Spiked gates.--Old King's.--=University Library=, Origin, Growth, Codex Bezae.--=Trinity Hall=, Colours, Library.--=Clare College=, "Poison Cup," Court, Bridge, Avenue.--The Backs, Sirdar Bonfire, College Gardens.--=Trinity College=, Michaelhouse, King's Hall, Henry the Eighth, Boat-clubs, Avenue, College Livings, Bridge, Library, Byron, Nevile's Court, Cloisters, Echo, "Freshman's Pillar," Prince Edward, Royal Ball, Goodhart, Buttery, College Plate, Grace-cup, Kitchen, Hall, Combination Room, Marquis of Granby, Tutors, Old Court, Fountain, Gate Towers, Clock, Lodge, Chapel, Newton, Organ, Bentley, Windows, Macaulay. On leaving King's Chapel we should give a glance to the marked line of demarcation between the whitish stone of which the lower courses are built and that employed in the upper.[21] It is of historical interest as showing how far the work had progressed before the long break caused by the Founder's death. Then, passing round the West Front, and noting the exquisitely delicate tracery of the canopies over the empty niches on either side of the door (wherein the two saints Mary and Nicolas to whom the building is dedicated were destined to stand) we leave the College by the iron gate on the North. [Footnote 21: The former is from Huddleston in Yorkshire, the latter from Weldon in Northamptonshire.] The formidable chevaux-de-frise which crown this gate are supposed at once to figure and to emphasise the danger run by such presumptuous students as dare to contemplate illicit exit from or entrance into the College during prohibited hours. It has already been said that between 10 p.m. and 7 a.m. no undergraduate resident in College may leave its precincts, and no outsider may enter, under divers pains and penalties. Every College supplements this moral pressure by more or less effectual and awe-inspiring physical barriers. None however are more fearsome to see, and less effective in fact, than these. For not only can the College be entered or left with comparative ease by way of the Backs, but even this ghastly array of spikes is not unscalable to those who know the trick of it. Tennyson, as will be remembered, has referred to this exploit in his "Princess."