The church which was thus so long profaned is of late Perpendicular architecture. Huge galleries have been inserted for the accommodation of such undergraduates as may attend; the nave being appropriated to the Master of Arts. During the seventeenth and eighteenth centuries the east end was filled with tier above tier of semicircular benches for the seniors of the University, from whose prevailingly bald heads this elevation became profanely known as "Golgotha." All is now arranged in decent fashion, and since the building of the Senate House the church has only been used for strictly ecclesiastical purposes. Here each Sunday afternoon is preached the "University Sermon," the preacher being some clergyman selected by the Council of the Senate. No service is held in connection with this sermon, but the preacher, before commencing, reads from the pulpit what is known as the "Bidding Prayer"--a long list of subjects for intercession, comprising the various authorities in Church and State, the Clergy, and (as the source of their supply) the Universities and Colleges. Amongst these "as in private duty bound" the preacher specifically names the College to which he himself belongs, finally concluding with the Lord's Prayer.[83] The sermon is officially attended by the Vice-Chancellor and Proctors, who gather in the Senate House and cross the street in procession to the West door of the church. One of the Proctors carries the University Bible, a ponderous tome suspended by a chain; and in front is borne the silver mace of the University, by an official designated the "Esquire Bedell." [Footnote 83: On the Sunday after All Saints' Day, when the "Lady Margaret Preacher," appointed by the Vice-Chancellor, officiates, he begins by reading the long roll of benefactors to the University from the earliest times; in itself a specially inspiring predication.] The church has witnessed various vicissitudes of doctrine. Here, during the first outbreak of Protestantism, the Missal was solemnly torn up and burnt amid the hooting of the crowd; and when, a century later, the Puritans gained the ascendancy, a like fate befell the Book of Common Prayer, Cromwell himself presiding at the ceremony. This was on Good Friday, 1643, when the Vice-Chancellor and several other Heads of Colleges were, for refusing to abet the proceeding, shut up in the church "all the long cold night, without fire or candle." They were afterwards haled to London, and, after being pelted through the City, were subjected to a sort of Black Hole treatment, under hatches on board a hulk in the river, with all port-holes closed, and no air "save such as they could suck from each others' breaths," as the "Querela Cantabrigiensis" piteously complains.