Jackson, Thomas Graham, Sir, 1835-1924 · Cambridge : University Press · leaf 239
CH. xi] RAVENNA, GOTHIC PERIOD 167 wood, but the north aisle is vaulted and has chapelsbetween buttresses, a construction designed to supportthe nave arcades which were leaning outwards. In the mosaics at this church we see the Christian Deveiop-hagiology thoroughly organized. The nimbus was…