed two sides of the third court. The remaining river range and the buildings on the south adjoining the back lane were added about fifty years later. They were probably designed by Nicholas Hawkes, then a pupil of Sir Christopher Wren. The central composition of the western range was designed as an approach to a footbridge leading to the College walks across the river. This footbridge gave way to the covered new bridge, commonly spoken of as the Bridge of Sighs from its superficial resemblance to the so-called structure at Venice, leading to the fourth court, which was completed in 1831 from the plans of Rickman and Hutchinson. The old bridge, leading from the back lane, was built in 1696. Beyond the new court are the extensive gardens, on the western side of which is "the wilderness," commemorated by Wordsworth, who was an undergraduate of John's from 1787 to 1791, in the well-known lines of his Prelude:--