We enter the precincts of this great College by "that long walk of limes," up which Tennyson passed, as he tells us in "In Memoriam," when he re-visited Cambridge, "to view the rooms" once inhabited by his friend and hero, Arthur Hallam.[27] This avenue was planted in 1672,[28] and leads us to the fine cycloidal[29] bridge, built at the same period. After crossing this, we should not keep straight, which would bring us into the "New Court" where Hallam dwelt (a poor bit of architecture erected 1825), but rather turn to the left, by the path that sweeps along the bank of the river, with its fine weeping willows. Looking back, as we leave the bridge behind us, we may admire the climbing agility which frequently enables undergraduates to descend to the projecting piers just above the water, and find their way back again, without a ducking. [Footnote 27: Hallam's rooms were on the southern side of the New Court, in the central staircase (letter G), and were the western set on the first floor. Tennyson himself never "kept" in College, but had lodgings, first in Rose Crescent, and afterwards opposite the Bull Hotel.] [Footnote 28: Its line was determined by the distant spire of Coton Church which for two centuries closed the vista. (It is now hidden by these trees.) A current witticism was that the view symbolised a Trinity Fellowship--a long, straight-forward prospect, closed by a village church. Till the year 1878 every Fellow had to become a Priest of the Established Church within seven years, on pain of forfeiting his Fellowship. After this he was a Fellow for life, unless he married. And each Fellow in turn had a right to any College living that fell vacant. All this is altered now. Fellows are elected unconditionally for a limited period (which may be renewed), and College livings are assigned to the best men to be had, whether of Trinity or not.] [Footnote 29: A cycloid is the curve described by any single point on the rim of a rolling wheel.] We have here in front of us the New Court of St. John's College, seen across its lawn-tennis grounds; while to our left is the magnificent range of horse-chestnuts along the boundary of the two Colleges. Splendid at all times, these are seen at their very best when duly touched by frost. To our right rises the fine mass of Trinity Library, built by Sir Christopher Wren in 1675; whose walls of warm-coloured stone have been already dwelt upon. The lower portion of the building forms an open cloister, with grated windows and gates barring it from the Backs where we stand.