R. J. King, The Three Choirs: A Handbook to the Cathedrals of Gloucester…
“ The northern bay is precisely similar to the choir in the arrangement and design of its lower arches (opening to the aisles east and west) , the triforium, and clerestory. The southern bay has its three sides pierced with two tiers of triple lancet windows set back in the wall, with a passage through the jambs. The inner arches are supported by clustered shafts of Purbeck marble, ringed. An arcade, with sculptures in the spandrils, runs below the windows. The vaulting is quadripartite, with bosses of leafage, of unusual beauty, at the intersections. ”
