The windows north and south of the retro-choir probably belong to this
period. The roll-moulding appears on the principal curves only of the
tracery; ever after it spreads over the whole of the tracery. The lower
lights of these windows are lancets; the circles in the head are cusped.
The chapels of St. Mary Magdalene and St. Gabriel, on either side of the
Lady chapel, seem also to have been remodelled at this time; for the side
windows of these two chapels have geometrical tracery earlier than that
of the Lady chapel.