The central arch on the western side of the Court has some prominence, and was probably intended from the first as the approach to a bridge. Towards the end of the seventeenth century Sir Christopher Wren was consulted on the subject, and a letter from him to the then Master, Dr. Gower, has been preserved. Sir Christopher's proposal was a curious one: he suggested that the course of the river Cam should be diverted and carried in a straight line from the point where it bends near the Library of Trinity College. A new channel was to be dug, and a bridge built over this; the water was then to be sent down the new channel, and the old one filled up. He pointed out that this would give "a parterre to the river, a better access to the walks, and a more beautiful disposal of the whole ground." This scheme was, however, not carried out, but a stone bridge was built outside the range of the buildings on the site of an old wooden bridge, which then gave access to the grounds. This is the bridge which still exists; it was built, apparently from Wren's designs, under the superintendence of his pupil, Nicholas Hawksmoor. More than a century now passed before further building operations were undertaken. In 1825 the College employed Mr. Thomas Rickman and his partner, Mr. H. Hutchinson, to prepare designs for a new Court, with from 100 to 120 sets of rooms. This work was started in 1827, and completed in 1831. The covered bridge connecting the old and new parts of the College was designed by Mr. Hutchinson; it is popularly known as the "Bridge of Sighs." The style of this Court is Perpendicular Gothic. The site was unsuited for building operations, consisting mostly of washed and peaty soil; it had been known for generations as "the fishponds close." The modern concrete foundations were then unknown, and the plan adopted was to remove the peaty soil and to lay timber on the underlying gravel. On this an enormous mass of brickwork, forming vaulted cellars, was placed; this rises above the river level, and the rooms are perfectly dry. The total cost of the building was L78,000, most of which was provided by borrowing. The repayment, extending over a number of years, involved considerable self-denial on the Fellows of the College, their incomes being materially reduced for many years. Crossing the covered bridge and passing down the cloisters of the New Court, we enter the grounds by the centre gate; these extend right and left, being bounded on the east by the Cam, and separated from the grounds of Trinity by a ditch. From the old, or Wren's, bridge over the Cam two parallel walks extend along the front of the Court; according to tradition the broader and higher was reserved for members of the College, the lower for College servants. At one time an avenue of trees extended from the bridge to the back gate, but the ravages of time have removed all but a few trees.